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synthetic_turbulence_generator_mod.f90 @ 4879

Last change on this file since 4879 was 4851, checked in by gronemeier, 4 years ago
bugfix: deactivated header output (dynamics_mod); change: formatting clean-up (synthetic_turbulence_generator_mod)
Property svn:keywords set to `Id`
File size: 113.0 KB

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[2259]	1	!> @synthetic_turbulence_generator_mod.f90
[4559]	2	!--------------------------------------------------------------------------------------------------!
[2696]	3	! This file is part of the PALM model system.
[2259]	4	!
[4559]	5	! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General
	6	! Public License as published by the Free Software Foundation, either version 3 of the License, or
	7	! (at your option) any later version.
[2259]	8	!
[4559]	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
	10	! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
	11	! Public License for more details.
[2259]	12	!
[4559]	13	! You should have received a copy of the GNU General Public License along with PALM. If not, see
	14	! <http://www.gnu.org/licenses/>.
[2259]	15	!
[4828]	16	! Copyright 1997-2021 Leibniz Universitaet Hannover
[4559]	17	!--------------------------------------------------------------------------------------------------!
[2259]	18	!
[4559]	19	!
[2259]	20	! Current revisions:
	21	! -----------------
[4603]	22	!
	23	!
[2259]	24	! Former revisions:
	25	! -----------------
	26	! $Id: synthetic_turbulence_generator_mod.f90 4851 2021-01-22 09:25:05Z gronemeier $
[4851]	27	! formatting clean-up
	28	!
	29	! 4848 2021-01-21 15:51:51Z gronemeier
[4848]	30	! replaced use_syn_turb_gen by syn_turb_gen
	31	!
	32	! 4843 2021-01-15 15:22:11Z raasch
[4843]	33	! local namelist parameter added to switch off the module although the respective module namelist
	34	! appears in the namelist file
	35	!
	36	! 4842 2021-01-14 10:42:28Z raasch
[4842]	37	! reading of namelist file and actions in case of namelist errors revised so that statement labels
	38	! and goto statements are not required any more
	39	!
	40	! 4828 2021-01-05 11:21:41Z Giersch
[4671]	41	! Implementation of downward facing USM and LSM surfaces
	42	!
	43	! 4647 2020-08-24 16:36:18Z suehring
[4842]	44	! Change default value of synthetic turbulence adjustment as well as compute_velocity_seeds_local
	45	! By default, the random-seed computation is now distributed among several cores. Especially for
[4647]	46	! large length scales this is significantly faster.
	47	!
	48	! 4640 2020-08-11 16:28:32Z suehring
[4842]	49	! - to avoid that the correction term in r11/r22 computation becomes unrealistically high, limit
[4640]	50	! Obukhov length (term is not valid for near neutral conditions)
	51	! - to avoid unrealistically large perturbations, change computation of r21 so that this resembles
	52	! the vertical transport of horizontal momentum
	53	!
	54	! 4629 2020-07-29 09:37:56Z raasch
[4629]	55	! support for MPI Fortran77 interface (mpif.h) removed
	56	!
	57	! 4603 2020-07-14 16:08:30Z suehring
[4603]	58	! Bugfix in initialization from ASCII file - x-length scales at the bottom boundary were not
	59	! initialized properly
[4842]	60	!
[4603]	61	! 4566 2020-06-16 10:11:51Z suehring
[4566]	62	! - revise parametrization for reynolds-stress components, turbulent length- and time scales
	63	! - revise computation of velocity disturbances to be consistent to Xie and Castro (2008)
	64	! - change default value of time interval to adjust turbulence parametrization
	65	! - bugfix in computation of amplitude-tensor (vertical flux of horizontal momentum)
[4842]	66	!
[4566]	67	! 4562 2020-06-12 08:38:47Z raasch
[4562]	68	! Parts of r4559 re-formatted
[4842]	69	!
[4562]	70	! 4559 2020-06-11 08:51:48Z raasch
[4559]	71	! File re-formatted to follow the PALM coding standard
	72	!
	73	! 4535 2020-05-15 12:07:23Z raasch
	74	! Bugfix for restart data format query
	75	!
[4535]	76	! 4495 2020-04-13 20:11:20Z raasch
[4559]	77	! Restart data handling with MPI-IO added
	78	!
[4495]	79	! 4481 2020-03-31 18:55:54Z maronga
[4559]	80	! Bugfix: cpp-directives for serial mode added, dummy statements to prevent compile errors added
	81	!
[4444]	82	! 4442 2020-03-04 19:21:13Z suehring
[4442]	83	! Set back turbulent length scale to 8 x grid spacing in the parametrized mode
	84	! (was accidantly changed).
[4559]	85	!
[4442]	86	! 4441 2020-03-04 19:20:35Z suehring
[4440]	87	! Correct misplaced preprocessor directive
[4559]	88	!
[4440]	89	! 4438 2020-03-03 20:49:28Z suehring
[4438]	90	! Performance optimizations in velocity-seed calculation:
[4559]	91	! - Random number array is only defined and computed locally (except for normalization to zero mean
	92	! and unit variance)
	93	! - Parallel random number generator is applied independent on the 2D random numbers in other
	94	! routines
	95	! - Option to decide wheter velocity seeds are computed locally without any further communication
	96	! or are computed by all processes along the communicator
	97	!
[4438]	98	! 4346 2019-12-18 11:55:56Z motisi
[4559]	99	! Introduction of wall_flags_total_0, which currently sets bits based on static topography
	100	! information used in wall_flags_static_0
	101	!
[4346]	102	! 4335 2019-12-12 16:39:05Z suehring
[4335]	103	! Commentation of last commit
[4559]	104	!
[4335]	105	! 4332 2019-12-10 19:44:12Z suehring
[4559]	106	! Limit initial velocity seeds in restart runs, if not the seed calculation may become unstable.
	107	! Further, minor bugfix in initial velocity seed calculation.
	108	!
[4332]	109	! 4329 2019-12-10 15:46:36Z motisi
[4329]	110	! Renamed wall_flags_0 to wall_flags_static_0
[4559]	111	!
[4329]	112	! 4309 2019-11-26 18:49:59Z suehring
[4559]	113	! Computation of velocity seeds optimized. This implies that random numbers are computed now using
	114	! the parallel random number generator. Random numbers are now only computed and normalized locally,
	115	! while distributed over all mpi ranks afterwards, instead of computing random numbers on a global
	116	! array.
	117	! Further, the number of calls for the time-consuming velocity-seed generation is reduced - now the
	118	! left and right, as well as the north and south boundary share the same velocity-seed matrices.
	119	!
[4309]	120	! 4182 2019-08-22 15:20:23Z scharf
[4182]	121	! Corrected "Former revisions" section
[4559]	122	!
[4182]	123	! 4148 2019-08-08 11:26:00Z suehring
[4148]	124	! Remove unused variable
[4559]	125	!
[4148]	126	! 4144 2019-08-06 09:11:47Z raasch
[4559]	127	! Relational operators .EQ., .NE., etc. replaced by ==, /=, etc.
	128	!
[4144]	129	! 4071 2019-07-03 20:02:00Z suehring
[4559]	130	! Bugfix, initialize mean_inflow_profiles in case turbulence and inflow information is not read from
	131	! file.
	132	!
[4071]	133	! 4022 2019-06-12 11:52:39Z suehring
[4022]	134	! Several bugfixes and improvements
[4559]	135	! - Revise bias correction of the imposed perturbations (correction via volume flow can create
	136	! instabilities in case the mean volume flow is close to zero)
	137	! - Introduce lower limits in calculation of coefficient matrix, else the calculation may become
	138	! numerically unstable
	139	! - Impose perturbations every timestep, even though no new set of perturbations is generated in
	140	! case dt_stg_call /= dt_3d
	141	! - Implement a gradual decrease of Reynolds stress and length scales above ABL height (within 1
	142	! length scale above ABL depth to 1/10) rather than a discontinuous decrease
[4022]	143	! - Bugfix in non-nested case: use ABL height for parametrized turbulence
[4559]	144	!
[4022]	145	! 3987 2019-05-22 09:52:13Z kanani
[3987]	146	! Introduce alternative switch for debug output during timestepping
[4559]	147	!
[3987]	148	! 3938 2019-04-29 16:06:25Z suehring
[3938]	149	! Remove unused variables
[4559]	150	!
[3938]	151	! 3937 2019-04-29 15:09:07Z suehring
[4559]	152	! Minor bugfix in case of a very early restart where mc_factor is sill not present.
	153	! Some modification and fixing of potential bugs in the calculation of scaling parameters used for
	154	! synthetic turbulence parametrization.
	155	!
[3937]	156	! 3909 2019-04-17 09:13:25Z suehring
[3909]	157	! Minor bugfix for last commit
[4559]	158	!
[3909]	159	! 3900 2019-04-16 15:17:43Z suehring
[3900]	160	! Missing re-calculation of perturbation seeds in case of restarts
[4559]	161	!
[3900]	162	! 3891 2019-04-12 17:52:01Z suehring
[4559]	163	! Bugfix in initialization in case of restart runs.
	164	!
[3891]	165	! 3885 2019-04-11 11:29:34Z kanani
[4559]	166	! Changes related to global restructuring of location messages and introduction of additional debug
	167	! messages
	168	!
	169	!
	170	! Removed unused variables
	171	!
[3775]	172	! 3719 2019-02-06 13:10:18Z kanani
[4559]	173	! Removed log_point measurement from stg_init, since this part is counted to log_point(2)
	174	! 'initialization' already. Moved other log_points to calls of the subroutines in time_integration
	175	! for better overview.
	176	!
[4182]	177	! 2259 2017-06-08 09:09:11Z gronemeier
	178	! Initial revision
[3044]	179	!
[4182]	180	! Authors:
	181	! --------
	182	! @author Tobias Gronemeier, Matthias Suehring, Atsushi Inagaki, Micha Gryschka, Christoph Knigge
	183	!
	184	!
[2259]	185	! Description:
	186	! ------------
[4559]	187	!> The module generates turbulence at the inflow boundary based on a method by Xie and Castro (2008)
	188	!> utilizing a Lund rotation (Lund, 1998) and a mass-flux correction by Kim et al. (2013).
	189	!> The turbulence is correlated based on length scales in y- and z-direction and a time scale for
	190	!> each velocity component. The profiles of length and time scales, mean u, v, w, e and pt, and all
	191	!> components of the Reynolds stress tensor can be either read from file STG_PROFILES, or will be
	192	!> parametrized within the boundary layer.
[2259]	193	!>
[4566]	194	!> @todo Enable cyclic_fill
[4559]	195	!> Implement turbulence generation for e and pt
[2259]	196	!> @note <Enter notes on the module>
[4559]	197	!> @bug Height information from input file is not used. Profiles from input must match with current
	198	!> PALM grid.
	199	!> In case of restart, velocity seeds differ from precursor run if a11, a22, or a33 are zero.
	200	!--------------------------------------------------------------------------------------------------!
[2259]	201	MODULE synthetic_turbulence_generator_mod
	202
	203
[4559]	204	USE arrays_3d, &
	205	ONLY: dzw, &
	206	ddzw, &
	207	drho_air, &
	208	mean_inflow_profiles, &
	209	pt, &
	210	pt_init, &
	211	q, &
	212	q_init, &
	213	u, &
	214	u_init, &
	215	v, &
	216	v_init, &
	217	w, &
	218	zu, &
[4022]	219	zw
[2259]	220
[4559]	221	USE basic_constants_and_equations_mod, &
	222	ONLY: g, &
	223	kappa, &
[4022]	224	pi
[2259]	225
[4559]	226	USE control_parameters, &
	227	ONLY: bc_lr, &
	228	bc_ns, &
	229	child_domain, &
	230	coupling_char, &
	231	debug_output_timestep, &
	232	dt_3d, &
	233	e_init, &
	234	humidity, &
	235	initializing_actions, &
	236	intermediate_timestep_count, &
	237	intermediate_timestep_count_max, &
	238	length, &
	239	message_string, &
	240	nesting_offline, &
	241	neutral, &
	242	num_mean_inflow_profiles, &
	243	random_generator, &
	244	rans_mode, &
	245	restart_data_format_output, &
	246	restart_string, &
	247	syn_turb_gen, &
	248	time_since_reference_point, &
[4022]	249	turbulent_inflow
[4438]	250
[4559]	251	USE cpulog, &
	252	ONLY: cpu_log, &
[4438]	253	log_point_s
	254
[4559]	255	USE grid_variables, &
	256	ONLY: ddx, &
	257	ddy, &
	258	dx, &
[4022]	259	dy
[2259]	260
[4559]	261	USE indices, &
	262	ONLY: nbgp, &
	263	nz, &
	264	nzb, &
	265	nzt, &
	266	nx, &
	267	nxl, &
	268	nxlu, &
	269	nxr, &
	270	ny, &
	271	nys, &
	272	nysv, &
	273	nyn, &
[4346]	274	wall_flags_total_0
[2259]	275
	276	USE kinds
	277
[4629]	278	#if defined( __parallel )
[2259]	279	USE MPI
[2841]	280	#endif
[2259]	281
[4559]	282	USE nesting_offl_mod, &
	283	ONLY: nesting_offl_calc_zi, &
[4022]	284	zi_ribulk
[3347]	285
[4559]	286	USE pegrid, &
	287	ONLY: comm1dx, &
	288	comm1dy, &
	289	comm2d, &
	290	ierr, &
	291	myidx, &
	292	myidy, &
[4022]	293	pdims
[4438]	294
[4559]	295	USE pmc_interface, &
[4022]	296	ONLY : rans_mode_parent
[4438]	297
[4559]	298	USE random_generator_parallel, &
	299	ONLY: init_parallel_random_generator, &
	300	random_dummy, &
	301	random_number_parallel, &
[4438]	302	random_seed_parallel
[2259]	303
[4495]	304	USE restart_data_mpi_io_mod, &
	305	ONLY: rrd_mpi_io, &
	306	wrd_mpi_io
	307
[4559]	308	USE transpose_indices, &
	309	ONLY: nzb_x, &
	310	nzt_x
[2259]	311
[4559]	312	USE surface_mod, &
	313	ONLY: surf_def_h, &
	314	surf_lsm_h, &
[4438]	315	surf_usm_h
[2259]	316
	317	IMPLICIT NONE
	318
[3038]	319	INTEGER(iwp) :: id_stg_left !< left lateral boundary core id in case of turbulence generator
	320	INTEGER(iwp) :: id_stg_north !< north lateral boundary core id in case of turbulence generator
	321	INTEGER(iwp) :: id_stg_right !< right lateral boundary core id in case of turbulence generator
	322	INTEGER(iwp) :: id_stg_south !< south lateral boundary core id in case of turbulence generator
[4566]	323	INTEGER(iwp) :: k_zi !< vertical index of boundary-layer top
	324	INTEGER(iwp) :: mergp_limit = 1000 !< maximum length scale (in gp)
	325	INTEGER(iwp) :: mergp_x !< maximum length scale in x (in gp)
	326	INTEGER(iwp) :: mergp_xy !< maximum horizontal length scale (in gp)
	327	INTEGER(iwp) :: mergp_y !< maximum length scale in y (in gp)
	328	INTEGER(iwp) :: mergp_z !< maximum length scale in z (in gp)
[3038]	329	INTEGER(iwp) :: nzb_x_stg !< lower bound of z coordinate (required for transposing z on PEs along x)
	330	INTEGER(iwp) :: nzt_x_stg !< upper bound of z coordinate (required for transposing z on PEs along x)
	331	INTEGER(iwp) :: nzb_y_stg !< lower bound of z coordinate (required for transposing z on PEs along y)
	332	INTEGER(iwp) :: nzt_y_stg !< upper bound of z coordinate (required for transposing z on PEs along y)
[4444]	333	#if defined( __parallel )
[4309]	334	INTEGER(iwp) :: stg_type_xz !< MPI type for full z range
	335	INTEGER(iwp) :: stg_type_xz_small !< MPI type for small z range
	336	INTEGER(iwp) :: stg_type_yz !< MPI type for full z range
	337	INTEGER(iwp) :: stg_type_yz_small !< MPI type for small z range
[4444]	338	#endif
[2259]	339
[4559]	340	INTEGER(iwp), DIMENSION(3) :: nr_non_topo_xz = 0 !< number of non-topography grid points at xz cross-sections,
	341	!< required for bias correction of imposed perturbations
	342	INTEGER(iwp), DIMENSION(3) :: nr_non_topo_yz = 0 !< number of non-topography grid points at yz cross-sections,
	343	!< required for bias correction of imposed perturbations
	344
[4444]	345	#if defined( __parallel )
[3347]	346	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: displs_xz !< displacement for MPI_GATHERV
	347	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: recv_count_xz !< receive count for MPI_GATHERV
	348	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: displs_yz !< displacement for MPI_GATHERV
	349	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: recv_count_yz !< receive count for MPI_GATHERV
[4444]	350	#endif
[3347]	351	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nux !< length scale of u in x direction (in gp)
	352	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuy !< length scale of u in y direction (in gp)
	353	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuz !< length scale of u in z direction (in gp)
	354	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvx !< length scale of v in x direction (in gp)
	355	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvy !< length scale of v in y direction (in gp)
	356	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvz !< length scale of v in z direction (in gp)
	357	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwx !< length scale of w in x direction (in gp)
	358	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwy !< length scale of w in y direction (in gp)
	359	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwz !< length scale of w in z direction (in gp)
[2259]	360
[4559]	361	INTEGER(isp), DIMENSION(:), ALLOCATABLE :: id_rand_xz !< initial random IDs at xz inflow boundary
	362	INTEGER(isp), DIMENSION(:), ALLOCATABLE :: id_rand_yz !< initial random IDs at yz inflow boundary
	363	INTEGER(isp), DIMENSION(:,:), ALLOCATABLE :: seq_rand_xz !< initial random seeds at xz inflow boundary
	364	INTEGER(isp), DIMENSION(:,:), ALLOCATABLE :: seq_rand_yz !< initial random seeds at yz inflow boundary
[4438]	365
[2259]	366
[4566]	367	LOGICAL :: adjustment_step = .FALSE. !< control flag indicating that time and lenght scales have been updated and
	368	!< no time correlation to the timestep before should be considered
[4647]	369	LOGICAL :: compute_velocity_seeds_local = .FALSE. !< switch to decide whether velocity seeds are computed locally
[4559]	370	!< or if computation is distributed over several processes
	371	LOGICAL :: parametrize_inflow_turbulence = .FALSE. !< flag indicating that inflow turbulence is either read from file
	372	!< (.FALSE.) or if it parametrized
	373	LOGICAL :: velocity_seed_initialized = .FALSE. !< true after first call of stg_main
[2259]	374
[4559]	375
	376	REAL(wp) :: blend !< value to create gradually and smooth blending of Reynolds stress and length
	377	!< scales above the boundary layer
[4566]	378	REAL(wp) :: blend_coeff = -9.3_wp !< coefficient used to ensure that blending functions decreases to 1/10 after
[4559]	379	!< one length scale above ABL top
	380	REAL(wp) :: d_l !< blend_coeff/length_scale
[4566]	381	REAL(wp) :: d_nxy !< inverse of the total number of xy-grid points
	382	REAL(wp) :: dt_stg_adjust = 1800.0_wp !< time interval for adjusting turbulence statistics
[4559]	383	REAL(wp) :: dt_stg_call = 0.0_wp !< time interval for calling synthetic turbulence generator
	384	REAL(wp) :: scale_l !< scaling parameter used for turbulence parametrization - Obukhov length
	385	REAL(wp) :: scale_us !< scaling parameter used for turbulence parametrization - friction velocity
	386	REAL(wp) :: scale_wm !< scaling parameter used for turbulence parametrization - momentum scale
	387	REAL(wp) :: time_stg_adjust = 0.0_wp !< time counter for adjusting turbulence information
	388	REAL(wp) :: time_stg_call = 0.0_wp !< time counter for calling generator
	389
	390	REAL(wp), DIMENSION(3) :: mc_factor = 1.0_wp !< correction factor for the u,v,w-components to maintain original mass flux
	391
	392
	393	REAL(wp),DIMENSION(:), ALLOCATABLE :: r11 !< Reynolds parameter
	394	REAL(wp),DIMENSION(:), ALLOCATABLE :: r21 !< Reynolds parameter
	395	REAL(wp),DIMENSION(:), ALLOCATABLE :: r22 !< Reynolds parameter
	396	REAL(wp),DIMENSION(:), ALLOCATABLE :: r31 !< Reynolds parameter
	397	REAL(wp),DIMENSION(:), ALLOCATABLE :: r32 !< Reynolds parameter
	398	REAL(wp),DIMENSION(:), ALLOCATABLE :: r33 !< Reynolds parameter
	399
	400	REAL(wp), DIMENSION(:), ALLOCATABLE :: a11 !< coefficient for Lund rotation
	401	REAL(wp), DIMENSION(:), ALLOCATABLE :: a21 !< coefficient for Lund rotation
	402	REAL(wp), DIMENSION(:), ALLOCATABLE :: a22 !< coefficient for Lund rotation
	403	REAL(wp), DIMENSION(:), ALLOCATABLE :: a31 !< coefficient for Lund rotation
	404	REAL(wp), DIMENSION(:), ALLOCATABLE :: a32 !< coefficient for Lund rotation
	405	REAL(wp), DIMENSION(:), ALLOCATABLE :: a33 !< coefficient for Lund rotation
	406	REAL(wp), DIMENSION(:), ALLOCATABLE :: tu !< Lagrangian time scale of u
	407	REAL(wp), DIMENSION(:), ALLOCATABLE :: tv !< Lagrangian time scale of v
	408	REAL(wp), DIMENSION(:), ALLOCATABLE :: tw !< Lagrangian time scale of w
	409
	410	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bux !< filter function for u in x direction
	411	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buy !< filter function for u in y direction
	412	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buz !< filter function for u in z direction
	413	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvx !< filter function for v in x direction
	414	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvy !< filter function for v in y direction
	415	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvz !< filter function for v in z direction
	416	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwx !< filter function for w in y direction
	417	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwy !< filter function for w in y direction
	418	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwz !< filter function for w in z direction
	419	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fu_xz !< velocity seed for u at xz plane
	420	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fuo_xz !< velocity seed for u at xz plane with new random number
	421	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fu_yz !< velocity seed for u at yz plane
	422	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fuo_yz !< velocity seed for u at yz plane with new random number
	423	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fv_xz !< velocity seed for v at xz plane
	424	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fvo_xz !< velocity seed for v at xz plane with new random number
	425	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fv_yz !< velocity seed for v at yz plane
	426	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fvo_yz !< velocity seed for v at yz plane with new random number
	427	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fw_xz !< velocity seed for w at xz plane
	428	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fwo_xz !< velocity seed for w at xz plane with new random number
	429	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fw_yz !< velocity seed for w at yz plane
	430	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fwo_yz !< velocity seed for w at yz plane with new random number
	431
[4566]	432	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: dist_xz !< disturbances for parallel/crosswind/vertical component at north/south boundary
	433	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: dist_yz !< disturbances for parallel/crosswind/vertical component at north/south boundary
[4559]	434
[2259]	435	!
	436	!-- PALM interfaces:
[3347]	437	!-- Adjust time and lenght scales, Reynolds stress, and filter functions
	438	INTERFACE stg_adjust
	439	MODULE PROCEDURE stg_adjust
	440	END INTERFACE stg_adjust
	441	!
[2259]	442	!-- Input parameter checks to be done in check_parameters
	443	INTERFACE stg_check_parameters
	444	MODULE PROCEDURE stg_check_parameters
	445	END INTERFACE stg_check_parameters
	446
	447	!
	448	!-- Calculate filter functions
	449	INTERFACE stg_filter_func
	450	MODULE PROCEDURE stg_filter_func
	451	END INTERFACE stg_filter_func
	452
	453	!
[2938]	454	!-- Generate velocity seeds at south and north domain boundary
	455	INTERFACE stg_generate_seed_xz
	456	MODULE PROCEDURE stg_generate_seed_xz
	457	END INTERFACE stg_generate_seed_xz
	458	!
	459	!-- Generate velocity seeds at left and/or right domain boundary
[2259]	460	INTERFACE stg_generate_seed_yz
	461	MODULE PROCEDURE stg_generate_seed_yz
	462	END INTERFACE stg_generate_seed_yz
	463
	464	!
	465	!-- Output of information to the header file
	466	INTERFACE stg_header
	467	MODULE PROCEDURE stg_header
	468	END INTERFACE stg_header
	469
	470	!
	471	!-- Initialization actions
	472	INTERFACE stg_init
	473	MODULE PROCEDURE stg_init
	474	END INTERFACE stg_init
	475
	476	!
	477	!-- Main procedure of synth. turb. gen.
	478	INTERFACE stg_main
	479	MODULE PROCEDURE stg_main
	480	END INTERFACE stg_main
	481
	482	!
	483	!-- Reading of NAMELIST parameters
	484	INTERFACE stg_parin
	485	MODULE PROCEDURE stg_parin
	486	END INTERFACE stg_parin
	487
	488	!
	489	!-- Reading of parameters for restart runs
[2894]	490	INTERFACE stg_rrd_global
[4495]	491	MODULE PROCEDURE stg_rrd_global_ftn
	492	MODULE PROCEDURE stg_rrd_global_mpi
[2894]	493	END INTERFACE stg_rrd_global
[2259]	494
	495	!
	496	!-- Writing of binary output for restart runs
[2894]	497	INTERFACE stg_wrd_global
	498	MODULE PROCEDURE stg_wrd_global
	499	END INTERFACE stg_wrd_global
[2259]	500
	501	SAVE
	502
	503	PRIVATE
	504
	505	!
	506	!-- Public interfaces
[4559]	507	PUBLIC stg_adjust, &
	508	stg_check_parameters, &
	509	stg_header, &
	510	stg_init, &
	511	stg_main, &
	512	stg_parin, &
	513	stg_rrd_global, &
	514	stg_wrd_global
[2259]	515
	516	!
	517	!-- Public variables
[4559]	518	PUBLIC dt_stg_call, &
	519	dt_stg_adjust, &
	520	id_stg_left, &
	521	id_stg_north, &
	522	id_stg_right, &
	523	id_stg_south, &
	524	parametrize_inflow_turbulence, &
	525	time_stg_adjust, &
[4848]	526	time_stg_call
[2259]	527
	528
	529	CONTAINS
	530
	531
[4559]	532	!--------------------------------------------------------------------------------------------------!
[2259]	533	! Description:
	534	! ------------
	535	!> Check parameters routine for synthetic turbulence generator
[4559]	536	!--------------------------------------------------------------------------------------------------!
[2259]	537	SUBROUTINE stg_check_parameters
	538
[4851]	539	IF ( .NOT. syn_turb_gen .AND. .NOT. rans_mode .AND. &
[3182]	540	nesting_offline ) THEN
[4559]	541	message_string = 'Synthetic turbulence generator is required ' // &
	542	'if offline nesting is applied and PALM operates in LES mode.'
[3376]	543	CALL message( 'stg_check_parameters', 'PA0520', 0, 0, 0, 6, 0 )
[2938]	544	ENDIF
	545
[4851]	546	IF ( .NOT. syn_turb_gen .AND. child_domain &
[2938]	547	.AND. rans_mode_parent .AND. .NOT. rans_mode ) THEN
[4559]	548	message_string = 'Synthetic turbulence generator is required when nesting is applied ' // &
	549	'and parent operates in RANS-mode but current child in LES mode.'
[3376]	550	CALL message( 'stg_check_parameters', 'PA0524', 1, 2, 0, 6, 0 )
[2938]	551	ENDIF
	552
[4848]	553	IF ( syn_turb_gen ) THEN
[2259]	554
[4559]	555	IF ( child_domain .AND. .NOT. rans_mode .AND. .NOT. rans_mode_parent ) THEN
	556	message_string = 'Using synthetic turbulence generator is not allowed in LES-LES nesting.'
[3579]	557	CALL message( 'stg_check_parameters', 'PA0620', 1, 2, 0, 6, 0 )
[4559]	558
[3579]	559	ENDIF
[4559]	560
	561	IF ( child_domain .AND. rans_mode .AND. rans_mode_parent ) THEN
	562	message_string = 'Using synthetic turbulence generator is not allowed in RANS-RANS nesting.'
[3579]	563	CALL message( 'stg_check_parameters', 'PA0621', 1, 2, 0, 6, 0 )
[4559]	564
[3579]	565	ENDIF
[4559]	566
	567	IF ( .NOT. nesting_offline .AND. .NOT. child_domain ) THEN
	568
	569	IF ( INDEX( initializing_actions, 'set_constant_profiles' ) == 0 &
	570	.AND. INDEX( initializing_actions, 'read_restart_data' ) == 0 ) THEN
	571	message_string = 'Using synthetic turbulence generator requires ' // &
	572	'%initializing_actions = "set_constant_profiles" or ' // &
	573	' "read_restart_data", if not offline nesting is applied.'
[2938]	574	CALL message( 'stg_check_parameters', 'PA0015', 1, 2, 0, 6, 0 )
	575	ENDIF
	576
	577	IF ( bc_lr /= 'dirichlet/radiation' ) THEN
[4559]	578	message_string = 'Using synthetic turbulence generator requires &bc_lr = ' // &
	579	' "dirichlet/radiation", if not offline nesting is applied.'
[2938]	580	CALL message( 'stg_check_parameters', 'PA0035', 1, 2, 0, 6, 0 )
	581	ENDIF
	582	IF ( bc_ns /= 'cyclic' ) THEN
[4559]	583	message_string = 'Using synthetic turbulence generator requires &bc_ns = ' // &
	584	' "cyclic", if not offline nesting is applied.'
[2938]	585	CALL message( 'stg_check_parameters', 'PA0037', 1, 2, 0, 6, 0 )
	586	ENDIF
	587
[2259]	588	ENDIF
	589
	590	IF ( turbulent_inflow ) THEN
[4559]	591	message_string = 'Using synthetic turbulence generator in combination ' // &
	592	'&with turbulent_inflow = .T. is not allowed'
[2259]	593	CALL message( 'stg_check_parameters', 'PA0039', 1, 2, 0, 6, 0 )
	594	ENDIF
[4309]	595	!
	596	!-- Synthetic turbulence generator requires the parallel random generator
	597	IF ( random_generator /= 'random-parallel' ) THEN
[4559]	598	message_string = 'Using synthetic turbulence generator requires random_generator = ' // &
	599	'random-parallel.'
[4309]	600	CALL message( 'stg_check_parameters', 'PA0421', 1, 2, 0, 6, 0 )
	601	ENDIF
[2259]	602
	603	ENDIF
	604
	605	END SUBROUTINE stg_check_parameters
	606
	607
[4559]	608	!--------------------------------------------------------------------------------------------------!
[2259]	609	! Description:
	610	! ------------
	611	!> Header output for synthetic turbulence generator
[4559]	612	!--------------------------------------------------------------------------------------------------!
[2259]	613	SUBROUTINE stg_header ( io )
	614
[4559]	615	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
[2259]	616
	617	!
	618	!-- Write synthetic turbulence generator Header
[4848]	619	IF ( syn_turb_gen ) THEN
	620	WRITE( io, 1 )
	621	IF ( parametrize_inflow_turbulence ) THEN
	622	WRITE( io, 4 ) dt_stg_adjust
	623	ELSE
	624	WRITE( io, 5 )
	625	ENDIF
[2259]	626	ENDIF
[4559]	627
	628	1 FORMAT (//' Synthetic turbulence generator information:'/ &
[2259]	629	' ------------------------------------------'/)
[3348]	630	4 FORMAT (' imposed turbulence statistics are parametrized and ajdusted to boundary-layer development each ', F8.2, ' s' )
[3347]	631	5 FORMAT (' imposed turbulence is read from file' )
[2259]	632
	633	END SUBROUTINE stg_header
	634
	635
[4559]	636	!--------------------------------------------------------------------------------------------------!
[2259]	637	! Description:
	638	! ------------
	639	!> Initialization of the synthetic turbulence generator
[4559]	640	!--------------------------------------------------------------------------------------------------!
[2259]	641	SUBROUTINE stg_init
	642
[2669]	643	#if defined( __parallel )
[4559]	644	INTEGER(KIND=MPI_ADDRESS_KIND) :: extent !< extent of new MPI type
	645	INTEGER(KIND=MPI_ADDRESS_KIND) :: tob = 0 !< dummy variable
[2669]	646	#endif
[2259]	647
[4559]	648	INTEGER(iwp) :: i !> grid index in x-direction
	649	INTEGER(iwp) :: j !> loop index
	650	INTEGER(iwp) :: k !< index
[4444]	651	#if defined( __parallel )
[4559]	652	INTEGER(iwp) :: newtype !< dummy MPI type
	653	INTEGER(iwp) :: realsize !< size of REAL variables
[4444]	654	#endif
[4309]	655
[4022]	656	INTEGER(iwp), DIMENSION(3) :: nr_non_topo_xz_l = 0 !< number of non-topography grid points at xz-cross-section on subdomain
	657	INTEGER(iwp), DIMENSION(3) :: nr_non_topo_yz_l = 0 !< number of non-topography grid points at yz-cross-section on subdomain
[4559]	658
	659
	660	LOGICAL :: file_stg_exist = .FALSE. !< flag indicating whether parameter file for Reynolds stress and length scales exist
	661
[2259]	662	!
	663	!-- Dummy variables used for reading profiles
[4559]	664	REAL(wp) :: d1 !< u profile
	665	REAL(wp) :: d2 !< v profile
	666	REAL(wp) :: d3 !< w profile
	667	REAL(wp) :: d5 !< e profile
	668	REAL(wp) :: luy !< length scale for u in y direction
	669	REAL(wp) :: luz !< length scale for u in z direction
	670	REAL(wp) :: lvy !< length scale for v in y direction
	671	REAL(wp) :: lvz !< length scale for v in z direction
	672	REAL(wp) :: lwy !< length scale for w in y direction
	673	REAL(wp) :: lwz !< length scale for w in z direction
[4444]	674	#if defined( __parallel )
[4559]	675	REAL(wp) :: nnz !< increment used to determine processor decomposition of z-axis along x and y direction
[4444]	676	#endif
[4559]	677	REAL(wp) :: zz !< height
[2259]	678
[2938]	679
[2259]	680	#if defined( __parallel )
	681	CALL MPI_BARRIER( comm2d, ierr )
	682	#endif
[4438]	683	!
[4559]	684	!-- Create mpi-datatypes for exchange in case of non-local but distributed computation of the
	685	!-- velocity seeds. This option is useful in case large turbulent length scales are present, where
	686	!-- the computational effort becomes large and needs to be parallelized. For parameterized turbulence
	687	!-- the length scales are small and computing the velocity seeds locally is faster (no overhead by
	688	!-- communication).
[4438]	689	IF ( .NOT. compute_velocity_seeds_local ) THEN
[2669]	690	#if defined( __parallel )
[4559]	691	!
[4438]	692	!-- Determine processor decomposition of z-axis along x- and y-direction
	693	nnz = nz / pdims(1)
	694	nzb_x_stg = 1 + myidx * INT( nnz )
	695	nzt_x_stg = ( myidx + 1 ) * INT( nnz )
[4559]	696
	697	IF ( MOD( nz , pdims(1) ) /= 0 .AND. myidx == id_stg_right ) &
[4438]	698	nzt_x_stg = nzt_x_stg + myidx * ( nnz - INT( nnz ) )
[4559]	699
	700	IF ( nesting_offline .OR. ( child_domain .AND. rans_mode_parent &
[4438]	701	.AND. .NOT. rans_mode ) ) THEN
	702	nnz = nz / pdims(2)
	703	nzb_y_stg = 1 + myidy * INT( nnz )
	704	nzt_y_stg = ( myidy + 1 ) * INT( nnz )
[4559]	705
	706	IF ( MOD( nz , pdims(2) ) /= 0 .AND. myidy == id_stg_north ) &
[4438]	707	nzt_y_stg = nzt_y_stg + myidy * ( nnz - INT( nnz ) )
	708	ENDIF
[4559]	709
	710	!
	711	!-- Define MPI type used in stg_generate_seed_yz to gather vertical splitted velocity seeds
[4438]	712	CALL MPI_TYPE_SIZE( MPI_REAL, realsize, ierr )
	713	extent = 1 * realsize
[4559]	714	!
	715	!-- Set-up MPI datatyp to involve all cores for turbulence generation at yz layer
[4438]	716	!-- stg_type_yz: yz-slice with vertical bounds nzb:nzt+1
[4559]	717	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt-nzb+2,nyn-nys+1], &
[4438]	718	[1,nyn-nys+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
	719	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz, ierr )
	720	CALL MPI_TYPE_COMMIT( stg_type_yz, ierr )
[2938]	721	CALL MPI_TYPE_FREE( newtype, ierr )
[4559]	722
[4438]	723	! stg_type_yz_small: yz-slice with vertical bounds nzb_x_stg:nzt_x_stg+1
[4559]	724	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt_x_stg-nzb_x_stg+2,nyn-nys+1], &
[4438]	725	[1,nyn-nys+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
	726	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz_small, ierr )
	727	CALL MPI_TYPE_COMMIT( stg_type_yz_small, ierr )
[2938]	728	CALL MPI_TYPE_FREE( newtype, ierr )
[4559]	729
	730	! Receive count and displacement for MPI_GATHERV in stg_generate_seed_yz
[4438]	731	ALLOCATE( recv_count_yz(pdims(1)), displs_yz(pdims(1)) )
[4559]	732
[4438]	733	recv_count_yz = nzt_x_stg-nzb_x_stg + 1
	734	recv_count_yz(pdims(1)) = recv_count_yz(pdims(1)) + 1
[4559]	735
[4438]	736	DO j = 1, pdims(1)
	737	displs_yz(j) = 0 + (nzt_x_stg-nzb_x_stg+1) * (j-1)
[2938]	738	ENDDO
[4559]	739	!
	740	!-- Set-up MPI datatyp to involve all cores for turbulence generation at xz layer
[4438]	741	!-- stg_type_xz: xz-slice with vertical bounds nzb:nzt+1
[4851]	742	IF ( nesting_offline .OR. ( child_domain .AND. rans_mode_parent &
	743	.AND. .NOT. rans_mode ) ) THEN
	744	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt-nzb+2,nxr-nxl+1], &
[4438]	745	[1,nxr-nxl+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
	746	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_xz, ierr )
	747	CALL MPI_TYPE_COMMIT( stg_type_xz, ierr )
	748	CALL MPI_TYPE_FREE( newtype, ierr )
[4559]	749
[4438]	750	! stg_type_yz_small: xz-slice with vertical bounds nzb_x_stg:nzt_x_stg+1
[4851]	751	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt_y_stg-nzb_y_stg+2,nxr-nxl+1], &
[4438]	752	[1,nxr-nxl+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
	753	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_xz_small, ierr )
	754	CALL MPI_TYPE_COMMIT( stg_type_xz_small, ierr )
	755	CALL MPI_TYPE_FREE( newtype, ierr )
[4559]	756
	757	! Receive count and displacement for MPI_GATHERV in stg_generate_seed_yz
[4438]	758	ALLOCATE( recv_count_xz(pdims(2)), displs_xz(pdims(2)) )
[4559]	759
[4438]	760	recv_count_xz = nzt_y_stg-nzb_y_stg + 1
	761	recv_count_xz(pdims(2)) = recv_count_xz(pdims(2)) + 1
[4559]	762
[4438]	763	DO j = 1, pdims(2)
	764	displs_xz(j) = 0 + (nzt_y_stg-nzb_y_stg+1) * (j-1)
	765	ENDDO
[4559]	766
[4438]	767	ENDIF
[4440]	768	#endif
[2938]	769	ENDIF
[2259]	770	!
[4071]	771	!-- Allocate required arrays.
[4559]	772	!-- In case no offline nesting or self nesting is used, the arrary mean_inflow profiles is required.
	773	!-- Check if it is already allocated, else allocate and initialize it appropriately. Note, in case
	774	!-- turbulence and inflow information is read from file, mean_inflow_profiles is already allocated
	775	!-- and initialized appropriately.
	776	IF ( .NOT. nesting_offline .AND. .NOT. child_domain ) THEN
[4071]	777	IF ( .NOT. ALLOCATED( mean_inflow_profiles ) ) THEN
[3347]	778	ALLOCATE( mean_inflow_profiles(nzb:nzt+1,1:num_mean_inflow_profiles) )
[4071]	779	mean_inflow_profiles = 0.0_wp
	780	mean_inflow_profiles(:,1) = u_init
	781	mean_inflow_profiles(:,2) = v_init
	782	!
[4559]	783	!-- Even though potential temperature and humidity are not perturbed, they need to be
	784	!-- initialized appropriately.
	785	IF ( .NOT. neutral ) &
[4071]	786	mean_inflow_profiles(:,4) = pt_init
[4559]	787	IF ( humidity ) &
	788	mean_inflow_profiles(:,6) = q_init
	789	ENDIF
[3347]	790	ENDIF
[4566]	791	!
[4842]	792	!-- Assign initial profiles. Note, this is only required if turbulent inflow from the left is
[4566]	793	!-- desired, not in case of any of the nesting (offline or self nesting) approaches.
[4842]	794	IF ( .NOT. nesting_offline .AND. .NOT. child_domain ) THEN
[4566]	795	u_init = mean_inflow_profiles(:,1)
	796	v_init = mean_inflow_profiles(:,2)
	797	e_init = MAXVAL( mean_inflow_profiles(:,5) )
	798	ENDIF
[2259]	799
[4559]	800	ALLOCATE ( a11(nzb:nzt+1), a21(nzb:nzt+1), a22(nzb:nzt+1), &
	801	a31(nzb:nzt+1), a32(nzb:nzt+1), a33(nzb:nzt+1), &
	802	nux(nzb:nzt+1), nuy(nzb:nzt+1), nuz(nzb:nzt+1), &
	803	nvx(nzb:nzt+1), nvy(nzb:nzt+1), nvz(nzb:nzt+1), &
	804	nwx(nzb:nzt+1), nwy(nzb:nzt+1), nwz(nzb:nzt+1), &
	805	r11(nzb:nzt+1), r21(nzb:nzt+1), r22(nzb:nzt+1), &
	806	r31(nzb:nzt+1), r32(nzb:nzt+1), r33(nzb:nzt+1), &
	807	tu(nzb:nzt+1), tv(nzb:nzt+1), tw(nzb:nzt+1) )
	808
[4566]	809	r11 = 0.0_wp
	810	r21 = 0.0_wp
	811	r22 = 0.0_wp
	812	r31 = 0.0_wp
	813	r32 = 0.0_wp
	814	r33 = 0.0_wp
	815	tu = 0.0_wp
	816	tv = 0.0_wp
	817	tw = 0.0_wp
	818
[4438]	819	ALLOCATE ( dist_xz(nzb:nzt+1,nxl:nxr,3) )
	820	ALLOCATE ( dist_yz(nzb:nzt+1,nys:nyn,3) )
[3347]	821	dist_xz = 0.0_wp
	822	dist_yz = 0.0_wp
	823	!
[2259]	824	!-- Read inflow profile
	825	!-- Height levels of profiles in input profile is as follows:
[4559]	826	!-- zu: luy, luz, tu, lvy, lvz, tv, r11, r21, r22, d1, d2, d5 zw: lwy, lwz, tw, r31, r32, r33, d3
[2259]	827	!-- WARNING: zz is not used at the moment
[4559]	828	INQUIRE( FILE = 'STG_PROFILES' // TRIM( coupling_char ), EXIST = file_stg_exist )
[2259]	829
[2938]	830	IF ( file_stg_exist ) THEN
[2259]	831
[4559]	832	OPEN( 90, FILE = 'STG_PROFILES' // TRIM( coupling_char ), STATUS = 'OLD', FORM = 'FORMATTED' )
[2938]	833	!
	834	!-- Skip header
	835	READ( 90, * )
[2259]	836
[4603]	837	DO k = nzb, nzt
[4559]	838	READ( 90, * ) zz, luy, luz, tu(k), lvy, lvz, tv(k), lwy, lwz, tw(k), r11(k), r21(k), &
	839	r22(k), r31(k), r32(k), r33(k), d1, d2, d3, d5
[2938]	840
[2259]	841	!
[4559]	842	!-- Convert length scales from meter to number of grid points.
[4603]	843	IF ( k /= nzb ) THEN
	844	nuz(k) = INT( luz * ddzw(k) )
	845	nvz(k) = INT( lvz * ddzw(k) )
	846	nwz(k) = INT( lwz * ddzw(k) )
	847	ELSE
	848	nuz(k) = INT( luz * ddzw(k+1) )
	849	nvz(k) = INT( lvz * ddzw(k+1) )
	850	nwz(k) = INT( lwz * ddzw(k+1) )
	851	ENDIF
	852
[2938]	853	nuy(k) = INT( luy * ddy )
	854	nvy(k) = INT( lvy * ddy )
	855	nwy(k) = INT( lwy * ddy )
	856	!
[4603]	857	!-- Set length scales in x-direction. As a workaround assume isotropic turbulence in x- and
	858	!-- y-direction.
[2938]	859	nwx(k) = nwy(k)
	860	nvx(k) = nvy(k)
	861	nux(k) = nuy(k)
	862	!
	863	!-- Save Mean inflow profiles
	864	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
	865	mean_inflow_profiles(k,1) = d1
	866	mean_inflow_profiles(k,2) = d2
	867	! mean_inflow_profiles(k,4) = d4
	868	mean_inflow_profiles(k,5) = d5
	869	ENDIF
	870	ENDDO
[3182]	871	!
[4603]	872	!-- Set length scales at the surface and top boundary. At the surface the lengths scales are
	873	!-- simply overwritten.
	874	nwx(nzb) = nwy(nzb+1)
	875	nvx(nzb) = nvy(nzb+1)
	876	nux(nzb) = nuy(nzb+1)
[4559]	877	nuy(nzb) = nuy(nzb+1)
[3182]	878	nuz(nzb) = nuz(nzb+1)
	879	nvy(nzb) = nvy(nzb+1)
	880	nvz(nzb) = nvz(nzb+1)
	881	nwy(nzb) = nwy(nzb+1)
	882	nwz(nzb) = nwz(nzb+1)
[4559]	883
[4603]	884	nwx(nzt+1) = nwy(nzt)
	885	nvx(nzt+1) = nvy(nzt)
	886	nux(nzt+1) = nuy(nzt)
	887	nuy(nzt+1) = nuy(nzt)
	888	nuz(nzt+1) = nuz(nzt)
	889	nvy(nzt+1) = nvy(nzt)
	890	nvz(nzt+1) = nvz(nzt)
	891	nwy(nzt+1) = nwy(nzt)
	892	nwz(nzt+1) = nwz(nzt)
	893
[2938]	894	CLOSE( 90 )
[3347]	895	!
[4559]	896	!-- Calculate coefficient matrix from Reynolds stress tensor (Lund rotation)
[3347]	897	CALL calc_coeff_matrix
	898	!
[4559]	899	!-- No information about turbulence and its length scales are available. Instead, parametrize
	900	!-- turbulence which is imposed at the boundaries. Set flag which indicates that turbulence is
	901	!-- parametrized, which is done later when energy-balance models are already initialized. This is
	902	!-- because the STG needs information about surface properties such as roughness to build
	903	!-- 'realistic' turbulence profiles.
[2938]	904	ELSE
[2259]	905	!
[4566]	906	!-- Precalulate the inversion number of xy-grid points - later used for mass conservation
	907	d_nxy = 1.0_wp / REAL( ( nx + 1 ) * ( ny + 1 ), KIND = wp )
[4022]	908	!
[3347]	909	!-- Set flag indicating that turbulence is parametrized
	910	parametrize_inflow_turbulence = .TRUE.
	911	!
[4559]	912	!-- In case of dirichlet inflow boundary conditions only at one lateral boundary, i.e. in the
	913	!-- case no offline or self nesting is applied but synthetic turbulence shall be parametrized
	914	!-- nevertheless, the boundary-layer depth needs to be determined first.
	915	IF ( .NOT. nesting_offline .AND. .NOT. child_domain ) &
[4022]	916	CALL nesting_offl_calc_zi
	917	!
[4559]	918	!-- Determine boundary-layer depth, which is used to initialize lenght scales
[3347]	919	CALL calc_scaling_variables
	920	!
[4559]	921	!-- Parametrize Reynolds-stress tensor, diagonal elements as well as r21 (v'u'), r31 (w'u'),
	922	!-- r32 (w'v'). Parametrization follows Rotach et al. (1996) and is based on boundary-layer depth,
	923	!-- friction velocity and velocity scale.
[4566]	924	CALL parametrize_turbulence
[4559]	925	!
	926	!-- Calculate coefficient matrix from Reynolds stress tensor (Lund rotation)
[3891]	927	CALL calc_coeff_matrix
[4559]	928
[2938]	929	ENDIF
[2259]	930	!
[4566]	931	!-- Initial filter functions
	932	CALL stg_setup_filter_function
[2938]	933	!
	934	!-- Allocate velocity seeds for turbulence at xz-layer
[4559]	935	ALLOCATE ( fu_xz(nzb:nzt+1,nxl:nxr), fuo_xz(nzb:nzt+1,nxl:nxr), &
	936	fv_xz(nzb:nzt+1,nxl:nxr), fvo_xz(nzb:nzt+1,nxl:nxr), &
	937	fw_xz(nzb:nzt+1,nxl:nxr), fwo_xz(nzb:nzt+1,nxl:nxr) )
[2259]	938
[2938]	939	!
	940	!-- Allocate velocity seeds for turbulence at yz-layer
[4559]	941	ALLOCATE ( fu_yz(nzb:nzt+1,nys:nyn), fuo_yz(nzb:nzt+1,nys:nyn), &
	942	fv_yz(nzb:nzt+1,nys:nyn), fvo_yz(nzb:nzt+1,nys:nyn), &
	943	fw_yz(nzb:nzt+1,nys:nyn), fwo_yz(nzb:nzt+1,nys:nyn) )
[2259]	944
[2938]	945	fu_xz = 0.0_wp
	946	fuo_xz = 0.0_wp
	947	fv_xz = 0.0_wp
	948	fvo_xz = 0.0_wp
	949	fw_xz = 0.0_wp
	950	fwo_xz = 0.0_wp
	951
	952	fu_yz = 0.0_wp
	953	fuo_yz = 0.0_wp
	954	fv_yz = 0.0_wp
	955	fvo_yz = 0.0_wp
	956	fw_yz = 0.0_wp
	957	fwo_yz = 0.0_wp
	958
[2259]	959	#if defined( __parallel )
	960	CALL MPI_BARRIER( comm2d, ierr )
	961	#endif
	962
	963	!
[4559]	964	!-- In case of restart, calculate velocity seeds fu, fv, fw from former time step.
	965	! Bug: fu, fv, fw are different in those heights where a11, a22, a33 are 0 compared to the prerun.
	966	!-- This is mostly for k=nzt+1.
[2259]	967	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
[2938]	968	IF ( myidx == id_stg_left .OR. myidx == id_stg_right ) THEN
	969
	970	IF ( myidx == id_stg_left ) i = -1
	971	IF ( myidx == id_stg_right ) i = nxr+1
	972
[4438]	973	DO j = nys, nyn
[2259]	974	DO k = nzb, nzt+1
[4332]	975	IF ( a11(k) > 10E-8_wp ) THEN
[4022]	976	fu_yz(k,j) = ( u(k,j,i) - u_init(k) ) / a11(k)
[2259]	977	ELSE
[4332]	978	fu_yz(k,j) = 10E-8_wp
[2259]	979	ENDIF
	980
[4332]	981	IF ( a22(k) > 10E-8_wp ) THEN
[4559]	982	fv_yz(k,j) = ( v(k,j,i) - a21(k) * fu_yz(k,j) - v_init(k) ) / a22(k)
[2259]	983	ELSE
[4332]	984	fv_yz(k,j) = 10E-8_wp
[2259]	985	ENDIF
	986
[4332]	987	IF ( a33(k) > 10E-8_wp ) THEN
[4559]	988	fw_yz(k,j) = ( w(k,j,i) - a31(k) * fu_yz(k,j) - a32(k) * fv_yz(k,j) ) / a33(k)
[2259]	989	ELSE
[4332]	990	fw_yz(k,j) = 10E-8_wp
[2259]	991	ENDIF
	992	ENDDO
	993	ENDDO
	994	ENDIF
[4559]	995
[3900]	996	IF ( myidy == id_stg_south .OR. myidy == id_stg_north ) THEN
	997
	998	IF ( myidy == id_stg_south ) j = -1
	999	IF ( myidy == id_stg_north ) j = nyn+1
	1000
[4438]	1001	DO i = nxl, nxr
[3900]	1002	DO k = nzb, nzt+1
[4335]	1003	!
[4559]	1004	!-- In case the correlation coefficients are very small, the velocity seeds may become
	1005	!-- very large finally creating numerical instabilities in the synthetic turbulence
	1006	!-- generator. Empirically, a value of 10E-8 seems to be sufficient.
[4332]	1007	IF ( a11(k) > 10E-8_wp ) THEN
[4022]	1008	fu_xz(k,i) = ( u(k,j,i) - u_init(k) ) / a11(k)
[3900]	1009	ELSE
[4332]	1010	fu_xz(k,i) = 10E-8_wp
[3900]	1011	ENDIF
	1012
[4332]	1013	IF ( a22(k) > 10E-8_wp ) THEN
[4559]	1014	fv_xz(k,i) = ( v(k,j,i) - a21(k) * fu_xz(k,i) - v_init(k) ) / a22(k)
[3900]	1015	ELSE
[4332]	1016	fv_xz(k,i) = 10E-8_wp
[3900]	1017	ENDIF
	1018
[4332]	1019	IF ( a33(k) > 10E-8_wp ) THEN
[4559]	1020	fw_xz(k,i) = ( w(k,j,i) - a31(k) * fu_xz(k,i) - a32(k) * fv_xz(k,i) ) / a33(k)
[3900]	1021	ELSE
[4332]	1022	fw_xz(k,i) = 10E-8_wp
[3900]	1023	ENDIF
	1024
	1025	ENDDO
	1026	ENDDO
	1027	ENDIF
[2259]	1028	ENDIF
[4022]	1029	!
[4559]	1030	!-- Count the number of non-topography grid points at the boundaries where perturbations are imposed.
	1031	!-- This number is later used for bias corrections of the perturbations, i.e. to force their mean to
	1032	!-- be zero. Please note, due to the asymetry of u and v along x and y direction, respectively,
	1033	!-- different cases must be distinguished.
[4022]	1034	IF ( myidx == id_stg_left .OR. myidx == id_stg_right ) THEN
	1035	!
	1036	!-- Number of grid points where perturbations are imposed on u
	1037	IF ( myidx == id_stg_left ) i = nxl
	1038	IF ( myidx == id_stg_right ) i = nxr+1
[4559]	1039
	1040	nr_non_topo_yz_l(1) = SUM( MERGE( 1, 0, BTEST( wall_flags_total_0(nzb:nzt,nys:nyn,i), 1 ) ) )
[4022]	1041	!
[4559]	1042	!-- Number of grid points where perturbations are imposed on v and w
[4022]	1043	IF ( myidx == id_stg_left ) i = nxl-1
	1044	IF ( myidx == id_stg_right ) i = nxr+1
[4559]	1045
	1046	nr_non_topo_yz_l(2) = SUM( MERGE( 1, 0, BTEST( wall_flags_total_0(nzb:nzt,nysv:nyn,i), 2 ) ) )
	1047	nr_non_topo_yz_l(3) = SUM( MERGE( 1, 0, BTEST( wall_flags_total_0(nzb:nzt,nys:nyn,i), 3 ) ) )
	1048
[4022]	1049	#if defined( __parallel )
[4559]	1050	CALL MPI_ALLREDUCE( nr_non_topo_yz_l, nr_non_topo_yz, 3, MPI_INTEGER, MPI_SUM, comm1dy, ierr )
[4022]	1051	#else
	1052	nr_non_topo_yz = nr_non_topo_yz_l
[4559]	1053	#endif
[4022]	1054	ENDIF
[4559]	1055
[4022]	1056	IF ( myidy == id_stg_south .OR. myidy == id_stg_north ) THEN
	1057	!
	1058	!-- Number of grid points where perturbations are imposed on v
	1059	IF ( myidy == id_stg_south ) j = nys
	1060	IF ( myidy == id_stg_north ) j = nyn+1
[4559]	1061
	1062	nr_non_topo_xz_l(2) = SUM( MERGE( 1, 0, BTEST( wall_flags_total_0(nzb:nzt,j,nxl:nxr), 2 ) ) )
[4022]	1063	!
[4559]	1064	!-- Number of grid points where perturbations are imposed on u and w
[4022]	1065	IF ( myidy == id_stg_south ) j = nys-1
	1066	IF ( myidy == id_stg_north ) j = nyn+1
[4559]	1067
	1068	nr_non_topo_xz_l(1) = SUM( MERGE( 1, 0, BTEST( wall_flags_total_0(nzb:nzt,j,nxlu:nxr), 1 ) ) )
	1069	nr_non_topo_xz_l(3) = SUM( MERGE( 1, 0, BTEST( wall_flags_total_0(nzb:nzt,j,nxl:nxr), 3 ) ) )
	1070
[4022]	1071	#if defined( __parallel )
[4559]	1072	CALL MPI_ALLREDUCE( nr_non_topo_xz_l, nr_non_topo_xz, 3, MPI_INTEGER, MPI_SUM, comm1dx, ierr )
[4022]	1073	#else
	1074	nr_non_topo_xz = nr_non_topo_xz_l
[4559]	1075	#endif
[4022]	1076	ENDIF
[4438]	1077	!
[4559]	1078	!-- Initialize random number generator at xz- and yz-layers. Random numbers are initialized at each
	1079	!-- core. In case there is only inflow from the left, it is sufficient to generate only random
	1080	!-- numbers for the yz-layer, else random numbers for the xz-layer are also required.
[4566]	1081	ALLOCATE ( id_rand_yz(-mergp_limit+nys:nyn+mergp_limit) )
	1082	ALLOCATE ( seq_rand_yz(5,-mergp_limit+nys:nyn+mergp_limit) )
[4438]	1083	id_rand_yz = 0
	1084	seq_rand_yz = 0
[2259]	1085
[4566]	1086	CALL init_parallel_random_generator( ny, -mergp_limit+nys, nyn+mergp_limit, id_rand_yz, seq_rand_yz )
[4022]	1087
[4559]	1088	IF ( nesting_offline .OR. ( child_domain .AND. rans_mode_parent &
	1089	.AND. .NOT. rans_mode ) ) THEN
[4566]	1090	ALLOCATE ( id_rand_xz(-mergp_limit+nxl:nxr+mergp_limit) )
	1091	ALLOCATE ( seq_rand_xz(5,-mergp_limit+nxl:nxr+mergp_limit) )
[4438]	1092	id_rand_xz = 0
	1093	seq_rand_xz = 0
	1094
[4566]	1095	CALL init_parallel_random_generator( nx, -mergp_limit+nxl, nxr+mergp_limit, id_rand_xz, seq_rand_xz )
[4438]	1096	ENDIF
	1097
[2259]	1098	END SUBROUTINE stg_init
	1099
	1100
[4559]	1101	!--------------------------------------------------------------------------------------------------!
[2259]	1102	! Description:
	1103	! ------------
[4559]	1104	!> Calculate filter function bxx from length scale nxx following Eg.9 and 10 (Xie and Castro, 2008)
	1105	!--------------------------------------------------------------------------------------------------!
[4566]	1106	SUBROUTINE stg_filter_func( nxx, bxx, mergp )
[2259]	1107
[4566]	1108	INTEGER(iwp) :: k !< loop index
	1109	INTEGER(iwp) :: mergp !< passed length scale in grid points
	1110	INTEGER(iwp) :: n_k !< length scale nXX in height k
	1111	INTEGER(iwp) :: nf !< index for length scales
[2259]	1112
[4559]	1113	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: nxx !< length scale (in gp)
	1114
[2259]	1115	REAL(wp) :: bdenom !< denominator for filter functions bXX
	1116	REAL(wp) :: qsi = 1.0_wp !< minimization factor
	1117
[4438]	1118	REAL(wp), DIMENSION(-mergp:mergp,nzb:nzt+1) :: bxx !< filter function
[2259]	1119
	1120
	1121	bxx = 0.0_wp
	1122
	1123	DO k = nzb, nzt+1
	1124	bdenom = 0.0_wp
	1125	n_k = nxx(k)
	1126	IF ( n_k /= 0 ) THEN
	1127
	1128	!
	1129	!-- ( Eq.10 )^2
[4438]	1130	DO nf = -n_k, n_k
[4559]	1131	bdenom = bdenom + EXP( -qsi * pi * ABS( nf ) / n_k )**2
[2259]	1132	ENDDO
	1133
	1134	!
	1135	!-- ( Eq.9 )
	1136	bdenom = SQRT( bdenom )
[4438]	1137	DO nf = -n_k, n_k
[4559]	1138	bxx(nf,k) = EXP( -qsi * pi * ABS( nf ) / n_k ) / bdenom
[2259]	1139	ENDDO
	1140	ENDIF
	1141	ENDDO
	1142
[3347]	1143	END SUBROUTINE stg_filter_func
[2259]	1144
	1145
[4566]	1146	!------------------------------------------------------------------------------!
	1147	! Description:
	1148	! ------------
	1149	!> Calculate filter function bxx from length scale nxx following Eg.9 and 10
	1150	!> (Xie and Castro, 2008)
	1151	!------------------------------------------------------------------------------!
	1152	SUBROUTINE stg_setup_filter_function
	1153
	1154	INTEGER(iwp) :: j !< dummy value to calculate maximum length scale index
	1155	INTEGER(iwp) :: k !< loop index along vertical direction
	1156	!
	1157	!-- Define the size of the filter functions and allocate them.
	1158	mergp_x = 0
	1159	mergp_y = 0
	1160	mergp_z = 0
	1161
	1162	DO k = nzb, nzt+1
	1163	j = MAX( ABS(nux(k)), ABS(nvx(k)), ABS(nwx(k)) )
	1164	IF ( j > mergp_x ) mergp_x = j
	1165	ENDDO
	1166	DO k = nzb, nzt+1
	1167	j = MAX( ABS(nuy(k)), ABS(nvy(k)), ABS(nwy(k)) )
	1168	IF ( j > mergp_y ) mergp_y = j
	1169	ENDDO
	1170	DO k = nzb, nzt+1
	1171	j = MAX( ABS(nuz(k)), ABS(nvz(k)), ABS(nwz(k)) )
	1172	IF ( j > mergp_z ) mergp_z = j
	1173	ENDDO
	1174
	1175	mergp_xy = MAX( mergp_x, mergp_y )
	1176
	1177	IF ( ALLOCATED( bux ) ) DEALLOCATE( bux )
	1178	IF ( ALLOCATED( bvx ) ) DEALLOCATE( bvx )
	1179	IF ( ALLOCATED( bwx ) ) DEALLOCATE( bwx )
	1180	IF ( ALLOCATED( buy ) ) DEALLOCATE( buy )
	1181	IF ( ALLOCATED( bvy ) ) DEALLOCATE( bvy )
	1182	IF ( ALLOCATED( bwy ) ) DEALLOCATE( bwy )
	1183	IF ( ALLOCATED( buz ) ) DEALLOCATE( buz )
	1184	IF ( ALLOCATED( bvz ) ) DEALLOCATE( bvz )
	1185	IF ( ALLOCATED( bwz ) ) DEALLOCATE( bwz )
	1186
	1187	ALLOCATE ( bux(-mergp_x:mergp_x,nzb:nzt+1), &
	1188	buy(-mergp_y:mergp_y,nzb:nzt+1), &
	1189	buz(-mergp_z:mergp_z,nzb:nzt+1), &
	1190	bvx(-mergp_x:mergp_x,nzb:nzt+1), &
	1191	bvy(-mergp_y:mergp_y,nzb:nzt+1), &
	1192	bvz(-mergp_z:mergp_z,nzb:nzt+1), &
	1193	bwx(-mergp_x:mergp_x,nzb:nzt+1), &
	1194	bwy(-mergp_y:mergp_y,nzb:nzt+1), &
	1195	bwz(-mergp_z:mergp_z,nzb:nzt+1) )
	1196	!
	1197	!-- Create filter functions
	1198	CALL stg_filter_func( nux, bux, mergp_x ) !filter ux
	1199	CALL stg_filter_func( nuy, buy, mergp_y ) !filter uy
	1200	CALL stg_filter_func( nuz, buz, mergp_z ) !filter uz
	1201	CALL stg_filter_func( nvx, bvx, mergp_x ) !filter vx
	1202	CALL stg_filter_func( nvy, bvy, mergp_y ) !filter vy
	1203	CALL stg_filter_func( nvz, bvz, mergp_z ) !filter vz
	1204	CALL stg_filter_func( nwx, bwx, mergp_x ) !filter wx
	1205	CALL stg_filter_func( nwy, bwy, mergp_y ) !filter wy
	1206	CALL stg_filter_func( nwz, bwz, mergp_z ) !filter wz
	1207
	1208	END SUBROUTINE stg_setup_filter_function
	1209
[4559]	1210	!--------------------------------------------------------------------------------------------------!
[2259]	1211	! Description:
	1212	! ------------
	1213	!> Parin for &stg_par for synthetic turbulence generator
[4559]	1214	!--------------------------------------------------------------------------------------------------!
[2259]	1215	SUBROUTINE stg_parin
	1216
[4842]	1217	CHARACTER(LEN=100) :: line !< dummy string that contains the current line of the parameter file
[2259]	1218
[4842]	1219	INTEGER(iwp) :: io_status !< status after reading the namelist file
[2259]	1220
[4843]	1221	LOGICAL :: switch_off_module = .FALSE. !< local namelist parameter to switch off the module
	1222	!< although the respective module namelist appears in
	1223	!< the namelist file
	1224
	1225	NAMELIST /stg_par/ compute_velocity_seeds_local, &
	1226	dt_stg_adjust, &
[4559]	1227	dt_stg_call, &
[4848]	1228	switch_off_module
[2259]	1229
[4842]	1230
[2259]	1231	!
[4842]	1232	!-- Move to the beginning of the namelist file and try to find and read the namelist.
	1233	REWIND( 11 )
	1234	READ( 11, stg_par, IOSTAT=io_status )
[2259]	1235
	1236	!
[4842]	1237	!-- Action depending on the READ status
	1238	IF ( io_status == 0 ) THEN
	1239	!
	1240	!-- stg_par namelist was found and read correctly. Set flag that indicates that the synthetic
	1241	!-- turbulence generator is switched on.
[4843]	1242	IF ( .NOT. switch_off_module ) syn_turb_gen = .TRUE.
[2259]	1243
[4842]	1244	ELSEIF ( io_status > 0 ) THEN
[2259]	1245	!
[4842]	1246	!-- stg_par namelist was found but contained errors. Print an error message including the line
	1247	!-- that caused the problem.
	1248	BACKSPACE( 11 )
	1249	READ( 11 , '(A)') line
	1250	CALL parin_fail_message( 'stg_par', line )
[2259]	1251
[4842]	1252	ENDIF
[2563]	1253
[2259]	1254	END SUBROUTINE stg_parin
	1255
	1256
[4559]	1257	!--------------------------------------------------------------------------------------------------!
[2259]	1258	! Description:
	1259	! ------------
[4495]	1260	!> Read module-specific global restart data (Fortran binary format).
[4559]	1261	!--------------------------------------------------------------------------------------------------!
[4495]	1262	SUBROUTINE stg_rrd_global_ftn( found )
[2576]	1263
[4559]	1264	LOGICAL, INTENT(OUT) :: found !< flag indicating if variable was found
[2259]	1265
[2894]	1266	found = .TRUE.
[2259]	1267
[3038]	1268
[2894]	1269	SELECT CASE ( restart_string(1:length) )
[4559]	1270
[4022]	1271	CASE ( 'time_stg_adjust' )
	1272	READ ( 13 ) time_stg_adjust
[4559]	1273
[4022]	1274	CASE ( 'time_stg_call' )
	1275	READ ( 13 ) time_stg_call
[4559]	1276
[2894]	1277	CASE DEFAULT
[2259]	1278
[3038]	1279	found = .FALSE.
[2259]	1280
[2894]	1281	END SELECT
[2259]	1282
	1283
[4495]	1284	END SUBROUTINE stg_rrd_global_ftn
[2259]	1285
	1286
[4559]	1287	!--------------------------------------------------------------------------------------------------!
[2259]	1288	! Description:
	1289	! ------------
[4495]	1290	!> Read module-specific global restart data (MPI-IO).
[4559]	1291	!--------------------------------------------------------------------------------------------------!
[4495]	1292	SUBROUTINE stg_rrd_global_mpi
	1293
	1294	CALL rrd_mpi_io( 'time_stg_adjust', time_stg_adjust )
	1295	CALL rrd_mpi_io( 'time_stg_call', time_stg_call )
	1296
	1297	END SUBROUTINE stg_rrd_global_mpi
	1298
	1299
[4559]	1300	!--------------------------------------------------------------------------------------------------!
[4495]	1301	! Description:
	1302	! ------------
[2259]	1303	!> This routine writes the respective restart data.
[4559]	1304	!--------------------------------------------------------------------------------------------------!
[2894]	1305	SUBROUTINE stg_wrd_global
[2259]	1306
[4495]	1307	IF ( TRIM( restart_data_format_output ) == 'fortran_binary' ) THEN
	1308
	1309	CALL wrd_write_string( 'time_stg_adjust' )
	1310	WRITE ( 14 ) time_stg_adjust
[4559]	1311
[4495]	1312	CALL wrd_write_string( 'time_stg_call' )
	1313	WRITE ( 14 ) time_stg_call
[2259]	1314
[4535]	1315	ELSEIF ( restart_data_format_output(1:3) == 'mpi' ) THEN
[2259]	1316
[4495]	1317	CALL wrd_mpi_io( 'time_stg_adjust', time_stg_adjust )
	1318	CALL wrd_mpi_io( 'time_stg_call', time_stg_call )
	1319
	1320	ENDIF
	1321
[2894]	1322	END SUBROUTINE stg_wrd_global
[2259]	1323
[2894]	1324
[4559]	1325	!--------------------------------------------------------------------------------------------------!
[2259]	1326	! Description:
	1327	! ------------
[4559]	1328	!> Create turbulent inflow fields for u, v, w with prescribed length scales and Reynolds stress
	1329	!> tensor after a method of Xie and Castro (2008), modified following suggestions of Kim et al.
	1330	!> (2013), and using a Lund rotation (Lund, 1998).
	1331	!--------------------------------------------------------------------------------------------------!
[2259]	1332	SUBROUTINE stg_main
	1333
[4559]	1334	USE exchange_horiz_mod, &
[4457]	1335	ONLY: exchange_horiz
	1336
[4559]	1337	INTEGER(iwp) :: i !< grid index in x-direction
	1338	INTEGER(iwp) :: j !< loop index in y-direction
	1339	INTEGER(iwp) :: k !< loop index in z-direction
[2259]	1340
[4559]	1341	LOGICAL :: stg_call = .FALSE. !< control flag indicating whether turbulence was updated or only restored from last call
[2259]	1342
[4566]	1343	REAL(wp) :: dt_stg !< time interval the STG is called
[4559]	1344
	1345	REAL(wp), DIMENSION(3) :: mc_factor_l !< local mass flux correction factor
	1346
[3987]	1347	IF ( debug_output_timestep ) CALL debug_message( 'stg_main', 'start' )
[2259]	1348	!
	1349	!-- Calculate time step which is needed for filter functions
[3775]	1350	dt_stg = MAX( dt_3d, dt_stg_call )
[2259]	1351	!
[4559]	1352	!-- Check if synthetic turbulence generator needs to be called and new perturbations need to be
	1353	!-- created or if old disturbances can be imposed again.
	1354	IF ( time_stg_call >= dt_stg_call .AND. &
[4022]	1355	intermediate_timestep_count == intermediate_timestep_count_max ) THEN
	1356	stg_call = .TRUE.
	1357	ELSE
	1358	stg_call = .FALSE.
	1359	ENDIF
	1360	!
[2259]	1361	!-- Initial value of fu, fv, fw
[3646]	1362	IF ( time_since_reference_point == 0.0_wp .AND. .NOT. velocity_seed_initialized ) THEN
[4309]	1363	!
[4559]	1364	!-- Generate turbulence at the left and right boundary. Random numbers for the yz-planes at the
	1365	!-- left/right boundary are generated by the left-sided mpi ranks only. After random numbers are
	1366	!-- calculated, they are distributed to all other mpi ranks in the model, so that the velocity
	1367	!-- seed matrices are available on all mpi ranks (i.e. also on the right-sided boundary mpi ranks).
	1368	!-- In case of offline nesting, this implies, that the left- and the right-sided lateral boundary
	1369	!-- have the same initial seeds.
	1370	!-- Note, in case of inflow from the right only, only turbulence at the left boundary is required.
	1371	IF ( .NOT. ( nesting_offline .OR. ( child_domain .AND. rans_mode_parent &
	1372	.AND. .NOT. rans_mode ) ) ) THEN
[4309]	1373	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fu_yz, id_stg_left )
	1374	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fv_yz, id_stg_left )
	1375	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fw_yz, id_stg_left )
	1376	ELSE
[4559]	1377	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fu_yz, id_stg_left, id_stg_right )
	1378	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fv_yz, id_stg_left, id_stg_right )
	1379	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fw_yz, id_stg_left, id_stg_right )
[2938]	1380	!
[4559]	1381	!-- Generate turbulence at the south and north boundary. Random numbers for the xz-planes at
	1382	!-- the south/north boundary are generated by the south-sided mpi ranks only. Please see also
	1383	!-- comment above.
	1384	CALL stg_generate_seed_xz( nux, nuz, bux, buz, fu_xz, id_stg_south, id_stg_north )
	1385	CALL stg_generate_seed_xz( nvx, nvz, bvx, bvz, fv_xz, id_stg_south, id_stg_north )
	1386	CALL stg_generate_seed_xz( nwx, nwz, bwx, bwz, fw_xz, id_stg_south, id_stg_north )
[2938]	1387	ENDIF
[2259]	1388	velocity_seed_initialized = .TRUE.
	1389	ENDIF
	1390	!
[4559]	1391	!-- New set of fu, fv, fw. Note, for inflow from the left side only, velocity seeds are only
	1392	!-- required at the left boundary, while in case of offline nesting or RANS-LES nesting velocity
	1393	!-- seeds are required also at the right, south and north boundaries.
[4022]	1394	IF ( stg_call ) THEN
[4559]	1395	IF ( .NOT. ( nesting_offline .OR. &
	1396	( child_domain .AND. rans_mode_parent &
[4309]	1397	.AND. .NOT. rans_mode ) ) ) THEN
	1398	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fuo_yz, id_stg_left )
	1399	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fvo_yz, id_stg_left )
	1400	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fwo_yz, id_stg_left )
	1401
	1402	ELSE
[4559]	1403	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fuo_yz, id_stg_left, id_stg_right )
	1404	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fvo_yz, id_stg_left, id_stg_right )
	1405	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fwo_yz, id_stg_left, id_stg_right )
[4309]	1406
[4559]	1407	CALL stg_generate_seed_xz( nux, nuz, bux, buz, fuo_xz, id_stg_south, id_stg_north )
	1408	CALL stg_generate_seed_xz( nvx, nvz, bvx, bvz, fvo_xz, id_stg_south, id_stg_north )
	1409	CALL stg_generate_seed_xz( nwx, nwz, bwx, bwz, fwo_xz, id_stg_south, id_stg_north )
[4022]	1410	ENDIF
[2938]	1411	ENDIF
[4559]	1412
[2938]	1413	!
[4309]	1414	!-- Turbulence generation at left and/or right boundary
[2938]	1415	IF ( myidx == id_stg_left .OR. myidx == id_stg_right ) THEN
[2259]	1416	!
[4559]	1417	!-- Calculate new set of perturbations. Do this only at last RK3-substep and when dt_stg_call is
	1418	!-- exceeded. Else the old set of perturbations is imposed
[4022]	1419	IF ( stg_call ) THEN
[4559]	1420
[4438]	1421	DO j = nys, nyn
[4022]	1422	DO k = nzb, nzt + 1
[4559]	1423	!
[4022]	1424	!-- Update fu, fv, fw following Eq. 14 of Xie and Castro (2008)
[4566]	1425	IF ( tu(k) == 0.0_wp .OR. adjustment_step ) THEN
[4022]	1426	fu_yz(k,j) = fuo_yz(k,j)
	1427	ELSE
[4559]	1428	fu_yz(k,j) = fu_yz(k,j) * EXP( -pi * dt_stg * 0.5_wp / tu(k) ) + &
	1429	fuo_yz(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tu(k) ) )
[4022]	1430	ENDIF
[4559]	1431
[4566]	1432	IF ( tv(k) == 0.0_wp .OR. adjustment_step ) THEN
[4022]	1433	fv_yz(k,j) = fvo_yz(k,j)
	1434	ELSE
[4559]	1435	fv_yz(k,j) = fv_yz(k,j) * EXP( -pi * dt_stg * 0.5_wp / tv(k) ) + &
	1436	fvo_yz(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tv(k) ) )
[4022]	1437	ENDIF
[4559]	1438
[4566]	1439	IF ( tw(k) == 0.0_wp .OR. adjustment_step ) THEN
[4022]	1440	fw_yz(k,j) = fwo_yz(k,j)
	1441	ELSE
[4559]	1442	fw_yz(k,j) = fw_yz(k,j) * EXP( -pi * dt_stg * 0.5_wp / tw(k) ) + &
	1443	fwo_yz(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tw(k) ) )
[4022]	1444	ENDIF
	1445	ENDDO
	1446	ENDDO
[4559]	1447
[4022]	1448	dist_yz(nzb,:,1) = 0.0_wp
	1449	dist_yz(nzb,:,2) = 0.0_wp
	1450	dist_yz(nzb,:,3) = 0.0_wp
[4559]	1451
[4022]	1452	IF ( myidx == id_stg_left ) i = nxl
[4559]	1453	IF ( myidx == id_stg_right ) i = nxr+1
[4438]	1454	DO j = nys, nyn
[4022]	1455	DO k = nzb+1, nzt + 1
[4559]	1456	!
[4022]	1457	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
[4566]	1458	dist_yz(k,j,1) = a11(k) * fu_yz(k,j) * &
[4562]	1459	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 1 ) )
[4566]	1460
[4022]	1461	ENDDO
	1462	ENDDO
[4309]	1463
[4022]	1464	IF ( myidx == id_stg_left ) i = nxl-1
	1465	IF ( myidx == id_stg_right ) i = nxr+1
[4438]	1466	DO j = nys, nyn
[4022]	1467	DO k = nzb+1, nzt + 1
[4559]	1468	!
[4022]	1469	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
[4559]	1470	!-- Additional factors are added to improve the variance of v and w experimental test
	1471	!-- of 1.2
[4566]	1472	dist_yz(k,j,2) = ( a21(k) * fu_yz(k,j) + a22(k) * fv_yz(k,j) ) * &
[4559]	1473	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 2 ) )
[4566]	1474	dist_yz(k,j,3) = ( a31(k) * fu_yz(k,j) + a32(k) * fv_yz(k,j) + &
	1475	a33(k) * fw_yz(k,j) ) * &
	1476	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 3 ) )
	1477
[4022]	1478	ENDDO
[2259]	1479	ENDDO
[4022]	1480	ENDIF
[2259]	1481	!
	1482	!-- Mass flux correction following Kim et al. (2013)
[4559]	1483	!-- This correction factor ensures that the mass flux is preserved at the inflow boundary. First,
	1484	!-- calculate mean value of the imposed perturbations at yz boundary. Note, this needs to be done
	1485	!-- only after the last RK3-substep, else the boundary values won't be accessed.
[4022]	1486	IF ( intermediate_timestep_count == intermediate_timestep_count_max ) THEN
[4559]	1487	mc_factor_l = 0.0_wp
	1488	mc_factor = 0.0_wp
	1489	!
	1490	!-- Sum up the original volume flows (with and without perturbations).
	1491	!-- Note, for non-normal components (here v and w) it is actually no volume flow.
[2938]	1492	IF ( myidx == id_stg_left ) i = nxl
	1493	IF ( myidx == id_stg_right ) i = nxr+1
[4559]	1494
[4562]	1495	mc_factor_l(1) = SUM( dist_yz(nzb:nzt,nys:nyn,1) * &
	1496	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzb:nzt,nys:nyn,i), 1 ) ) )
[4559]	1497
[4022]	1498	IF ( myidx == id_stg_left ) i = nxl-1
	1499	IF ( myidx == id_stg_right ) i = nxr+1
[4559]	1500
[4562]	1501	mc_factor_l(2) = SUM( dist_yz(nzb:nzt,nysv:nyn,2) * &
	1502	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzb:nzt,nysv:nyn,i), 2 ) ) )
	1503	mc_factor_l(3) = SUM( dist_yz(nzb:nzt,nys:nyn,3) * &
	1504	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzb:nzt,nys:nyn,i), 3 ) ) )
[4559]	1505
[2938]	1506	#if defined( __parallel )
[4559]	1507	CALL MPI_ALLREDUCE( mc_factor_l, mc_factor, 3, MPI_REAL, MPI_SUM, comm1dy, ierr )
	1508	#else
	1509	mc_factor = mc_factor_l
[2938]	1510	#endif
[4559]	1511	!
	1512	!-- Calculate correction factor and force zero mean perturbations.
	1513	mc_factor = mc_factor / REAL( nr_non_topo_yz, KIND = wp )
	1514
	1515	IF ( myidx == id_stg_left ) i = nxl
	1516	IF ( myidx == id_stg_right ) i = nxr+1
	1517
[4562]	1518	dist_yz(:,nys:nyn,1) = ( dist_yz(:,nys:nyn,1) - mc_factor(1) ) * &
	1519	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(:,nys:nyn,i), 1 ) )
[4559]	1520
	1521
	1522	IF ( myidx == id_stg_left ) i = nxl-1
	1523	IF ( myidx == id_stg_right ) i = nxr+1
	1524
[4562]	1525	dist_yz(:,nys:nyn,2) = ( dist_yz(:,nys:nyn,2) - mc_factor(2) ) * &
	1526	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(:,nys:nyn,i), 2 ) )
[4559]	1527
[4562]	1528	dist_yz(:,nys:nyn,3) = ( dist_yz(:,nys:nyn,3) - mc_factor(3) ) * &
	1529	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(:,nys:nyn,i), 3 ) )
[4559]	1530	!
[2938]	1531	!-- Add disturbances
	1532	IF ( myidx == id_stg_left ) THEN
[4559]	1533	!
	1534	!-- For the left boundary distinguish between mesoscale offline / self nesting and
	1535	!-- turbulent inflow at the left boundary only. In the latter case turbulence is imposed on
	1536	!-- the mean inflow profiles.
	1537	IF ( .NOT. nesting_offline .AND. .NOT. child_domain ) THEN
	1538	!
[4022]	1539	!-- Add disturbance at the inflow
[4438]	1540	DO j = nys, nyn
[4022]	1541	DO k = nzb, nzt+1
[4562]	1542	u(k,j,-nbgp+1:0) = ( mean_inflow_profiles(k,1) + dist_yz(k,j,1) ) * &
	1543	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,0), 1 ) )
	1544	v(k,j,-nbgp:-1) = ( mean_inflow_profiles(k,2) + dist_yz(k,j,2) ) * &
	1545	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,-1), 2 ) )
	1546	w(k,j,-nbgp:-1) = dist_yz(k,j,3) * &
	1547	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,-1), 3 ) )
[4022]	1548	ENDDO
[2938]	1549	ENDDO
[4022]	1550	ELSE
[4559]	1551
[4022]	1552	DO j = nys, nyn
	1553	DO k = nzb+1, nzt
[4562]	1554	u(k,j,0) = ( u(k,j,0) + dist_yz(k,j,1) ) * &
	1555	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,0), 1 ) )
[4022]	1556	u(k,j,-1) = u(k,j,0)
[4562]	1557	v(k,j,-1) = ( v(k,j,-1) + dist_yz(k,j,2) ) * &
	1558	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,-1), 2 ) )
	1559	w(k,j,-1) = ( w(k,j,-1) + dist_yz(k,j,3) ) * &
	1560	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,-1), 3 ) )
[4022]	1561	ENDDO
	1562	ENDDO
	1563	ENDIF
[2938]	1564	ENDIF
	1565	IF ( myidx == id_stg_right ) THEN
[3186]	1566	DO j = nys, nyn
[3347]	1567	DO k = nzb+1, nzt
[4562]	1568	u(k,j,nxr+1) = ( u(k,j,nxr+1) + dist_yz(k,j,1) ) * &
	1569	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,nxr+1), 1 ) )
	1570	v(k,j,nxr+1) = ( v(k,j,nxr+1) + dist_yz(k,j,2) ) * &
	1571	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,nxr+1), 2 ) )
	1572	w(k,j,nxr+1) = ( w(k,j,nxr+1) + dist_yz(k,j,3) ) * &
	1573	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,nxr+1), 3 ) )
[2938]	1574	ENDDO
	1575	ENDDO
	1576	ENDIF
	1577	ENDIF
	1578	ENDIF
	1579	!
	1580	!-- Turbulence generation at north and south boundary
	1581	IF ( myidy == id_stg_north .OR. myidy == id_stg_south ) THEN
	1582	!
[4559]	1583	!-- Calculate new set of perturbations. Do this only at last RK3-substep and when dt_stg_call is
	1584	!-- exceeded. Else the old set of perturbations is imposed
[4022]	1585	IF ( stg_call ) THEN
[4438]	1586	DO i = nxl, nxr
[4022]	1587	DO k = nzb, nzt + 1
[4559]	1588	!
[4022]	1589	!-- Update fu, fv, fw following Eq. 14 of Xie and Castro (2008)
[4566]	1590	IF ( tu(k) == 0.0_wp .OR. adjustment_step ) THEN
[4022]	1591	fu_xz(k,i) = fuo_xz(k,i)
	1592	ELSE
[4559]	1593	fu_xz(k,i) = fu_xz(k,i) * EXP( -pi * dt_stg * 0.5_wp / tu(k) ) + &
	1594	fuo_xz(k,i) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tu(k) ) )
[4022]	1595	ENDIF
[4559]	1596
[4566]	1597	IF ( tv(k) == 0.0_wp .OR. adjustment_step ) THEN
[4022]	1598	fv_xz(k,i) = fvo_xz(k,i)
	1599	ELSE
[4559]	1600	fv_xz(k,i) = fv_xz(k,i) * EXP( -pi * dt_stg * 0.5_wp / tv(k) ) + &
	1601	fvo_xz(k,i) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tv(k) ) )
[4022]	1602	ENDIF
[4559]	1603
[4566]	1604	IF ( tw(k) == 0.0_wp .OR. adjustment_step ) THEN
[4022]	1605	fw_xz(k,i) = fwo_xz(k,i)
	1606	ELSE
[4559]	1607	fw_xz(k,i) = fw_xz(k,i) * EXP( -pi * dt_stg * 0.5_wp / tw(k) ) + &
	1608	fwo_xz(k,i) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tw(k) ) )
[4022]	1609	ENDIF
	1610	ENDDO
	1611	ENDDO
[4559]	1612
	1613
[4022]	1614	dist_xz(nzb,:,1) = 0.0_wp
	1615	dist_xz(nzb,:,2) = 0.0_wp
	1616	dist_xz(nzb,:,3) = 0.0_wp
[4559]	1617
[4022]	1618	IF ( myidy == id_stg_south ) j = nys
	1619	IF ( myidy == id_stg_north ) j = nyn+1
[4438]	1620	DO i = nxl, nxr
[4022]	1621	DO k = nzb+1, nzt + 1
[4559]	1622	!
[4022]	1623	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
[4559]	1624	!-- Additional factors are added to improve the variance of v and w
	1625	!experimental test of 1.2
[4566]	1626	dist_xz(k,i,2) = ( a21(k) * fu_xz(k,i) + a22(k) * fv_xz(k,i) ) * &
[4559]	1627	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 2 ) )
[4022]	1628	ENDDO
	1629	ENDDO
[4559]	1630
[4022]	1631	IF ( myidy == id_stg_south ) j = nys-1
	1632	IF ( myidy == id_stg_north ) j = nyn+1
[4438]	1633	DO i = nxl, nxr
[4022]	1634	DO k = nzb+1, nzt + 1
[4559]	1635	!
[4022]	1636	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
	1637	!-- Additional factors are added to improve the variance of v and w
[4566]	1638	dist_xz(k,i,1) = a11(k) * fu_xz(k,i) * &
[4562]	1639	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 1 ) )
[4559]	1640
[4566]	1641	dist_xz(k,i,3) = ( a31(k) * fu_xz(k,i) + a32(k) * fv_xz(k,i) + &
	1642	a33(k) * fw_xz(k,i) ) * &
[4562]	1643	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 3 ) )
[4022]	1644	ENDDO
[2938]	1645	ENDDO
[4022]	1646	ENDIF
[3347]	1647
[2938]	1648	!
[4559]	1649	!-- Mass flux correction following Kim et al. (2013). This correction factor ensures that the
	1650	!-- mass flux is preserved at the inflow boundary. First, calculate mean value of the imposed
	1651	!-- perturbations at yz boundary. Note, this needs to be done only after the last RK3-substep,
	1652	!-- else the boundary values won't be accessed.
[4022]	1653	IF ( intermediate_timestep_count == intermediate_timestep_count_max ) THEN
[4559]	1654	mc_factor_l = 0.0_wp
	1655	mc_factor = 0.0_wp
	1656
[4022]	1657	IF ( myidy == id_stg_south ) j = nys
	1658	IF ( myidy == id_stg_north ) j = nyn+1
[4559]	1659
[4562]	1660	mc_factor_l(2) = SUM( dist_xz(nzb:nzt,nxl:nxr,2) * &
	1661	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzb:nzt,j,nxl:nxr), 2 ) ) )
[4559]	1662
	1663	IF ( myidy == id_stg_south ) j = nys-1
	1664	IF ( myidy == id_stg_north ) j = nyn+1
	1665
[4562]	1666	mc_factor_l(1) = SUM( dist_xz(nzb:nzt,nxlu:nxr,1) * &
	1667	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzb:nzt,j,nxlu:nxr), 1 ) ) )
	1668	mc_factor_l(3) = SUM( dist_xz(nzb:nzt,nxl:nxr,3) * &
	1669	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzb:nzt,j,nxl:nxr), 3 ) ) )
[4559]	1670
[2938]	1671	#if defined( __parallel )
[4559]	1672	CALL MPI_ALLREDUCE( mc_factor_l, mc_factor, 3, MPI_REAL, MPI_SUM, comm1dx, ierr )
	1673	#else
[4022]	1674	mc_factor = mc_factor_l
[2938]	1675	#endif
[4559]	1676
[4022]	1677	mc_factor = mc_factor / REAL( nr_non_topo_xz, KIND = wp )
[4559]	1678
	1679	IF ( myidy == id_stg_south ) j = nys
	1680	IF ( myidy == id_stg_north ) j = nyn+1
	1681
[4562]	1682	dist_xz(:,nxl:nxr,2) = ( dist_xz(:,nxl:nxr,2) - mc_factor(2) ) * &
	1683	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(:,j,nxl:nxr), 2 ) )
[4559]	1684
	1685
	1686	IF ( myidy == id_stg_south ) j = nys-1
	1687	IF ( myidy == id_stg_north ) j = nyn+1
	1688
[4562]	1689	dist_xz(:,nxl:nxr,1) = ( dist_xz(:,nxl:nxr,1) - mc_factor(1) ) * &
	1690	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(:,j,nxl:nxr), 1 ) )
[4559]	1691
[4562]	1692	dist_xz(:,nxl:nxr,3) = ( dist_xz(:,nxl:nxr,3) - mc_factor(3) ) * &
	1693	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(:,j,nxl:nxr), 3 ) )
[4559]	1694	!
[4022]	1695	!-- Add disturbances
[4559]	1696	IF ( myidy == id_stg_south ) THEN
[4022]	1697	DO i = nxl, nxr
	1698	DO k = nzb+1, nzt
[4559]	1699	u(k,-1,i) = ( u(k,-1,i) + dist_xz(k,i,1) ) &
	1700	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,-1,i), 1 ) )
	1701	v(k,0,i) = ( v(k,0,i) + dist_xz(k,i,2) ) &
	1702	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,0,i), 2 ) )
[4022]	1703	v(k,-1,i) = v(k,0,i)
[4559]	1704	w(k,-1,i) = ( w(k,-1,i) + dist_xz(k,i,3) ) &
	1705	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,-1,i), 3 ) )
[4022]	1706	ENDDO
[2938]	1707	ENDDO
[4022]	1708	ENDIF
	1709	IF ( myidy == id_stg_north ) THEN
[4559]	1710
[4022]	1711	DO i = nxl, nxr
	1712	DO k = nzb+1, nzt
[4562]	1713	u(k,nyn+1,i) = ( u(k,nyn+1,i) + dist_xz(k,i,1) ) * &
	1714	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,nyn+1,i), 1 ) )
	1715	v(k,nyn+1,i) = ( v(k,nyn+1,i) + dist_xz(k,i,2) ) * &
	1716	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,nyn+1,i), 2 ) )
	1717	w(k,nyn+1,i) = ( w(k,nyn+1,i) + dist_xz(k,i,3) ) * &
	1718	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,nyn+1,i), 3 ) )
[4022]	1719	ENDDO
[2938]	1720	ENDDO
[4022]	1721	ENDIF
[2938]	1722	ENDIF
[2259]	1723	ENDIF
[3347]	1724	!
[4438]	1725	!-- Exchange ghost points.
	1726	CALL exchange_horiz( u, nbgp )
	1727	CALL exchange_horiz( v, nbgp )
	1728	CALL exchange_horiz( w, nbgp )
	1729	!
[3347]	1730	!-- Finally, set time counter for calling STG to zero
[4022]	1731	IF ( stg_call ) time_stg_call = 0.0_wp
[4566]	1732	!
	1733	!-- Set adjustment step to False to indicate that time correlation can be
	1734	!-- switched-on again.
	1735	adjustment_step = .FALSE.
[2259]	1736
[3987]	1737	IF ( debug_output_timestep ) CALL debug_message( 'stg_main', 'end' )
	1738
[2259]	1739	END SUBROUTINE stg_main
	1740
[4559]	1741	!--------------------------------------------------------------------------------------------------!
[2259]	1742	! Description:
	1743	! ------------
[4559]	1744	!> Generate a set of random number rand_it wich is equal on each PE and calculate the velocity seed
	1745	!> f_n. f_n is splitted in vertical direction by the number of PEs in x-direction and each PE
	1746	!> calculates a vertical subsection of f_n. At the the end, all parts are collected to form the full
	1747	!> array.
	1748	!--------------------------------------------------------------------------------------------------!
[4309]	1749	SUBROUTINE stg_generate_seed_yz( n_y, n_z, b_y, b_z, f_n, id_left, id_right )
[2259]	1750
[4559]	1751	INTEGER(iwp) :: id_left !< core ids at respective boundaries
	1752	INTEGER(iwp), OPTIONAL :: id_right !< core ids at respective boundaries
	1753	INTEGER(iwp) :: j !< loop index in y-direction
	1754	INTEGER(iwp) :: jj !< loop index in y-direction
	1755	INTEGER(iwp) :: k !< loop index in z-direction
	1756	INTEGER(iwp) :: kk !< loop index in z-direction
	1757	INTEGER(iwp) :: send_count !< send count for MPI_GATHERV
[2259]	1758
[4559]	1759	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y !< length scale in y-direction
	1760	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z !< length scale in z-direction
[2259]	1761
[4559]	1762	REAL(wp) :: nyz_inv !< inverse of number of grid points in yz-slice
	1763	REAL(wp) :: rand_av !< average of random number
	1764	REAL(wp) :: rand_sigma_inv !< inverse of stdev of random number
[2259]	1765
[4566]	1766	REAL(wp), DIMENSION(-mergp_y:mergp_y,nzb:nzt+1) :: b_y !< filter function in y-direction
	1767	REAL(wp), DIMENSION(-mergp_z:mergp_z,nzb:nzt+1) :: b_z !< filter function in z-direction
[4559]	1768
	1769	REAL(wp), DIMENSION(nzb_x_stg:nzt_x_stg+1,nys:nyn) :: f_n_l !< local velocity seed
	1770	REAL(wp), DIMENSION(nzb:nzt+1,nys:nyn) :: f_n !< velocity seed
	1771
	1772	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: rand_it !< global array of random numbers
[2259]	1773	!
[4559]	1774	!-- Generate random numbers using the parallel random generator. The set of random numbers are
	1775	!-- modified to have an average of 0 and unit variance. Note, at the end the random number array
	1776	!-- must be defined globally in order to compute the correlation matrices. However, the calculation
	1777	!-- and normalization of random numbers is done locally, while the result is later distributed to
[4566]	1778	!-- all processes. Further, please note, a set of random numbers is only calculated for the west
	1779	!-- boundary, while the east boundary uses the same random numbers and thus also computes the same
[4559]	1780	!-- correlation matrix.
[4566]	1781	ALLOCATE( rand_it(nzb-mergp_z:nzt+1+mergp_z,-mergp_y+nys:nyn+mergp_y) )
[4438]	1782	rand_it = 0.0_wp
[2259]	1783
	1784	rand_av = 0.0_wp
	1785	rand_sigma_inv = 0.0_wp
[4566]	1786	nyz_inv = 1.0_wp / REAL( ( nzt + 1 + mergp_z - ( nzb - mergp_z ) + 1 ) &
	1787	* ( ny + mergp_y - ( 0 - mergp_y ) + 1 ), KIND = wp )
[4309]	1788	!
[4438]	1789	!-- Compute and normalize random numbers.
[4566]	1790	DO j = nys - mergp_y, nyn + mergp_y
[4309]	1791	!
[4438]	1792	!-- Put the random seeds at grid point j
	1793	CALL random_seed_parallel( put=seq_rand_yz(:,j) )
[4566]	1794	DO k = nzb - mergp_z, nzt + 1 + mergp_z
[4438]	1795	CALL random_number_parallel( random_dummy )
	1796	rand_it(k,j) = random_dummy
	1797	ENDDO
[4309]	1798	!
[4438]	1799	!-- Get the new random seeds from last call at grid point j
	1800	CALL random_seed_parallel( get=seq_rand_yz(:,j) )
	1801	ENDDO
[4309]	1802	!
[4559]	1803	!-- For normalization to zero mean, sum-up the global random numers. To normalize the global set of
	1804	!-- random numbers, the inner ghost layers mergp must not be summed-up, else the random numbers on
	1805	!-- the ghost layers will be stronger weighted as they also occur on the inner subdomains.
[4566]	1806	DO j = MERGE( nys, nys - mergp_y, nys /= 0 ), MERGE( nyn, nyn + mergp_y, nyn /= ny )
	1807	DO k = nzb - mergp_z, nzt + 1 + mergp_z
[4438]	1808	rand_av = rand_av + rand_it(k,j)
[2259]	1809	ENDDO
[4438]	1810	ENDDO
[4842]	1811
[4309]	1812	#if defined( __parallel )
	1813	!
[4438]	1814	!-- Sum-up the local averages of the random numbers
[4559]	1815	CALL MPI_ALLREDUCE( MPI_IN_PLACE, rand_av, 1, MPI_REAL, MPI_SUM, comm1dy, ierr )
[4309]	1816	#endif
[4438]	1817	rand_av = rand_av * nyz_inv
[4309]	1818	!
[4438]	1819	!-- Obtain zero mean
	1820	rand_it= rand_it - rand_av
[4309]	1821	!
[4438]	1822	!-- Now, compute the variance
[4566]	1823	DO j = MERGE( nys, nys - mergp_y, nys /= 0 ), MERGE( nyn, nyn + mergp_y, nyn /= ny )
	1824	DO k = nzb - mergp_z, nzt + 1 + mergp_z
[4438]	1825	rand_sigma_inv = rand_sigma_inv + rand_it(k,j)**2
[2259]	1826	ENDDO
[4438]	1827	ENDDO
[2259]	1828
[4309]	1829	#if defined( __parallel )
[2259]	1830	!
[4438]	1831	!-- Sum-up the local quadratic averages of the random numbers
[4559]	1832	CALL MPI_ALLREDUCE( MPI_IN_PLACE, rand_sigma_inv, 1, MPI_REAL, MPI_SUM, comm1dy, ierr )
[4309]	1833	#endif
	1834	!
[4438]	1835	!-- Compute standard deviation
	1836	IF ( rand_sigma_inv /= 0.0_wp ) THEN
	1837	rand_sigma_inv = 1.0_wp / SQRT( rand_sigma_inv * nyz_inv )
	1838	ELSE
	1839	rand_sigma_inv = 1.0_wp
[4309]	1840	ENDIF
	1841	!
[4438]	1842	!-- Normalize with standard deviation to obtain unit variance
	1843	rand_it = rand_it * rand_sigma_inv
	1844
	1845	CALL cpu_log( log_point_s(31), 'STG f_n factors', 'start' )
[4309]	1846	!
[4559]	1847	!-- Generate velocity seed following Eq.6 of Xie and Castro (2008). There are two options. In the
	1848	!-- first one, the computation of the seeds is distributed to all processes along the communicator
	1849	!-- comm1dy and gathered on the leftmost and, if necessary, on the rightmost process. For huge
	1850	!-- length scales the computational effort can become quite huge (it scales with the turbulent
	1851	!-- length scales), so that gain by parallelization exceeds the costs by the subsequent
	1852	!-- communication. In the second option, which performs better when the turbulent length scales
	1853	!-- are parametrized and thus the loops are smaller, the seeds are computed locally and no
	1854	!-- communication is necessary.
[4438]	1855	IF ( compute_velocity_seeds_local ) THEN
	1856
	1857	f_n = 0.0_wp
	1858	DO j = nys, nyn
	1859	DO k = nzb, nzt+1
	1860	DO jj = -n_y(k), n_y(k)
	1861	DO kk = -n_z(k), n_z(k)
	1862	f_n(k,j) = f_n(k,j) + b_y(jj,k) * b_z(kk,k) * rand_it(k+kk,j+jj)
	1863	ENDDO
	1864	ENDDO
	1865	ENDDO
[2259]	1866	ENDDO
	1867
[4438]	1868	ELSE
[2259]	1869
[4438]	1870	f_n_l = 0.0_wp
	1871	DO j = nys, nyn
	1872	DO k = nzb_x_stg, nzt_x_stg+1
	1873	DO jj = -n_y(k), n_y(k)
	1874	DO kk = -n_z(k), n_z(k)
	1875	f_n_l(k,j) = f_n_l(k,j) + b_y(jj,k) * b_z(kk,k) * rand_it(k+kk,j+jj)
	1876	ENDDO
[2259]	1877	ENDDO
	1878	ENDDO
	1879	ENDDO
	1880	!
[4438]	1881	!-- Gather velocity seeds of full subdomain
	1882	send_count = nzt_x_stg - nzb_x_stg + 1
	1883	IF ( nzt_x_stg == nzt ) send_count = send_count + 1
[2259]	1884
	1885	#if defined( __parallel )
[4309]	1886	!
[4438]	1887	!-- Gather the velocity seed matrix on left boundary mpi ranks.
[4559]	1888	CALL MPI_GATHERV( f_n_l(nzb_x_stg,nys), send_count, stg_type_yz_small, f_n(nzb+1,nys), &
	1889	recv_count_yz, displs_yz, stg_type_yz, id_left, comm1dx, ierr )
[4309]	1890	!
[4559]	1891	!-- If required, gather the same velocity seed matrix on right boundary mpi ranks (in offline
	1892	!-- nesting for example).
[4438]	1893	IF ( PRESENT( id_right ) ) THEN
[4559]	1894	CALL MPI_GATHERV( f_n_l(nzb_x_stg,nys), send_count, stg_type_yz_small, f_n(nzb+1,nys), &
	1895	recv_count_yz, displs_yz, stg_type_yz, id_right, comm1dx, ierr )
[4438]	1896	ENDIF
[2259]	1897	#else
[4438]	1898	f_n(nzb+1:nzt+1,nys:nyn) = f_n_l(nzb_x_stg:nzt_x_stg+1,nys:nyn)
[4444]	1899	!
	1900	!-- Next line required to avoid compile errors because of unused dummy arguments
	1901	IF ( id_left == 0 ) id_right = 0
[2259]	1902	#endif
	1903
[4438]	1904	ENDIF
[2259]	1905
[4438]	1906	DEALLOCATE( rand_it )
	1907
	1908	CALL cpu_log( log_point_s(31), 'STG f_n factors', 'stop' )
	1909
[2259]	1910	END SUBROUTINE stg_generate_seed_yz
	1911
[2938]	1912
[4559]	1913	!--------------------------------------------------------------------------------------------------!
[2938]	1914	! Description:
	1915	! ------------
[4559]	1916	!> Generate a set of random number rand_it wich is equal on each PE and calculate the velocity seed
	1917	!> f_n.
	1918	!> f_n is splitted in vertical direction by the number of PEs in y-direction and and each PE
	1919	!> calculates a vertical subsection of f_n. At the the end, all parts are collected to form the
	1920	!> full array.
	1921	!--------------------------------------------------------------------------------------------------!
[4309]	1922	SUBROUTINE stg_generate_seed_xz( n_x, n_z, b_x, b_z, f_n, id_south, id_north )
[2938]	1923
[4566]	1924	INTEGER(iwp) :: i !< loop index in x-direction
	1925	INTEGER(iwp) :: id_north !< core ids at respective boundaries
	1926	INTEGER(iwp) :: id_south !< core ids at respective boundaries
	1927	INTEGER(iwp) :: ii !< loop index in x-direction
	1928	INTEGER(iwp) :: k !< loop index in z-direction
	1929	INTEGER(iwp) :: kk !< loop index in z-direction
	1930	INTEGER(iwp) :: send_count !< send count for MPI_GATHERV
[2938]	1931
[4566]	1932	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_x !< length scale in x-direction
	1933	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z !< length scale in z-direction
[2938]	1934
[4566]	1935	REAL(wp) :: nxz_inv !< inverse of number of grid points in xz-slice
	1936	REAL(wp) :: rand_av !< average of random number
	1937	REAL(wp) :: rand_sigma_inv !< inverse of stdev of random number
[2938]	1938
[4566]	1939	REAL(wp), DIMENSION(-mergp_x:mergp_x,nzb:nzt+1) :: b_x !< filter function in x-direction
	1940	REAL(wp), DIMENSION(-mergp_z:mergp_z,nzb:nzt+1) :: b_z !< filter function in z-direction
[4842]	1941
[4566]	1942	REAL(wp), DIMENSION(nzb_y_stg:nzt_y_stg+1,nxl:nxr) :: f_n_l !< local velocity seed
	1943	REAL(wp), DIMENSION(nzb:nzt+1,nxl:nxr) :: f_n !< velocity seed
[2938]	1944
[4566]	1945	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: rand_it !< global array of random numbers
[2938]	1946
	1947	!
[4559]	1948	!-- Generate random numbers using the parallel random generator. The set of random numbers are
	1949	!-- modified to have an average of 0 and unit variance. Note, at the end the random number array
	1950	!-- must be defined globally in order to compute the correlation matrices. However, the calculation
	1951	!-- and normalization of random numbers is done locally, while the result is later distributed to
[4566]	1952	!-- all processes. Further, please note, a set of random numbers is only calculated for the south
	1953	!-- boundary, while the north boundary uses the same random numbers and thus also computes the same
[4559]	1954	!-- correlation matrix.
[4566]	1955	ALLOCATE( rand_it(nzb-mergp_z:nzt+1+mergp_z,-mergp_x+nxl:nxr+mergp_x) )
[4438]	1956	rand_it = 0.0_wp
[2938]	1957
	1958	rand_av = 0.0_wp
	1959	rand_sigma_inv = 0.0_wp
[4566]	1960	nxz_inv = 1.0_wp / REAL( ( nzt + 1 + mergp_z - ( nzb - mergp_z ) + 1 ) &
	1961	* ( nx + mergp_x - ( 0 - mergp_x ) +1 ), KIND = wp )
[4309]	1962	!
[4438]	1963	!-- Compute and normalize random numbers.
[4566]	1964	DO i = nxl - mergp_x, nxr + mergp_x
[4309]	1965	!
[4438]	1966	!-- Put the random seeds at grid point ii
	1967	CALL random_seed_parallel( put=seq_rand_xz(:,i) )
[4566]	1968	DO k = nzb - mergp_z, nzt + 1 + mergp_z
[4438]	1969	CALL random_number_parallel( random_dummy )
	1970	rand_it(k,i) = random_dummy
	1971	ENDDO
[4309]	1972	!
[4438]	1973	!-- Get the new random seeds from last call at grid point ii
	1974	CALL random_seed_parallel( get=seq_rand_xz(:,i) )
	1975	ENDDO
[4309]	1976	!
[4438]	1977	!-- For normalization to zero mean, sum-up the global random numers.
[4559]	1978	!-- To normalize the global set of random numbers, the inner ghost layers mergp must not be
	1979	!-- summed-up, else the random numbers on the ghost layers will be stronger weighted as they
[4438]	1980	!-- also occur on the inner subdomains.
[4566]	1981	DO i = MERGE( nxl, nxl - mergp_x, nxl /= 0 ), MERGE( nxr, nxr + mergp_x, nxr /= nx )
	1982	DO k = nzb - mergp_z, nzt + 1 + mergp_z
[4438]	1983	rand_av = rand_av + rand_it(k,i)
[2938]	1984	ENDDO
[4438]	1985	ENDDO
[4842]	1986
[4309]	1987	#if defined( __parallel )
[4438]	1988	!
	1989	!-- Sum-up the local averages of the random numbers
[4559]	1990	CALL MPI_ALLREDUCE( MPI_IN_PLACE, rand_av, 1, MPI_REAL, MPI_SUM, comm1dx, ierr )
[4309]	1991	#endif
[4438]	1992	rand_av = rand_av * nxz_inv
[4309]	1993	!
[4438]	1994	!-- Obtain zero mean
	1995	rand_it= rand_it - rand_av
[4309]	1996	!
[4438]	1997	!-- Now, compute the variance
[4566]	1998	DO i = MERGE( nxl, nxl - mergp_x, nxl /= 0 ), MERGE( nxr, nxr + mergp_x, nxr /= nx )
	1999	DO k = nzb - mergp_z, nzt + 1 + mergp_z
[4438]	2000	rand_sigma_inv = rand_sigma_inv + rand_it(k,i)**2
[2938]	2001	ENDDO
[4438]	2002	ENDDO
[2938]	2003
[4309]	2004	#if defined( __parallel )
[4438]	2005	!
	2006	!-- Sum-up the local quadratic averages of the random numbers
[4559]	2007	CALL MPI_ALLREDUCE( MPI_IN_PLACE, rand_sigma_inv, 1, MPI_REAL, MPI_SUM, comm1dx, ierr )
[4309]	2008	#endif
[2938]	2009	!
[4438]	2010	!-- Compute standard deviation
	2011	IF ( rand_sigma_inv /= 0.0_wp ) THEN
	2012	rand_sigma_inv = 1.0_wp / SQRT( rand_sigma_inv * nxz_inv )
	2013	ELSE
	2014	rand_sigma_inv = 1.0_wp
[4309]	2015	ENDIF
	2016	!
[4438]	2017	!-- Normalize with standard deviation to obtain unit variance
	2018	rand_it = rand_it * rand_sigma_inv
	2019
	2020	CALL cpu_log( log_point_s(31), 'STG f_n factors', 'start' )
[4309]	2021	!
[4559]	2022	!-- Generate velocity seed following Eq.6 of Xie and Castro (2008). There are two options. In the
	2023	!-- first one, the computation of the seeds is distributed to all processes along the communicator
	2024	!-- comm1dx and gathered on the southmost and, if necessary, on the northmost process. For huge
	2025	!-- length scales the computational effort can become quite huge (it scales with the turbulent
	2026	!-- length scales), so that gain by parallelization exceeds the costs by the subsequent communication.
	2027	!-- In the second option, which performs better when the turbulent length scales are parametrized
	2028	!-- and thus the loops are smaller, the seeds are computed locally and no communication is necessary.
[4438]	2029	IF ( compute_velocity_seeds_local ) THEN
[2938]	2030
[4438]	2031	f_n = 0.0_wp
	2032	DO i = nxl, nxr
	2033	DO k = nzb, nzt+1
	2034	DO ii = -n_x(k), n_x(k)
	2035	DO kk = -n_z(k), n_z(k)
	2036	f_n(k,i) = f_n(k,i) + b_x(ii,k) * b_z(kk,k) * rand_it(k+kk,i+ii)
	2037	ENDDO
[2938]	2038	ENDDO
	2039	ENDDO
	2040	ENDDO
	2041
[4438]	2042	ELSE
[2938]	2043
[4438]	2044	f_n_l = 0.0_wp
	2045	DO i = nxl, nxr
	2046	DO k = nzb_y_stg, nzt_y_stg+1
	2047	DO ii = -n_x(k), n_x(k)
	2048	DO kk = -n_z(k), n_z(k)
	2049	f_n_l(k,i) = f_n_l(k,i) + b_x(ii,k) * b_z(kk,k) * rand_it(k+kk,i+ii)
	2050	ENDDO
	2051	ENDDO
	2052	ENDDO
	2053	ENDDO
[2938]	2054	!
[4438]	2055	!-- Gather velocity seeds of full subdomain
	2056	send_count = nzt_y_stg - nzb_y_stg + 1
	2057	IF ( nzt_y_stg == nzt ) send_count = send_count + 1
[2938]	2058
	2059	#if defined( __parallel )
[4309]	2060	!
[4438]	2061	!-- Gather the processed velocity seed on south boundary mpi ranks.
[4559]	2062	CALL MPI_GATHERV( f_n_l(nzb_y_stg,nxl), send_count, stg_type_xz_small, f_n(nzb+1,nxl), &
	2063	recv_count_xz, displs_xz, stg_type_xz, id_south, comm1dy, ierr )
[4309]	2064	!
[4438]	2065	!-- Gather the processed velocity seed on north boundary mpi ranks.
[4559]	2066	CALL MPI_GATHERV( f_n_l(nzb_y_stg,nxl), send_count, stg_type_xz_small, f_n(nzb+1,nxl), &
	2067	recv_count_xz, displs_xz, stg_type_xz, id_north, comm1dy, ierr )
[2938]	2068	#else
[4438]	2069	f_n(nzb+1:nzt+1,nxl:nxr) = f_n_l(nzb_y_stg:nzt_y_stg+1,nxl:nxr)
[4444]	2070	!
	2071	!-- Next line required to avoid compile errors because of unused dummy arguments
	2072	IF ( id_north == 0 ) id_south = 0
[2938]	2073	#endif
	2074
[4438]	2075	ENDIF
	2076
	2077	DEALLOCATE( rand_it )
	2078
	2079	CALL cpu_log( log_point_s(31), 'STG f_n factors', 'stop' )
	2080
[2938]	2081	END SUBROUTINE stg_generate_seed_xz
	2082
[4559]	2083	!--------------------------------------------------------------------------------------------------!
[3347]	2084	! Description:
	2085	! ------------
[4842]	2086	!> Parametrization of the Reynolds-stress componentes, turbulent length- and time scales. The
[4566]	2087	!> parametrization follows Brost et al. (1982) with modifications described in Rotach et al. (1996),
	2088	!> which is applied in state-of-the-art dispserion modelling.
[4559]	2089	!--------------------------------------------------------------------------------------------------!
[4566]	2090	SUBROUTINE parametrize_turbulence
[3347]	2091
[4566]	2092	INTEGER(iwp) :: k !< loop index in z-direction
[4559]	2093
[4566]	2094	REAL(wp) :: corr_term_uh !< correction term in parametrization of horizontal variances for unstable stratification
	2095	REAL(wp) :: d_zi !< inverse boundary-layer depth
	2096	REAL(wp) :: length_scale_lon !< length scale in flow direction
	2097	REAL(wp) :: length_scale_lon_zi !< length scale in flow direction at boundary-layer top
	2098	REAL(wp) :: length_scale_lat !< length scale in crosswind direction
	2099	REAL(wp) :: length_scale_lat_zi !< length scale in crosswind direction at boundary-layer top
	2100	REAL(wp) :: length_scale_vert !< length scale in vertical direction
	2101	REAL(wp) :: length_scale_vert_zi !< length scale in vertical direction at boundary-layer top
	2102	REAL(wp) :: time_scale_zi !< time scale at boundary-layer top
	2103	REAL(wp) :: r11_zi !< longitudinal variance at boundary-layer top
	2104	REAL(wp) :: r22_zi !< crosswind variance at boundary-layer top
	2105	REAL(wp) :: r33_zi !< vertical variance at boundary-layer top
	2106	REAL(wp) :: r31_zi !< r31 at boundary-layer top
	2107	REAL(wp) :: r32_zi !< r32 at boundary-layer top
	2108	REAL(wp) :: rlat1 !< first dummy argument for crosswind compoment of reynolds stress
	2109	REAL(wp) :: rlat2 !< second dummy argument for crosswind compoment of reynolds stress
	2110	REAL(wp) :: rlon1 !< first dummy argument for longitudinal compoment of reynolds stress
	2111	REAL(wp) :: rlon2 !< second dummy argument for longitudinal compoment of reynolds stress
	2112	REAL(wp) :: zzi !< ratio of z/zi
[4559]	2113
[4566]	2114	REAL(wp), DIMENSION(nzb+1:nzt+1) :: cos_phi !< cosine of angle between mean flow direction and x-axis
	2115	REAL(wp), DIMENSION(nzb+1:nzt+1) :: phi !< angle between mean flow direction and x-axis
	2116	REAL(wp), DIMENSION(nzb+1:nzt+1) :: sin_phi !< sine of angle between mean flow direction and x-axis
	2117
[3347]	2118	!
[4566]	2119	!-- Calculate the boundary-layer top index. Boundary-layer top is calculated by Richardson-bulk
	2120	!-- criterion according to Heinze et al. (2017).
	2121	k_zi = MAX( 1, MINLOC( ABS( zu - zi_ribulk ), DIM = 1 ) )
	2122	IF ( zu(k_zi) > zi_ribulk ) k_zi = k_zi - 1
	2123	k_zi = MIN( k_zi, nzt )
[3347]	2124	!
[4566]	2125	!-- Calculate angle between flow direction and x-axis.
	2126	DO k = nzb+1, nzt + 1
	2127	IF ( u_init(k) /= 0.0_wp ) THEN
	2128	phi(k) = ATAN( v_init(k) / u_init(k) )
	2129	ELSE
	2130	phi(k) = 0.5 * pi
	2131	ENDIF
	2132	!
	2133	!-- Pre-calculate sine and cosine.
	2134	cos_phi(k) = COS( phi(k) )
	2135	sin_phi(k) = SIN( phi(k) )
	2136	ENDDO
	2137	!
	2138	!-- Parametrize Reynolds-stress components. Please note, parametrization is formulated for the
	2139	!-- stream- and spanwise components, while stream- and spanwise direction do not necessarily
	2140	!-- coincide with the grid axis. Hence, components are rotated after computation.
	2141	d_zi = 1.0_wp / zi_ribulk
	2142	DO k = nzb+1, k_zi
	2143
	2144	corr_term_uh = MERGE( 0.35_wp * ABS( &
	2145	- zi_ribulk / ( kappa * scale_l - 10E-4_wp ) &
	2146	)**( 2.0_wp / 3.0_wp ), &
	2147	0.0_wp, &
[4640]	2148	scale_l < -5.0_wp )
[4566]	2149	!
[4022]	2150	!-- Determine normalized height coordinate
[4566]	2151	zzi = zu(k) * d_zi
[3347]	2152	!
[4566]	2153	!-- Compute longitudinal and crosswind component of reynolds stress. Rotate these components by
	2154	!-- the wind direction to map onto the u- and v-component. Note, since reynolds stress for
	2155	!-- variances cannot become negative, take the absolute values.
	2156	rlon1 = scale_us*2 ( corr_term_uh + 5.0_wp - 4.0_wp * zzi )
	2157	rlat1 = scale_us*2 ( corr_term_uh + 2.0_wp - zzi )
[4559]	2158
[4566]	2159	r11(k) = ABS( cos_phi(k) * rlon1 + sin_phi(k) * rlat1 )
	2160	r22(k) = ABS( - sin_phi(k) * rlon1 + cos_phi(k) * rlat1 )
[4559]	2161	!
	2162	!-- w'w'
[4566]	2163	r33(k) = scale_wm*2 ( &
	2164	1.5_wp * zzi*( 2.0_wp / 3.0_wp ) EXP( -2.0_wp * zzi ) &
	2165	+ ( 1.7_wp - zzi ) * ( scale_us / scale_wm )**2 &
	2166	)
[4559]	2167	!
[4566]	2168	!-- u'w' and v'w'. After calculation of the longitudinal and crosswind component
[4842]	2169	!-- these are projected along the x- and y-direction. Note, it is assumed that
[4566]	2170	!-- the flux within the boundary points opposite to the vertical gradient.
	2171	rlon2 = scale_us*2 ( zzi - 1.0_wp )
	2172	rlat2 = scale_us*2 ( 0.4 * zzi * ( 1.0_wp - zzi ) )
	2173
	2174	r31(k) = SIGN( ABS( cos_phi(k) * rlon2 + sin_phi(k) * rlat2 ), &
	2175	- ( u_init(k+1) - u_init(k-1) ) )
	2176	r32(k) = SIGN( ABS( - sin_phi(k) * rlon2 + cos_phi(k) * rlat2 ), &
	2177	- ( v_init(k+1) - v_init(k-1) ) )
[3347]	2178	!
[4640]	2179	!-- For u'v' no parametrization exist so far. For simplicity assume a similar profile as
	2180	!-- for the vertical transport.
	2181	r21(k) = 0.5_wp * ( r31(k) + r32(k) )
	2182	!
[4566]	2183	!-- Compute turbulent time scales according to Brost et al. (1982). Note, time scales are
	2184	!-- limited to the adjustment time scales.
	2185	tu(k) = MIN( dt_stg_adjust, &
	2186	3.33_wp * zzi * ( 1.0 - 0.67_wp * zzi ) / scale_wm * zi_ribulk )
	2187
	2188	tv(k) = tu(k)
	2189	tw(k) = tu(k)
	2190
	2191	length_scale_lon = MIN( SQRT( r11(k) ) * tu(k), zi_ribulk )
	2192	length_scale_lat = MIN( SQRT( r22(k) ) * tv(k), zi_ribulk )
	2193	length_scale_vert = MIN( SQRT( r33(k) ) * tw(k), zi_ribulk )
	2194	!
	2195	!-- Assume isotropic turbulence length scales
	2196	nux(k) = MAX( INT( length_scale_lon * ddx ), 1 )
	2197	nuy(k) = MAX( INT( length_scale_lat * ddy ), 1 )
	2198	nvx(k) = MAX( INT( length_scale_lon * ddx ), 1 )
	2199	nvy(k) = MAX( INT( length_scale_lat * ddy ), 1 )
	2200	nwx(k) = MAX( INT( length_scale_lon * ddx ), 1 )
	2201	nwy(k) = MAX( INT( length_scale_lat * ddy ), 1 )
	2202	nuz(k) = MAX( INT( length_scale_vert * ddzw(k) ), 1 )
	2203	nvz(k) = MAX( INT( length_scale_vert * ddzw(k) ), 1 )
	2204	nwz(k) = MAX( INT( length_scale_vert * ddzw(k) ), 1 )
	2205
[3347]	2206	ENDDO
[4566]	2207	!
	2208	!-- Above boundary-layer top length- and timescales as well as reynolds-stress components are
	2209	!-- reduced to zero by a blending function.
	2210	length_scale_lon_zi = SQRT( r11(k_zi) ) * tu(k_zi)
	2211	length_scale_lat_zi = SQRT( r22(k_zi) ) * tv(k_zi)
	2212	length_scale_vert_zi = SQRT( r33(k_zi) ) * tu(k_zi)
[3347]	2213
[4566]	2214	time_scale_zi = tu(k_zi)
	2215	r11_zi = r11(k_zi)
	2216	r22_zi = r22(k_zi)
	2217	r33_zi = r33(k_zi)
	2218	r31_zi = r31(k_zi)
	2219	r32_zi = r32(k_zi)
	2220
	2221	d_l = blend_coeff / MAX( length_scale_vert_zi, dx, dy, MINVAL( dzw ) )
	2222
	2223	DO k = k_zi+1, nzt+1
[3347]	2224	!
[4566]	2225	!-- Calculate function to gradually decrease Reynolds stress above ABL top.
	2226	blend = MIN( 1.0_wp, EXP( d_l * zu(k) - d_l * zi_ribulk ) )
	2227	!
	2228	!-- u'u' and v'v'. Assume isotropy. Note, add a small negative number to the denominator, else
	2229	!-- the mergpe-function can crash if scale_l is zero.
	2230	r11(k) = r11_zi * blend
	2231	r22(k) = r22_zi * blend
	2232	r33(k) = r33_zi * blend
	2233	r31(k) = r31_zi * blend
	2234	r32(k) = r32_zi * blend
[4640]	2235	r21(k) = 0.5_wp * ( r31(k) + r32(k) )
[4566]	2236
	2237	!
	2238	!-- Compute turbulent time scales according to Brost et al. (1982).
	2239	!-- Note, time scales are limited to the adjustment time scales.
	2240	tu(k) = time_scale_zi * blend
	2241	tv(k) = time_scale_zi * blend
	2242	tw(k) = time_scale_zi * blend
	2243
	2244	length_scale_lon = length_scale_lon_zi * blend
	2245	length_scale_lat = length_scale_lat_zi * blend
	2246	length_scale_vert = length_scale_vert_zi * blend
	2247	!
	2248	!-- Assume isotropic turbulence length scales
	2249	nux(k) = MAX( INT( length_scale_lon * ddx ), 1 )
	2250	nuy(k) = MAX( INT( length_scale_lat * ddy ), 1 )
	2251	nvx(k) = MAX( INT( length_scale_lon * ddx ), 1 )
	2252	nvy(k) = MAX( INT( length_scale_lat * ddy ), 1 )
	2253	nwx(k) = MAX( INT( length_scale_lon * ddx ), 1 )
	2254	nwy(k) = MAX( INT( length_scale_lat * ddy ), 1 )
	2255	nuz(k) = MAX( INT( length_scale_vert * ddzw(k) ), 1 )
	2256	nvz(k) = MAX( INT( length_scale_vert * ddzw(k) ), 1 )
	2257	nwz(k) = MAX( INT( length_scale_vert * ddzw(k) ), 1 )
	2258	ENDDO
	2259	!
	2260	!-- Set bottom boundary condition for reynolds stresses
[3347]	2261	r11(nzb) = r11(nzb+1)
	2262	r22(nzb) = r22(nzb+1)
	2263	r33(nzb) = r33(nzb+1)
	2264
	2265	r21(nzb) = r11(nzb+1)
	2266	r31(nzb) = r31(nzb+1)
	2267	r32(nzb) = r32(nzb+1)
	2268
[4566]	2269	!
	2270	!-- Set bottom boundary condition for the length and time scales
	2271	nux(nzb) = nux(nzb+1)
	2272	nuy(nzb) = nuy(nzb+1)
	2273	nuz(nzb) = nuz(nzb+1)
	2274	nvx(nzb) = nvx(nzb+1)
	2275	nvy(nzb) = nvy(nzb+1)
	2276	nvz(nzb) = nvz(nzb+1)
	2277	nwx(nzb) = nwx(nzb+1)
	2278	nwy(nzb) = nwy(nzb+1)
	2279	nwz(nzb) = nwz(nzb+1)
[4559]	2280
[4566]	2281	tu(nzb) = tu(nzb+1)
	2282	tv(nzb) = tv(nzb+1)
	2283	tw(nzb) = tw(nzb+1)
[4559]	2284
[4566]	2285	adjustment_step = .TRUE.
	2286
	2287	END SUBROUTINE parametrize_turbulence
	2288
[4559]	2289	!--------------------------------------------------------------------------------------------------!
[3347]	2290	! Description:
	2291	! ------------
[4559]	2292	!> Calculate the coefficient matrix from the Lund rotation.
	2293	!--------------------------------------------------------------------------------------------------!
[3347]	2294	SUBROUTINE calc_coeff_matrix
	2295
[4559]	2296	INTEGER(iwp) :: k !< loop index in z-direction
	2297
[3347]	2298	!
	2299	!-- Calculate coefficient matrix. Split loops to allow for loop vectorization.
	2300	DO k = nzb+1, nzt+1
[4022]	2301	IF ( r11(k) > 10E-6_wp ) THEN
[4842]	2302	a11(k) = SQRT( r11(k) )
[3347]	2303	a21(k) = r21(k) / a11(k)
	2304	a31(k) = r31(k) / a11(k)
	2305	ELSE
	2306	a11(k) = 10E-8_wp
	2307	a21(k) = 10E-8_wp
	2308	a31(k) = 10E-8_wp
	2309	ENDIF
	2310	ENDDO
	2311	DO k = nzb+1, nzt+1
[4842]	2312	a22(k) = r22(k) - a21(k)**2
[4022]	2313	IF ( a22(k) > 10E-6_wp ) THEN
[3347]	2314	a22(k) = SQRT( a22(k) )
[4566]	2315	a32(k) = ( r32(k) - a21(k) * a31(k) ) / a22(k)
[4842]	2316	ELSE
[3347]	2317	a22(k) = 10E-8_wp
	2318	a32(k) = 10E-8_wp
	2319	ENDIF
	2320	ENDDO
	2321	DO k = nzb+1, nzt+1
	2322	a33(k) = r33(k) - a31(k)2 - a32(k)2
[4022]	2323	IF ( a33(k) > 10E-6_wp ) THEN
[3347]	2324	a33(k) = SQRT( a33(k) )
	2325	ELSE
	2326	a33(k) = 10E-8_wp
	2327	ENDIF
[4559]	2328	ENDDO
[3347]	2329	!
	2330	!-- Set bottom boundary condition
	2331	a11(nzb) = a11(nzb+1)
	2332	a22(nzb) = a22(nzb+1)
	2333	a21(nzb) = a21(nzb+1)
[4559]	2334	a33(nzb) = a33(nzb+1)
[3347]	2335	a31(nzb) = a31(nzb+1)
[4559]	2336	a32(nzb) = a32(nzb+1)
[3347]	2337
	2338	END SUBROUTINE calc_coeff_matrix
[4559]	2339
	2340	!--------------------------------------------------------------------------------------------------!
[3347]	2341	! Description:
	2342	! ------------
[4559]	2343	!> This routine controls the re-adjustment of the turbulence statistics used for generating
	2344	!> turbulence at the lateral boundaries.
	2345	!--------------------------------------------------------------------------------------------------!
[3347]	2346	SUBROUTINE stg_adjust
	2347
[3987]	2348	IF ( debug_output_timestep ) CALL debug_message( 'stg_adjust', 'start' )
[3347]	2349	!
[4559]	2350	!-- In case of dirichlet inflow boundary conditions only at one lateral boundary, i.e. in the case
	2351	!-- no offline or self nesting is applied but synthetic turbulence shall be parametrized
	2352	!-- nevertheless, the boundary-layer depth need to determined first.
	2353	IF ( .NOT. nesting_offline .AND. .NOT. child_domain ) &
	2354	CALL nesting_offl_calc_zi
[4022]	2355	!
[4559]	2356	!-- Compute scaling parameters (domain-averaged), such as friction velocity are calculated.
[3347]	2357	CALL calc_scaling_variables
	2358	!
[4842]	2359	!-- Parametrize Reynolds-stress tensor. Parametrization follows Brost et al. (1982) with
[4566]	2360	!-- modifications described in Rotach et al. (1996) and is based on boundary-layer depth, friction
[4842]	2361	!-- velocity and velocity scale.
[4566]	2362	CALL parametrize_turbulence
[3347]	2363	!
[4842]	2364	!-- Calculate coefficient matrix from Reynolds stress tensor
[4566]	2365	!-- (Lund rotation)
[3347]	2366	CALL calc_coeff_matrix
	2367	!
[4566]	2368	!-- Setup filter functions according to updated length scales.
	2369	CALL stg_setup_filter_function
[3347]	2370	!
	2371	!-- Reset time counter for controlling next adjustment to zero
	2372	time_stg_adjust = 0.0_wp
[3987]	2373
	2374	IF ( debug_output_timestep ) CALL debug_message( 'stg_adjust', 'end' )
[4559]	2375
	2376	END SUBROUTINE stg_adjust
	2377
	2378
	2379	!--------------------------------------------------------------------------------------------------!
[3347]	2380	! Description:
	2381	! ------------
[4559]	2382	!> Calculate scaling variables which are used for turbulence parametrization according to Rotach
	2383	!> et al. (1996). Scaling variables are: friction velocity, boundary-layer depth, momentum velocity
	2384	!> scale, and Obukhov length.
	2385	!--------------------------------------------------------------------------------------------------!
[3347]	2386	SUBROUTINE calc_scaling_variables
	2387
[4559]	2388	INTEGER(iwp) :: i !< loop index in x-direction
	2389	INTEGER(iwp) :: j !< loop index in y-direction
	2390	INTEGER(iwp) :: k !< loop index in z-direction
	2391	INTEGER(iwp) :: m !< surface element index
[3347]	2392
[4559]	2393	REAL(wp) :: friction_vel_l !< mean friction veloctiy on subdomain
	2394	REAL(wp) :: pt_surf_mean !< mean near surface temperature (at 1st grid point)
	2395	REAL(wp) :: pt_surf_mean_l !< mean near surface temperature (at 1st grid point) on subdomain
	2396	REAL(wp) :: scale_l_l !< mean Obukhov lenght on subdomain
	2397	REAL(wp) :: shf_mean !< mean surface sensible heat flux
	2398	REAL(wp) :: shf_mean_l !< mean surface sensible heat flux on subdomain
	2399	REAL(wp) :: w_convective !< convective velocity scale
	2400
[3347]	2401	!
[4559]	2402	!-- Calculate mean friction velocity, velocity scale, heat flux and near-surface temperature in the
	2403	!-- model domain.
[3937]	2404	pt_surf_mean_l = 0.0_wp
	2405	shf_mean_l = 0.0_wp
	2406	scale_l_l = 0.0_wp
	2407	friction_vel_l = 0.0_wp
[3347]	2408	DO m = 1, surf_def_h(0)%ns
[3937]	2409	i = surf_def_h(0)%i(m)
	2410	j = surf_def_h(0)%j(m)
	2411	k = surf_def_h(0)%k(m)
	2412	friction_vel_l = friction_vel_l + surf_def_h(0)%us(m)
	2413	shf_mean_l = shf_mean_l + surf_def_h(0)%shf(m) * drho_air(k)
	2414	scale_l_l = scale_l_l + surf_def_h(0)%ol(m)
	2415	pt_surf_mean_l = pt_surf_mean_l + pt(k,j,i)
[4559]	2416	ENDDO
[4671]	2417	DO m = 1, surf_lsm_h(0)%ns
	2418	i = surf_lsm_h(0)%i(m)
	2419	j = surf_lsm_h(0)%j(m)
	2420	k = surf_lsm_h(0)%k(m)
	2421	friction_vel_l = friction_vel_l + surf_lsm_h(0)%us(m)
	2422	shf_mean_l = shf_mean_l + surf_lsm_h(0)%shf(m) * drho_air(k)
	2423	scale_l_l = scale_l_l + surf_lsm_h(0)%ol(m)
[3937]	2424	pt_surf_mean_l = pt_surf_mean_l + pt(k,j,i)
[3347]	2425	ENDDO
[4671]	2426	DO m = 1, surf_usm_h(0)%ns
	2427	i = surf_usm_h(0)%i(m)
	2428	j = surf_usm_h(0)%j(m)
	2429	k = surf_usm_h(0)%k(m)
	2430	friction_vel_l = friction_vel_l + surf_usm_h(0)%us(m)
	2431	shf_mean_l = shf_mean_l + surf_usm_h(0)%shf(m) * drho_air(k)
	2432	scale_l_l = scale_l_l + surf_usm_h(0)%ol(m)
[3937]	2433	pt_surf_mean_l = pt_surf_mean_l + pt(k,j,i)
[3347]	2434	ENDDO
[4559]	2435
[3347]	2436	#if defined( __parallel )
[4559]	2437	CALL MPI_ALLREDUCE( friction_vel_l, scale_us, 1, MPI_REAL, MPI_SUM, comm2d, ierr )
	2438	CALL MPI_ALLREDUCE( shf_mean_l, shf_mean, 1, MPI_REAL, MPI_SUM, comm2d, ierr )
	2439	CALL MPI_ALLREDUCE( scale_l_l, scale_l, 1, MPI_REAL, MPI_SUM, comm2d, ierr )
	2440	CALL MPI_ALLREDUCE( pt_surf_mean_l, pt_surf_mean, 1, MPI_REAL, MPI_SUM, comm2d, ierr )
[3347]	2441	#else
[3937]	2442	scale_us = friction_vel_l
	2443	shf_mean = shf_mean_l
	2444	scale_l = scale_l_l
	2445	pt_surf_mean = pt_surf_mean_l
[3347]	2446	#endif
	2447
[4566]	2448	scale_us = scale_us * d_nxy
	2449	shf_mean = shf_mean * d_nxy
	2450	scale_l = scale_l * d_nxy
	2451	pt_surf_mean = pt_surf_mean * d_nxy
[3347]	2452	!
[4559]	2453	!-- Compute mean convective velocity scale. Note, in case the mean heat flux is negative, set
	2454	!-- convective velocity scale to zero.
[3347]	2455	IF ( shf_mean > 0.0_wp ) THEN
[3937]	2456	w_convective = ( g * shf_mean * zi_ribulk / pt_surf_mean )**( 1.0_wp / 3.0_wp )
[3347]	2457	ELSE
	2458	w_convective = 0.0_wp
	2459	ENDIF
	2460	!
[4566]	2461	!-- At the initial run the friction velocity is initialized close to zero, leading to almost zero
	2462	!-- disturbances at the boundaries. In order to obtain disturbances nevertheless, set a minium
	2463	!-- value of friction velocity for the reynolds-stress parametrization.
	2464	IF ( time_since_reference_point <= 0.0_wp ) scale_us = MAX( scale_us, 0.05_wp )
	2465	!
[4559]	2466	!-- Finally, in order to consider also neutral or stable stratification, compute momentum velocity
	2467	!-- scale from u* and convective velocity scale, according to Rotach et al. (1996).
[3347]	2468	scale_wm = ( scale_us*3 + 0.6_wp w_convective3 )( 1.0_wp / 3.0_wp )
[4559]	2469
[3347]	2470	END SUBROUTINE calc_scaling_variables
	2471
[2259]	2472	END MODULE synthetic_turbulence_generator_mod

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source: palm/trunk/SOURCE/synthetic_turbulence_generator_mod.f90 @ 4879

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