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source: palm/trunk/SOURCE/time_integration.f90 @ 1393

Last change on this file since 1393 was 1385, checked in by raasch, 11 years ago
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[1]	1	SUBROUTINE time_integration
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later 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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[484]	20	! Current revisions:
[1092]	21	! ------------------
[1366]	22	!
[1385]	23	!
[1366]	24	! Former revisions:
	25	! -----------------
	26	! $Id: time_integration.f90 1385 2014-05-02 14:39:33Z raasch $
	27	!
[1385]	28	! 1384 2014-05-02 14:31:06Z raasch
	29	! location messages added
	30	!
[1381]	31	! 1380 2014-04-28 12:40:45Z heinze
	32	! CALL of nudge_ref added
	33	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
	34	!
[1366]	35	! 1365 2014-04-22 15:03:56Z boeske
[1365]	36	! Reset sums_ls_l to zero at each timestep
	37	! +sums_ls_l
	38	! Calculation of reference state (previously in subroutine calc_mean_profile)
	39
[1343]	40	! 1342 2014-03-26 17:04:47Z kanani
	41	! REAL constants defined as wp-kind
	42	!
[1321]	43	! 1320 2014-03-20 08:40:49Z raasch
[1320]	44	! ONLY-attribute added to USE-statements,
	45	! kind-parameters added to all INTEGER and REAL declaration statements,
	46	! kinds are defined in new module kinds,
	47	! old module precision_kind is removed,
	48	! revision history before 2012 removed,
	49	! comment fields (!:) to be used for variable explanations added to
	50	! all variable declaration statements
[1319]	51	! 1318 2014-03-17 13:35:16Z raasch
	52	! module interfaces removed
	53	!
[1309]	54	! 1308 2014-03-13 14:58:42Z fricke
	55	! +netcdf_data_format_save
	56	! For masked data, parallel netcdf output is not tested so far, hence
	57	! netcdf_data_format is switched back to non-paralell output.
	58	!
[1277]	59	! 1276 2014-01-15 13:40:41Z heinze
	60	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
	61	!
[1258]	62	! 1257 2013-11-08 15:18:40Z raasch
	63	! acc-update-host directive for timestep removed
	64	!
[1242]	65	! 1241 2013-10-30 11:36:58Z heinze
	66	! Generalize calc_mean_profile for wider use
	67	! Determine shf and qsws in dependence on data from LSF_DATA
	68	! Determine ug and vg in dependence on data from LSF_DATA
[1222]	69	! 1221 2013-09-10 08:59:13Z raasch
	70	! host update of arrays before timestep is called
	71	!
[1182]	72	! 1179 2013-06-14 05:57:58Z raasch
	73	! mean profiles for reference state are only calculated if required,
	74	! small bugfix for background communication
	75	!
[1172]	76	! 1171 2013-05-30 11:27:45Z raasch
	77	! split of prognostic_equations deactivated (comment lines), for the time being
	78	!
[1132]	79	! 1128 2013-04-12 06:19:32Z raasch
[1128]	80	! asynchronous transfer of ghost point data realized for acc-optimized version:
	81	! prognostic_equations are first called two times for those points required for
	82	! the left-right and north-south exchange, respectively, and then for the
	83	! remaining points,
	84	! those parts requiring global communication moved from prognostic_equations to
	85	! here
[392]	86	!
[1116]	87	! 1115 2013-03-26 18:16:16Z hoffmann
	88	! calculation of qr and nr is restricted to precipitation
	89	!
[1114]	90	! 1113 2013-03-10 02:48:14Z raasch
	91	! GPU-porting of boundary conditions,
	92	! openACC directives updated
	93	! formal parameter removed from routine boundary_conds
	94	!
[1112]	95	! 1111 2013-03-08 23:54:10Z raasch
	96	! +internal timestep counter for cpu statistics added,
	97	! openACC directives updated
	98	!
[1093]	99	! 1092 2013-02-02 11:24:22Z raasch
	100	! unused variables removed
	101	!
[1066]	102	! 1065 2012-11-22 17:42:36Z hoffmann
	103	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
	104	!
[1054]	105	! 1053 2012-11-13 17:11:03Z hoffmann
	106	! exchange of ghost points for nr, qr added
	107	!
[1037]	108	! 1036 2012-10-22 13:43:42Z raasch
	109	! code put under GPL (PALM 3.9)
	110	!
[1020]	111	! 1019 2012-09-28 06:46:45Z raasch
	112	! non-optimized version of prognostic_equations removed
	113	!
[1017]	114	! 1015 2012-09-27 09:23:24Z raasch
	115	! +call of prognostic_equations_acc
	116	!
[1002]	117	! 1001 2012-09-13 14:08:46Z raasch
	118	! all actions concerning leapfrog- and upstream-spline-scheme removed
	119	!
[850]	120	! 849 2012-03-15 10:35:09Z raasch
	121	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
	122	!
[826]	123	! 825 2012-02-19 03:03:44Z raasch
	124	! wang_collision_kernel renamed wang_kernel
	125	!
[1]	126	! Revision 1.1 1997/08/11 06:19:04 raasch
	127	! Initial revision
	128	!
	129	!
	130	! Description:
	131	! ------------
	132	! Integration in time of the model equations, statistical analysis and graphic
	133	! output
	134	!------------------------------------------------------------------------------!
	135
[1320]	136	USE advec_ws, &
	137	ONLY: ws_statistics
	138
	139	USE arrays_3d, &
[1380]	140	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
	141	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
	142	u_p, v, vpt, v_p, w_p
[1320]	143
[1365]	144	USE calc_mean_profile_mod, &
[1320]	145	ONLY: calc_mean_profile
	146
	147	USE control_parameters, &
	148	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
	149	average_count_sp, averaging_interval, averaging_interval_pr, &
[1380]	150	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
	151	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
	152	cloud_physics, constant_heatflux, create_disturbances, dopr_n, &
[1320]	153	constant_diffusion, coupling_mode, coupling_start_time, &
	154	current_timestep_number, disturbance_created, &
	155	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
	156	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
	157	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
	158	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
	159	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
	160	end_time, first_call_lpm, galilei_transformation, humidity, &
	161	icloud_scheme, intermediate_timestep_count, &
	162	intermediate_timestep_count_max, large_scale_forcing, &
	163	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
[1365]	164	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
	165	ocean, on_device, passive_scalar, prandtl_layer, precipitation, &
[1320]	166	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
	167	run_coupled, simulated_time, simulated_time_chr, &
	168	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
	169	skip_time_do3d, skip_time_domask, skip_time_dopr, &
	170	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
	171	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
	172	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
	173	time_do3d, time_domask, time_dopr, time_dopr_av, &
	174	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
	175	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
	176	time_run_control, time_since_reference_point, turbulence, &
	177	turbulent_inflow, use_initial_profile_as_reference, &
	178	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
	179	ws_scheme_sca
	180
	181	USE cpulog, &
	182	ONLY: cpu_log, log_point, log_point_s
	183
	184	USE indices, &
	185	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
[1380]	186	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
[1320]	187
	188	USE interaction_droplets_ptq_mod, &
	189	ONLY: interaction_droplets_ptq
	190
	191	USE kinds
	192
	193	USE ls_forcing_mod, &
	194	ONLY: ls_forcing_surf, ls_forcing_vert
	195
[1365]	196	USE nudge_mod, &
[1380]	197	ONLY: calc_tnudge, nudge_ref
[1365]	198
[1320]	199	USE particle_attributes, &
	200	ONLY: particle_advection, particle_advection_start, wang_kernel
	201
[1]	202	USE pegrid
	203
[1320]	204	USE production_e_mod, &
	205	ONLY: production_e_init
	206
	207	USE prognostic_equations_mod, &
	208	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
	209	prognostic_equations_vector
	210
	211	USE statistics, &
[1365]	212	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
[1320]	213
	214	USE user_actions_mod, &
	215	ONLY: user_actions
	216
[1]	217	IMPLICIT NONE
	218
[1320]	219	CHARACTER (LEN=9) :: time_to_string !:
[1]	220
[1320]	221	INTEGER(iwp) :: netcdf_data_format_save !:
	222
[1]	223	!
	224	!-- At the beginning of a simulation determine the time step as well as
	225	!-- determine and print out the run control parameters
[1342]	226	IF ( simulated_time == 0.0_wp ) CALL timestep
[667]	227
[1]	228	CALL run_control
	229
[667]	230
[108]	231	!
	232	!-- Data exchange between coupled models in case that a call has been omitted
	233	!-- at the end of the previous run of a job chain.
[291]	234	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
[108]	235	!
	236	!-- In case of model termination initiated by the local model the coupler
	237	!-- must not be called because this would again cause an MPI hang.
	238	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
	239	CALL surface_coupler
	240	time_coupling = time_coupling - dt_coupling
	241	ENDDO
[1342]	242	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
[348]	243	THEN
	244	time_coupling = time_since_reference_point
	245	ENDIF
[108]	246	ENDIF
	247
	248
[1]	249	#if defined( __dvrp_graphics )
	250	!
	251	!-- Time measurement with dvrp software
	252	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
	253	#endif
	254
[1384]	255	CALL location_message( 'beginning with time-stepping' )
[1]	256	!
	257	!-- Start of the time loop
	258	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
	259	.NOT. terminate_run )
	260
	261	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
[1221]	262
[1]	263	!
	264	!-- Determine size of next time step
[1342]	265	IF ( simulated_time /= 0.0_wp ) THEN
[1221]	266	CALL timestep
	267	ENDIF
	268
[1]	269	!
[1241]	270	!-- Determine ug, vg and w_subs in dependence on data from external file
	271	!-- LSF_DATA
[1365]	272	IF ( large_scale_forcing .AND. lsf_vert ) THEN
[1241]	273	CALL ls_forcing_vert ( simulated_time )
[1365]	274	sums_ls_l = 0.0_wp
[1241]	275	ENDIF
	276
	277	!
[1380]	278	!-- Set pt_init and q_init to the current profiles taken from
	279	!-- NUDGING_DATA
	280	IF ( nudging ) THEN
	281	CALL nudge_ref ( simulated_time )
	282	!
	283	!-- Store temperature gradient at the top boundary for possible Neumann
	284	!-- boundary condition
	285	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
	286	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
	287	ENDIF
	288
	289	!
[1]	290	!-- Execute the user-defined actions
	291	CALL user_actions( 'before_timestep' )
	292
	293	!
	294	!-- Start of intermediate step loop
	295	intermediate_timestep_count = 0
	296	DO WHILE ( intermediate_timestep_count < &
	297	intermediate_timestep_count_max )
	298
	299	intermediate_timestep_count = intermediate_timestep_count + 1
	300
	301	!
	302	!-- Set the steering factors for the prognostic equations which depend
	303	!-- on the timestep scheme
	304	CALL timestep_scheme_steering
	305
	306	!
[1128]	307	!-- Calculate those variables needed in the tendency terms which need
	308	!-- global communication
[1179]	309	IF ( .NOT. use_single_reference_value .AND. &
	310	.NOT. use_initial_profile_as_reference ) THEN
	311	!
	312	!-- Horizontally averaged profiles to be used as reference state in
	313	!-- buoyancy terms (WARNING: only the respective last call of
	314	!-- calc_mean_profile defines the reference state!)
[1365]	315	IF ( .NOT. neutral ) THEN
	316	CALL calc_mean_profile( pt, 4 )
	317	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
	318	ENDIF
	319	IF ( ocean ) THEN
	320	CALL calc_mean_profile( rho, 64 )
	321	ref_state(:) = hom(:,1,64,0)
	322	ENDIF
	323	IF ( humidity ) THEN
	324	CALL calc_mean_profile( vpt, 44 )
	325	ref_state(:) = hom(:,1,44,0)
	326	ENDIF
	327
[1179]	328	ENDIF
	329
[1128]	330	IF ( .NOT. constant_diffusion ) CALL production_e_init
	331	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
	332	intermediate_timestep_count == 1 ) CALL ws_statistics
[1365]	333	!
	334	!-- In case of nudging calculate current nudging time scale and horizontal
[1380]	335	!-- means of u, v, pt and q
[1365]	336	IF ( nudging ) THEN
	337	CALL calc_tnudge( simulated_time )
	338	CALL calc_mean_profile( u, 1 )
	339	CALL calc_mean_profile( v, 2 )
	340	CALL calc_mean_profile( pt, 4 )
	341	CALL calc_mean_profile( q, 41 )
	342	ENDIF
[1128]	343
	344	!
[1]	345	!-- Solve the prognostic equations. A fast cache optimized version with
	346	!-- only one single loop is used in case of Piascek-Williams advection
	347	!-- scheme. NEC vector machines use a different version, because
	348	!-- in the other versions a good vectorization is prohibited due to
	349	!-- inlining problems.
[1019]	350	IF ( loop_optimization == 'cache' ) THEN
	351	CALL prognostic_equations_cache
	352	ELSEIF ( loop_optimization == 'vector' ) THEN
[63]	353	CALL prognostic_equations_vector
[1015]	354	ELSEIF ( loop_optimization == 'acc' ) THEN
[1171]	355	i_left = nxl; i_right = nxr
	356	j_south = nys; j_north = nyn
	357	CALL prognostic_equations_acc
	358
	359	! i_left = nxl; i_right = nxl+nbgp-1
[1128]	360	! j_south = nys; j_north = nyn
	361	! CALL prognostic_equations_acc
[1171]	362	! i_left = nxr-nbgp+1; i_right = nxr
	363	! j_south = nys; j_north = nyn
	364	! CALL prognostic_equations_acc
[1128]	365
	366	!
	367	!-- Exchange of ghost points (lateral boundary conditions)
	368	IF ( background_communication ) THEN
	369
	370	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
	371
	372	send_receive = 'lr'
	373	sendrecv_in_background = .TRUE.
	374	req = 0
	375	req_count = 0
	376
	377	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	378	on_device = .TRUE. ! to be removed after complete porting
	379	ELSE ! of ghost point exchange
	380	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
	381	ENDIF
	382
	383	CALL exchange_horiz( u_p, nbgp )
	384	CALL exchange_horiz( v_p, nbgp )
	385	CALL exchange_horiz( w_p, nbgp )
	386	CALL exchange_horiz( pt_p, nbgp )
	387	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
	388	IF ( ocean ) THEN
	389	CALL exchange_horiz( sa_p, nbgp )
	390	CALL exchange_horiz( rho, nbgp )
	391	CALL exchange_horiz( prho, nbgp )
	392	ENDIF
	393	IF (humidity .OR. passive_scalar) THEN
	394	CALL exchange_horiz( q_p, nbgp )
	395	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
	396	CALL exchange_horiz( qr_p, nbgp )
	397	CALL exchange_horiz( nr_p, nbgp )
	398	ENDIF
	399	ENDIF
	400	IF ( cloud_droplets ) THEN
	401	CALL exchange_horiz( ql, nbgp )
	402	CALL exchange_horiz( ql_c, nbgp )
	403	CALL exchange_horiz( ql_v, nbgp )
	404	CALL exchange_horiz( ql_vp, nbgp )
	405	ENDIF
	406	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
	407
	408	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	409	on_device = .FALSE. ! to be removed after complete porting
	410	ELSE ! of ghost point exchange
	411	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
	412	ENDIF
	413
	414	sendrecv_in_background = .FALSE.
	415
	416	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
	417
	418	ENDIF
	419
[1171]	420	! i_left = nxl+nbgp; i_right = nxr-nbgp
	421	! j_south = nys; j_north = nys+nbgp-1
	422	! CALL prognostic_equations_acc
	423	! i_left = nxl+nbgp; i_right = nxr-nbgp
	424	! j_south = nyn-nbgp+1; j_north = nyn
	425	! CALL prognostic_equations_acc
[1128]	426
	427	IF ( background_communication ) THEN
	428	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
	429	#if defined( __parallel )
	430	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
	431	#endif
	432	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
	433
	434	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
	435
	436	send_receive = 'ns'
	437	sendrecv_in_background = .TRUE.
	438	req = 0
	439	req_count = 0
	440
	441	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	442	on_device = .TRUE. ! to be removed after complete porting
	443	ELSE ! of ghost point exchange
	444	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
	445	ENDIF
	446
	447	CALL exchange_horiz( u_p, nbgp )
	448	CALL exchange_horiz( v_p, nbgp )
	449	CALL exchange_horiz( w_p, nbgp )
	450	CALL exchange_horiz( pt_p, nbgp )
	451	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
	452	IF ( ocean ) THEN
	453	CALL exchange_horiz( sa_p, nbgp )
	454	CALL exchange_horiz( rho, nbgp )
	455	CALL exchange_horiz( prho, nbgp )
	456	ENDIF
	457	IF (humidity .OR. passive_scalar) THEN
	458	CALL exchange_horiz( q_p, nbgp )
	459	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
	460	CALL exchange_horiz( qr_p, nbgp )
	461	CALL exchange_horiz( nr_p, nbgp )
	462	ENDIF
	463	ENDIF
	464	IF ( cloud_droplets ) THEN
	465	CALL exchange_horiz( ql, nbgp )
	466	CALL exchange_horiz( ql_c, nbgp )
	467	CALL exchange_horiz( ql_v, nbgp )
	468	CALL exchange_horiz( ql_vp, nbgp )
	469	ENDIF
	470	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
	471
	472	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	473	on_device = .FALSE. ! to be removed after complete porting
	474	ELSE ! of ghost point exchange
	475	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
	476	ENDIF
	477
	478	sendrecv_in_background = .FALSE.
	479
	480	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
	481
	482	ENDIF
	483
[1171]	484	! i_left = nxl+nbgp; i_right = nxr-nbgp
	485	! j_south = nys+nbgp; j_north = nyn-nbgp
	486	! CALL prognostic_equations_acc
[1128]	487
	488	IF ( background_communication ) THEN
	489	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
	490	#if defined( __parallel )
	491	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
	492	#endif
	493	send_receive = 'al'
	494	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
	495	ENDIF
	496
[1]	497	ENDIF
	498
	499	!
[849]	500	!-- Particle transport/physics with the Lagrangian particle model
	501	!-- (only once during intermediate steps, because it uses an Euler-step)
[1128]	502	!-- ### particle model should be moved before prognostic_equations, in order
	503	!-- to regard droplet interactions directly
[63]	504	IF ( particle_advection .AND. &
	505	simulated_time >= particle_advection_start .AND. &
[1]	506	intermediate_timestep_count == 1 ) THEN
[849]	507	CALL lpm
	508	first_call_lpm = .FALSE.
[1]	509	ENDIF
	510
	511	!
	512	!-- Interaction of droplets with temperature and specific humidity.
	513	!-- Droplet condensation and evaporation is calculated within
	514	!-- advec_particles.
	515	IF ( cloud_droplets .AND. &
	516	intermediate_timestep_count == intermediate_timestep_count_max )&
	517	THEN
	518	CALL interaction_droplets_ptq
	519	ENDIF
	520
	521	!
	522	!-- Exchange of ghost points (lateral boundary conditions)
[1128]	523	IF ( .NOT. background_communication ) THEN
[1113]	524
[1128]	525	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
[1113]	526
[1128]	527	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	528	on_device = .TRUE. ! to be removed after complete porting
	529	ELSE ! of ghost point exchange
	530	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
[1053]	531	ENDIF
[1]	532
[1128]	533	CALL exchange_horiz( u_p, nbgp )
	534	CALL exchange_horiz( v_p, nbgp )
	535	CALL exchange_horiz( w_p, nbgp )
	536	CALL exchange_horiz( pt_p, nbgp )
	537	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
	538	IF ( ocean ) THEN
	539	CALL exchange_horiz( sa_p, nbgp )
	540	CALL exchange_horiz( rho, nbgp )
	541	CALL exchange_horiz( prho, nbgp )
	542	ENDIF
	543	IF (humidity .OR. passive_scalar) THEN
	544	CALL exchange_horiz( q_p, nbgp )
[1179]	545	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
	546	precipitation ) THEN
[1128]	547	CALL exchange_horiz( qr_p, nbgp )
	548	CALL exchange_horiz( nr_p, nbgp )
	549	ENDIF
	550	ENDIF
	551	IF ( cloud_droplets ) THEN
	552	CALL exchange_horiz( ql, nbgp )
	553	CALL exchange_horiz( ql_c, nbgp )
	554	CALL exchange_horiz( ql_v, nbgp )
	555	CALL exchange_horiz( ql_vp, nbgp )
	556	ENDIF
	557	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
	558
	559	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	560	on_device = .FALSE. ! to be removed after complete porting
	561	ELSE ! of ghost point exchange
	562	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
	563	ENDIF
	564
	565	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
	566
[1113]	567	ENDIF
	568
[1]	569	!
	570	!-- Boundary conditions for the prognostic quantities (except of the
	571	!-- velocities at the outflow in case of a non-cyclic lateral wall)
[1113]	572	CALL boundary_conds
[1]	573
	574	!
[73]	575	!-- Swap the time levels in preparation for the next time step.
	576	CALL swap_timelevel
	577
	578	!
[1]	579	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
	580	!-- when a sloping surface is used
	581	IF ( sloping_surface ) THEN
[707]	582	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
	583	pt_slope_offset
	584	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
	585	pt_slope_offset
[1]	586	ENDIF
	587
	588	!
[151]	589	!-- Impose a turbulent inflow using the recycling method
	590	IF ( turbulent_inflow ) CALL inflow_turbulence
	591
	592	!
[1]	593	!-- Impose a random perturbation on the horizontal velocity field
[106]	594	IF ( create_disturbances .AND. &
	595	( call_psolver_at_all_substeps .AND. &
[1]	596	intermediate_timestep_count == intermediate_timestep_count_max )&
[106]	597	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
	598	intermediate_timestep_count == 1 ) ) &
[1]	599	THEN
	600	time_disturb = time_disturb + dt_3d
	601	IF ( time_disturb >= dt_disturb ) THEN
[1111]	602	!$acc update host( u, v )
[1113]	603	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
[87]	604	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
[75]	605	CALL disturb_field( nzb_u_inner, tend, u )
	606	CALL disturb_field( nzb_v_inner, tend, v )
[707]	607	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
[1]	608	!
	609	!-- Runs with a non-cyclic lateral wall need perturbations
	610	!-- near the inflow throughout the whole simulation
	611	dist_range = 1
[75]	612	CALL disturb_field( nzb_u_inner, tend, u )
	613	CALL disturb_field( nzb_v_inner, tend, v )
[1]	614	dist_range = 0
	615	ENDIF
[1113]	616	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
[1111]	617	!$acc update device( u, v )
[1]	618	time_disturb = time_disturb - dt_disturb
	619	ENDIF
	620	ENDIF
	621
	622	!
	623	!-- Reduce the velocity divergence via the equation for perturbation
	624	!-- pressure.
[106]	625	IF ( intermediate_timestep_count == 1 .OR. &
	626	call_psolver_at_all_substeps ) THEN
[1]	627	CALL pres
	628	ENDIF
	629
	630	!
	631	!-- If required, compute liquid water content
[1015]	632	IF ( cloud_physics ) THEN
	633	CALL calc_liquid_water_content
	634	!$acc update device( ql )
	635	ENDIF
[1115]	636	!
	637	!-- If required, compute virtual potential temperature
	638	IF ( humidity ) THEN
	639	CALL compute_vpt
	640	!$acc update device( vpt )
	641	ENDIF
[1]	642	!
	643	!-- Compute the diffusion quantities
	644	IF ( .NOT. constant_diffusion ) THEN
	645
	646	!
[1276]	647	!-- Determine surface fluxes shf and qsws and surface values
	648	!-- pt_surface and q_surface in dependence on data from external
	649	!-- file LSF_DATA respectively
	650	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
	651	intermediate_timestep_count == intermediate_timestep_count_max )&
	652	THEN
	653	CALL ls_forcing_surf ( simulated_time )
	654	ENDIF
	655
	656	!
[1]	657	!-- First the vertical fluxes in the Prandtl layer are being computed
	658	IF ( prandtl_layer ) THEN
	659	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
	660	CALL prandtl_fluxes
	661	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
	662	ENDIF
[1241]	663
[1]	664	!
	665	!-- Compute the diffusion coefficients
	666	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
[75]	667	IF ( .NOT. humidity ) THEN
[97]	668	IF ( ocean ) THEN
[388]	669	CALL diffusivities( prho, prho_reference )
[97]	670	ELSE
	671	CALL diffusivities( pt, pt_reference )
	672	ENDIF
[1]	673	ELSE
[97]	674	CALL diffusivities( vpt, pt_reference )
[1]	675	ENDIF
	676	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
	677
	678	ENDIF
	679
	680	ENDDO ! Intermediate step loop
	681
	682	!
	683	!-- Increase simulation time and output times
[1111]	684	nr_timesteps_this_run = nr_timesteps_this_run + 1
[291]	685	current_timestep_number = current_timestep_number + 1
	686	simulated_time = simulated_time + dt_3d
	687	simulated_time_chr = time_to_string( simulated_time )
	688	time_since_reference_point = simulated_time - coupling_start_time
	689
[1]	690	IF ( simulated_time >= skip_time_data_output_av ) THEN
	691	time_do_av = time_do_av + dt_3d
	692	ENDIF
	693	IF ( simulated_time >= skip_time_do2d_xy ) THEN
	694	time_do2d_xy = time_do2d_xy + dt_3d
	695	ENDIF
	696	IF ( simulated_time >= skip_time_do2d_xz ) THEN
	697	time_do2d_xz = time_do2d_xz + dt_3d
	698	ENDIF
	699	IF ( simulated_time >= skip_time_do2d_yz ) THEN
	700	time_do2d_yz = time_do2d_yz + dt_3d
	701	ENDIF
	702	IF ( simulated_time >= skip_time_do3d ) THEN
	703	time_do3d = time_do3d + dt_3d
	704	ENDIF
[410]	705	DO mid = 1, masks
	706	IF ( simulated_time >= skip_time_domask(mid) ) THEN
	707	time_domask(mid)= time_domask(mid) + dt_3d
	708	ENDIF
	709	ENDDO
[1]	710	time_dvrp = time_dvrp + dt_3d
	711	IF ( simulated_time >= skip_time_dosp ) THEN
	712	time_dosp = time_dosp + dt_3d
	713	ENDIF
	714	time_dots = time_dots + dt_3d
[849]	715	IF ( .NOT. first_call_lpm ) THEN
[1]	716	time_dopts = time_dopts + dt_3d
	717	ENDIF
	718	IF ( simulated_time >= skip_time_dopr ) THEN
	719	time_dopr = time_dopr + dt_3d
	720	ENDIF
	721	time_dopr_listing = time_dopr_listing + dt_3d
	722	time_run_control = time_run_control + dt_3d
	723
	724	!
[102]	725	!-- Data exchange between coupled models
[291]	726	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
[102]	727	time_coupling = time_coupling + dt_3d
[343]	728
[108]	729	!
	730	!-- In case of model termination initiated by the local model
	731	!-- (terminate_coupled > 0), the coupler must be skipped because it would
	732	!-- cause an MPI intercomminucation hang.
	733	!-- If necessary, the coupler will be called at the beginning of the
	734	!-- next restart run.
	735	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
[102]	736	CALL surface_coupler
	737	time_coupling = time_coupling - dt_coupling
	738	ENDDO
	739	ENDIF
	740
	741	!
[46]	742	!-- Execute user-defined actions
	743	CALL user_actions( 'after_integration' )
	744
	745	!
[1]	746	!-- If Galilei transformation is used, determine the distance that the
	747	!-- model has moved so far
	748	IF ( galilei_transformation ) THEN
	749	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
	750	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
	751	ENDIF
	752
	753	!
	754	!-- Check, if restart is necessary (because cpu-time is expiring or
	755	!-- because it is forced by user) and set stop flag
[108]	756	!-- This call is skipped if the remote model has already initiated a restart.
	757	IF ( .NOT. terminate_run ) CALL check_for_restart
[1]	758
	759	!
	760	!-- Carry out statistical analysis and output at the requested output times.
	761	!-- The MOD function is used for calculating the output time counters (like
	762	!-- time_dopr) in order to regard a possible decrease of the output time
	763	!-- interval in case of restart runs
	764
	765	!
	766	!-- Set a flag indicating that so far no statistics have been created
	767	!-- for this time step
	768	flow_statistics_called = .FALSE.
	769
	770	!
	771	!-- If required, call flow_statistics for averaging in time
[1342]	772	IF ( averaging_interval_pr /= 0.0_wp .AND. &
[1]	773	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
	774	simulated_time >= skip_time_dopr ) THEN
	775	time_dopr_av = time_dopr_av + dt_3d
	776	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
	777	do_sum = .TRUE.
	778	time_dopr_av = MOD( time_dopr_av, &
	779	MAX( dt_averaging_input_pr, dt_3d ) )
	780	ENDIF
	781	ENDIF
	782	IF ( do_sum ) CALL flow_statistics
	783
	784	!
[410]	785	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
[1342]	786	IF ( averaging_interval /= 0.0_wp .AND. &
[1]	787	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
	788	simulated_time >= skip_time_data_output_av ) &
	789	THEN
	790	time_do_sla = time_do_sla + dt_3d
	791	IF ( time_do_sla >= dt_averaging_input ) THEN
	792	CALL sum_up_3d_data
	793	average_count_3d = average_count_3d + 1
	794	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
	795	ENDIF
	796	ENDIF
	797
	798	!
	799	!-- Calculate spectra for time averaging
[1342]	800	IF ( averaging_interval_sp /= 0.0_wp .AND. &
[1]	801	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
	802	simulated_time >= skip_time_dosp ) THEN
	803	time_dosp_av = time_dosp_av + dt_3d
	804	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
	805	CALL calc_spectra
	806	time_dosp_av = MOD( time_dosp_av, &
	807	MAX( dt_averaging_input_pr, dt_3d ) )
	808	ENDIF
	809	ENDIF
	810
	811	!
	812	!-- Computation and output of run control parameters.
[1001]	813	!-- This is also done whenever perturbations have been imposed
[1]	814	IF ( time_run_control >= dt_run_control .OR. &
[1001]	815	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
[1]	816	THEN
	817	CALL run_control
	818	IF ( time_run_control >= dt_run_control ) THEN
	819	time_run_control = MOD( time_run_control, &
	820	MAX( dt_run_control, dt_3d ) )
	821	ENDIF
	822	ENDIF
	823
	824	!
	825	!-- Profile output (ASCII) on file
	826	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
	827	CALL print_1d
	828	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
	829	dt_3d ) )
	830	ENDIF
	831
	832	!
	833	!-- Graphic output for PROFIL
	834	IF ( time_dopr >= dt_dopr ) THEN
	835	IF ( dopr_n /= 0 ) CALL data_output_profiles
	836	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
[1342]	837	time_dopr_av = 0.0_wp ! due to averaging (see above)
[1]	838	ENDIF
	839
	840	!
	841	!-- Graphic output for time series
	842	IF ( time_dots >= dt_dots ) THEN
[48]	843	CALL data_output_tseries
[1]	844	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
	845	ENDIF
	846
	847	!
	848	!-- Output of spectra (formatted for use with PROFIL), in case of no
	849	!-- time averaging, spectra has to be calculated before
	850	IF ( time_dosp >= dt_dosp ) THEN
	851	IF ( average_count_sp == 0 ) CALL calc_spectra
	852	CALL data_output_spectra
	853	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
	854	ENDIF
	855
	856	!
	857	!-- 2d-data output (cross-sections)
	858	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
	859	CALL data_output_2d( 'xy', 0 )
	860	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
	861	ENDIF
	862	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
	863	CALL data_output_2d( 'xz', 0 )
	864	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
	865	ENDIF
	866	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
	867	CALL data_output_2d( 'yz', 0 )
	868	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
	869	ENDIF
	870
	871	!
	872	!-- 3d-data output (volume data)
	873	IF ( time_do3d >= dt_do3d ) THEN
	874	CALL data_output_3d( 0 )
	875	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
	876	ENDIF
	877
	878	!
[410]	879	!-- masked data output
[1308]	880	!-- Parallel netcdf output is not tested so far for masked data, hence
	881	!-- netcdf_data_format is switched back to non-paralell output.
	882	netcdf_data_format_save = netcdf_data_format
	883	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
	884	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
[410]	885	DO mid = 1, masks
	886	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
	887	CALL data_output_mask( 0 )
	888	time_domask(mid) = MOD( time_domask(mid), &
	889	MAX( dt_domask(mid), dt_3d ) )
	890	ENDIF
	891	ENDDO
[1308]	892	netcdf_data_format = netcdf_data_format_save
[410]	893
	894	!
	895	!-- Output of time-averaged 2d/3d/masked data
[1]	896	IF ( time_do_av >= dt_data_output_av ) THEN
	897	CALL average_3d_data
	898	CALL data_output_2d( 'xy', 1 )
	899	CALL data_output_2d( 'xz', 1 )
	900	CALL data_output_2d( 'yz', 1 )
	901	CALL data_output_3d( 1 )
[1308]	902	!-- Parallel netcdf output is not tested so far for masked data, hence
	903	!-- netcdf_data_format is switched back to non-paralell output.
	904	netcdf_data_format_save = netcdf_data_format
	905	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
	906	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
[410]	907	DO mid = 1, masks
	908	CALL data_output_mask( 1 )
	909	ENDDO
[1308]	910	netcdf_data_format = netcdf_data_format_save
[1]	911	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
	912	ENDIF
	913
	914	!
	915	!-- Output of particle time series
[253]	916	IF ( particle_advection ) THEN
	917	IF ( time_dopts >= dt_dopts .OR. &
	918	( simulated_time >= particle_advection_start .AND. &
[849]	919	first_call_lpm ) ) THEN
[253]	920	CALL data_output_ptseries
	921	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
	922	ENDIF
[1]	923	ENDIF
	924
	925	!
	926	!-- Output of dvrp-graphics (isosurface, particles, slicer)
	927	#if defined( __dvrp_graphics )
	928	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
	929	#endif
	930	IF ( time_dvrp >= dt_dvrp ) THEN
	931	CALL data_output_dvrp
	932	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
	933	ENDIF
	934	#if defined( __dvrp_graphics )
	935	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
	936	#endif
	937
	938	!
	939	!-- If required, set the heat flux for the next time step at a random value
	940	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
	941
	942	!
	943	!-- Execute user-defined actions
	944	CALL user_actions( 'after_timestep' )
	945
	946	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
	947
[667]	948
[1]	949	ENDDO ! time loop
	950
	951	#if defined( __dvrp_graphics )
	952	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
	953	#endif
	954
[1384]	955	CALL location_message( 'finished time-stepping' )
	956
[1]	957	END SUBROUTINE time_integration

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