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1	!> @file time_integration.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2015 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: time_integration.f90 1765 2016-02-28 13:30:40Z hoffmann $
26	!
27	! 1764 2016-02-28 12:45:19Z raasch
28	! PMC_ACTIVE flags removed,
29	! bugfix: nest synchronization after first call of timestep
30	!
31	! 1762 2016-02-25 12:31:13Z hellstea
32	! Introduction of nested domain feature
33	!
34	! 1736 2015-12-04 08:56:33Z raasch
35	! no perturbations added to total domain if energy limit has been set zero
36	!
37	! 1691 2015-10-26 16:17:44Z maronga
38	! Added option for spin-ups without land surface and radiation models. Moved calls
39	! for radiation and lan surface schemes.
40	!
41	! 1682 2015-10-07 23:56:08Z knoop
42	! Code annotations made doxygen readable
43	!
44	! 1671 2015-09-25 03:29:37Z raasch
45	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
46	! for particles
47	!
48	! 1585 2015-04-30 07:05:52Z maronga
49	! Moved call of radiation scheme. Added support for RRTM
50	!
51	! 1551 2015-03-03 14:18:16Z maronga
52	! Added interface for different radiation schemes.
53	!
54	! 1496 2014-12-02 17:25:50Z maronga
55	! Added calls for the land surface model and radiation scheme
56	!
57	! 1402 2014-05-09 14:25:13Z raasch
58	! location messages modified
59	!
60	! 1384 2014-05-02 14:31:06Z raasch
61	! location messages added
62	!
63	! 1380 2014-04-28 12:40:45Z heinze
64	! CALL of nudge_ref added
65	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
66	!
67	! 1365 2014-04-22 15:03:56Z boeske
68	! Reset sums_ls_l to zero at each timestep
69	! +sums_ls_l
70	! Calculation of reference state (previously in subroutine calc_mean_profile)
71
72	! 1342 2014-03-26 17:04:47Z kanani
73	! REAL constants defined as wp-kind
74	!
75	! 1320 2014-03-20 08:40:49Z raasch
76	! ONLY-attribute added to USE-statements,
77	! kind-parameters added to all INTEGER and REAL declaration statements,
78	! kinds are defined in new module kinds,
79	! old module precision_kind is removed,
80	! revision history before 2012 removed,
81	! comment fields (!:) to be used for variable explanations added to
82	! all variable declaration statements
83	! 1318 2014-03-17 13:35:16Z raasch
84	! module interfaces removed
85	!
86	! 1308 2014-03-13 14:58:42Z fricke
87	! +netcdf_data_format_save
88	! For masked data, parallel netcdf output is not tested so far, hence
89	! netcdf_data_format is switched back to non-paralell output.
90	!
91	! 1276 2014-01-15 13:40:41Z heinze
92	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
93	!
94	! 1257 2013-11-08 15:18:40Z raasch
95	! acc-update-host directive for timestep removed
96	!
97	! 1241 2013-10-30 11:36:58Z heinze
98	! Generalize calc_mean_profile for wider use
99	! Determine shf and qsws in dependence on data from LSF_DATA
100	! Determine ug and vg in dependence on data from LSF_DATA
101	! 1221 2013-09-10 08:59:13Z raasch
102	! host update of arrays before timestep is called
103	!
104	! 1179 2013-06-14 05:57:58Z raasch
105	! mean profiles for reference state are only calculated if required,
106	! small bugfix for background communication
107	!
108	! 1171 2013-05-30 11:27:45Z raasch
109	! split of prognostic_equations deactivated (comment lines), for the time being
110	!
111	! 1128 2013-04-12 06:19:32Z raasch
112	! asynchronous transfer of ghost point data realized for acc-optimized version:
113	! prognostic_equations are first called two times for those points required for
114	! the left-right and north-south exchange, respectively, and then for the
115	! remaining points,
116	! those parts requiring global communication moved from prognostic_equations to
117	! here
118	!
119	! 1115 2013-03-26 18:16:16Z hoffmann
120	! calculation of qr and nr is restricted to precipitation
121	!
122	! 1113 2013-03-10 02:48:14Z raasch
123	! GPU-porting of boundary conditions,
124	! openACC directives updated
125	! formal parameter removed from routine boundary_conds
126	!
127	! 1111 2013-03-08 23:54:10Z raasch
128	! +internal timestep counter for cpu statistics added,
129	! openACC directives updated
130	!
131	! 1092 2013-02-02 11:24:22Z raasch
132	! unused variables removed
133	!
134	! 1065 2012-11-22 17:42:36Z hoffmann
135	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
136	!
137	! 1053 2012-11-13 17:11:03Z hoffmann
138	! exchange of ghost points for nr, qr added
139	!
140	! 1036 2012-10-22 13:43:42Z raasch
141	! code put under GPL (PALM 3.9)
142	!
143	! 1019 2012-09-28 06:46:45Z raasch
144	! non-optimized version of prognostic_equations removed
145	!
146	! 1015 2012-09-27 09:23:24Z raasch
147	! +call of prognostic_equations_acc
148	!
149	! 1001 2012-09-13 14:08:46Z raasch
150	! all actions concerning leapfrog- and upstream-spline-scheme removed
151	!
152	! 849 2012-03-15 10:35:09Z raasch
153	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
154	!
155	! 825 2012-02-19 03:03:44Z raasch
156	! wang_collision_kernel renamed wang_kernel
157	!
158	! Revision 1.1 1997/08/11 06:19:04 raasch
159	! Initial revision
160	!
161	!
162	! Description:
163	! ------------
164	!> Integration in time of the model equations, statistical analysis and graphic
165	!> output
166	!------------------------------------------------------------------------------!
167	SUBROUTINE time_integration
168
169
170	USE advec_ws, &
171	ONLY: ws_statistics
172
173	USE arrays_3d, &
174	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
175	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, &
176	u, u_p, v, vpt, v_p, w, w_p
177
178	USE calc_mean_profile_mod, &
179	ONLY: calc_mean_profile
180
181	USE control_parameters, &
182	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
183	average_count_sp, averaging_interval, averaging_interval_pr, &
184	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
185	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
186	cloud_physics, constant_flux_layer, constant_heatflux, &
187	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
188	coupling_start_time, current_timestep_number, &
189	disturbance_created, disturbance_energy_limit, dist_range, &
190	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
191	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
192	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
193	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
194	end_time, first_call_lpm, galilei_transformation, humidity, &
195	icloud_scheme, intermediate_timestep_count, &
196	intermediate_timestep_count_max, large_scale_forcing, &
197	loop_optimization, lsf_surf, lsf_vert, masks, mid, nest_domain, &
198	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
199	ocean, on_device, passive_scalar, precipitation, &
200	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
201	run_coupled, simulated_time, simulated_time_chr, &
202	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
203	skip_time_do3d, skip_time_domask, skip_time_dopr, &
204	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
205	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
206	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
207	time_do3d, time_domask, time_dopr, time_dopr_av, &
208	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
209	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
210	time_run_control, time_since_reference_point, &
211	turbulence, &
212	turbulent_inflow, use_initial_profile_as_reference, &
213	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
214	ws_scheme_sca
215
216	USE cpulog, &
217	ONLY: cpu_log, log_point, log_point_s
218
219	USE indices, &
220	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
221	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
222
223	USE interaction_droplets_ptq_mod, &
224	ONLY: interaction_droplets_ptq
225
226	USE kinds
227
228	USE land_surface_model_mod, &
229	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
230	skip_time_do_lsm
231
232	USE ls_forcing_mod, &
233	ONLY: ls_forcing_surf, ls_forcing_vert
234
235	USE nudge_mod, &
236	ONLY: calc_tnudge, nudge_ref
237
238	USE particle_attributes, &
239	ONLY: particle_advection, particle_advection_start, &
240	use_sgs_for_particles, wang_kernel
241
242	USE pegrid
243
244	USE pmc_interface, &
245	ONLY: client_to_server, nested_run, nesting_mode, &
246	pmci_ensure_nest_mass_conservation, pmci_client_datatrans, &
247	pmci_client_initialize, pmci_client_synchronize, &
248	pmci_server_datatrans, pmci_server_initialize, &
249	pmci_server_synchronize, pmci_update_new, server_to_client
250
251	USE production_e_mod, &
252	ONLY: production_e_init
253
254	USE progress_bar, &
255	ONLY: finish_progress_bar, output_progress_bar
256
257	USE prognostic_equations_mod, &
258	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
259	prognostic_equations_vector
260
261	USE radiation_model_mod, &
262	ONLY: dt_radiation, force_radiation_call, radiation, &
263	radiation_clearsky, radiation_rrtmg, radiation_scheme, &
264	skip_time_do_radiation, time_radiation
265
266	USE statistics, &
267	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
268
269	USE surface_layer_fluxes_mod, &
270	ONLY: surface_layer_fluxes
271
272	USE user_actions_mod, &
273	ONLY: user_actions
274
275	IMPLICIT NONE
276
277	CHARACTER (LEN=9) :: time_to_string !<
278
279	INTEGER(iwp) :: netcdf_data_format_save !<
280
281	!
282	!-- At the beginning of a simulation determine the time step as well as
283	!-- determine and print out the run control parameters
284	IF ( simulated_time == 0.0_wp ) CALL timestep
285
286	!
287	!-- Synchronize the timestep in case of nested run.
288	!-- The server side must be called first
289	IF ( nested_run ) THEN
290	CALL pmci_server_synchronize
291	CALL pmci_client_synchronize
292	ENDIF
293
294	CALL run_control
295
296	!
297	!-- Data exchange between coupled models in case that a call has been omitted
298	!-- at the end of the previous run of a job chain.
299	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
300	!
301	!-- In case of model termination initiated by the local model the coupler
302	!-- must not be called because this would again cause an MPI hang.
303	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
304	CALL surface_coupler
305	time_coupling = time_coupling - dt_coupling
306	ENDDO
307	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
308	THEN
309	time_coupling = time_since_reference_point
310	ENDIF
311	ENDIF
312
313	IF ( nested_run ) THEN
314	!
315	!-- TO_DO: try to give more meaningful comments here
316	!-- Domain nesting: From server to client commmunication
317	!-- ( direction=SERVER_TO_CLIENT )
318	!-- Nest initial conditions
319	!
320	!-- Send initial condition data from server to client
321	CALL pmci_server_initialize
322	!
323	!-- Receive and interpolate initial data on client
324	CALL pmci_client_initialize
325	!
326	!-- TO_DO, maybe removed
327	!-- Obs. Nesting may be unnecessary at this point.
328	!
329	!-- Nest boundary conditions
330	CALL pmci_server_datatrans( server_to_client )
331	CALL pmci_client_datatrans( server_to_client )
332
333	IF ( nesting_mode == 'two-way' ) THEN
334	CALL pmci_server_datatrans( client_to_server )
335	CALL pmci_client_datatrans( client_to_server )
336	!
337	!-- Exchange_horiz is needed for all server-domains after the anterpolation
338	CALL exchange_horiz( u, nbgp )
339	CALL exchange_horiz( v, nbgp )
340	CALL exchange_horiz( w, nbgp )
341	CALL exchange_horiz( pt, nbgp )
342	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
343	intermediate_timestep_count = 0
344	CALL pres
345	ENDIF
346	!
347	!-- Correct the w top-BC in nest domains to ensure mass conservation.
348	!-- Copy the interpolated/anterpolated boundary values to the _p
349	!-- arrays, too, to make sure the interpolated/anterpolated boundary
350	!-- values are carried over from one RK inner step to another.
351	!-- These actions must not be done for the root domain.
352	IF ( nest_domain ) THEN
353	CALL pmci_ensure_nest_mass_conservation
354	CALL pmci_update_new
355	ENDIF
356
357	ENDIF
358
359	#if defined( __dvrp_graphics )
360	!
361	!-- Time measurement with dvrp software
362	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
363	#endif
364
365	CALL location_message( 'start with time-stepping', .TRUE. )
366	!
367	!-- Start of the time loop
368	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
369	.NOT. terminate_run )
370
371	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
372
373	!
374	!-- Determine size of next time step
375	IF ( simulated_time /= 0.0_wp ) THEN
376	CALL timestep
377
378	IF ( nested_run ) THEN
379	!
380	!-- TO_DO: try to give more detailed and meaningful comments here
381	!-- Server side must be called first
382	CALL pmci_server_synchronize
383	CALL pmci_client_synchronize
384	ENDIF
385	ENDIF
386
387
388	!
389	!-- Determine ug, vg and w_subs in dependence on data from external file
390	!-- LSF_DATA
391	IF ( large_scale_forcing .AND. lsf_vert ) THEN
392	CALL ls_forcing_vert ( simulated_time )
393	sums_ls_l = 0.0_wp
394	ENDIF
395
396	!
397	!-- Set pt_init and q_init to the current profiles taken from
398	!-- NUDGING_DATA
399	IF ( nudging ) THEN
400	CALL nudge_ref ( simulated_time )
401	!
402	!-- Store temperature gradient at the top boundary for possible Neumann
403	!-- boundary condition
404	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
405	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
406	ENDIF
407
408	!
409	!-- Execute the user-defined actions
410	CALL user_actions( 'before_timestep' )
411
412	!
413	!-- Start of intermediate step loop
414	intermediate_timestep_count = 0
415	DO WHILE ( intermediate_timestep_count < &
416	intermediate_timestep_count_max )
417
418	intermediate_timestep_count = intermediate_timestep_count + 1
419
420	!
421	!-- Set the steering factors for the prognostic equations which depend
422	!-- on the timestep scheme
423	CALL timestep_scheme_steering
424
425	!
426	!-- Calculate those variables needed in the tendency terms which need
427	!-- global communication
428	IF ( .NOT. use_single_reference_value .AND. &
429	.NOT. use_initial_profile_as_reference ) THEN
430	!
431	!-- Horizontally averaged profiles to be used as reference state in
432	!-- buoyancy terms (WARNING: only the respective last call of
433	!-- calc_mean_profile defines the reference state!)
434	IF ( .NOT. neutral ) THEN
435	CALL calc_mean_profile( pt, 4 )
436	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
437	ENDIF
438	IF ( ocean ) THEN
439	CALL calc_mean_profile( rho, 64 )
440	ref_state(:) = hom(:,1,64,0)
441	ENDIF
442	IF ( humidity ) THEN
443	CALL calc_mean_profile( vpt, 44 )
444	ref_state(:) = hom(:,1,44,0)
445	ENDIF
446
447	ENDIF
448
449	IF ( .NOT. constant_diffusion ) CALL production_e_init
450	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
451	intermediate_timestep_count == 1 ) CALL ws_statistics
452	!
453	!-- In case of nudging calculate current nudging time scale and horizontal
454	!-- means of u, v, pt and q
455	IF ( nudging ) THEN
456	CALL calc_tnudge( simulated_time )
457	CALL calc_mean_profile( u, 1 )
458	CALL calc_mean_profile( v, 2 )
459	CALL calc_mean_profile( pt, 4 )
460	CALL calc_mean_profile( q, 41 )
461	ENDIF
462
463	!
464	!-- Solve the prognostic equations. A fast cache optimized version with
465	!-- only one single loop is used in case of Piascek-Williams advection
466	!-- scheme. NEC vector machines use a different version, because
467	!-- in the other versions a good vectorization is prohibited due to
468	!-- inlining problems.
469	IF ( loop_optimization == 'cache' ) THEN
470	CALL prognostic_equations_cache
471	ELSEIF ( loop_optimization == 'vector' ) THEN
472	CALL prognostic_equations_vector
473	ELSEIF ( loop_optimization == 'acc' ) THEN
474	i_left = nxl; i_right = nxr
475	j_south = nys; j_north = nyn
476	CALL prognostic_equations_acc
477
478	! i_left = nxl; i_right = nxl+nbgp-1
479	! j_south = nys; j_north = nyn
480	! CALL prognostic_equations_acc
481	! i_left = nxr-nbgp+1; i_right = nxr
482	! j_south = nys; j_north = nyn
483	! CALL prognostic_equations_acc
484
485	!
486	!-- Exchange of ghost points (lateral boundary conditions)
487	IF ( background_communication ) THEN
488
489	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
490
491	send_receive = 'lr'
492	sendrecv_in_background = .TRUE.
493	req = 0
494	req_count = 0
495
496	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
497	on_device = .TRUE. ! to be removed after complete porting
498	ELSE ! of ghost point exchange
499	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
500	ENDIF
501
502	CALL exchange_horiz( u_p, nbgp )
503	CALL exchange_horiz( v_p, nbgp )
504	CALL exchange_horiz( w_p, nbgp )
505	CALL exchange_horiz( pt_p, nbgp )
506	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
507	IF ( ocean ) THEN
508	CALL exchange_horiz( sa_p, nbgp )
509	CALL exchange_horiz( rho, nbgp )
510	CALL exchange_horiz( prho, nbgp )
511	ENDIF
512	IF (humidity .OR. passive_scalar) THEN
513	CALL exchange_horiz( q_p, nbgp )
514	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
515	CALL exchange_horiz( qr_p, nbgp )
516	CALL exchange_horiz( nr_p, nbgp )
517	ENDIF
518	ENDIF
519	IF ( cloud_droplets ) THEN
520	CALL exchange_horiz( ql, nbgp )
521	CALL exchange_horiz( ql_c, nbgp )
522	CALL exchange_horiz( ql_v, nbgp )
523	CALL exchange_horiz( ql_vp, nbgp )
524	ENDIF
525	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
526	THEN
527	CALL exchange_horiz( diss, nbgp )
528	ENDIF
529
530	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
531	on_device = .FALSE. ! to be removed after complete porting
532	ELSE ! of ghost point exchange
533	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
534	ENDIF
535
536	sendrecv_in_background = .FALSE.
537
538	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
539
540	ENDIF
541
542	! i_left = nxl+nbgp; i_right = nxr-nbgp
543	! j_south = nys; j_north = nys+nbgp-1
544	! CALL prognostic_equations_acc
545	! i_left = nxl+nbgp; i_right = nxr-nbgp
546	! j_south = nyn-nbgp+1; j_north = nyn
547	! CALL prognostic_equations_acc
548
549	IF ( background_communication ) THEN
550	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
551	#if defined( __parallel )
552	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
553	#endif
554	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
555
556	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
557
558	send_receive = 'ns'
559	sendrecv_in_background = .TRUE.
560	req = 0
561	req_count = 0
562
563	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
564	on_device = .TRUE. ! to be removed after complete porting
565	ELSE ! of ghost point exchange
566	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
567	ENDIF
568
569	CALL exchange_horiz( u_p, nbgp )
570	CALL exchange_horiz( v_p, nbgp )
571	CALL exchange_horiz( w_p, nbgp )
572	CALL exchange_horiz( pt_p, nbgp )
573	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
574	IF ( ocean ) THEN
575	CALL exchange_horiz( sa_p, nbgp )
576	CALL exchange_horiz( rho, nbgp )
577	CALL exchange_horiz( prho, nbgp )
578	ENDIF
579	IF (humidity .OR. passive_scalar) THEN
580	CALL exchange_horiz( q_p, nbgp )
581	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
582	CALL exchange_horiz( qr_p, nbgp )
583	CALL exchange_horiz( nr_p, nbgp )
584	ENDIF
585	ENDIF
586	IF ( cloud_droplets ) THEN
587	CALL exchange_horiz( ql, nbgp )
588	CALL exchange_horiz( ql_c, nbgp )
589	CALL exchange_horiz( ql_v, nbgp )
590	CALL exchange_horiz( ql_vp, nbgp )
591	ENDIF
592	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
593	THEN
594	CALL exchange_horiz( diss, nbgp )
595	ENDIF
596
597	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
598	on_device = .FALSE. ! to be removed after complete porting
599	ELSE ! of ghost point exchange
600	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
601	ENDIF
602
603	sendrecv_in_background = .FALSE.
604
605	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
606
607	ENDIF
608
609	! i_left = nxl+nbgp; i_right = nxr-nbgp
610	! j_south = nys+nbgp; j_north = nyn-nbgp
611	! CALL prognostic_equations_acc
612
613	IF ( background_communication ) THEN
614	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
615	#if defined( __parallel )
616	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
617	#endif
618	send_receive = 'al'
619	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
620	ENDIF
621
622	ENDIF
623
624	!
625	!-- Particle transport/physics with the Lagrangian particle model
626	!-- (only once during intermediate steps, because it uses an Euler-step)
627	!-- ### particle model should be moved before prognostic_equations, in order
628	!-- to regard droplet interactions directly
629	IF ( particle_advection .AND. &
630	simulated_time >= particle_advection_start .AND. &
631	intermediate_timestep_count == 1 ) THEN
632	CALL lpm
633	first_call_lpm = .FALSE.
634	ENDIF
635
636	!
637	!-- Interaction of droplets with temperature and specific humidity.
638	!-- Droplet condensation and evaporation is calculated within
639	!-- advec_particles.
640	IF ( cloud_droplets .AND. &
641	intermediate_timestep_count == intermediate_timestep_count_max )&
642	THEN
643	CALL interaction_droplets_ptq
644	ENDIF
645
646	!
647	!-- Exchange of ghost points (lateral boundary conditions)
648	IF ( .NOT. background_communication ) THEN
649
650	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
651
652	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
653	on_device = .TRUE. ! to be removed after complete porting
654	ELSE ! of ghost point exchange
655	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
656	ENDIF
657
658	CALL exchange_horiz( u_p, nbgp )
659	CALL exchange_horiz( v_p, nbgp )
660	CALL exchange_horiz( w_p, nbgp )
661	CALL exchange_horiz( pt_p, nbgp )
662	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
663	IF ( ocean ) THEN
664	CALL exchange_horiz( sa_p, nbgp )
665	CALL exchange_horiz( rho, nbgp )
666	CALL exchange_horiz( prho, nbgp )
667	ENDIF
668	IF (humidity .OR. passive_scalar) THEN
669	CALL exchange_horiz( q_p, nbgp )
670	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
671	precipitation ) THEN
672	CALL exchange_horiz( qr_p, nbgp )
673	CALL exchange_horiz( nr_p, nbgp )
674	ENDIF
675	ENDIF
676	IF ( cloud_droplets ) THEN
677	CALL exchange_horiz( ql, nbgp )
678	CALL exchange_horiz( ql_c, nbgp )
679	CALL exchange_horiz( ql_v, nbgp )
680	CALL exchange_horiz( ql_vp, nbgp )
681	ENDIF
682	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
683	THEN
684	CALL exchange_horiz( diss, nbgp )
685	ENDIF
686
687	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
688	on_device = .FALSE. ! to be removed after complete porting
689	ELSE ! of ghost point exchange
690	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
691	ENDIF
692
693	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
694
695	ENDIF
696
697	!
698	!-- Boundary conditions for the prognostic quantities (except of the
699	!-- velocities at the outflow in case of a non-cyclic lateral wall)
700	CALL boundary_conds
701
702	!
703	!-- Swap the time levels in preparation for the next time step.
704	CALL swap_timelevel
705
706	IF ( nested_run ) THEN
707	!
708	!-- TO_DO: try to give more meaningful comments here
709	!-- Domain nesting
710	!-- Note that the nesting operations are omitted intentionally on the
711	!-- first two RK-substeps.
712	CALL cpu_log( log_point(60), 'nesting', 'start' )
713	!
714	!-- From server to client commmunication ( direction=SERVER_TO_CLIENT )
715	CALL pmci_server_datatrans( server_to_client )
716	CALL pmci_client_datatrans( server_to_client )
717
718	IF ( nesting_mode == 'two-way' ) THEN
719	!
720	!-- From client to server commmunication ( direction=CLIENT_TO_SERVER )
721	CALL pmci_server_datatrans( client_to_server )
722	CALL pmci_client_datatrans( client_to_server )
723	!
724	!-- Exchange_horiz is needed for all server-domains after the
725	!-- anterpolation
726	CALL exchange_horiz( u, nbgp )
727	CALL exchange_horiz( v, nbgp )
728	CALL exchange_horiz( w, nbgp )
729	CALL exchange_horiz( pt, nbgp )
730	IF ( humidity .OR. passive_scalar ) THEN
731	CALL exchange_horiz( q, nbgp )
732	ENDIF
733	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
734	ENDIF
735	!
736	!-- Correct the w top-BC in nest domains to ensure mass conservation.
737	!-- This action must never be done for the root domain.
738	IF ( nest_domain ) THEN
739	CALL pmci_ensure_nest_mass_conservation
740	!
741	!-- pmc_update_new is not necessary if nesting is made at each
742	!-- substep
743	CALL pmci_update_new
744	ENDIF
745
746	CALL cpu_log( log_point(60), 'nesting', 'stop' )
747
748	ENDIF
749
750	!
751	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
752	!-- when a sloping surface is used
753	IF ( sloping_surface ) THEN
754	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
755	pt_slope_offset
756	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
757	pt_slope_offset
758	ENDIF
759
760	!
761	!-- Impose a turbulent inflow using the recycling method
762	IF ( turbulent_inflow ) CALL inflow_turbulence
763
764	!
765	!-- Impose a random perturbation on the horizontal velocity field
766	IF ( create_disturbances .AND. &
767	( call_psolver_at_all_substeps .AND. &
768	intermediate_timestep_count == intermediate_timestep_count_max )&
769	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
770	intermediate_timestep_count == 1 ) ) &
771	THEN
772	time_disturb = time_disturb + dt_3d
773	IF ( time_disturb >= dt_disturb ) THEN
774	!$acc update host( u, v )
775	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
776	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
777	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
778	CALL disturb_field( nzb_u_inner, tend, u )
779	CALL disturb_field( nzb_v_inner, tend, v )
780	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
781	!
782	!-- Runs with a non-cyclic lateral wall need perturbations
783	!-- near the inflow throughout the whole simulation
784	dist_range = 1
785	CALL disturb_field( nzb_u_inner, tend, u )
786	CALL disturb_field( nzb_v_inner, tend, v )
787	dist_range = 0
788	ENDIF
789	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
790	!$acc update device( u, v )
791	time_disturb = time_disturb - dt_disturb
792	ENDIF
793	ENDIF
794
795	!
796	!-- Reduce the velocity divergence via the equation for perturbation
797	!-- pressure.
798	IF ( intermediate_timestep_count == 1 .OR. &
799	call_psolver_at_all_substeps ) THEN
800	CALL pres
801	ENDIF
802
803	!
804	!-- If required, compute liquid water content
805	IF ( cloud_physics ) THEN
806	CALL calc_liquid_water_content
807	!$acc update device( ql )
808	ENDIF
809	!
810	!-- If required, compute virtual potential temperature
811	IF ( humidity ) THEN
812	CALL compute_vpt
813	!$acc update device( vpt )
814	ENDIF
815
816	!
817	!-- Compute the diffusion quantities
818	IF ( .NOT. constant_diffusion ) THEN
819
820	!
821	!-- Determine surface fluxes shf and qsws and surface values
822	!-- pt_surface and q_surface in dependence on data from external
823	!-- file LSF_DATA respectively
824	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
825	intermediate_timestep_count == intermediate_timestep_count_max )&
826	THEN
827	CALL ls_forcing_surf ( simulated_time )
828	ENDIF
829
830	!
831	!-- First the vertical fluxes in the surface (constant flux) layer are computed
832	IF ( constant_flux_layer ) THEN
833	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
834	CALL surface_layer_fluxes
835	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
836	ENDIF
837
838	!
839	!-- If required, solve the energy balance for the surface and run soil
840	!-- model
841	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
842
843	CALL cpu_log( log_point(54), 'land_surface', 'start' )
844	CALL lsm_energy_balance
845	CALL lsm_soil_model
846	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
847	ENDIF
848	!
849	!-- Compute the diffusion coefficients
850	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
851	IF ( .NOT. humidity ) THEN
852	IF ( ocean ) THEN
853	CALL diffusivities( prho, prho_reference )
854	ELSE
855	CALL diffusivities( pt, pt_reference )
856	ENDIF
857	ELSE
858	CALL diffusivities( vpt, pt_reference )
859	ENDIF
860	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
861
862	ENDIF
863
864	!
865	!-- If required, calculate radiative fluxes and heating rates
866	IF ( radiation .AND. intermediate_timestep_count &
867	== intermediate_timestep_count_max .AND. simulated_time > &
868	skip_time_do_radiation ) THEN
869
870	time_radiation = time_radiation + dt_3d
871
872	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
873	THEN
874
875	CALL cpu_log( log_point(50), 'radiation', 'start' )
876
877	IF ( .NOT. force_radiation_call ) THEN
878	time_radiation = time_radiation - dt_radiation
879	ELSE
880	WRITE(9,*) "Unscheduled radiation call at ", simulated_time
881	CALL LOCAL_FLUSH ( 9 )
882	ENDIF
883
884	IF ( radiation_scheme == 'clear-sky' ) THEN
885	CALL radiation_clearsky
886	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
887	CALL radiation_rrtmg
888	ENDIF
889
890	CALL cpu_log( log_point(50), 'radiation', 'stop' )
891	ENDIF
892	ENDIF
893
894	ENDDO ! Intermediate step loop
895
896	!
897	!-- Increase simulation time and output times
898	nr_timesteps_this_run = nr_timesteps_this_run + 1
899	current_timestep_number = current_timestep_number + 1
900	simulated_time = simulated_time + dt_3d
901	simulated_time_chr = time_to_string( simulated_time )
902	time_since_reference_point = simulated_time - coupling_start_time
903
904	IF ( simulated_time >= skip_time_data_output_av ) THEN
905	time_do_av = time_do_av + dt_3d
906	ENDIF
907	IF ( simulated_time >= skip_time_do2d_xy ) THEN
908	time_do2d_xy = time_do2d_xy + dt_3d
909	ENDIF
910	IF ( simulated_time >= skip_time_do2d_xz ) THEN
911	time_do2d_xz = time_do2d_xz + dt_3d
912	ENDIF
913	IF ( simulated_time >= skip_time_do2d_yz ) THEN
914	time_do2d_yz = time_do2d_yz + dt_3d
915	ENDIF
916	IF ( simulated_time >= skip_time_do3d ) THEN
917	time_do3d = time_do3d + dt_3d
918	ENDIF
919	DO mid = 1, masks
920	IF ( simulated_time >= skip_time_domask(mid) ) THEN
921	time_domask(mid)= time_domask(mid) + dt_3d
922	ENDIF
923	ENDDO
924	time_dvrp = time_dvrp + dt_3d
925	IF ( simulated_time >= skip_time_dosp ) THEN
926	time_dosp = time_dosp + dt_3d
927	ENDIF
928	time_dots = time_dots + dt_3d
929	IF ( .NOT. first_call_lpm ) THEN
930	time_dopts = time_dopts + dt_3d
931	ENDIF
932	IF ( simulated_time >= skip_time_dopr ) THEN
933	time_dopr = time_dopr + dt_3d
934	ENDIF
935	time_dopr_listing = time_dopr_listing + dt_3d
936	time_run_control = time_run_control + dt_3d
937
938	!
939	!-- Data exchange between coupled models
940	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
941	time_coupling = time_coupling + dt_3d
942
943	!
944	!-- In case of model termination initiated by the local model
945	!-- (terminate_coupled > 0), the coupler must be skipped because it would
946	!-- cause an MPI intercomminucation hang.
947	!-- If necessary, the coupler will be called at the beginning of the
948	!-- next restart run.
949	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
950	CALL surface_coupler
951	time_coupling = time_coupling - dt_coupling
952	ENDDO
953	ENDIF
954
955	!
956	!-- Execute user-defined actions
957	CALL user_actions( 'after_integration' )
958
959	!
960	!-- If Galilei transformation is used, determine the distance that the
961	!-- model has moved so far
962	IF ( galilei_transformation ) THEN
963	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
964	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
965	ENDIF
966
967	!
968	!-- Check, if restart is necessary (because cpu-time is expiring or
969	!-- because it is forced by user) and set stop flag
970	!-- This call is skipped if the remote model has already initiated a restart.
971	IF ( .NOT. terminate_run ) CALL check_for_restart
972
973	!
974	!-- Carry out statistical analysis and output at the requested output times.
975	!-- The MOD function is used for calculating the output time counters (like
976	!-- time_dopr) in order to regard a possible decrease of the output time
977	!-- interval in case of restart runs
978
979	!
980	!-- Set a flag indicating that so far no statistics have been created
981	!-- for this time step
982	flow_statistics_called = .FALSE.
983
984	!
985	!-- If required, call flow_statistics for averaging in time
986	IF ( averaging_interval_pr /= 0.0_wp .AND. &
987	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
988	simulated_time >= skip_time_dopr ) THEN
989	time_dopr_av = time_dopr_av + dt_3d
990	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
991	do_sum = .TRUE.
992	time_dopr_av = MOD( time_dopr_av, &
993	MAX( dt_averaging_input_pr, dt_3d ) )
994	ENDIF
995	ENDIF
996	IF ( do_sum ) CALL flow_statistics
997
998	!
999	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1000	IF ( averaging_interval /= 0.0_wp .AND. &
1001	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1002	simulated_time >= skip_time_data_output_av ) &
1003	THEN
1004	time_do_sla = time_do_sla + dt_3d
1005	IF ( time_do_sla >= dt_averaging_input ) THEN
1006	CALL sum_up_3d_data
1007	average_count_3d = average_count_3d + 1
1008	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1009	ENDIF
1010	ENDIF
1011
1012	!
1013	!-- Calculate spectra for time averaging
1014	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1015	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1016	simulated_time >= skip_time_dosp ) THEN
1017	time_dosp_av = time_dosp_av + dt_3d
1018	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1019	CALL calc_spectra
1020	time_dosp_av = MOD( time_dosp_av, &
1021	MAX( dt_averaging_input_pr, dt_3d ) )
1022	ENDIF
1023	ENDIF
1024
1025	!
1026	!-- Computation and output of run control parameters.
1027	!-- This is also done whenever perturbations have been imposed
1028	IF ( time_run_control >= dt_run_control .OR. &
1029	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1030	THEN
1031	CALL run_control
1032	IF ( time_run_control >= dt_run_control ) THEN
1033	time_run_control = MOD( time_run_control, &
1034	MAX( dt_run_control, dt_3d ) )
1035	ENDIF
1036	ENDIF
1037
1038	!
1039	!-- Profile output (ASCII) on file
1040	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1041	CALL print_1d
1042	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1043	dt_3d ) )
1044	ENDIF
1045
1046	!
1047	!-- Graphic output for PROFIL
1048	IF ( time_dopr >= dt_dopr ) THEN
1049	IF ( dopr_n /= 0 ) CALL data_output_profiles
1050	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1051	time_dopr_av = 0.0_wp ! due to averaging (see above)
1052	ENDIF
1053
1054	!
1055	!-- Graphic output for time series
1056	IF ( time_dots >= dt_dots ) THEN
1057	CALL data_output_tseries
1058	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1059	ENDIF
1060
1061	!
1062	!-- Output of spectra (formatted for use with PROFIL), in case of no
1063	!-- time averaging, spectra has to be calculated before
1064	IF ( time_dosp >= dt_dosp ) THEN
1065	IF ( average_count_sp == 0 ) CALL calc_spectra
1066	CALL data_output_spectra
1067	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1068	ENDIF
1069
1070	!
1071	!-- 2d-data output (cross-sections)
1072	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1073	CALL data_output_2d( 'xy', 0 )
1074	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1075	ENDIF
1076	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1077	CALL data_output_2d( 'xz', 0 )
1078	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1079	ENDIF
1080	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1081	CALL data_output_2d( 'yz', 0 )
1082	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1083	ENDIF
1084
1085	!
1086	!-- 3d-data output (volume data)
1087	IF ( time_do3d >= dt_do3d ) THEN
1088	CALL data_output_3d( 0 )
1089	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1090	ENDIF
1091
1092	!
1093	!-- masked data output
1094	!-- Parallel netcdf output is not tested so far for masked data, hence
1095	!-- netcdf_data_format is switched back to non-paralell output.
1096	netcdf_data_format_save = netcdf_data_format
1097	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1098	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1099	DO mid = 1, masks
1100	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1101	CALL data_output_mask( 0 )
1102	time_domask(mid) = MOD( time_domask(mid), &
1103	MAX( dt_domask(mid), dt_3d ) )
1104	ENDIF
1105	ENDDO
1106	netcdf_data_format = netcdf_data_format_save
1107
1108	!
1109	!-- Output of time-averaged 2d/3d/masked data
1110	IF ( time_do_av >= dt_data_output_av ) THEN
1111	CALL average_3d_data
1112	CALL data_output_2d( 'xy', 1 )
1113	CALL data_output_2d( 'xz', 1 )
1114	CALL data_output_2d( 'yz', 1 )
1115	CALL data_output_3d( 1 )
1116	!-- Parallel netcdf output is not tested so far for masked data, hence
1117	!-- netcdf_data_format is switched back to non-paralell output.
1118	netcdf_data_format_save = netcdf_data_format
1119	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1120	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1121	DO mid = 1, masks
1122	CALL data_output_mask( 1 )
1123	ENDDO
1124	netcdf_data_format = netcdf_data_format_save
1125	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1126	ENDIF
1127
1128	!
1129	!-- Output of particle time series
1130	IF ( particle_advection ) THEN
1131	IF ( time_dopts >= dt_dopts .OR. &
1132	( simulated_time >= particle_advection_start .AND. &
1133	first_call_lpm ) ) THEN
1134	CALL data_output_ptseries
1135	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1136	ENDIF
1137	ENDIF
1138
1139	!
1140	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1141	#if defined( __dvrp_graphics )
1142	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1143	#endif
1144	IF ( time_dvrp >= dt_dvrp ) THEN
1145	CALL data_output_dvrp
1146	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1147	ENDIF
1148	#if defined( __dvrp_graphics )
1149	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1150	#endif
1151
1152	!
1153	!-- If required, set the heat flux for the next time step at a random value
1154	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1155
1156	!
1157	!-- Execute user-defined actions
1158	CALL user_actions( 'after_timestep' )
1159
1160	!
1161	!-- Output elapsed simulated time in form of a progress bar on stdout
1162	IF ( myid == 0 ) CALL output_progress_bar
1163
1164	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1165
1166
1167	ENDDO ! time loop
1168
1169	IF ( myid == 0 ) CALL finish_progress_bar
1170
1171	#if defined( __dvrp_graphics )
1172	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1173	#endif
1174
1175	CALL location_message( 'finished time-stepping', .TRUE. )
1176
1177	END SUBROUTINE time_integration

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