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source: palm/trunk/SOURCE/synthetic_turbulence_generator_mod.f90 @ 2874

Last change on this file since 2874 was 2841, checked in by knoop, 7 years ago
Bugfix: wrong placement of include 'mpif.h' corrected
Property svn:keywords set to `Id`
File size: 36.0 KB

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1	!> @synthetic_turbulence_generator_mod.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: synthetic_turbulence_generator_mod.f90 2841 2018-02-27 15:02:57Z knoop $
27	! Bugfix: wrong placement of include 'mpif.h' corrected
28	!
29	! 2836 2018-02-26 13:40:05Z Giersch
30	! The variables synthetic_turbulence_generator and
31	! use_synthetic_turbulence_generator have been abbreviated + syn_turb_gen_prerun
32	! flag is used to define if module related parameters were outputted as restart
33	! data
34	!
35	! 2716 2017-12-29 16:35:59Z kanani
36	! Corrected "Former revisions" section
37	!
38	! 2696 2017-12-14 17:12:51Z kanani
39	! Change in file header (GPL part)
40	!
41	! 2669 2017-12-06 16:03:27Z raasch
42	! unit number for file containing turbulence generator data changed to 90
43	! bugfix: preprocessor directives added for MPI specific code
44	!
45	! 2576 2017-10-24 13:49:46Z Giersch
46	! Definition of a new function called stg_skip_var_list to skip module
47	! parameters during reading restart data
48	!
49	! 2563 2017-10-19 15:36:10Z Giersch
50	! stg_read_restart_data is called in stg_parin in the case of a restart run
51	!
52	! 2259 2017-06-08 09:09:11Z gronemeier
53	! Initial revision
54	!
55	!
56	!
57	! Authors:
58	! --------
59	! @author Tobias Gronemeier, Atsushi Inagaki, Micha Gryschka, Christoph Knigge
60	!
61	!
62	! Description:
63	! ------------
64	!> The module generates turbulence at the inflow boundary based on a method by
65	!> Xie and Castro (2008) utilizing a Lund rotation (Lund, 1998) and a mass-flux
66	!> correction by Kim et al. (2013).
67	!> The turbulence is correlated based on length scales in y- and z-direction and
68	!> a time scale for each velocity component. The profiles of length and time
69	!> scales, mean u, v, w, e and pt, and all components of the Reynolds stress
70	!> tensor are read from file STG_PROFILES.
71	!>
72	!> @todo test restart
73	!> enable cyclic_fill
74	!> implement turbulence generation for e and pt
75	!> @note <Enter notes on the module>
76	!> @bug Height information from input file is not used. Profiles from input
77	!> must match with current PALM grid.
78	!> Transformation of length scales to number of gridpoints does not
79	!> consider grid stretching.
80	!> In case of restart, velocity seeds differ from precursor run if a11,
81	!> a22, or a33 are zero.
82	!------------------------------------------------------------------------------!
83	MODULE synthetic_turbulence_generator_mod
84
85
86	USE arrays_3d, &
87	ONLY: mean_inflow_profiles, u, v, w
88
89	USE constants, &
90	ONLY: pi
91
92	USE control_parameters, &
93	ONLY: initializing_actions, message_string, &
94	syn_turb_gen, syn_turb_gen_prerun
95
96	USE cpulog, &
97	ONLY: cpu_log, log_point, log_point_s
98
99	USE indices, &
100	ONLY: nbgp, nzb, nzt, nyng, nysg
101
102	USE kinds
103
104	#if !defined( __mpifh )
105	USE MPI
106	#endif
107
108	USE pegrid, &
109	ONLY: comm1dx, comm1dy, comm2d, id_inflow, ierr, myidx, pdims
110
111	USE transpose_indices, &
112	ONLY: nzb_x, nzt_x
113
114
115	IMPLICIT NONE
116
117	#if defined( __mpifh )
118	INCLUDE "mpif.h"
119	#endif
120
121	LOGICAL :: velocity_seed_initialized = .FALSE. !< true after first call of stg_main
122	LOGICAL :: use_syn_turb_gen = .FALSE. !< switch to use synthetic turbulence generator
123
124	INTEGER(iwp) :: stg_type_yz !< MPI type for full z range
125	INTEGER(iwp) :: stg_type_yz_small !< MPI type for small z range
126	INTEGER(iwp) :: merg !< maximum length scale (in gp)
127	INTEGER(iwp) :: mergp !< merg + nbgp
128
129	REAL(wp) :: mc_factor !< mass flux correction factor
130
131	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: displs !< displacement for MPI_GATHERV
132	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: recv_count !< receive count for MPI_GATHERV
133	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuy !< length scale of u in y direction (in gp)
134	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuz !< length scale of u in z direction (in gp)
135	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvy !< length scale of v in y direction (in gp)
136	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvz !< length scale of v in z direction (in gp)
137	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwy !< length scale of w in y direction (in gp)
138	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwz !< length scale of w in z direction (in gp)
139
140	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: seed !< seed of random number for rn-generator
141
142	REAL(wp), DIMENSION(:), ALLOCATABLE :: a11 !< coefficient for Lund rotation
143	REAL(wp), DIMENSION(:), ALLOCATABLE :: a21 !< coefficient for Lund rotation
144	REAL(wp), DIMENSION(:), ALLOCATABLE :: a22 !< coefficient for Lund rotation
145	REAL(wp), DIMENSION(:), ALLOCATABLE :: a31 !< coefficient for Lund rotation
146	REAL(wp), DIMENSION(:), ALLOCATABLE :: a32 !< coefficient for Lund rotation
147	REAL(wp), DIMENSION(:), ALLOCATABLE :: a33 !< coefficient for Lund rotation
148	REAL(wp), DIMENSION(:), ALLOCATABLE :: tu !< Lagrangian time scale of u
149	REAL(wp), DIMENSION(:), ALLOCATABLE :: tv !< Lagrangian time scale of v
150	REAL(wp), DIMENSION(:), ALLOCATABLE :: tw !< Lagrangian time scale of w
151
152	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buy !< filter function for u in y direction
153	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buz !< filter function for u in z direction
154	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvy !< filter function for v in y direction
155	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvz !< filter function for v in z direction
156	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwy !< filter function for w in y direction
157	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwz !< filter function for w in z direction
158	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fu !< velocity seed for u
159	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fuo !< velocity seed for u with new random number
160	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fv !< velocity seed for v
161	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fvo !< velocity seed for v with new random number
162	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fw !< velocity seed for w
163	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fwo !< velocity seed for w with new random number
164
165
166	!
167	!-- PALM interfaces:
168	!-- Input parameter checks to be done in check_parameters
169	INTERFACE stg_check_parameters
170	MODULE PROCEDURE stg_check_parameters
171	END INTERFACE stg_check_parameters
172
173	!
174	!-- Calculate filter functions
175	INTERFACE stg_filter_func
176	MODULE PROCEDURE stg_filter_func
177	END INTERFACE stg_filter_func
178
179	!
180	!-- Generate velocity seeds
181	INTERFACE stg_generate_seed_yz
182	MODULE PROCEDURE stg_generate_seed_yz
183	END INTERFACE stg_generate_seed_yz
184
185	!
186	!-- Output of information to the header file
187	INTERFACE stg_header
188	MODULE PROCEDURE stg_header
189	END INTERFACE stg_header
190
191	!
192	!-- Initialization actions
193	INTERFACE stg_init
194	MODULE PROCEDURE stg_init
195	END INTERFACE stg_init
196
197	!
198	!-- Main procedure of synth. turb. gen.
199	INTERFACE stg_main
200	MODULE PROCEDURE stg_main
201	END INTERFACE stg_main
202
203	!
204	!-- Reading of NAMELIST parameters
205	INTERFACE stg_parin
206	MODULE PROCEDURE stg_parin
207	END INTERFACE stg_parin
208
209	!
210	!-- Skipping of parameters for restart runs
211	INTERFACE stg_skip_var_list
212	MODULE PROCEDURE stg_skip_var_list
213	END INTERFACE stg_skip_var_list
214
215	!
216	!-- Reading of parameters for restart runs
217	INTERFACE stg_read_restart_data
218	MODULE PROCEDURE stg_read_restart_data
219	END INTERFACE stg_read_restart_data
220
221	!
222	!-- Writing of binary output for restart runs
223	INTERFACE stg_write_restart_data
224	MODULE PROCEDURE stg_write_restart_data
225	END INTERFACE stg_write_restart_data
226
227	SAVE
228
229	PRIVATE
230
231	!
232	!-- Public interfaces
233	PUBLIC stg_check_parameters, stg_header, stg_init, stg_main, stg_parin, &
234	stg_write_restart_data, stg_skip_var_list
235
236	!
237	!-- Public variables
238	PUBLIC use_syn_turb_gen
239
240
241	CONTAINS
242
243
244	!------------------------------------------------------------------------------!
245	! Description:
246	! ------------
247	!> Check parameters routine for synthetic turbulence generator
248	!------------------------------------------------------------------------------!
249	SUBROUTINE stg_check_parameters
250
251
252	USE control_parameters, &
253	ONLY: bc_lr, bc_ns, turbulent_inflow
254
255
256	IMPLICIT NONE
257
258	IF ( use_syn_turb_gen ) THEN
259
260	IF ( INDEX( initializing_actions, 'set_constant_profiles' ) == 0 .AND. &
261	INDEX( initializing_actions, 'read_restart_data' ) == 0 ) THEN
262	message_string = 'Using synthetic turbulence generator ' // &
263	'requires &initializing_actions = ' // &
264	'"set_constant_profiles" or "read_restart_data"'
265	CALL message( 'stg_check_parameters', 'PA0015', 1, 2, 0, 6, 0 )
266	ENDIF
267
268	IF ( bc_lr /= 'dirichlet/radiation' ) THEN
269	message_string = 'Using synthetic turbulence generator ' // &
270	'requires &bc_lr = "dirichlet/radiation"'
271	CALL message( 'stg_check_parameters', 'PA0035', 1, 2, 0, 6, 0 )
272	ENDIF
273	IF ( bc_ns /= 'cyclic' ) THEN
274	message_string = 'Using synthetic turbulence generator ' // &
275	'requires &bc_ns = "cyclic"'
276	CALL message( 'stg_check_parameters', 'PA0037', 1, 2, 0, 6, 0 )
277	ENDIF
278	IF ( turbulent_inflow ) THEN
279	message_string = 'Using synthetic turbulence generator ' // &
280	'in combination &with turbulent_inflow = .T. ' // &
281	'is not allowed'
282	CALL message( 'stg_check_parameters', 'PA0039', 1, 2, 0, 6, 0 )
283	ENDIF
284
285	ENDIF
286
287	END SUBROUTINE stg_check_parameters
288
289
290	!------------------------------------------------------------------------------!
291	! Description:
292	! ------------
293	!> Header output for synthetic turbulence generator
294	!------------------------------------------------------------------------------!
295	SUBROUTINE stg_header ( io )
296
297
298	IMPLICIT NONE
299
300	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
301
302	!
303	!-- Write synthetic turbulence generator Header
304	WRITE( io, 1 )
305	IF ( use_syn_turb_gen ) THEN
306	WRITE( io, 2 )
307	ELSE
308	WRITE( io, 3 )
309	ENDIF
310
311	1 FORMAT (//' Synthetic turbulence generator information:'/ &
312	' ------------------------------------------'/)
313	2 FORMAT (' synthetic turbulence generator switched on')
314	3 FORMAT (' synthetic turbulence generator switched off')
315
316	END SUBROUTINE stg_header
317
318
319	!------------------------------------------------------------------------------!
320	! Description:
321	! ------------
322	!> Initialization of the synthetic turbulence generator
323	!------------------------------------------------------------------------------!
324	SUBROUTINE stg_init
325
326
327	USE arrays_3d, &
328	ONLY: u_init, v_init
329
330	USE control_parameters, &
331	ONLY: coupling_char, dz, e_init
332
333	USE grid_variables, &
334	ONLY: ddy
335
336
337	IMPLICIT NONE
338
339	#if defined( __parallel )
340	INTEGER(KIND=MPI_ADDRESS_KIND) :: extent !< extent of new MPI type
341	INTEGER(KIND=MPI_ADDRESS_KIND) :: tob=0 !< dummy variable
342	#endif
343
344	INTEGER(iwp) :: j !> loop index
345	INTEGER(iwp) :: k !< index
346	INTEGER(iwp) :: newtype !< dummy MPI type
347	INTEGER(iwp) :: realsize !< size of REAL variables
348	INTEGER(iwp) :: nseed !< dimension of random number seed
349	INTEGER(iwp) :: startseed = 1234567890 !< start seed for random number generator
350
351	!
352	!-- Dummy variables used for reading profiles
353	REAL(wp) :: d1 !< u profile
354	REAL(wp) :: d2 !< v profile
355	REAL(wp) :: d3 !< w profile
356	REAL(wp) :: d5 !< e profile
357	REAL(wp) :: d11 !< vertical interpolation for a11
358	REAL(wp) :: d21 !< vertical interpolation for a21
359	REAL(wp) :: d22 !< vertical interpolation for a22
360	REAL(wp) :: luy !< length scale for u in y direction
361	REAL(wp) :: luz !< length scale for u in z direction
362	REAL(wp) :: lvy !< length scale for v in y direction
363	REAL(wp) :: lvz !< length scale for v in z direction
364	REAL(wp) :: lwy !< length scale for w in y direction
365	REAL(wp) :: lwz !< length scale for w in z direction
366	REAL(wp) :: zz !< height
367
368	REAL(wp),DIMENSION(nzb:nzt+1) :: r11 !< Reynolds parameter
369	REAL(wp),DIMENSION(nzb:nzt+1) :: r21 !< Reynolds parameter
370	REAL(wp),DIMENSION(nzb:nzt+1) :: r22 !< Reynolds parameter
371	REAL(wp),DIMENSION(nzb:nzt+1) :: r31 !< Reynolds parameter
372	REAL(wp),DIMENSION(nzb:nzt+1) :: r32 !< Reynolds parameter
373	REAL(wp),DIMENSION(nzb:nzt+1) :: r33 !< Reynolds parameter
374
375
376	#if defined( __parallel )
377	CALL MPI_BARRIER( comm2d, ierr )
378	#endif
379
380	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'start' )
381
382	IF ( .NOT. ALLOCATED( mean_inflow_profiles ) ) &
383	ALLOCATE( mean_inflow_profiles(nzb:nzt+1,5) )
384
385	ALLOCATE ( a11(nzb:nzt+1), a21(nzb:nzt+1), a22(nzb:nzt+1), &
386	a31(nzb:nzt+1), a32(nzb:nzt+1), a33(nzb:nzt+1), &
387	nuy(nzb:nzt+1), nuz(nzb:nzt+1), nvy(nzb:nzt+1), &
388	nvz(nzb:nzt+1), nwy(nzb:nzt+1), nwz(nzb:nzt+1), &
389	tu(nzb:nzt+1), tv(nzb:nzt+1), tw(nzb:nzt+1) )
390
391	#if defined( __parallel )
392	!
393	!-- Define MPI type used in stg_generate_seed_yz to gather vertical splitted
394	!-- velocity seeds
395	CALL MPI_TYPE_SIZE( MPI_REAL, realsize, ierr )
396	extent = 1 * realsize
397
398	! stg_type_yz: yz-slice with vertical bounds nzb:nzt+1
399	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt-nzb+2,nyng-nysg+1], &
400	[1,nyng-nysg+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
401	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz, ierr )
402	CALL MPI_TYPE_COMMIT( stg_type_yz, ierr )
403	CALL MPI_TYPE_FREE( newtype, ierr )
404
405	! stg_type_yz_small: yz-slice with vertical bounds nzb_x:nzt_x+1
406	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt_x-nzb_x+2,nyng-nysg+1], &
407	[1,nyng-nysg+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
408	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz_small, ierr )
409	CALL MPI_TYPE_COMMIT( stg_type_yz_small, ierr )
410	CALL MPI_TYPE_FREE( newtype, ierr )
411
412	! receive count and displacement for MPI_GATHERV in stg_generate_seed_yz
413	ALLOCATE( recv_count(pdims(1)), displs(pdims(1)) )
414
415	recv_count = nzt_x-nzb_x + 1
416	recv_count(pdims(1)) = recv_count(pdims(1)) + 1
417
418	DO j = 1, pdims(1)
419	displs(j) = 0 + (nzt_x-nzb_x+1) * (j-1)
420	ENDDO
421	#endif
422
423	!
424	!-- Define seed of random number
425	CALL RANDOM_SEED()
426	CALL RANDOM_SEED( size=nseed )
427	ALLOCATE( seed(1:nseed) )
428	DO j = 1, nseed
429	seed(j) = startseed + j
430	ENDDO
431	CALL RANDOM_SEED(put=seed)
432
433	!
434	!-- Read inflow profile
435	!-- Height levels of profiles in input profile is as follows:
436	!-- zu: luy, luz, tu, lvy, lvz, tv, r11, r21, r22, d1, d2, d5
437	!-- zw: lwy, lwz, tw, r31, r32, r33, d3
438	!-- WARNING: zz is not used at the moment
439	OPEN( 90, FILE='STG_PROFILES'//TRIM( coupling_char ), STATUS='OLD', &
440	FORM='FORMATTED')
441
442	! Skip header
443	READ( 90, * )
444
445	DO k = nzb, nzt+1
446	READ( 90, * ) zz, luy, luz, tu(k), lvy, lvz, tv(k), lwy, lwz, tw(k), &
447	r11(k), r21(k), r22(k), r31(k), r32(k), r33(k), &
448	d1, d2, d3, d5
449
450	!
451	!-- Convert length scales from meter to number of grid points
452	nuy(k) = INT( luy * ddy )
453	nuz(k) = INT( luz / dz )
454	nvy(k) = INT( lvy * ddy )
455	nvz(k) = INT( lvz / dz )
456	nwy(k) = INT( lwy * ddy )
457	nwz(k) = INT( lwz / dz )
458
459	!
460	!-- Save Mean inflow profiles
461	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
462	mean_inflow_profiles(k,1) = d1
463	mean_inflow_profiles(k,2) = d2
464	! mean_inflow_profiles(k,4) = d4
465	mean_inflow_profiles(k,5) = d5
466	ENDIF
467	ENDDO
468
469	CLOSE( 90 )
470
471	!
472	!-- Assign initial profiles
473	u_init = mean_inflow_profiles(:,1)
474	v_init = mean_inflow_profiles(:,2)
475	! pt_init = mean_inflow_profiles(:,4)
476	e_init = MAXVAL( mean_inflow_profiles(:,5) )
477
478	!
479	!-- Calculate coefficient matrix from Reynolds stress tensor (Lund rotation)
480	DO k = nzb, nzt+1
481	IF ( r11(k) > 0.0_wp ) THEN
482	a11(k) = SQRT( r11(k) )
483	a21(k) = r21(k) / a11(k)
484	ELSE
485	a11(k) = 0.0_wp
486	a21(k) = 0.0_wp
487	ENDIF
488
489	a22(k) = r22(k) - a21(k)**2
490	IF ( a22(k) > 0.0_wp ) THEN
491	a22(k) = SQRT( a22(k) )
492	a32(k) = ( r32(k) - a21(k) * a31(k) ) / a22(k)
493	ELSE
494	a22(k) = 0.0_wp
495	a32(k) = 0.0_wp
496	ENDIF
497
498	!
499	!-- a31, a32, a33 must be calculated with interpolated a11, a21, a22 (d11,
500	!-- d21, d22) because of different vertical grid
501	IF ( k .le. nzt ) THEN
502	d11 = 0.5_wp * ( r11(k) + r11(k+1) )
503	IF ( d11 > 0.0_wp ) THEN
504	d11 = SQRT( d11 )
505	d21 = ( 0.5_wp * ( r21(k) + r21(k+1) ) ) / d11
506	a31(k) = r31(k) / d11
507	ELSE
508	d21 = 0.0_wp
509	a31(k) = 0.0_wp
510	ENDIF
511
512	d22 = 0.5_wp * ( r22(k) + r22(k+1) ) - d21 ** 2
513	IF ( d22 > 0.0_wp ) THEN
514	a32(k) = ( r32(k) - d21 * a31(k) ) / SQRT( d22 )
515	ELSE
516	a32(k) = 0.0_wp
517	ENDIF
518
519	a33(k) = r33(k) - a31(k) 2 - a32(k) 2
520	IF ( a33(k) > 0.0_wp ) THEN
521	a33(k) = SQRT( a33(k) )
522	ELSE
523	a33(k) = 0.0_wp
524	ENDIF
525	ELSE
526	a31(k) = a31(k-1)
527	a32(k) = a32(k-1)
528	a33(k) = a33(k-1)
529	ENDIF
530
531	ENDDO
532
533	!
534	!-- Define the size of the filter functions and allocate them.
535	merg = 0
536
537	! arrays must be large enough to cover the largest length scale
538	DO k = nzb, nzt+1
539	j = MAX( ABS(nuy(k)), ABS(nuz(k)), &
540	ABS(nvy(k)), ABS(nvz(k)), &
541	ABS(nwy(k)), ABS(nwz(k)) )
542	IF ( j > merg ) merg = j
543	ENDDO
544
545	merg = 2 * merg
546	mergp = merg + nbgp
547
548	ALLOCATE ( buy(-merg:merg,nzb:nzt+1), buz(-merg:merg,nzb:nzt+1), &
549	bvy(-merg:merg,nzb:nzt+1), bvz(-merg:merg,nzb:nzt+1), &
550	bwy(-merg:merg,nzb:nzt+1), bwz(-merg:merg,nzb:nzt+1) )
551
552	!
553	!-- Allocate velocity seeds
554	ALLOCATE ( fu( nzb:nzt+1,nysg:nyng), fuo(nzb:nzt+1,nysg:nyng), &
555	fv( nzb:nzt+1,nysg:nyng), fvo(nzb:nzt+1,nysg:nyng), &
556	fw( nzb:nzt+1,nysg:nyng), fwo(nzb:nzt+1,nysg:nyng) )
557
558	fu = 0._wp
559	fuo = 0._wp
560	fv = 0._wp
561	fvo = 0._wp
562	fw = 0._wp
563	fwo = 0._wp
564
565	!
566	!-- Create filter functions
567	CALL stg_filter_func( nuy, buy ) !filter uy
568	CALL stg_filter_func( nuz, buz ) !filter uz
569	CALL stg_filter_func( nvy, bvy ) !filter vy
570	CALL stg_filter_func( nvz, bvz ) !filter vz
571	CALL stg_filter_func( nwy, bwy ) !filter wy
572	CALL stg_filter_func( nwz, bwz ) !filter wz
573
574	#if defined( __parallel )
575	CALL MPI_BARRIER( comm2d, ierr )
576	#endif
577
578	!
579	!-- In case of restart, calculate velocity seeds fu, fv, fw from former
580	! time step.
581	! Bug: fu, fv, fw are different in those heights where a11, a22, a33
582	! are 0 compared to the prerun. This is mostly for k=nzt+1.
583	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
584	IF ( myidx == id_inflow ) THEN
585	DO j = nysg, nyng
586	DO k = nzb, nzt+1
587
588	IF ( a11(k) .NE. 0._wp ) THEN
589	fu(k,j) = ( u(k,j,-1) / mc_factor - &
590	mean_inflow_profiles(k,1) ) / a11(k)
591	ELSE
592	fu(k,j) = 0._wp
593	ENDIF
594
595	IF ( a22(k) .NE. 0._wp ) THEN
596	fv(k,j) = ( v(k,j,-1) / mc_factor - a21(k) * fu(k,j) - &
597	mean_inflow_profiles(k,2) ) / a22(k)
598	ELSE
599	fv(k,j) = 0._wp
600	ENDIF
601
602	IF ( a33(k) .NE. 0._wp ) THEN
603	fw(k,j) = ( w(k,j,-1) / mc_factor - a31(k) * fu(k,j) - &
604	a32(k) * fv(k,j) ) / a33(k)
605	ELSE
606	fw = 0._wp
607	ENDIF
608
609	ENDDO
610	ENDDO
611	ENDIF
612	ENDIF
613
614	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'stop' )
615
616	END SUBROUTINE stg_init
617
618
619	!------------------------------------------------------------------------------!
620	! Description:
621	! ------------
622	!> Calculate filter function bxx from length scale nxx following Eg.9 and 10
623	!> (Xie and Castro, 2008)
624	!------------------------------------------------------------------------------!
625	SUBROUTINE stg_filter_func( nxx, bxx )
626
627
628	IMPLICIT NONE
629
630	INTEGER(iwp) :: k !< loop index
631	INTEGER(iwp) :: n_k !< length scale nXX in height k
632	INTEGER(iwp) :: n_k2 !< n_k * 2
633	INTEGER(iwp) :: nf !< index for length scales
634
635	REAL(wp) :: bdenom !< denominator for filter functions bXX
636	REAL(wp) :: qsi = 1.0_wp !< minimization factor
637
638	INTEGER(iwp), DIMENSION(:) :: nxx(nzb:nzt+1) !< length scale (in gp)
639
640	REAL(wp), DIMENSION(:,:) :: bxx(-merg:merg,nzb:nzt+1) !< filter function
641
642
643	bxx = 0.0_wp
644
645	DO k = nzb, nzt+1
646	bdenom = 0.0_wp
647	n_k = nxx(k)
648	IF ( n_k /= 0 ) THEN
649	n_k2 = n_k * 2
650
651	!
652	!-- ( Eq.10 )^2
653	DO nf = -n_k2, n_k2
654	bdenom = bdenom + EXP( -qsi * pi * ABS(nf) / n_k )**2
655	ENDDO
656
657	!
658	!-- ( Eq.9 )
659	bdenom = SQRT( bdenom )
660	DO nf = -n_k2, n_k2
661	bxx(nf,k) = EXP( -qsi * pi * ABS(nf) / n_k ) / bdenom
662	ENDDO
663	ENDIF
664	ENDDO
665
666	END SUBROUTINE stg_filter_func
667
668
669	!------------------------------------------------------------------------------!
670	! Description:
671	! ------------
672	!> Parin for &stg_par for synthetic turbulence generator
673	!------------------------------------------------------------------------------!
674	SUBROUTINE stg_parin
675
676
677	IMPLICIT NONE
678
679	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
680
681
682	NAMELIST /stg_par/ use_syn_turb_gen
683
684	line = ' '
685
686	!
687	!-- Try to find stg package
688	REWIND ( 11 )
689	line = ' '
690	DO WHILE ( INDEX( line, '&stg_par' ) == 0 )
691	READ ( 11, '(A)', END=10 ) line
692	ENDDO
693	BACKSPACE ( 11 )
694
695	!
696	!-- Read namelist
697	READ ( 11, stg_par )
698
699	!
700	!-- Set flag that indicates that the synthetic turbulence generator is switched
701	!-- on
702	syn_turb_gen = .TRUE.
703
704	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
705	CALL stg_read_restart_data
706	ENDIF
707
708	10 CONTINUE
709
710	END SUBROUTINE stg_parin
711
712
713	!------------------------------------------------------------------------------!
714	! Description:
715	! ------------
716	!> Skipping the stg variables from restart-file (binary format).
717	!------------------------------------------------------------------------------!
718	SUBROUTINE stg_skip_var_list
719
720	IMPLICIT NONE
721
722	CHARACTER (LEN=1) :: cdum
723	CHARACTER (LEN=30) :: variable_chr
724
725	READ ( 13 ) variable_chr
726
727	DO WHILE ( TRIM( variable_chr ) /= '* end stg module *' )
728
729	READ ( 13 ) cdum
730	READ ( 13 ) variable_chr
731
732	ENDDO
733
734	END SUBROUTINE stg_skip_var_list
735
736
737	!------------------------------------------------------------------------------!
738	! Description:
739	! ------------
740	!> This routine reads the respective restart data.
741	!------------------------------------------------------------------------------!
742	SUBROUTINE stg_read_restart_data
743
744
745	IMPLICIT NONE
746
747	CHARACTER (LEN=30) :: variable_chr !< dummy variable to read string
748
749
750	READ ( 13 ) variable_chr
751	DO WHILE ( TRIM( variable_chr ) /= '* end stg module *' )
752
753	SELECT CASE ( TRIM( variable_chr ) )
754
755	CASE ( 'use_syn_turb_gen' )
756	READ ( 13 ) use_syn_turb_gen
757	CASE ( 'mc_factor' )
758	READ ( 13 ) mc_factor
759	CASE ( 'syn_turb_gen_prerun' )
760	READ ( 13 ) syn_turb_gen_prerun
761
762	END SELECT
763
764	READ ( 13 ) variable_chr
765
766	ENDDO
767
768	END SUBROUTINE stg_read_restart_data
769
770
771	!------------------------------------------------------------------------------!
772	! Description:
773	! ------------
774	!> This routine writes the respective restart data.
775	!------------------------------------------------------------------------------!
776	SUBROUTINE stg_write_restart_data
777
778
779	IMPLICIT NONE
780
781	syn_turb_gen_prerun = .TRUE.
782
783	WRITE ( 14 ) 'use_syn_turb_gen '
784	WRITE ( 14 ) use_syn_turb_gen
785	WRITE ( 14 ) 'mc_factor '
786	WRITE ( 14 ) mc_factor
787	WRITE ( 14 ) 'syn_turb_gen_prerun '
788	WRITE ( 14 ) syn_turb_gen_prerun
789
790	WRITE ( 14 ) '* end stg module * '
791
792	END SUBROUTINE stg_write_restart_data
793
794
795	!------------------------------------------------------------------------------!
796	! Description:
797	! ------------
798	!> Create turbulent inflow fields for u, v, w with prescribed length scales and
799	!> Reynolds stress tensor after a method of Xie and Castro (2008), modified
800	!> following suggestions of Kim et al. (2013), and using a Lund rotation
801	!> (Lund, 1998).
802	!------------------------------------------------------------------------------!
803	SUBROUTINE stg_main
804
805
806	USE arrays_3d, &
807	ONLY: dzw
808
809	USE control_parameters, &
810	ONLY: dt_3d, intermediate_timestep_count, simulated_time, &
811	volume_flow_initial
812
813	USE indices, &
814	ONLY: nyn, nys
815
816	USE statistics, &
817	ONLY: weight_substep
818
819
820	IMPLICIT NONE
821
822	INTEGER(iwp) :: j !< loop index in y-direction
823	INTEGER(iwp) :: k !< loop index in z-direction
824
825	REAL(wp) :: dt_stg !< wheighted subtimestep
826	REAL(wp) :: mc_factor_l !< local mass flux correction factor
827
828	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,5,nbgp) :: inflow_dist !< disturbance for inflow profiles
829
830
831	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'start' )
832
833	!
834	!-- Calculate time step which is needed for filter functions
835	dt_stg = dt_3d * weight_substep(intermediate_timestep_count)
836
837	!
838	!-- Initial value of fu, fv, fw
839	IF ( simulated_time == 0.0_wp .AND. .NOT. velocity_seed_initialized ) THEN
840	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fu )
841	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fv )
842	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fw )
843	velocity_seed_initialized = .TRUE.
844	ENDIF
845	!
846	!-- New set of fu, fv, fw
847	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fuo )
848	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fvo )
849	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fwo )
850
851	IF ( myidx == id_inflow ) THEN
852
853	DO j = nysg, nyng
854	DO k = nzb, nzt + 1
855	!
856	!-- Update fu, fv, fw following Eq. 14 of Xie and Castro (2008)
857	IF ( tu(k) == 0.0_wp ) THEN
858	fu(k,j) = fuo(k,j)
859	ELSE
860	fu(k,j) = fu(k,j) * EXP( -pi * dt_stg * 0.5_wp / tu(k) ) + &
861	fuo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tu(k) ) )
862	ENDIF
863
864	IF ( tv(k) == 0.0_wp ) THEN
865	fv(k,j) = fvo(k,j)
866	ELSE
867	fv(k,j) = fv(k,j) * EXP( -pi * dt_stg * 0.5_wp / tv(k) ) + &
868	fvo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tv(k) ) )
869	ENDIF
870
871	IF ( tw(k) == 0.0_wp ) THEN
872	fw(k,j) = fwo(k,j)
873	ELSE
874	fw(k,j) = fw(k,j) * EXP( -pi * dt_stg * 0.5_wp / tw(k) ) + &
875	fwo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tw(k) ) )
876	ENDIF
877	!
878	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
879	!-- Additional factors are added to improve the variance of v and w
880	IF( k == 0 ) THEN
881	inflow_dist(k,j,1,1) = 0.0_wp
882	inflow_dist(k,j,2,1) = 0.0_wp
883	inflow_dist(k,j,3,1) = 0.0_wp
884	inflow_dist(k,j,4,1) = 0.0_wp
885	inflow_dist(k,j,5,1) = 0.0_wp
886	ELSE
887	inflow_dist(k,j,1,1) = a11(k) * fu(k,j)
888	!experimental test of 1.2
889	inflow_dist(k,j,2,1) = ( SQRT( a22(k) / MAXVAL(a22) ) &
890	* 1.2_wp ) &
891	* ( a21(k) * fu(k,j) &
892	+ a22(k) * fv(k,j) )
893	inflow_dist(k,j,3,1) = ( SQRT(a33(k) / MAXVAL(a33) ) &
894	* 1.3_wp ) &
895	* ( a31(k) * fu(k,j) &
896	+ a32(k) * fv(k,j) &
897	+ a33(k) * fw(k,j) )
898	! Calculation for pt and e not yet implemented
899	inflow_dist(k,j,4,1) = 0.0_wp
900	inflow_dist(k,j,5,1) = 0.0_wp
901	ENDIF
902
903	ENDDO
904	ENDDO
905
906	!
907	!-- Mass flux correction following Kim et al. (2013)
908	!-- This correction factor insures that the mass flux is preserved at the
909	!-- inflow boundary
910	mc_factor_l = 0.0_wp
911	mc_factor = 0.0_wp
912	DO j = nys, nyn
913	DO k = nzb+1, nzt
914	mc_factor_l = mc_factor_l + dzw(k) * &
915	( mean_inflow_profiles(k,1) + inflow_dist(k,j,1,1) )
916	ENDDO
917	ENDDO
918
919	#if defined( __parallel )
920	CALL MPI_ALLREDUCE( mc_factor_l, mc_factor, &
921	1, MPI_REAL, MPI_SUM, comm1dy, ierr )
922	#else
923	mc_factor = mc_factor_l
924	#endif
925
926	mc_factor = volume_flow_initial(1) / mc_factor
927
928	!
929	!-- Add disturbance at the inflow
930	DO j = nysg, nyng
931	DO k = nzb, nzt+1
932	u(k,j,-nbgp+1:0) = ( mean_inflow_profiles(k,1) + &
933	inflow_dist(k,j,1,1) ) * mc_factor
934	v(k,j,-nbgp:-1) = ( mean_inflow_profiles(k,2) + &
935	inflow_dist(k,j,2,1) ) * mc_factor
936	w(k,j,-nbgp:-1) = inflow_dist(k,j,3,1) * mc_factor
937	ENDDO
938	ENDDO
939
940	ENDIF
941
942	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'stop' )
943
944	END SUBROUTINE stg_main
945
946
947	!------------------------------------------------------------------------------!
948	! Description:
949	! ------------
950	!> Generate a set of random number rand_it wich is equal on each PE
951	!> and calculate the velocity seed f_n.
952	!> f_n is splitted in vertical direction by the number of PEs in x-direction and
953	!> and each PE calculates a vertical subsection of f_n. At the the end, all
954	!> parts are collected to form the full array.
955	!------------------------------------------------------------------------------!
956	SUBROUTINE stg_generate_seed_yz( n_y, n_z, b_y, b_z, f_n )
957
958
959	USE indices, &
960	ONLY: ny
961
962
963	IMPLICIT NONE
964
965	INTEGER(iwp) :: j !< loop index in y-direction
966	INTEGER(iwp) :: jj !< loop index in y-direction
967	INTEGER(iwp) :: k !< loop index in z-direction
968	INTEGER(iwp) :: kk !< loop index in z-direction
969	INTEGER(iwp) :: send_count !< send count for MPI_GATHERV
970
971	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y !< length scale in y-direction
972	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z !< length scale in z-direction
973	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y2 !< n_y*2
974	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z2 !< n_z*2
975
976	REAL(wp) :: nyz_inv !< inverse of number of grid points in yz-slice
977	REAL(wp) :: rand_av !< average of random number
978	REAL(wp) :: rand_sigma_inv !< inverse of stdev of random number
979
980	REAL(wp), DIMENSION(-merg:merg,nzb:nzt+1) :: b_y !< filter func in y-dir
981	REAL(wp), DIMENSION(-merg:merg,nzb:nzt+1) :: b_z !< filter func in z-dir
982	REAL(wp), DIMENSION(nzb_x:nzt_x+1,nysg:nyng) :: f_n_l !< local velocity seed
983	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng) :: f_n !< velocity seed
984	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: rand_it !< random number
985
986
987	!
988	!-- Generate random numbers using a seed generated in stg_init.
989	!-- The set of random numbers are modified to have an average of 0 and
990	!-- unit variance.
991	ALLOCATE( rand_it(nzb-mergp:nzt+1+mergp,-mergp:ny+mergp) )
992
993	rand_av = 0.0_wp
994	rand_sigma_inv = 0.0_wp
995	nyz_inv = 1.0_wp / REAL( ( nzt+1 - nzb+1 ) * ( ny+1 ), KIND=wp )
996
997	DO j = 0, ny
998	DO k = nzb, nzt+1
999	CALL RANDOM_NUMBER( rand_it(k,j) )
1000	rand_av = rand_av + rand_it(k,j)
1001	ENDDO
1002	ENDDO
1003
1004	rand_av = rand_av * nyz_inv
1005
1006	DO j = 0, ny
1007	DO k = nzb, nzt+1
1008	rand_it(k,j) = rand_it(k,j) - rand_av
1009	rand_sigma_inv = rand_sigma_inv + rand_it(k,j) ** 2
1010	ENDDO
1011	ENDDO
1012
1013	rand_sigma_inv = 1.0_wp / SQRT(rand_sigma_inv * nyz_inv)
1014
1015	DO j = 0, ny
1016	DO k = nzb, nzt+1
1017	rand_it(k,j) = rand_it(k,j) * rand_sigma_inv
1018	ENDDO
1019	ENDDO
1020
1021	!
1022	!-- Periodic fill of random number in space
1023	DO j = 0, ny
1024	DO k = 1, mergp
1025	rand_it(nzb -k,j) = rand_it(nzt+2-k,j) ! bottom margin
1026	rand_it(nzt+1+k,j) = rand_it(nzb+k-1,j) ! top margin
1027	ENDDO
1028	ENDDO
1029	DO j = 1, mergp
1030	DO k = nzb-mergp, nzt+1+mergp
1031	rand_it(k, -j) = rand_it(k,ny-j+1) ! south margin
1032	rand_it(k,ny+j) = rand_it(k, j-1) ! north margin
1033	ENDDO
1034	ENDDO
1035
1036	!
1037	!-- Generate velocity seed following Eq.6 of Xie and Castro (2008)
1038	n_y2 = n_y * 2
1039	n_z2 = n_z * 2
1040	f_n_l = 0.0_wp
1041
1042	DO j = nysg, nyng
1043	DO k = nzb_x, nzt_x+1
1044	DO jj = -n_y2(k), n_y2(k)
1045	DO kk = -n_z2(k), n_z2(k)
1046	f_n_l(k,j) = f_n_l(k,j) &
1047	+ b_y(jj,k) * b_z(kk,k) * rand_it(k+kk,j+jj)
1048	ENDDO
1049	ENDDO
1050	ENDDO
1051	ENDDO
1052
1053	DEALLOCATE( rand_it )
1054
1055	!
1056	!-- Gather velocity seeds of full subdomain
1057	send_count = nzt_x - nzb_x + 1
1058	IF ( nzt_x == nzt ) send_count = send_count + 1
1059
1060	#if defined( __parallel )
1061	CALL MPI_GATHERV( f_n_l(nzb_x,nysg), send_count, stg_type_yz_small, &
1062	f_n(nzb+1,nysg), recv_count, displs, stg_type_yz, &
1063	id_inflow, comm1dx, ierr )
1064	#else
1065	f_n(nzb+1:nzt+1,nysg:nyng) = f_n_l(nzb_x:nzt_x+1,nysg:nyng)
1066	#endif
1067
1068
1069	END SUBROUTINE stg_generate_seed_yz
1070
1071	END MODULE synthetic_turbulence_generator_mod

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