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source: palm/trunk/SOURCE/time_integration.f90 @ 2005

Last change on this file since 2005 was 2001, checked in by knoop, 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
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2016 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: time_integration.f90 2001 2016-08-20 18:41:22Z suehring $
27	!
28	! 2000 2016-08-20 18:09:15Z knoop
29	! Forced header and separation lines into 80 columns
30	!
31	! 1976 2016-07-27 13:28:04Z maronga
32	! Simplified calls to radiation model
33	!
34	! 1960 2016-07-12 16:34:24Z suehring
35	! Separate humidity and passive scalar
36	!
37	! 1957 2016-07-07 10:43:48Z suehring
38	! flight module added
39	!
40	! 1919 2016-05-27 14:51:23Z raasch
41	! Initial version of purely vertical nesting introduced.
42	!
43	! 1918 2016-05-27 14:35:57Z raasch
44	! determination of time step moved to the end of the time step loop,
45	! the first time step is now always calculated before the time step loop (i.e.
46	! also in case of restart runs)
47	!
48	! 1914 2016-05-26 14:44:07Z witha
49	! Added call for wind turbine model
50	!
51	! 1878 2016-04-19 12:30:36Z hellstea
52	! Synchronization for nested runs rewritten
53	!
54	! 1853 2016-04-11 09:00:35Z maronga
55	! Adjusted for use with radiation_scheme = constant
56	!
57	! 1849 2016-04-08 11:33:18Z hoffmann
58	! Adapted for modularization of microphysics
59	!
60	! 1833 2016-04-07 14:23:03Z raasch
61	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
62	!
63	! 1831 2016-04-07 13:15:51Z hoffmann
64	! turbulence renamed collision_turbulence
65	!
66	! 1822 2016-04-07 07:49:42Z hoffmann
67	! icloud_scheme replaced by microphysics_*
68	!
69	! 1808 2016-04-05 19:44:00Z raasch
70	! output message in case unscheduled radiation calls removed
71	!
72	! 1797 2016-03-21 16:50:28Z raasch
73	! introduction of different datatransfer modes
74	!
75	! 1791 2016-03-11 10:41:25Z raasch
76	! call of pmci_update_new removed
77	!
78	! 1786 2016-03-08 05:49:27Z raasch
79	! +module spectrum
80	!
81	! 1783 2016-03-06 18:36:17Z raasch
82	! switch back of netcdf data format for mask output moved to the mask output
83	! routine
84	!
85	! 1781 2016-03-03 15:12:23Z raasch
86	! some pmc calls removed at the beginning (before timeloop),
87	! pmc initialization moved to the main program
88	!
89	! 1764 2016-02-28 12:45:19Z raasch
90	! PMC_ACTIVE flags removed,
91	! bugfix: nest synchronization after first call of timestep
92	!
93	! 1762 2016-02-25 12:31:13Z hellstea
94	! Introduction of nested domain feature
95	!
96	! 1736 2015-12-04 08:56:33Z raasch
97	! no perturbations added to total domain if energy limit has been set zero
98	!
99	! 1691 2015-10-26 16:17:44Z maronga
100	! Added option for spin-ups without land surface and radiation models. Moved calls
101	! for radiation and lan surface schemes.
102	!
103	! 1682 2015-10-07 23:56:08Z knoop
104	! Code annotations made doxygen readable
105	!
106	! 1671 2015-09-25 03:29:37Z raasch
107	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
108	! for particles
109	!
110	! 1585 2015-04-30 07:05:52Z maronga
111	! Moved call of radiation scheme. Added support for RRTM
112	!
113	! 1551 2015-03-03 14:18:16Z maronga
114	! Added interface for different radiation schemes.
115	!
116	! 1496 2014-12-02 17:25:50Z maronga
117	! Added calls for the land surface model and radiation scheme
118	!
119	! 1402 2014-05-09 14:25:13Z raasch
120	! location messages modified
121	!
122	! 1384 2014-05-02 14:31:06Z raasch
123	! location messages added
124	!
125	! 1380 2014-04-28 12:40:45Z heinze
126	! CALL of nudge_ref added
127	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
128	!
129	! 1365 2014-04-22 15:03:56Z boeske
130	! Reset sums_ls_l to zero at each timestep
131	! +sums_ls_l
132	! Calculation of reference state (previously in subroutine calc_mean_profile)
133
134	! 1342 2014-03-26 17:04:47Z kanani
135	! REAL constants defined as wp-kind
136	!
137	! 1320 2014-03-20 08:40:49Z raasch
138	! ONLY-attribute added to USE-statements,
139	! kind-parameters added to all INTEGER and REAL declaration statements,
140	! kinds are defined in new module kinds,
141	! old module precision_kind is removed,
142	! revision history before 2012 removed,
143	! comment fields (!:) to be used for variable explanations added to
144	! all variable declaration statements
145	! 1318 2014-03-17 13:35:16Z raasch
146	! module interfaces removed
147	!
148	! 1308 2014-03-13 14:58:42Z fricke
149	! +netcdf_data_format_save
150	! For masked data, parallel netcdf output is not tested so far, hence
151	! netcdf_data_format is switched back to non-paralell output.
152	!
153	! 1276 2014-01-15 13:40:41Z heinze
154	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
155	!
156	! 1257 2013-11-08 15:18:40Z raasch
157	! acc-update-host directive for timestep removed
158	!
159	! 1241 2013-10-30 11:36:58Z heinze
160	! Generalize calc_mean_profile for wider use
161	! Determine shf and qsws in dependence on data from LSF_DATA
162	! Determine ug and vg in dependence on data from LSF_DATA
163	! 1221 2013-09-10 08:59:13Z raasch
164	! host update of arrays before timestep is called
165	!
166	! 1179 2013-06-14 05:57:58Z raasch
167	! mean profiles for reference state are only calculated if required,
168	! small bugfix for background communication
169	!
170	! 1171 2013-05-30 11:27:45Z raasch
171	! split of prognostic_equations deactivated (comment lines), for the time being
172	!
173	! 1128 2013-04-12 06:19:32Z raasch
174	! asynchronous transfer of ghost point data realized for acc-optimized version:
175	! prognostic_equations are first called two times for those points required for
176	! the left-right and north-south exchange, respectively, and then for the
177	! remaining points,
178	! those parts requiring global communication moved from prognostic_equations to
179	! here
180	!
181	! 1115 2013-03-26 18:16:16Z hoffmann
182	! calculation of qr and nr is restricted to precipitation
183	!
184	! 1113 2013-03-10 02:48:14Z raasch
185	! GPU-porting of boundary conditions,
186	! openACC directives updated
187	! formal parameter removed from routine boundary_conds
188	!
189	! 1111 2013-03-08 23:54:10Z raasch
190	! +internal timestep counter for cpu statistics added,
191	! openACC directives updated
192	!
193	! 1092 2013-02-02 11:24:22Z raasch
194	! unused variables removed
195	!
196	! 1065 2012-11-22 17:42:36Z hoffmann
197	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
198	!
199	! 1053 2012-11-13 17:11:03Z hoffmann
200	! exchange of ghost points for nr, qr added
201	!
202	! 1036 2012-10-22 13:43:42Z raasch
203	! code put under GPL (PALM 3.9)
204	!
205	! 1019 2012-09-28 06:46:45Z raasch
206	! non-optimized version of prognostic_equations removed
207	!
208	! 1015 2012-09-27 09:23:24Z raasch
209	! +call of prognostic_equations_acc
210	!
211	! 1001 2012-09-13 14:08:46Z raasch
212	! all actions concerning leapfrog- and upstream-spline-scheme removed
213	!
214	! 849 2012-03-15 10:35:09Z raasch
215	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
216	!
217	! 825 2012-02-19 03:03:44Z raasch
218	! wang_collision_kernel renamed wang_kernel
219	!
220	! Revision 1.1 1997/08/11 06:19:04 raasch
221	! Initial revision
222	!
223	!
224	! Description:
225	! ------------
226	!> Integration in time of the model equations, statistical analysis and graphic
227	!> output
228	!------------------------------------------------------------------------------!
229	SUBROUTINE time_integration
230
231
232	USE advec_ws, &
233	ONLY: ws_statistics
234
235	USE arrays_3d, &
236	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
237	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, s, s_p, sa_p, &
238	tend, u, u_p, v, vpt, v_p, w, w_p
239
240	USE calc_mean_profile_mod, &
241	ONLY: calc_mean_profile
242
243	USE control_parameters, &
244	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
245	averaging_interval, averaging_interval_pr, &
246	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
247	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
248	cloud_physics, constant_flux_layer, constant_heatflux, &
249	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
250	coupling_start_time, current_timestep_number, &
251	disturbance_created, disturbance_energy_limit, dist_range, &
252	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
253	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
254	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
255	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
256	end_time, first_call_lpm, galilei_transformation, humidity, &
257	intermediate_timestep_count, &
258	intermediate_timestep_count_max, large_scale_forcing, &
259	loop_optimization, lsf_surf, lsf_vert, masks, &
260	microphysics_seifert, mid, nest_domain, &
261	neutral, nr_timesteps_this_run, nudging, &
262	ocean, on_device, passive_scalar, &
263	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
264	run_coupled, simulated_time, simulated_time_chr, &
265	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
266	skip_time_do3d, skip_time_domask, skip_time_dopr, &
267	skip_time_data_output_av, sloping_surface, &
268	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
269	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
270	time_do3d, time_domask, time_dopr, time_dopr_av, &
271	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
272	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
273	time_run_control, time_since_reference_point, &
274	turbulent_inflow, use_initial_profile_as_reference, &
275	use_single_reference_value, u_gtrans, v_gtrans, virtual_flight, &
276	ws_scheme_mom, ws_scheme_sca
277
278	USE cpulog, &
279	ONLY: cpu_log, log_point, log_point_s
280
281	USE flight_mod, &
282	ONLY: flight_measurement
283
284
285	USE indices, &
286	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
287	nxrg, nyn, nyng, nys, nysg, nzb, nzt, nzb_u_inner, nzb_v_inner
288
289	USE interaction_droplets_ptq_mod, &
290	ONLY: interaction_droplets_ptq
291
292	USE interfaces
293
294	USE kinds
295
296	USE land_surface_model_mod, &
297	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
298	skip_time_do_lsm
299
300	USE ls_forcing_mod, &
301	ONLY: ls_forcing_surf, ls_forcing_vert
302
303	USE microphysics_mod, &
304	ONLY: collision_turbulence
305
306	USE nudge_mod, &
307	ONLY: calc_tnudge, nudge_ref
308
309	USE particle_attributes, &
310	ONLY: particle_advection, particle_advection_start, &
311	use_sgs_for_particles, wang_kernel
312
313	USE pegrid
314
315	USE pmc_interface, &
316	ONLY: nested_run, nesting_mode, pmci_datatrans, &
317	pmci_ensure_nest_mass_conservation, pmci_synchronize
318
319	USE production_e_mod, &
320	ONLY: production_e_init
321
322	USE progress_bar, &
323	ONLY: finish_progress_bar, output_progress_bar
324
325	USE prognostic_equations_mod, &
326	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
327	prognostic_equations_vector
328
329	USE radiation_model_mod, &
330	ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
331	skip_time_do_radiation, time_radiation
332
333	USE spectra_mod, &
334	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
335	skip_time_dosp
336
337	USE statistics, &
338	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l, u_max, &
339	u_max_ijk, v_max, v_max_ijk, w_max, w_max_ijk
340
341	USE surface_layer_fluxes_mod, &
342	ONLY: surface_layer_fluxes
343
344	USE user_actions_mod, &
345	ONLY: user_actions
346
347	USE wind_turbine_model_mod, &
348	ONLY: wind_turbine, wtm_forces
349
350	IMPLICIT NONE
351
352	CHARACTER (LEN=9) :: time_to_string !<
353
354	REAL(wp) :: dt_3d_old !< temporary storage of timestep to be used for
355	!< steering of run control output interval
356
357	!
358	!-- At beginning determine the first time step
359	CALL timestep
360
361	!
362	!-- Synchronize the timestep in case of nested run.
363	IF ( nested_run ) THEN
364	!
365	!-- Synchronization by unifying the time step.
366	!-- Global minimum of all time-steps is used for all.
367	CALL pmci_synchronize
368	ENDIF
369
370	!
371	!-- Determine and print out the run control quantities before the first time
372	!-- step of this run. For the initial run, some statistics (e.g. divergence)
373	!-- need to be determined first.
374	IF ( simulated_time == 0.0_wp ) CALL flow_statistics
375	CALL run_control
376
377	!
378	!-- Data exchange between coupled models in case that a call has been omitted
379	!-- at the end of the previous run of a job chain.
380	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
381	!
382	!-- In case of model termination initiated by the local model the coupler
383	!-- must not be called because this would again cause an MPI hang.
384	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
385	CALL surface_coupler
386	time_coupling = time_coupling - dt_coupling
387	ENDDO
388	IF (time_coupling == 0.0_wp .AND. &
389	time_since_reference_point < dt_coupling ) &
390	THEN
391	time_coupling = time_since_reference_point
392	ENDIF
393	ENDIF
394
395	#if defined( __dvrp_graphics )
396	!
397	!-- Time measurement with dvrp software
398	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
399	#endif
400
401	CALL location_message( 'start with time-stepping', .TRUE. )
402	!
403	!-- Start of the time loop
404	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
405	.NOT. terminate_run )
406
407	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
408
409	!
410	!-- Determine ug, vg and w_subs in dependence on data from external file
411	!-- LSF_DATA
412	IF ( large_scale_forcing .AND. lsf_vert ) THEN
413	CALL ls_forcing_vert ( simulated_time )
414	sums_ls_l = 0.0_wp
415	ENDIF
416
417	!
418	!-- Set pt_init and q_init to the current profiles taken from
419	!-- NUDGING_DATA
420	IF ( nudging ) THEN
421	CALL nudge_ref ( simulated_time )
422	!
423	!-- Store temperature gradient at the top boundary for possible Neumann
424	!-- boundary condition
425	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
426	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
427	ENDIF
428
429	!
430	!-- Execute the user-defined actions
431	CALL user_actions( 'before_timestep' )
432
433	!
434	!-- Calculate forces by wind turbines
435	IF ( wind_turbine ) THEN
436
437	CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
438
439	CALL wtm_forces
440
441	CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
442
443	ENDIF
444
445	!
446	!-- Start of intermediate step loop
447	intermediate_timestep_count = 0
448	DO WHILE ( intermediate_timestep_count < &
449	intermediate_timestep_count_max )
450
451	intermediate_timestep_count = intermediate_timestep_count + 1
452
453	!
454	!-- Set the steering factors for the prognostic equations which depend
455	!-- on the timestep scheme
456	CALL timestep_scheme_steering
457
458	!
459	!-- Calculate those variables needed in the tendency terms which need
460	!-- global communication
461	IF ( .NOT. use_single_reference_value .AND. &
462	.NOT. use_initial_profile_as_reference ) THEN
463	!
464	!-- Horizontally averaged profiles to be used as reference state in
465	!-- buoyancy terms (WARNING: only the respective last call of
466	!-- calc_mean_profile defines the reference state!)
467	IF ( .NOT. neutral ) THEN
468	CALL calc_mean_profile( pt, 4 )
469	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
470	ENDIF
471	IF ( ocean ) THEN
472	CALL calc_mean_profile( rho, 64 )
473	ref_state(:) = hom(:,1,64,0)
474	ENDIF
475	IF ( humidity ) THEN
476	CALL calc_mean_profile( vpt, 44 )
477	ref_state(:) = hom(:,1,44,0)
478	ENDIF
479
480	ENDIF
481
482	IF ( .NOT. constant_diffusion ) CALL production_e_init
483	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
484	intermediate_timestep_count == 1 ) CALL ws_statistics
485	!
486	!-- In case of nudging calculate current nudging time scale and horizontal
487	!-- means of u, v, pt and q
488	IF ( nudging ) THEN
489	CALL calc_tnudge( simulated_time )
490	CALL calc_mean_profile( u, 1 )
491	CALL calc_mean_profile( v, 2 )
492	CALL calc_mean_profile( pt, 4 )
493	CALL calc_mean_profile( q, 41 )
494	ENDIF
495
496	!
497	!-- Solve the prognostic equations. A fast cache optimized version with
498	!-- only one single loop is used in case of Piascek-Williams advection
499	!-- scheme. NEC vector machines use a different version, because
500	!-- in the other versions a good vectorization is prohibited due to
501	!-- inlining problems.
502	IF ( loop_optimization == 'cache' ) THEN
503	CALL prognostic_equations_cache
504	ELSEIF ( loop_optimization == 'vector' ) THEN
505	CALL prognostic_equations_vector
506	ELSEIF ( loop_optimization == 'acc' ) THEN
507	i_left = nxl; i_right = nxr
508	j_south = nys; j_north = nyn
509	CALL prognostic_equations_acc
510
511	! i_left = nxl; i_right = nxl+nbgp-1
512	! j_south = nys; j_north = nyn
513	! CALL prognostic_equations_acc
514	! i_left = nxr-nbgp+1; i_right = nxr
515	! j_south = nys; j_north = nyn
516	! CALL prognostic_equations_acc
517
518	!
519	!-- Exchange of ghost points (lateral boundary conditions)
520	IF ( background_communication ) THEN
521
522	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
523
524	send_receive = 'lr'
525	sendrecv_in_background = .TRUE.
526	req = 0
527	req_count = 0
528
529	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
530	on_device = .TRUE. ! to be removed after complete porting
531	ELSE ! of ghost point exchange
532	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
533	ENDIF
534
535	CALL exchange_horiz( u_p, nbgp )
536	CALL exchange_horiz( v_p, nbgp )
537	CALL exchange_horiz( w_p, nbgp )
538	CALL exchange_horiz( pt_p, nbgp )
539	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
540	IF ( ocean ) THEN
541	CALL exchange_horiz( sa_p, nbgp )
542	CALL exchange_horiz( rho, nbgp )
543	CALL exchange_horiz( prho, nbgp )
544	ENDIF
545	IF ( humidity ) THEN
546	CALL exchange_horiz( q_p, nbgp )
547	IF ( cloud_physics .AND. microphysics_seifert ) THEN
548	CALL exchange_horiz( qr_p, nbgp )
549	CALL exchange_horiz( nr_p, nbgp )
550	ENDIF
551	ENDIF
552	IF ( cloud_droplets ) THEN
553	CALL exchange_horiz( ql, nbgp )
554	CALL exchange_horiz( ql_c, nbgp )
555	CALL exchange_horiz( ql_v, nbgp )
556	CALL exchange_horiz( ql_vp, nbgp )
557	ENDIF
558	IF ( wang_kernel .OR. collision_turbulence .OR. &
559	use_sgs_for_particles ) THEN
560	CALL exchange_horiz( diss, nbgp )
561	ENDIF
562	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
563
564	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
565	on_device = .FALSE. ! to be removed after complete porting
566	ELSE ! of ghost point exchange
567	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
568	ENDIF
569
570	sendrecv_in_background = .FALSE.
571
572	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
573
574	ENDIF
575
576	! i_left = nxl+nbgp; i_right = nxr-nbgp
577	! j_south = nys; j_north = nys+nbgp-1
578	! CALL prognostic_equations_acc
579	! i_left = nxl+nbgp; i_right = nxr-nbgp
580	! j_south = nyn-nbgp+1; j_north = nyn
581	! CALL prognostic_equations_acc
582
583	IF ( background_communication ) THEN
584	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
585	#if defined( __parallel )
586	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
587	#endif
588	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
589
590	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
591
592	send_receive = 'ns'
593	sendrecv_in_background = .TRUE.
594	req = 0
595	req_count = 0
596
597	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
598	on_device = .TRUE. ! to be removed after complete porting
599	ELSE ! of ghost point exchange
600	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
601	ENDIF
602
603	CALL exchange_horiz( u_p, nbgp )
604	CALL exchange_horiz( v_p, nbgp )
605	CALL exchange_horiz( w_p, nbgp )
606	CALL exchange_horiz( pt_p, nbgp )
607	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
608	IF ( ocean ) THEN
609	CALL exchange_horiz( sa_p, nbgp )
610	CALL exchange_horiz( rho, nbgp )
611	CALL exchange_horiz( prho, nbgp )
612	ENDIF
613	IF ( humidity ) THEN
614	CALL exchange_horiz( q_p, nbgp )
615	IF ( cloud_physics .AND. microphysics_seifert ) THEN
616	CALL exchange_horiz( qr_p, nbgp )
617	CALL exchange_horiz( nr_p, nbgp )
618	ENDIF
619	ENDIF
620	IF ( cloud_droplets ) THEN
621	CALL exchange_horiz( ql, nbgp )
622	CALL exchange_horiz( ql_c, nbgp )
623	CALL exchange_horiz( ql_v, nbgp )
624	CALL exchange_horiz( ql_vp, nbgp )
625	ENDIF
626	IF ( wang_kernel .OR. collision_turbulence .OR. &
627	use_sgs_for_particles ) THEN
628	CALL exchange_horiz( diss, nbgp )
629	ENDIF
630	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
631
632	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
633	on_device = .FALSE. ! to be removed after complete porting
634	ELSE ! of ghost point exchange
635	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
636	ENDIF
637
638	sendrecv_in_background = .FALSE.
639
640	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
641
642	ENDIF
643
644	! i_left = nxl+nbgp; i_right = nxr-nbgp
645	! j_south = nys+nbgp; j_north = nyn-nbgp
646	! CALL prognostic_equations_acc
647
648	IF ( background_communication ) THEN
649	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
650	#if defined( __parallel )
651	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
652	#endif
653	send_receive = 'al'
654	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
655	ENDIF
656
657	ENDIF
658
659	!
660	!-- Particle transport/physics with the Lagrangian particle model
661	!-- (only once during intermediate steps, because it uses an Euler-step)
662	!-- ### particle model should be moved before prognostic_equations, in order
663	!-- to regard droplet interactions directly
664	IF ( particle_advection .AND. &
665	simulated_time >= particle_advection_start .AND. &
666	intermediate_timestep_count == 1 ) THEN
667	CALL lpm
668	first_call_lpm = .FALSE.
669	ENDIF
670
671	!
672	!-- Interaction of droplets with temperature and specific humidity.
673	!-- Droplet condensation and evaporation is calculated within
674	!-- advec_particles.
675	IF ( cloud_droplets .AND. &
676	intermediate_timestep_count == intermediate_timestep_count_max )&
677	THEN
678	CALL interaction_droplets_ptq
679	ENDIF
680
681	!
682	!-- Exchange of ghost points (lateral boundary conditions)
683	IF ( .NOT. background_communication ) THEN
684
685	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
686
687	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
688	on_device = .TRUE. ! to be removed after complete porting
689	ELSE ! of ghost point exchange
690	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
691	ENDIF
692
693	CALL exchange_horiz( u_p, nbgp )
694	CALL exchange_horiz( v_p, nbgp )
695	CALL exchange_horiz( w_p, nbgp )
696	CALL exchange_horiz( pt_p, nbgp )
697	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
698	IF ( ocean ) THEN
699	CALL exchange_horiz( sa_p, nbgp )
700	CALL exchange_horiz( rho, nbgp )
701	CALL exchange_horiz( prho, nbgp )
702	ENDIF
703	IF ( humidity ) THEN
704	CALL exchange_horiz( q_p, nbgp )
705	IF ( cloud_physics .AND. microphysics_seifert ) THEN
706	CALL exchange_horiz( qr_p, nbgp )
707	CALL exchange_horiz( nr_p, nbgp )
708	ENDIF
709	ENDIF
710	IF ( cloud_droplets ) THEN
711	CALL exchange_horiz( ql, nbgp )
712	CALL exchange_horiz( ql_c, nbgp )
713	CALL exchange_horiz( ql_v, nbgp )
714	CALL exchange_horiz( ql_vp, nbgp )
715	ENDIF
716	IF ( wang_kernel .OR. collision_turbulence .OR. &
717	use_sgs_for_particles ) THEN
718	CALL exchange_horiz( diss, nbgp )
719	ENDIF
720	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
721
722	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
723	on_device = .FALSE. ! to be removed after complete porting
724	ELSE ! of ghost point exchange
725	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
726	ENDIF
727
728	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
729
730	ENDIF
731
732	!
733	!-- Boundary conditions for the prognostic quantities (except of the
734	!-- velocities at the outflow in case of a non-cyclic lateral wall)
735	CALL boundary_conds
736
737	!
738	!-- Swap the time levels in preparation for the next time step.
739	CALL swap_timelevel
740
741	IF ( nested_run ) THEN
742
743	CALL cpu_log( log_point(60), 'nesting', 'start' )
744	!
745	!-- Domain nesting. The data transfer subroutines pmci_parent_datatrans
746	!-- and pmci_child_datatrans are called inside the wrapper
747	!-- subroutine pmci_datatrans according to the control parameters
748	!-- nesting_mode and nesting_datatransfer_mode.
749	!-- TO_DO: why is nesting_mode given as a parameter here?
750	CALL pmci_datatrans( nesting_mode )
751
752	IF ( TRIM( nesting_mode ) == 'two-way' .OR. &
753	nesting_mode == 'vertical' ) THEN
754	!
755	!-- Exchange_horiz is needed for all parent-domains after the
756	!-- anterpolation
757	CALL exchange_horiz( u, nbgp )
758	CALL exchange_horiz( v, nbgp )
759	CALL exchange_horiz( w, nbgp )
760	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
761	IF ( humidity ) CALL exchange_horiz( q, nbgp )
762	IF ( passive_scalar ) CALL exchange_horiz( s, nbgp )
763	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
764	ENDIF
765	!
766	!-- Correct the w top-BC in nest domains to ensure mass conservation.
767	!-- This action must never be done for the root domain. Vertical
768	!-- nesting implies mass conservation.
769	IF ( nest_domain ) THEN
770	CALL pmci_ensure_nest_mass_conservation
771	ENDIF
772
773	CALL cpu_log( log_point(60), 'nesting', 'stop' )
774
775	ENDIF
776
777	!
778	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
779	!-- when a sloping surface is used
780	IF ( sloping_surface ) THEN
781	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
782	pt_slope_offset
783	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
784	pt_slope_offset
785	ENDIF
786
787	!
788	!-- Impose a turbulent inflow using the recycling method
789	IF ( turbulent_inflow ) CALL inflow_turbulence
790
791	!
792	!-- Impose a random perturbation on the horizontal velocity field
793	IF ( create_disturbances .AND. &
794	( call_psolver_at_all_substeps .AND. &
795	intermediate_timestep_count == intermediate_timestep_count_max )&
796	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
797	intermediate_timestep_count == 1 ) ) &
798	THEN
799	time_disturb = time_disturb + dt_3d
800	IF ( time_disturb >= dt_disturb ) THEN
801	!$acc update host( u, v )
802	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
803	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
804	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
805	CALL disturb_field( nzb_u_inner, tend, u )
806	CALL disturb_field( nzb_v_inner, tend, v )
807	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
808	!
809	!-- Runs with a non-cyclic lateral wall need perturbations
810	!-- near the inflow throughout the whole simulation
811	dist_range = 1
812	CALL disturb_field( nzb_u_inner, tend, u )
813	CALL disturb_field( nzb_v_inner, tend, v )
814	dist_range = 0
815	ENDIF
816	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
817	!$acc update device( u, v )
818	time_disturb = time_disturb - dt_disturb
819	ENDIF
820	ENDIF
821
822	!
823	!-- Reduce the velocity divergence via the equation for perturbation
824	!-- pressure.
825	IF ( intermediate_timestep_count == 1 .OR. &
826	call_psolver_at_all_substeps ) THEN
827	CALL pres
828	ENDIF
829
830	!
831	!-- If required, compute liquid water content
832	IF ( cloud_physics ) THEN
833	CALL calc_liquid_water_content
834	!$acc update device( ql )
835	ENDIF
836	!
837	!-- If required, compute virtual potential temperature
838	IF ( humidity ) THEN
839	CALL compute_vpt
840	!$acc update device( vpt )
841	ENDIF
842
843	!
844	!-- Compute the diffusion quantities
845	IF ( .NOT. constant_diffusion ) THEN
846
847	!
848	!-- Determine surface fluxes shf and qsws and surface values
849	!-- pt_surface and q_surface in dependence on data from external
850	!-- file LSF_DATA respectively
851	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
852	intermediate_timestep_count == intermediate_timestep_count_max )&
853	THEN
854	CALL ls_forcing_surf ( simulated_time )
855	ENDIF
856
857	!
858	!-- First the vertical fluxes in the surface (constant flux) layer are computed
859	IF ( constant_flux_layer ) THEN
860	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
861	CALL surface_layer_fluxes
862	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
863	ENDIF
864
865	!
866	!-- If required, solve the energy balance for the surface and run soil
867	!-- model
868	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
869
870	CALL cpu_log( log_point(54), 'land_surface', 'start' )
871	CALL lsm_energy_balance
872	CALL lsm_soil_model
873	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
874	ENDIF
875	!
876	!-- Compute the diffusion coefficients
877	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
878	IF ( .NOT. humidity ) THEN
879	IF ( ocean ) THEN
880	CALL diffusivities( prho, prho_reference )
881	ELSE
882	CALL diffusivities( pt, pt_reference )
883	ENDIF
884	ELSE
885	CALL diffusivities( vpt, pt_reference )
886	ENDIF
887	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
888
889	ENDIF
890
891	!
892	!-- If required, calculate radiative fluxes and heating rates
893	IF ( radiation .AND. intermediate_timestep_count &
894	== intermediate_timestep_count_max .AND. simulated_time > &
895	skip_time_do_radiation ) THEN
896
897	time_radiation = time_radiation + dt_3d
898
899	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
900	THEN
901
902	CALL cpu_log( log_point(50), 'radiation', 'start' )
903
904	IF ( .NOT. force_radiation_call ) THEN
905	time_radiation = time_radiation - dt_radiation
906	ENDIF
907
908	CALL radiation_control
909
910	CALL cpu_log( log_point(50), 'radiation', 'stop' )
911	ENDIF
912	ENDIF
913
914	ENDDO ! Intermediate step loop
915
916	!
917	!-- Increase simulation time and output times
918	nr_timesteps_this_run = nr_timesteps_this_run + 1
919	current_timestep_number = current_timestep_number + 1
920	simulated_time = simulated_time + dt_3d
921	simulated_time_chr = time_to_string( simulated_time )
922	time_since_reference_point = simulated_time - coupling_start_time
923
924
925
926	IF ( simulated_time >= skip_time_data_output_av ) THEN
927	time_do_av = time_do_av + dt_3d
928	ENDIF
929	IF ( simulated_time >= skip_time_do2d_xy ) THEN
930	time_do2d_xy = time_do2d_xy + dt_3d
931	ENDIF
932	IF ( simulated_time >= skip_time_do2d_xz ) THEN
933	time_do2d_xz = time_do2d_xz + dt_3d
934	ENDIF
935	IF ( simulated_time >= skip_time_do2d_yz ) THEN
936	time_do2d_yz = time_do2d_yz + dt_3d
937	ENDIF
938	IF ( simulated_time >= skip_time_do3d ) THEN
939	time_do3d = time_do3d + dt_3d
940	ENDIF
941	DO mid = 1, masks
942	IF ( simulated_time >= skip_time_domask(mid) ) THEN
943	time_domask(mid)= time_domask(mid) + dt_3d
944	ENDIF
945	ENDDO
946	time_dvrp = time_dvrp + dt_3d
947	IF ( simulated_time >= skip_time_dosp ) THEN
948	time_dosp = time_dosp + dt_3d
949	ENDIF
950	time_dots = time_dots + dt_3d
951	IF ( .NOT. first_call_lpm ) THEN
952	time_dopts = time_dopts + dt_3d
953	ENDIF
954	IF ( simulated_time >= skip_time_dopr ) THEN
955	time_dopr = time_dopr + dt_3d
956	ENDIF
957	time_dopr_listing = time_dopr_listing + dt_3d
958	time_run_control = time_run_control + dt_3d
959
960	!
961	!-- Data exchange between coupled models
962	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
963	time_coupling = time_coupling + dt_3d
964
965	!
966	!-- In case of model termination initiated by the local model
967	!-- (terminate_coupled > 0), the coupler must be skipped because it would
968	!-- cause an MPI intercomminucation hang.
969	!-- If necessary, the coupler will be called at the beginning of the
970	!-- next restart run.
971	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
972	CALL surface_coupler
973	time_coupling = time_coupling - dt_coupling
974	ENDDO
975	ENDIF
976
977	!
978	!-- Execute user-defined actions
979	CALL user_actions( 'after_integration' )
980
981	!
982	!-- If Galilei transformation is used, determine the distance that the
983	!-- model has moved so far
984	IF ( galilei_transformation ) THEN
985	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
986	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
987	ENDIF
988
989	!
990	!-- Check, if restart is necessary (because cpu-time is expiring or
991	!-- because it is forced by user) and set stop flag
992	!-- This call is skipped if the remote model has already initiated a restart.
993	IF ( .NOT. terminate_run ) CALL check_for_restart
994
995	!
996	!-- Carry out statistical analysis and output at the requested output times.
997	!-- The MOD function is used for calculating the output time counters (like
998	!-- time_dopr) in order to regard a possible decrease of the output time
999	!-- interval in case of restart runs
1000
1001	!
1002	!-- Set a flag indicating that so far no statistics have been created
1003	!-- for this time step
1004	flow_statistics_called = .FALSE.
1005
1006	!
1007	!-- If required, call flow_statistics for averaging in time
1008	IF ( averaging_interval_pr /= 0.0_wp .AND. &
1009	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
1010	simulated_time >= skip_time_dopr ) THEN
1011	time_dopr_av = time_dopr_av + dt_3d
1012	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
1013	do_sum = .TRUE.
1014	time_dopr_av = MOD( time_dopr_av, &
1015	MAX( dt_averaging_input_pr, dt_3d ) )
1016	ENDIF
1017	ENDIF
1018	IF ( do_sum ) CALL flow_statistics
1019
1020	!
1021	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1022	IF ( averaging_interval /= 0.0_wp .AND. &
1023	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1024	simulated_time >= skip_time_data_output_av ) &
1025	THEN
1026	time_do_sla = time_do_sla + dt_3d
1027	IF ( time_do_sla >= dt_averaging_input ) THEN
1028	CALL sum_up_3d_data
1029	average_count_3d = average_count_3d + 1
1030	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1031	ENDIF
1032	ENDIF
1033
1034	!
1035	!-- Calculate spectra for time averaging
1036	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1037	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1038	simulated_time >= skip_time_dosp ) THEN
1039	time_dosp_av = time_dosp_av + dt_3d
1040	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1041	CALL calc_spectra
1042	time_dosp_av = MOD( time_dosp_av, &
1043	MAX( dt_averaging_input_pr, dt_3d ) )
1044	ENDIF
1045	ENDIF
1046
1047	!
1048	!-- Call flight module and output data
1049	IF ( virtual_flight ) THEN
1050	CALL flight_measurement
1051	CALL data_output_flight
1052	ENDIF
1053
1054	!
1055	!-- Profile output (ASCII) on file
1056	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1057	CALL print_1d
1058	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1059	dt_3d ) )
1060	ENDIF
1061
1062	!
1063	!-- Graphic output for PROFIL
1064	IF ( time_dopr >= dt_dopr ) THEN
1065	IF ( dopr_n /= 0 ) CALL data_output_profiles
1066	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1067	time_dopr_av = 0.0_wp ! due to averaging (see above)
1068	ENDIF
1069
1070	!
1071	!-- Graphic output for time series
1072	IF ( time_dots >= dt_dots ) THEN
1073	CALL data_output_tseries
1074	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1075	ENDIF
1076
1077	!
1078	!-- Output of spectra (formatted for use with PROFIL), in case of no
1079	!-- time averaging, spectra has to be calculated before
1080	IF ( time_dosp >= dt_dosp ) THEN
1081	IF ( average_count_sp == 0 ) CALL calc_spectra
1082	CALL data_output_spectra
1083	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1084	ENDIF
1085
1086	!
1087	!-- 2d-data output (cross-sections)
1088	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1089	CALL data_output_2d( 'xy', 0 )
1090	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1091	ENDIF
1092	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1093	CALL data_output_2d( 'xz', 0 )
1094	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1095	ENDIF
1096	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1097	CALL data_output_2d( 'yz', 0 )
1098	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1099	ENDIF
1100
1101	!
1102	!-- 3d-data output (volume data)
1103	IF ( time_do3d >= dt_do3d ) THEN
1104	CALL data_output_3d( 0 )
1105	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1106	ENDIF
1107
1108	!
1109	!-- Masked data output
1110	DO mid = 1, masks
1111	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1112	CALL data_output_mask( 0 )
1113	time_domask(mid) = MOD( time_domask(mid), &
1114	MAX( dt_domask(mid), dt_3d ) )
1115	ENDIF
1116	ENDDO
1117
1118	!
1119	!-- Output of time-averaged 2d/3d/masked data
1120	IF ( time_do_av >= dt_data_output_av ) THEN
1121	CALL average_3d_data
1122	CALL data_output_2d( 'xy', 1 )
1123	CALL data_output_2d( 'xz', 1 )
1124	CALL data_output_2d( 'yz', 1 )
1125	CALL data_output_3d( 1 )
1126	DO mid = 1, masks
1127	CALL data_output_mask( 1 )
1128	ENDDO
1129	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1130	ENDIF
1131
1132	!
1133	!-- Output of particle time series
1134	IF ( particle_advection ) THEN
1135	IF ( time_dopts >= dt_dopts .OR. &
1136	( simulated_time >= particle_advection_start .AND. &
1137	first_call_lpm ) ) THEN
1138	CALL data_output_ptseries
1139	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1140	ENDIF
1141	ENDIF
1142
1143	!
1144	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1145	#if defined( __dvrp_graphics )
1146	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1147	#endif
1148	IF ( time_dvrp >= dt_dvrp ) THEN
1149	CALL data_output_dvrp
1150	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1151	ENDIF
1152	#if defined( __dvrp_graphics )
1153	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1154	#endif
1155
1156	!
1157	!-- If required, set the heat flux for the next time step at a random value
1158	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1159
1160	!
1161	!-- Execute user-defined actions
1162	CALL user_actions( 'after_timestep' )
1163
1164	!
1165	!-- Determine size of next time step. Save timestep dt_3d because it is
1166	!-- newly calculated in routine timestep, but required further below for
1167	!-- steering the run control output interval
1168	dt_3d_old = dt_3d
1169	CALL timestep
1170
1171	!
1172	!-- Synchronize the timestep in case of nested run.
1173	IF ( nested_run ) THEN
1174	!
1175	!-- Synchronize by unifying the time step.
1176	!-- Global minimum of all time-steps is used for all.
1177	CALL pmci_synchronize
1178	ENDIF
1179
1180	!
1181	!-- Computation and output of run control parameters.
1182	!-- This is also done whenever perturbations have been imposed
1183	IF ( time_run_control >= dt_run_control .OR. &
1184	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1185	THEN
1186	! IF ( current_timestep_number == 1 ) THEN
1187	! IF ( nxl < 7 .AND. nxr > 7 .AND. nys < 7 .AND. nyn > 7 ) THEN
1188	! u(10,7,7) = 0.55
1189	! ENDIF
1190	! PRINT*, 'calculating minmax'
1191	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, u, &
1192	! 'abs', 0.0_wp, u_max, u_max_ijk )
1193	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, v, &
1194	! 'abs', 0.0_wp, v_max, v_max_ijk )
1195	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, w, &
1196	! 'abs', 0.0_wp, w_max, w_max_ijk )
1197	! PRINT*, 'calculated u_max = ', u_max, ' myid = ', myid
1198	! ENDIF
1199	CALL run_control
1200	IF ( time_run_control >= dt_run_control ) THEN
1201	time_run_control = MOD( time_run_control, &
1202	MAX( dt_run_control, dt_3d_old ) )
1203	ENDIF
1204	ENDIF
1205
1206	!
1207	!-- Output elapsed simulated time in form of a progress bar on stdout
1208	IF ( myid == 0 ) CALL output_progress_bar
1209
1210	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1211
1212
1213	ENDDO ! time loop
1214
1215	IF ( myid == 0 ) CALL finish_progress_bar
1216
1217	#if defined( __dvrp_graphics )
1218	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1219	#endif
1220
1221	CALL location_message( 'finished time-stepping', .TRUE. )
1222
1223	END SUBROUTINE time_integration

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