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source: palm/trunk/SOURCE/time_integration.f90 @ 1976

Last change on this file since 1976 was 1976, checked in by maronga, 8 years ago
further modularization of land surface model (2D/3D output and restart data). Bugfix for restart runs without land surface model
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File size: 46.6 KB

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

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