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source: palm/trunk/SOURCE/time_integration.f90 @ 1977

Last change on this file since 1977 was 1977, checked in by maronga, 8 years ago
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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 1997-2016 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: time_integration.f90 1977 2016-07-27 13:28:18Z maronga $
26	!
27	! 1976 2016-07-27 13:28:04Z maronga
28	! Simplified calls to radiation model
29	!
30	! 1960 2016-07-12 16:34:24Z suehring
31	! Separate humidity and passive scalar
32	!
33	! 1957 2016-07-07 10:43:48Z suehring
34	! flight module added
35	!
36	! 1919 2016-05-27 14:51:23Z raasch
37	! Initial version of purely vertical nesting introduced.
38	!
39	! 1918 2016-05-27 14:35:57Z raasch
40	! determination of time step moved to the end of the time step loop,
41	! the first time step is now always calculated before the time step loop (i.e.
42	! also in case of restart runs)
43	!
44	! 1914 2016-05-26 14:44:07Z witha
45	! Added call for wind turbine model
46	!
47	! 1878 2016-04-19 12:30:36Z hellstea
48	! Synchronization for nested runs rewritten
49	!
50	! 1853 2016-04-11 09:00:35Z maronga
51	! Adjusted for use with radiation_scheme = constant
52	!
53	! 1849 2016-04-08 11:33:18Z hoffmann
54	! Adapted for modularization of microphysics
55	!
56	! 1833 2016-04-07 14:23:03Z raasch
57	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
58	!
59	! 1831 2016-04-07 13:15:51Z hoffmann
60	! turbulence renamed collision_turbulence
61	!
62	! 1822 2016-04-07 07:49:42Z hoffmann
63	! icloud_scheme replaced by microphysics_*
64	!
65	! 1808 2016-04-05 19:44:00Z raasch
66	! output message in case unscheduled radiation calls removed
67	!
68	! 1797 2016-03-21 16:50:28Z raasch
69	! introduction of different datatransfer modes
70	!
71	! 1791 2016-03-11 10:41:25Z raasch
72	! call of pmci_update_new removed
73	!
74	! 1786 2016-03-08 05:49:27Z raasch
75	! +module spectrum
76	!
77	! 1783 2016-03-06 18:36:17Z raasch
78	! switch back of netcdf data format for mask output moved to the mask output
79	! routine
80	!
81	! 1781 2016-03-03 15:12:23Z raasch
82	! some pmc calls removed at the beginning (before timeloop),
83	! pmc initialization moved to the main program
84	!
85	! 1764 2016-02-28 12:45:19Z raasch
86	! PMC_ACTIVE flags removed,
87	! bugfix: nest synchronization after first call of timestep
88	!
89	! 1762 2016-02-25 12:31:13Z hellstea
90	! Introduction of nested domain feature
91	!
92	! 1736 2015-12-04 08:56:33Z raasch
93	! no perturbations added to total domain if energy limit has been set zero
94	!
95	! 1691 2015-10-26 16:17:44Z maronga
96	! Added option for spin-ups without land surface and radiation models. Moved calls
97	! for radiation and lan surface schemes.
98	!
99	! 1682 2015-10-07 23:56:08Z knoop
100	! Code annotations made doxygen readable
101	!
102	! 1671 2015-09-25 03:29:37Z raasch
103	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
104	! for particles
105	!
106	! 1585 2015-04-30 07:05:52Z maronga
107	! Moved call of radiation scheme. Added support for RRTM
108	!
109	! 1551 2015-03-03 14:18:16Z maronga
110	! Added interface for different radiation schemes.
111	!
112	! 1496 2014-12-02 17:25:50Z maronga
113	! Added calls for the land surface model and radiation scheme
114	!
115	! 1402 2014-05-09 14:25:13Z raasch
116	! location messages modified
117	!
118	! 1384 2014-05-02 14:31:06Z raasch
119	! location messages added
120	!
121	! 1380 2014-04-28 12:40:45Z heinze
122	! CALL of nudge_ref added
123	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
124	!
125	! 1365 2014-04-22 15:03:56Z boeske
126	! Reset sums_ls_l to zero at each timestep
127	! +sums_ls_l
128	! Calculation of reference state (previously in subroutine calc_mean_profile)
129
130	! 1342 2014-03-26 17:04:47Z kanani
131	! REAL constants defined as wp-kind
132	!
133	! 1320 2014-03-20 08:40:49Z raasch
134	! ONLY-attribute added to USE-statements,
135	! kind-parameters added to all INTEGER and REAL declaration statements,
136	! kinds are defined in new module kinds,
137	! old module precision_kind is removed,
138	! revision history before 2012 removed,
139	! comment fields (!:) to be used for variable explanations added to
140	! all variable declaration statements
141	! 1318 2014-03-17 13:35:16Z raasch
142	! module interfaces removed
143	!
144	! 1308 2014-03-13 14:58:42Z fricke
145	! +netcdf_data_format_save
146	! For masked data, parallel netcdf output is not tested so far, hence
147	! netcdf_data_format is switched back to non-paralell output.
148	!
149	! 1276 2014-01-15 13:40:41Z heinze
150	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
151	!
152	! 1257 2013-11-08 15:18:40Z raasch
153	! acc-update-host directive for timestep removed
154	!
155	! 1241 2013-10-30 11:36:58Z heinze
156	! Generalize calc_mean_profile for wider use
157	! Determine shf and qsws in dependence on data from LSF_DATA
158	! Determine ug and vg in dependence on data from LSF_DATA
159	! 1221 2013-09-10 08:59:13Z raasch
160	! host update of arrays before timestep is called
161	!
162	! 1179 2013-06-14 05:57:58Z raasch
163	! mean profiles for reference state are only calculated if required,
164	! small bugfix for background communication
165	!
166	! 1171 2013-05-30 11:27:45Z raasch
167	! split of prognostic_equations deactivated (comment lines), for the time being
168	!
169	! 1128 2013-04-12 06:19:32Z raasch
170	! asynchronous transfer of ghost point data realized for acc-optimized version:
171	! prognostic_equations are first called two times for those points required for
172	! the left-right and north-south exchange, respectively, and then for the
173	! remaining points,
174	! those parts requiring global communication moved from prognostic_equations to
175	! here
176	!
177	! 1115 2013-03-26 18:16:16Z hoffmann
178	! calculation of qr and nr is restricted to precipitation
179	!
180	! 1113 2013-03-10 02:48:14Z raasch
181	! GPU-porting of boundary conditions,
182	! openACC directives updated
183	! formal parameter removed from routine boundary_conds
184	!
185	! 1111 2013-03-08 23:54:10Z raasch
186	! +internal timestep counter for cpu statistics added,
187	! openACC directives updated
188	!
189	! 1092 2013-02-02 11:24:22Z raasch
190	! unused variables removed
191	!
192	! 1065 2012-11-22 17:42:36Z hoffmann
193	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
194	!
195	! 1053 2012-11-13 17:11:03Z hoffmann
196	! exchange of ghost points for nr, qr added
197	!
198	! 1036 2012-10-22 13:43:42Z raasch
199	! code put under GPL (PALM 3.9)
200	!
201	! 1019 2012-09-28 06:46:45Z raasch
202	! non-optimized version of prognostic_equations removed
203	!
204	! 1015 2012-09-27 09:23:24Z raasch
205	! +call of prognostic_equations_acc
206	!
207	! 1001 2012-09-13 14:08:46Z raasch
208	! all actions concerning leapfrog- and upstream-spline-scheme removed
209	!
210	! 849 2012-03-15 10:35:09Z raasch
211	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
212	!
213	! 825 2012-02-19 03:03:44Z raasch
214	! wang_collision_kernel renamed wang_kernel
215	!
216	! Revision 1.1 1997/08/11 06:19:04 raasch
217	! Initial revision
218	!
219	!
220	! Description:
221	! ------------
222	!> Integration in time of the model equations, statistical analysis and graphic
223	!> output
224	!------------------------------------------------------------------------------!
225	SUBROUTINE time_integration
226
227
228	USE advec_ws, &
229	ONLY: ws_statistics
230
231	USE arrays_3d, &
232	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
233	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, s, s_p, sa_p, &
234	tend, u, u_p, v, vpt, v_p, w, w_p
235
236	USE calc_mean_profile_mod, &
237	ONLY: calc_mean_profile
238
239	USE control_parameters, &
240	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
241	averaging_interval, averaging_interval_pr, &
242	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
243	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
244	cloud_physics, constant_flux_layer, constant_heatflux, &
245	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
246	coupling_start_time, current_timestep_number, &
247	disturbance_created, disturbance_energy_limit, dist_range, &
248	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
249	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
250	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
251	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
252	end_time, first_call_lpm, galilei_transformation, humidity, &
253	intermediate_timestep_count, &
254	intermediate_timestep_count_max, large_scale_forcing, &
255	loop_optimization, lsf_surf, lsf_vert, masks, &
256	microphysics_seifert, mid, nest_domain, &
257	neutral, nr_timesteps_this_run, nudging, &
258	ocean, on_device, passive_scalar, &
259	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
260	run_coupled, simulated_time, simulated_time_chr, &
261	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
262	skip_time_do3d, skip_time_domask, skip_time_dopr, &
263	skip_time_data_output_av, sloping_surface, &
264	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
265	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
266	time_do3d, time_domask, time_dopr, time_dopr_av, &
267	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
268	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
269	time_run_control, time_since_reference_point, &
270	turbulent_inflow, use_initial_profile_as_reference, &
271	use_single_reference_value, u_gtrans, v_gtrans, virtual_flight, &
272	ws_scheme_mom, ws_scheme_sca
273
274	USE cpulog, &
275	ONLY: cpu_log, log_point, log_point_s
276
277	USE flight_mod, &
278	ONLY: flight_measurement
279
280
281	USE indices, &
282	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
283	nxrg, nyn, nyng, nys, nysg, nzb, nzt, nzb_u_inner, nzb_v_inner
284
285	USE interaction_droplets_ptq_mod, &
286	ONLY: interaction_droplets_ptq
287
288	USE interfaces
289
290	USE kinds
291
292	USE land_surface_model_mod, &
293	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
294	skip_time_do_lsm
295
296	USE ls_forcing_mod, &
297	ONLY: ls_forcing_surf, ls_forcing_vert
298
299	USE microphysics_mod, &
300	ONLY: collision_turbulence
301
302	USE nudge_mod, &
303	ONLY: calc_tnudge, nudge_ref
304
305	USE particle_attributes, &
306	ONLY: particle_advection, particle_advection_start, &
307	use_sgs_for_particles, wang_kernel
308
309	USE pegrid
310
311	USE pmc_interface, &
312	ONLY: nested_run, nesting_mode, pmci_datatrans, &
313	pmci_ensure_nest_mass_conservation, pmci_synchronize
314
315	USE production_e_mod, &
316	ONLY: production_e_init
317
318	USE progress_bar, &
319	ONLY: finish_progress_bar, output_progress_bar
320
321	USE prognostic_equations_mod, &
322	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
323	prognostic_equations_vector
324
325	USE radiation_model_mod, &
326	ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
327	skip_time_do_radiation, time_radiation
328
329	USE spectra_mod, &
330	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
331	skip_time_dosp
332
333	USE statistics, &
334	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l, u_max, &
335	u_max_ijk, v_max, v_max_ijk, w_max, w_max_ijk
336
337	USE surface_layer_fluxes_mod, &
338	ONLY: surface_layer_fluxes
339
340	USE user_actions_mod, &
341	ONLY: user_actions
342
343	USE wind_turbine_model_mod, &
344	ONLY: wind_turbine, wtm_forces
345
346	IMPLICIT NONE
347
348	CHARACTER (LEN=9) :: time_to_string !<
349
350	REAL(wp) :: dt_3d_old !< temporary storage of timestep to be used for
351	!< steering of run control output interval
352
353	!
354	!-- At beginning determine the first time step
355	CALL timestep
356
357	!
358	!-- Synchronize the timestep in case of nested run.
359	IF ( nested_run ) THEN
360	!
361	!-- Synchronization by unifying the time step.
362	!-- Global minimum of all time-steps is used for all.
363	CALL pmci_synchronize
364	ENDIF
365
366	!
367	!-- Determine and print out the run control quantities before the first time
368	!-- step of this run. For the initial run, some statistics (e.g. divergence)
369	!-- need to be determined first.
370	IF ( simulated_time == 0.0_wp ) CALL flow_statistics
371	CALL run_control
372
373	!
374	!-- Data exchange between coupled models in case that a call has been omitted
375	!-- at the end of the previous run of a job chain.
376	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
377	!
378	!-- In case of model termination initiated by the local model the coupler
379	!-- must not be called because this would again cause an MPI hang.
380	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
381	CALL surface_coupler
382	time_coupling = time_coupling - dt_coupling
383	ENDDO
384	IF (time_coupling == 0.0_wp .AND. &
385	time_since_reference_point < dt_coupling ) &
386	THEN
387	time_coupling = time_since_reference_point
388	ENDIF
389	ENDIF
390
391	#if defined( __dvrp_graphics )
392	!
393	!-- Time measurement with dvrp software
394	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
395	#endif
396
397	CALL location_message( 'start with time-stepping', .TRUE. )
398	!
399	!-- Start of the time loop
400	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
401	.NOT. terminate_run )
402
403	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
404
405	!
406	!-- Determine ug, vg and w_subs in dependence on data from external file
407	!-- LSF_DATA
408	IF ( large_scale_forcing .AND. lsf_vert ) THEN
409	CALL ls_forcing_vert ( simulated_time )
410	sums_ls_l = 0.0_wp
411	ENDIF
412
413	!
414	!-- Set pt_init and q_init to the current profiles taken from
415	!-- NUDGING_DATA
416	IF ( nudging ) THEN
417	CALL nudge_ref ( simulated_time )
418	!
419	!-- Store temperature gradient at the top boundary for possible Neumann
420	!-- boundary condition
421	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
422	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
423	ENDIF
424
425	!
426	!-- Execute the user-defined actions
427	CALL user_actions( 'before_timestep' )
428
429	!
430	!-- Calculate forces by wind turbines
431	IF ( wind_turbine ) THEN
432
433	CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
434
435	CALL wtm_forces
436
437	CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
438
439	ENDIF
440
441	!
442	!-- Start of intermediate step loop
443	intermediate_timestep_count = 0
444	DO WHILE ( intermediate_timestep_count < &
445	intermediate_timestep_count_max )
446
447	intermediate_timestep_count = intermediate_timestep_count + 1
448
449	!
450	!-- Set the steering factors for the prognostic equations which depend
451	!-- on the timestep scheme
452	CALL timestep_scheme_steering
453
454	!
455	!-- Calculate those variables needed in the tendency terms which need
456	!-- global communication
457	IF ( .NOT. use_single_reference_value .AND. &
458	.NOT. use_initial_profile_as_reference ) THEN
459	!
460	!-- Horizontally averaged profiles to be used as reference state in
461	!-- buoyancy terms (WARNING: only the respective last call of
462	!-- calc_mean_profile defines the reference state!)
463	IF ( .NOT. neutral ) THEN
464	CALL calc_mean_profile( pt, 4 )
465	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
466	ENDIF
467	IF ( ocean ) THEN
468	CALL calc_mean_profile( rho, 64 )
469	ref_state(:) = hom(:,1,64,0)
470	ENDIF
471	IF ( humidity ) THEN
472	CALL calc_mean_profile( vpt, 44 )
473	ref_state(:) = hom(:,1,44,0)
474	ENDIF
475
476	ENDIF
477
478	IF ( .NOT. constant_diffusion ) CALL production_e_init
479	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
480	intermediate_timestep_count == 1 ) CALL ws_statistics
481	!
482	!-- In case of nudging calculate current nudging time scale and horizontal
483	!-- means of u, v, pt and q
484	IF ( nudging ) THEN
485	CALL calc_tnudge( simulated_time )
486	CALL calc_mean_profile( u, 1 )
487	CALL calc_mean_profile( v, 2 )
488	CALL calc_mean_profile( pt, 4 )
489	CALL calc_mean_profile( q, 41 )
490	ENDIF
491
492	!
493	!-- Solve the prognostic equations. A fast cache optimized version with
494	!-- only one single loop is used in case of Piascek-Williams advection
495	!-- scheme. NEC vector machines use a different version, because
496	!-- in the other versions a good vectorization is prohibited due to
497	!-- inlining problems.
498	IF ( loop_optimization == 'cache' ) THEN
499	CALL prognostic_equations_cache
500	ELSEIF ( loop_optimization == 'vector' ) THEN
501	CALL prognostic_equations_vector
502	ELSEIF ( loop_optimization == 'acc' ) THEN
503	i_left = nxl; i_right = nxr
504	j_south = nys; j_north = nyn
505	CALL prognostic_equations_acc
506
507	! i_left = nxl; i_right = nxl+nbgp-1
508	! j_south = nys; j_north = nyn
509	! CALL prognostic_equations_acc
510	! i_left = nxr-nbgp+1; i_right = nxr
511	! j_south = nys; j_north = nyn
512	! CALL prognostic_equations_acc
513
514	!
515	!-- Exchange of ghost points (lateral boundary conditions)
516	IF ( background_communication ) THEN
517
518	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
519
520	send_receive = 'lr'
521	sendrecv_in_background = .TRUE.
522	req = 0
523	req_count = 0
524
525	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
526	on_device = .TRUE. ! to be removed after complete porting
527	ELSE ! of ghost point exchange
528	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
529	ENDIF
530
531	CALL exchange_horiz( u_p, nbgp )
532	CALL exchange_horiz( v_p, nbgp )
533	CALL exchange_horiz( w_p, nbgp )
534	CALL exchange_horiz( pt_p, nbgp )
535	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
536	IF ( ocean ) THEN
537	CALL exchange_horiz( sa_p, nbgp )
538	CALL exchange_horiz( rho, nbgp )
539	CALL exchange_horiz( prho, nbgp )
540	ENDIF
541	IF ( humidity ) THEN
542	CALL exchange_horiz( q_p, nbgp )
543	IF ( cloud_physics .AND. microphysics_seifert ) THEN
544	CALL exchange_horiz( qr_p, nbgp )
545	CALL exchange_horiz( nr_p, nbgp )
546	ENDIF
547	ENDIF
548	IF ( cloud_droplets ) THEN
549	CALL exchange_horiz( ql, nbgp )
550	CALL exchange_horiz( ql_c, nbgp )
551	CALL exchange_horiz( ql_v, nbgp )
552	CALL exchange_horiz( ql_vp, nbgp )
553	ENDIF
554	IF ( wang_kernel .OR. collision_turbulence .OR. &
555	use_sgs_for_particles ) THEN
556	CALL exchange_horiz( diss, nbgp )
557	ENDIF
558	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
559
560	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
561	on_device = .FALSE. ! to be removed after complete porting
562	ELSE ! of ghost point exchange
563	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
564	ENDIF
565
566	sendrecv_in_background = .FALSE.
567
568	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
569
570	ENDIF
571
572	! i_left = nxl+nbgp; i_right = nxr-nbgp
573	! j_south = nys; j_north = nys+nbgp-1
574	! CALL prognostic_equations_acc
575	! i_left = nxl+nbgp; i_right = nxr-nbgp
576	! j_south = nyn-nbgp+1; j_north = nyn
577	! CALL prognostic_equations_acc
578
579	IF ( background_communication ) THEN
580	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
581	#if defined( __parallel )
582	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
583	#endif
584	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
585
586	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
587
588	send_receive = 'ns'
589	sendrecv_in_background = .TRUE.
590	req = 0
591	req_count = 0
592
593	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
594	on_device = .TRUE. ! to be removed after complete porting
595	ELSE ! of ghost point exchange
596	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
597	ENDIF
598
599	CALL exchange_horiz( u_p, nbgp )
600	CALL exchange_horiz( v_p, nbgp )
601	CALL exchange_horiz( w_p, nbgp )
602	CALL exchange_horiz( pt_p, nbgp )
603	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
604	IF ( ocean ) THEN
605	CALL exchange_horiz( sa_p, nbgp )
606	CALL exchange_horiz( rho, nbgp )
607	CALL exchange_horiz( prho, nbgp )
608	ENDIF
609	IF ( humidity ) THEN
610	CALL exchange_horiz( q_p, nbgp )
611	IF ( cloud_physics .AND. microphysics_seifert ) THEN
612	CALL exchange_horiz( qr_p, nbgp )
613	CALL exchange_horiz( nr_p, nbgp )
614	ENDIF
615	ENDIF
616	IF ( cloud_droplets ) THEN
617	CALL exchange_horiz( ql, nbgp )
618	CALL exchange_horiz( ql_c, nbgp )
619	CALL exchange_horiz( ql_v, nbgp )
620	CALL exchange_horiz( ql_vp, nbgp )
621	ENDIF
622	IF ( wang_kernel .OR. collision_turbulence .OR. &
623	use_sgs_for_particles ) THEN
624	CALL exchange_horiz( diss, nbgp )
625	ENDIF
626	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
627
628	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
629	on_device = .FALSE. ! to be removed after complete porting
630	ELSE ! of ghost point exchange
631	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
632	ENDIF
633
634	sendrecv_in_background = .FALSE.
635
636	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
637
638	ENDIF
639
640	! i_left = nxl+nbgp; i_right = nxr-nbgp
641	! j_south = nys+nbgp; j_north = nyn-nbgp
642	! CALL prognostic_equations_acc
643
644	IF ( background_communication ) THEN
645	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
646	#if defined( __parallel )
647	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
648	#endif
649	send_receive = 'al'
650	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
651	ENDIF
652
653	ENDIF
654
655	!
656	!-- Particle transport/physics with the Lagrangian particle model
657	!-- (only once during intermediate steps, because it uses an Euler-step)
658	!-- ### particle model should be moved before prognostic_equations, in order
659	!-- to regard droplet interactions directly
660	IF ( particle_advection .AND. &
661	simulated_time >= particle_advection_start .AND. &
662	intermediate_timestep_count == 1 ) THEN
663	CALL lpm
664	first_call_lpm = .FALSE.
665	ENDIF
666
667	!
668	!-- Interaction of droplets with temperature and specific humidity.
669	!-- Droplet condensation and evaporation is calculated within
670	!-- advec_particles.
671	IF ( cloud_droplets .AND. &
672	intermediate_timestep_count == intermediate_timestep_count_max )&
673	THEN
674	CALL interaction_droplets_ptq
675	ENDIF
676
677	!
678	!-- Exchange of ghost points (lateral boundary conditions)
679	IF ( .NOT. background_communication ) THEN
680
681	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
682
683	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
684	on_device = .TRUE. ! to be removed after complete porting
685	ELSE ! of ghost point exchange
686	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
687	ENDIF
688
689	CALL exchange_horiz( u_p, nbgp )
690	CALL exchange_horiz( v_p, nbgp )
691	CALL exchange_horiz( w_p, nbgp )
692	CALL exchange_horiz( pt_p, nbgp )
693	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
694	IF ( ocean ) THEN
695	CALL exchange_horiz( sa_p, nbgp )
696	CALL exchange_horiz( rho, nbgp )
697	CALL exchange_horiz( prho, nbgp )
698	ENDIF
699	IF ( humidity ) THEN
700	CALL exchange_horiz( q_p, nbgp )
701	IF ( cloud_physics .AND. microphysics_seifert ) THEN
702	CALL exchange_horiz( qr_p, nbgp )
703	CALL exchange_horiz( nr_p, nbgp )
704	ENDIF
705	ENDIF
706	IF ( cloud_droplets ) THEN
707	CALL exchange_horiz( ql, nbgp )
708	CALL exchange_horiz( ql_c, nbgp )
709	CALL exchange_horiz( ql_v, nbgp )
710	CALL exchange_horiz( ql_vp, nbgp )
711	ENDIF
712	IF ( wang_kernel .OR. collision_turbulence .OR. &
713	use_sgs_for_particles ) THEN
714	CALL exchange_horiz( diss, nbgp )
715	ENDIF
716	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
717
718	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
719	on_device = .FALSE. ! to be removed after complete porting
720	ELSE ! of ghost point exchange
721	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
722	ENDIF
723
724	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
725
726	ENDIF
727
728	!
729	!-- Boundary conditions for the prognostic quantities (except of the
730	!-- velocities at the outflow in case of a non-cyclic lateral wall)
731	CALL boundary_conds
732
733	!
734	!-- Swap the time levels in preparation for the next time step.
735	CALL swap_timelevel
736
737	IF ( nested_run ) THEN
738
739	CALL cpu_log( log_point(60), 'nesting', 'start' )
740	!
741	!-- Domain nesting. The data transfer subroutines pmci_parent_datatrans
742	!-- and pmci_child_datatrans are called inside the wrapper
743	!-- subroutine pmci_datatrans according to the control parameters
744	!-- nesting_mode and nesting_datatransfer_mode.
745	!-- TO_DO: why is nesting_mode given as a parameter here?
746	CALL pmci_datatrans( nesting_mode )
747
748	IF ( TRIM( nesting_mode ) == 'two-way' .OR. &
749	nesting_mode == 'vertical' ) THEN
750	!
751	!-- Exchange_horiz is needed for all parent-domains after the
752	!-- anterpolation
753	CALL exchange_horiz( u, nbgp )
754	CALL exchange_horiz( v, nbgp )
755	CALL exchange_horiz( w, nbgp )
756	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
757	IF ( humidity ) CALL exchange_horiz( q, nbgp )
758	IF ( passive_scalar ) CALL exchange_horiz( s, nbgp )
759	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
760	ENDIF
761	!
762	!-- Correct the w top-BC in nest domains to ensure mass conservation.
763	!-- This action must never be done for the root domain. Vertical
764	!-- nesting implies mass conservation.
765	IF ( nest_domain ) THEN
766	CALL pmci_ensure_nest_mass_conservation
767	ENDIF
768
769	CALL cpu_log( log_point(60), 'nesting', 'stop' )
770
771	ENDIF
772
773	!
774	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
775	!-- when a sloping surface is used
776	IF ( sloping_surface ) THEN
777	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
778	pt_slope_offset
779	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
780	pt_slope_offset
781	ENDIF
782
783	!
784	!-- Impose a turbulent inflow using the recycling method
785	IF ( turbulent_inflow ) CALL inflow_turbulence
786
787	!
788	!-- Impose a random perturbation on the horizontal velocity field
789	IF ( create_disturbances .AND. &
790	( call_psolver_at_all_substeps .AND. &
791	intermediate_timestep_count == intermediate_timestep_count_max )&
792	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
793	intermediate_timestep_count == 1 ) ) &
794	THEN
795	time_disturb = time_disturb + dt_3d
796	IF ( time_disturb >= dt_disturb ) THEN
797	!$acc update host( u, v )
798	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
799	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
800	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
801	CALL disturb_field( nzb_u_inner, tend, u )
802	CALL disturb_field( nzb_v_inner, tend, v )
803	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
804	!
805	!-- Runs with a non-cyclic lateral wall need perturbations
806	!-- near the inflow throughout the whole simulation
807	dist_range = 1
808	CALL disturb_field( nzb_u_inner, tend, u )
809	CALL disturb_field( nzb_v_inner, tend, v )
810	dist_range = 0
811	ENDIF
812	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
813	!$acc update device( u, v )
814	time_disturb = time_disturb - dt_disturb
815	ENDIF
816	ENDIF
817
818	!
819	!-- Reduce the velocity divergence via the equation for perturbation
820	!-- pressure.
821	IF ( intermediate_timestep_count == 1 .OR. &
822	call_psolver_at_all_substeps ) THEN
823	CALL pres
824	ENDIF
825
826	!
827	!-- If required, compute liquid water content
828	IF ( cloud_physics ) THEN
829	CALL calc_liquid_water_content
830	!$acc update device( ql )
831	ENDIF
832	!
833	!-- If required, compute virtual potential temperature
834	IF ( humidity ) THEN
835	CALL compute_vpt
836	!$acc update device( vpt )
837	ENDIF
838
839	!
840	!-- Compute the diffusion quantities
841	IF ( .NOT. constant_diffusion ) THEN
842
843	!
844	!-- Determine surface fluxes shf and qsws and surface values
845	!-- pt_surface and q_surface in dependence on data from external
846	!-- file LSF_DATA respectively
847	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
848	intermediate_timestep_count == intermediate_timestep_count_max )&
849	THEN
850	CALL ls_forcing_surf ( simulated_time )
851	ENDIF
852
853	!
854	!-- First the vertical fluxes in the surface (constant flux) layer are computed
855	IF ( constant_flux_layer ) THEN
856	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
857	CALL surface_layer_fluxes
858	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
859	ENDIF
860
861	!
862	!-- If required, solve the energy balance for the surface and run soil
863	!-- model
864	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
865
866	CALL cpu_log( log_point(54), 'land_surface', 'start' )
867	CALL lsm_energy_balance
868	CALL lsm_soil_model
869	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
870	ENDIF
871	!
872	!-- Compute the diffusion coefficients
873	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
874	IF ( .NOT. humidity ) THEN
875	IF ( ocean ) THEN
876	CALL diffusivities( prho, prho_reference )
877	ELSE
878	CALL diffusivities( pt, pt_reference )
879	ENDIF
880	ELSE
881	CALL diffusivities( vpt, pt_reference )
882	ENDIF
883	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
884
885	ENDIF
886
887	!
888	!-- If required, calculate radiative fluxes and heating rates
889	IF ( radiation .AND. intermediate_timestep_count &
890	== intermediate_timestep_count_max .AND. simulated_time > &
891	skip_time_do_radiation ) THEN
892
893	time_radiation = time_radiation + dt_3d
894
895	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
896	THEN
897
898	CALL cpu_log( log_point(50), 'radiation', 'start' )
899
900	IF ( .NOT. force_radiation_call ) THEN
901	time_radiation = time_radiation - dt_radiation
902	ENDIF
903
904	CALL radiation_control
905
906	CALL cpu_log( log_point(50), 'radiation', 'stop' )
907	ENDIF
908	ENDIF
909
910	ENDDO ! Intermediate step loop
911
912	!
913	!-- Increase simulation time and output times
914	nr_timesteps_this_run = nr_timesteps_this_run + 1
915	current_timestep_number = current_timestep_number + 1
916	simulated_time = simulated_time + dt_3d
917	simulated_time_chr = time_to_string( simulated_time )
918	time_since_reference_point = simulated_time - coupling_start_time
919
920
921
922	IF ( simulated_time >= skip_time_data_output_av ) THEN
923	time_do_av = time_do_av + dt_3d
924	ENDIF
925	IF ( simulated_time >= skip_time_do2d_xy ) THEN
926	time_do2d_xy = time_do2d_xy + dt_3d
927	ENDIF
928	IF ( simulated_time >= skip_time_do2d_xz ) THEN
929	time_do2d_xz = time_do2d_xz + dt_3d
930	ENDIF
931	IF ( simulated_time >= skip_time_do2d_yz ) THEN
932	time_do2d_yz = time_do2d_yz + dt_3d
933	ENDIF
934	IF ( simulated_time >= skip_time_do3d ) THEN
935	time_do3d = time_do3d + dt_3d
936	ENDIF
937	DO mid = 1, masks
938	IF ( simulated_time >= skip_time_domask(mid) ) THEN
939	time_domask(mid)= time_domask(mid) + dt_3d
940	ENDIF
941	ENDDO
942	time_dvrp = time_dvrp + dt_3d
943	IF ( simulated_time >= skip_time_dosp ) THEN
944	time_dosp = time_dosp + dt_3d
945	ENDIF
946	time_dots = time_dots + dt_3d
947	IF ( .NOT. first_call_lpm ) THEN
948	time_dopts = time_dopts + dt_3d
949	ENDIF
950	IF ( simulated_time >= skip_time_dopr ) THEN
951	time_dopr = time_dopr + dt_3d
952	ENDIF
953	time_dopr_listing = time_dopr_listing + dt_3d
954	time_run_control = time_run_control + dt_3d
955
956	!
957	!-- Data exchange between coupled models
958	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
959	time_coupling = time_coupling + dt_3d
960
961	!
962	!-- In case of model termination initiated by the local model
963	!-- (terminate_coupled > 0), the coupler must be skipped because it would
964	!-- cause an MPI intercomminucation hang.
965	!-- If necessary, the coupler will be called at the beginning of the
966	!-- next restart run.
967	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
968	CALL surface_coupler
969	time_coupling = time_coupling - dt_coupling
970	ENDDO
971	ENDIF
972
973	!
974	!-- Execute user-defined actions
975	CALL user_actions( 'after_integration' )
976
977	!
978	!-- If Galilei transformation is used, determine the distance that the
979	!-- model has moved so far
980	IF ( galilei_transformation ) THEN
981	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
982	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
983	ENDIF
984
985	!
986	!-- Check, if restart is necessary (because cpu-time is expiring or
987	!-- because it is forced by user) and set stop flag
988	!-- This call is skipped if the remote model has already initiated a restart.
989	IF ( .NOT. terminate_run ) CALL check_for_restart
990
991	!
992	!-- Carry out statistical analysis and output at the requested output times.
993	!-- The MOD function is used for calculating the output time counters (like
994	!-- time_dopr) in order to regard a possible decrease of the output time
995	!-- interval in case of restart runs
996
997	!
998	!-- Set a flag indicating that so far no statistics have been created
999	!-- for this time step
1000	flow_statistics_called = .FALSE.
1001
1002	!
1003	!-- If required, call flow_statistics for averaging in time
1004	IF ( averaging_interval_pr /= 0.0_wp .AND. &
1005	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
1006	simulated_time >= skip_time_dopr ) THEN
1007	time_dopr_av = time_dopr_av + dt_3d
1008	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
1009	do_sum = .TRUE.
1010	time_dopr_av = MOD( time_dopr_av, &
1011	MAX( dt_averaging_input_pr, dt_3d ) )
1012	ENDIF
1013	ENDIF
1014	IF ( do_sum ) CALL flow_statistics
1015
1016	!
1017	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1018	IF ( averaging_interval /= 0.0_wp .AND. &
1019	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1020	simulated_time >= skip_time_data_output_av ) &
1021	THEN
1022	time_do_sla = time_do_sla + dt_3d
1023	IF ( time_do_sla >= dt_averaging_input ) THEN
1024	CALL sum_up_3d_data
1025	average_count_3d = average_count_3d + 1
1026	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1027	ENDIF
1028	ENDIF
1029
1030	!
1031	!-- Calculate spectra for time averaging
1032	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1033	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1034	simulated_time >= skip_time_dosp ) THEN
1035	time_dosp_av = time_dosp_av + dt_3d
1036	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1037	CALL calc_spectra
1038	time_dosp_av = MOD( time_dosp_av, &
1039	MAX( dt_averaging_input_pr, dt_3d ) )
1040	ENDIF
1041	ENDIF
1042
1043	!
1044	!-- Call flight module and output data
1045	IF ( virtual_flight ) THEN
1046	CALL flight_measurement
1047	CALL data_output_flight
1048	ENDIF
1049
1050	!
1051	!-- Profile output (ASCII) on file
1052	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1053	CALL print_1d
1054	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1055	dt_3d ) )
1056	ENDIF
1057
1058	!
1059	!-- Graphic output for PROFIL
1060	IF ( time_dopr >= dt_dopr ) THEN
1061	IF ( dopr_n /= 0 ) CALL data_output_profiles
1062	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1063	time_dopr_av = 0.0_wp ! due to averaging (see above)
1064	ENDIF
1065
1066	!
1067	!-- Graphic output for time series
1068	IF ( time_dots >= dt_dots ) THEN
1069	CALL data_output_tseries
1070	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1071	ENDIF
1072
1073	!
1074	!-- Output of spectra (formatted for use with PROFIL), in case of no
1075	!-- time averaging, spectra has to be calculated before
1076	IF ( time_dosp >= dt_dosp ) THEN
1077	IF ( average_count_sp == 0 ) CALL calc_spectra
1078	CALL data_output_spectra
1079	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1080	ENDIF
1081
1082	!
1083	!-- 2d-data output (cross-sections)
1084	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1085	CALL data_output_2d( 'xy', 0 )
1086	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1087	ENDIF
1088	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1089	CALL data_output_2d( 'xz', 0 )
1090	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1091	ENDIF
1092	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1093	CALL data_output_2d( 'yz', 0 )
1094	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1095	ENDIF
1096
1097	!
1098	!-- 3d-data output (volume data)
1099	IF ( time_do3d >= dt_do3d ) THEN
1100	CALL data_output_3d( 0 )
1101	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1102	ENDIF
1103
1104	!
1105	!-- Masked data output
1106	DO mid = 1, masks
1107	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1108	CALL data_output_mask( 0 )
1109	time_domask(mid) = MOD( time_domask(mid), &
1110	MAX( dt_domask(mid), dt_3d ) )
1111	ENDIF
1112	ENDDO
1113
1114	!
1115	!-- Output of time-averaged 2d/3d/masked data
1116	IF ( time_do_av >= dt_data_output_av ) THEN
1117	CALL average_3d_data
1118	CALL data_output_2d( 'xy', 1 )
1119	CALL data_output_2d( 'xz', 1 )
1120	CALL data_output_2d( 'yz', 1 )
1121	CALL data_output_3d( 1 )
1122	DO mid = 1, masks
1123	CALL data_output_mask( 1 )
1124	ENDDO
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	!-- Determine size of next time step. Save timestep dt_3d because it is
1162	!-- newly calculated in routine timestep, but required further below for
1163	!-- steering the run control output interval
1164	dt_3d_old = dt_3d
1165	CALL timestep
1166
1167	!
1168	!-- Synchronize the timestep in case of nested run.
1169	IF ( nested_run ) THEN
1170	!
1171	!-- Synchronize by unifying the time step.
1172	!-- Global minimum of all time-steps is used for all.
1173	CALL pmci_synchronize
1174	ENDIF
1175
1176	!
1177	!-- Computation and output of run control parameters.
1178	!-- This is also done whenever perturbations have been imposed
1179	IF ( time_run_control >= dt_run_control .OR. &
1180	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1181	THEN
1182	! IF ( current_timestep_number == 1 ) THEN
1183	! IF ( nxl < 7 .AND. nxr > 7 .AND. nys < 7 .AND. nyn > 7 ) THEN
1184	! u(10,7,7) = 0.55
1185	! ENDIF
1186	! PRINT*, 'calculating minmax'
1187	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, u, &
1188	! 'abs', 0.0_wp, u_max, u_max_ijk )
1189	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, v, &
1190	! 'abs', 0.0_wp, v_max, v_max_ijk )
1191	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, w, &
1192	! 'abs', 0.0_wp, w_max, w_max_ijk )
1193	! PRINT*, 'calculated u_max = ', u_max, ' myid = ', myid
1194	! ENDIF
1195	CALL run_control
1196	IF ( time_run_control >= dt_run_control ) THEN
1197	time_run_control = MOD( time_run_control, &
1198	MAX( dt_run_control, dt_3d_old ) )
1199	ENDIF
1200	ENDIF
1201
1202	!
1203	!-- Output elapsed simulated time in form of a progress bar on stdout
1204	IF ( myid == 0 ) CALL output_progress_bar
1205
1206	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1207
1208
1209	ENDDO ! time loop
1210
1211	IF ( myid == 0 ) CALL finish_progress_bar
1212
1213	#if defined( __dvrp_graphics )
1214	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1215	#endif
1216
1217	CALL location_message( 'finished time-stepping', .TRUE. )
1218
1219	END SUBROUTINE time_integration

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