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source: palm/trunk/SOURCE/time_integration.f90 @ 2020

Last change on this file since 2020 was 2012, checked in by kanani, 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 2012 2016-09-19 17:31:38Z hellstea $
27	!
28	! 2011 2016-09-19 17:29:57Z kanani
29	! Flag urban_surface is now defined in module control_parameters,
30	! removed commented CALLs of global_min_max.
31	!
32	! 2007 2016-08-24 15:47:17Z kanani
33	! Added CALLs for new urban surface model
34	!
35	! 2000 2016-08-20 18:09:15Z knoop
36	! Forced header and separation lines into 80 columns
37	!
38	! 1976 2016-07-27 13:28:04Z maronga
39	! Simplified calls to radiation model
40	!
41	! 1960 2016-07-12 16:34:24Z suehring
42	! Separate humidity and passive scalar
43	!
44	! 1957 2016-07-07 10:43:48Z suehring
45	! flight module added
46	!
47	! 1919 2016-05-27 14:51:23Z raasch
48	! Initial version of purely vertical nesting introduced.
49	!
50	! 1918 2016-05-27 14:35:57Z raasch
51	! determination of time step moved to the end of the time step loop,
52	! the first time step is now always calculated before the time step loop (i.e.
53	! also in case of restart runs)
54	!
55	! 1914 2016-05-26 14:44:07Z witha
56	! Added call for wind turbine model
57	!
58	! 1878 2016-04-19 12:30:36Z hellstea
59	! Synchronization for nested runs rewritten
60	!
61	! 1853 2016-04-11 09:00:35Z maronga
62	! Adjusted for use with radiation_scheme = constant
63	!
64	! 1849 2016-04-08 11:33:18Z hoffmann
65	! Adapted for modularization of microphysics
66	!
67	! 1833 2016-04-07 14:23:03Z raasch
68	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
69	!
70	! 1831 2016-04-07 13:15:51Z hoffmann
71	! turbulence renamed collision_turbulence
72	!
73	! 1822 2016-04-07 07:49:42Z hoffmann
74	! icloud_scheme replaced by microphysics_*
75	!
76	! 1808 2016-04-05 19:44:00Z raasch
77	! output message in case unscheduled radiation calls removed
78	!
79	! 1797 2016-03-21 16:50:28Z raasch
80	! introduction of different datatransfer modes
81	!
82	! 1791 2016-03-11 10:41:25Z raasch
83	! call of pmci_update_new removed
84	!
85	! 1786 2016-03-08 05:49:27Z raasch
86	! +module spectrum
87	!
88	! 1783 2016-03-06 18:36:17Z raasch
89	! switch back of netcdf data format for mask output moved to the mask output
90	! routine
91	!
92	! 1781 2016-03-03 15:12:23Z raasch
93	! some pmc calls removed at the beginning (before timeloop),
94	! pmc initialization moved to the main program
95	!
96	! 1764 2016-02-28 12:45:19Z raasch
97	! PMC_ACTIVE flags removed,
98	! bugfix: nest synchronization after first call of timestep
99	!
100	! 1762 2016-02-25 12:31:13Z hellstea
101	! Introduction of nested domain feature
102	!
103	! 1736 2015-12-04 08:56:33Z raasch
104	! no perturbations added to total domain if energy limit has been set zero
105	!
106	! 1691 2015-10-26 16:17:44Z maronga
107	! Added option for spin-ups without land surface and radiation models. Moved calls
108	! for radiation and lan surface schemes.
109	!
110	! 1682 2015-10-07 23:56:08Z knoop
111	! Code annotations made doxygen readable
112	!
113	! 1671 2015-09-25 03:29:37Z raasch
114	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
115	! for particles
116	!
117	! 1585 2015-04-30 07:05:52Z maronga
118	! Moved call of radiation scheme. Added support for RRTM
119	!
120	! 1551 2015-03-03 14:18:16Z maronga
121	! Added interface for different radiation schemes.
122	!
123	! 1496 2014-12-02 17:25:50Z maronga
124	! Added calls for the land surface model and radiation scheme
125	!
126	! 1402 2014-05-09 14:25:13Z raasch
127	! location messages modified
128	!
129	! 1384 2014-05-02 14:31:06Z raasch
130	! location messages added
131	!
132	! 1380 2014-04-28 12:40:45Z heinze
133	! CALL of nudge_ref added
134	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
135	!
136	! 1365 2014-04-22 15:03:56Z boeske
137	! Reset sums_ls_l to zero at each timestep
138	! +sums_ls_l
139	! Calculation of reference state (previously in subroutine calc_mean_profile)
140
141	! 1342 2014-03-26 17:04:47Z kanani
142	! REAL constants defined as wp-kind
143	!
144	! 1320 2014-03-20 08:40:49Z raasch
145	! ONLY-attribute added to USE-statements,
146	! kind-parameters added to all INTEGER and REAL declaration statements,
147	! kinds are defined in new module kinds,
148	! old module precision_kind is removed,
149	! revision history before 2012 removed,
150	! comment fields (!:) to be used for variable explanations added to
151	! all variable declaration statements
152	! 1318 2014-03-17 13:35:16Z raasch
153	! module interfaces removed
154	!
155	! 1308 2014-03-13 14:58:42Z fricke
156	! +netcdf_data_format_save
157	! For masked data, parallel netcdf output is not tested so far, hence
158	! netcdf_data_format is switched back to non-paralell output.
159	!
160	! 1276 2014-01-15 13:40:41Z heinze
161	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
162	!
163	! 1257 2013-11-08 15:18:40Z raasch
164	! acc-update-host directive for timestep removed
165	!
166	! 1241 2013-10-30 11:36:58Z heinze
167	! Generalize calc_mean_profile for wider use
168	! Determine shf and qsws in dependence on data from LSF_DATA
169	! Determine ug and vg in dependence on data from LSF_DATA
170	! 1221 2013-09-10 08:59:13Z raasch
171	! host update of arrays before timestep is called
172	!
173	! 1179 2013-06-14 05:57:58Z raasch
174	! mean profiles for reference state are only calculated if required,
175	! small bugfix for background communication
176	!
177	! 1171 2013-05-30 11:27:45Z raasch
178	! split of prognostic_equations deactivated (comment lines), for the time being
179	!
180	! 1128 2013-04-12 06:19:32Z raasch
181	! asynchronous transfer of ghost point data realized for acc-optimized version:
182	! prognostic_equations are first called two times for those points required for
183	! the left-right and north-south exchange, respectively, and then for the
184	! remaining points,
185	! those parts requiring global communication moved from prognostic_equations to
186	! here
187	!
188	! 1115 2013-03-26 18:16:16Z hoffmann
189	! calculation of qr and nr is restricted to precipitation
190	!
191	! 1113 2013-03-10 02:48:14Z raasch
192	! GPU-porting of boundary conditions,
193	! openACC directives updated
194	! formal parameter removed from routine boundary_conds
195	!
196	! 1111 2013-03-08 23:54:10Z raasch
197	! +internal timestep counter for cpu statistics added,
198	! openACC directives updated
199	!
200	! 1092 2013-02-02 11:24:22Z raasch
201	! unused variables removed
202	!
203	! 1065 2012-11-22 17:42:36Z hoffmann
204	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
205	!
206	! 1053 2012-11-13 17:11:03Z hoffmann
207	! exchange of ghost points for nr, qr added
208	!
209	! 1036 2012-10-22 13:43:42Z raasch
210	! code put under GPL (PALM 3.9)
211	!
212	! 1019 2012-09-28 06:46:45Z raasch
213	! non-optimized version of prognostic_equations removed
214	!
215	! 1015 2012-09-27 09:23:24Z raasch
216	! +call of prognostic_equations_acc
217	!
218	! 1001 2012-09-13 14:08:46Z raasch
219	! all actions concerning leapfrog- and upstream-spline-scheme removed
220	!
221	! 849 2012-03-15 10:35:09Z raasch
222	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
223	!
224	! 825 2012-02-19 03:03:44Z raasch
225	! wang_collision_kernel renamed wang_kernel
226	!
227	! Revision 1.1 1997/08/11 06:19:04 raasch
228	! Initial revision
229	!
230	!
231	! Description:
232	! ------------
233	!> Integration in time of the model equations, statistical analysis and graphic
234	!> output
235	!------------------------------------------------------------------------------!
236	SUBROUTINE time_integration
237
238
239	USE advec_ws, &
240	ONLY: ws_statistics
241
242	USE arrays_3d, &
243	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
244	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, s, s_p, sa_p, &
245	tend, u, u_p, v, vpt, v_p, w, w_p
246
247	USE calc_mean_profile_mod, &
248	ONLY: calc_mean_profile
249
250	USE control_parameters, &
251	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
252	averaging_interval, averaging_interval_pr, &
253	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
254	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
255	cloud_physics, constant_flux_layer, constant_heatflux, &
256	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
257	coupling_start_time, current_timestep_number, &
258	disturbance_created, disturbance_energy_limit, dist_range, &
259	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
260	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
261	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
262	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
263	end_time, first_call_lpm, galilei_transformation, humidity, &
264	intermediate_timestep_count, &
265	intermediate_timestep_count_max, large_scale_forcing, &
266	loop_optimization, lsf_surf, lsf_vert, masks, &
267	microphysics_seifert, mid, nest_domain, &
268	neutral, nr_timesteps_this_run, nudging, &
269	ocean, on_device, passive_scalar, &
270	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
271	run_coupled, simulated_time, simulated_time_chr, &
272	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
273	skip_time_do3d, skip_time_domask, skip_time_dopr, &
274	skip_time_data_output_av, sloping_surface, &
275	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
276	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
277	time_do3d, time_domask, time_dopr, time_dopr_av, &
278	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
279	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
280	time_run_control, time_since_reference_point, &
281	turbulent_inflow, urban_surface, &
282	use_initial_profile_as_reference, &
283	use_single_reference_value, u_gtrans, v_gtrans, virtual_flight, &
284	ws_scheme_mom, ws_scheme_sca
285
286	USE cpulog, &
287	ONLY: cpu_log, log_point, log_point_s
288
289	USE flight_mod, &
290	ONLY: flight_measurement
291
292
293	USE indices, &
294	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
295	nxrg, nyn, nyng, nys, nysg, nzb, nzt, nzb_u_inner, nzb_v_inner
296
297	USE interaction_droplets_ptq_mod, &
298	ONLY: interaction_droplets_ptq
299
300	USE interfaces
301
302	USE kinds
303
304	USE land_surface_model_mod, &
305	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
306	skip_time_do_lsm
307
308	USE ls_forcing_mod, &
309	ONLY: ls_forcing_surf, ls_forcing_vert
310
311	USE microphysics_mod, &
312	ONLY: collision_turbulence
313
314	USE nudge_mod, &
315	ONLY: calc_tnudge, nudge_ref
316
317	USE particle_attributes, &
318	ONLY: particle_advection, particle_advection_start, &
319	use_sgs_for_particles, wang_kernel
320
321	USE pegrid
322
323	USE pmc_interface, &
324	ONLY: nested_run, nesting_mode, pmci_datatrans, &
325	pmci_ensure_nest_mass_conservation, pmci_synchronize
326
327	USE production_e_mod, &
328	ONLY: production_e_init
329
330	USE progress_bar, &
331	ONLY: finish_progress_bar, output_progress_bar
332
333	USE prognostic_equations_mod, &
334	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
335	prognostic_equations_vector
336
337	USE radiation_model_mod, &
338	ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
339	skip_time_do_radiation, time_radiation
340
341	USE spectra_mod, &
342	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
343	skip_time_dosp
344
345	USE statistics, &
346	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l, u_max, &
347	u_max_ijk, v_max, v_max_ijk, w_max, w_max_ijk
348
349	USE surface_layer_fluxes_mod, &
350	ONLY: surface_layer_fluxes
351
352	USE urban_surface_mod, &
353	ONLY: usm_material_heat_model, usm_material_model, &
354	usm_radiation, usm_surface_energy_balance
355
356	USE user_actions_mod, &
357	ONLY: user_actions
358
359	USE wind_turbine_model_mod, &
360	ONLY: wind_turbine, wtm_forces
361
362	IMPLICIT NONE
363
364	CHARACTER (LEN=9) :: time_to_string !<
365
366	REAL(wp) :: dt_3d_old !< temporary storage of timestep to be used for
367	!< steering of run control output interval
368
369	!
370	!-- At beginning determine the first time step
371	CALL timestep
372
373	!
374	!-- Synchronize the timestep in case of nested run.
375	IF ( nested_run ) THEN
376	!
377	!-- Synchronization by unifying the time step.
378	!-- Global minimum of all time-steps is used for all.
379	CALL pmci_synchronize
380	ENDIF
381
382	!
383	!-- Determine and print out the run control quantities before the first time
384	!-- step of this run. For the initial run, some statistics (e.g. divergence)
385	!-- need to be determined first.
386	IF ( simulated_time == 0.0_wp ) CALL flow_statistics
387	CALL run_control
388
389	!
390	!-- Data exchange between coupled models in case that a call has been omitted
391	!-- at the end of the previous run of a job chain.
392	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
393	!
394	!-- In case of model termination initiated by the local model the coupler
395	!-- must not be called because this would again cause an MPI hang.
396	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
397	CALL surface_coupler
398	time_coupling = time_coupling - dt_coupling
399	ENDDO
400	IF (time_coupling == 0.0_wp .AND. &
401	time_since_reference_point < dt_coupling ) &
402	THEN
403	time_coupling = time_since_reference_point
404	ENDIF
405	ENDIF
406
407	#if defined( __dvrp_graphics )
408	!
409	!-- Time measurement with dvrp software
410	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
411	#endif
412
413	CALL location_message( 'start with time-stepping', .TRUE. )
414	!
415	!-- Start of the time loop
416	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
417	.NOT. terminate_run )
418
419	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
420
421	!
422	!-- Determine ug, vg and w_subs in dependence on data from external file
423	!-- LSF_DATA
424	IF ( large_scale_forcing .AND. lsf_vert ) THEN
425	CALL ls_forcing_vert ( simulated_time )
426	sums_ls_l = 0.0_wp
427	ENDIF
428
429	!
430	!-- Set pt_init and q_init to the current profiles taken from
431	!-- NUDGING_DATA
432	IF ( nudging ) THEN
433	CALL nudge_ref ( simulated_time )
434	!
435	!-- Store temperature gradient at the top boundary for possible Neumann
436	!-- boundary condition
437	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
438	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
439	ENDIF
440
441	!
442	!-- Execute the user-defined actions
443	CALL user_actions( 'before_timestep' )
444
445	!
446	!-- Calculate forces by wind turbines
447	IF ( wind_turbine ) THEN
448
449	CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
450
451	CALL wtm_forces
452
453	CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
454
455	ENDIF
456
457	!
458	!-- Start of intermediate step loop
459	intermediate_timestep_count = 0
460	DO WHILE ( intermediate_timestep_count < &
461	intermediate_timestep_count_max )
462
463	intermediate_timestep_count = intermediate_timestep_count + 1
464
465	!
466	!-- Set the steering factors for the prognostic equations which depend
467	!-- on the timestep scheme
468	CALL timestep_scheme_steering
469
470	!
471	!-- Calculate those variables needed in the tendency terms which need
472	!-- global communication
473	IF ( .NOT. use_single_reference_value .AND. &
474	.NOT. use_initial_profile_as_reference ) THEN
475	!
476	!-- Horizontally averaged profiles to be used as reference state in
477	!-- buoyancy terms (WARNING: only the respective last call of
478	!-- calc_mean_profile defines the reference state!)
479	IF ( .NOT. neutral ) THEN
480	CALL calc_mean_profile( pt, 4 )
481	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
482	ENDIF
483	IF ( ocean ) THEN
484	CALL calc_mean_profile( rho, 64 )
485	ref_state(:) = hom(:,1,64,0)
486	ENDIF
487	IF ( humidity ) THEN
488	CALL calc_mean_profile( vpt, 44 )
489	ref_state(:) = hom(:,1,44,0)
490	ENDIF
491
492	ENDIF
493
494	IF ( .NOT. constant_diffusion ) CALL production_e_init
495	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
496	intermediate_timestep_count == 1 ) CALL ws_statistics
497	!
498	!-- In case of nudging calculate current nudging time scale and horizontal
499	!-- means of u, v, pt and q
500	IF ( nudging ) THEN
501	CALL calc_tnudge( simulated_time )
502	CALL calc_mean_profile( u, 1 )
503	CALL calc_mean_profile( v, 2 )
504	CALL calc_mean_profile( pt, 4 )
505	CALL calc_mean_profile( q, 41 )
506	ENDIF
507
508	!
509	!-- Solve the prognostic equations. A fast cache optimized version with
510	!-- only one single loop is used in case of Piascek-Williams advection
511	!-- scheme. NEC vector machines use a different version, because
512	!-- in the other versions a good vectorization is prohibited due to
513	!-- inlining problems.
514	IF ( loop_optimization == 'cache' ) THEN
515	CALL prognostic_equations_cache
516	ELSEIF ( loop_optimization == 'vector' ) THEN
517	CALL prognostic_equations_vector
518	ELSEIF ( loop_optimization == 'acc' ) THEN
519	i_left = nxl; i_right = nxr
520	j_south = nys; j_north = nyn
521	CALL prognostic_equations_acc
522
523	! i_left = nxl; i_right = nxl+nbgp-1
524	! j_south = nys; j_north = nyn
525	! CALL prognostic_equations_acc
526	! i_left = nxr-nbgp+1; i_right = nxr
527	! j_south = nys; j_north = nyn
528	! CALL prognostic_equations_acc
529
530	!
531	!-- Exchange of ghost points (lateral boundary conditions)
532	IF ( background_communication ) THEN
533
534	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
535
536	send_receive = 'lr'
537	sendrecv_in_background = .TRUE.
538	req = 0
539	req_count = 0
540
541	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
542	on_device = .TRUE. ! to be removed after complete porting
543	ELSE ! of ghost point exchange
544	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
545	ENDIF
546
547	CALL exchange_horiz( u_p, nbgp )
548	CALL exchange_horiz( v_p, nbgp )
549	CALL exchange_horiz( w_p, nbgp )
550	CALL exchange_horiz( pt_p, nbgp )
551	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
552	IF ( ocean ) THEN
553	CALL exchange_horiz( sa_p, nbgp )
554	CALL exchange_horiz( rho, nbgp )
555	CALL exchange_horiz( prho, nbgp )
556	ENDIF
557	IF ( humidity ) THEN
558	CALL exchange_horiz( q_p, nbgp )
559	IF ( cloud_physics .AND. microphysics_seifert ) THEN
560	CALL exchange_horiz( qr_p, nbgp )
561	CALL exchange_horiz( nr_p, nbgp )
562	ENDIF
563	ENDIF
564	IF ( cloud_droplets ) THEN
565	CALL exchange_horiz( ql, nbgp )
566	CALL exchange_horiz( ql_c, nbgp )
567	CALL exchange_horiz( ql_v, nbgp )
568	CALL exchange_horiz( ql_vp, nbgp )
569	ENDIF
570	IF ( wang_kernel .OR. collision_turbulence .OR. &
571	use_sgs_for_particles ) THEN
572	CALL exchange_horiz( diss, nbgp )
573	ENDIF
574	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
575
576	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
577	on_device = .FALSE. ! to be removed after complete porting
578	ELSE ! of ghost point exchange
579	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
580	ENDIF
581
582	sendrecv_in_background = .FALSE.
583
584	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
585
586	ENDIF
587
588	! i_left = nxl+nbgp; i_right = nxr-nbgp
589	! j_south = nys; j_north = nys+nbgp-1
590	! CALL prognostic_equations_acc
591	! i_left = nxl+nbgp; i_right = nxr-nbgp
592	! j_south = nyn-nbgp+1; j_north = nyn
593	! CALL prognostic_equations_acc
594
595	IF ( background_communication ) THEN
596	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
597	#if defined( __parallel )
598	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
599	#endif
600	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
601
602	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
603
604	send_receive = 'ns'
605	sendrecv_in_background = .TRUE.
606	req = 0
607	req_count = 0
608
609	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
610	on_device = .TRUE. ! to be removed after complete porting
611	ELSE ! of ghost point exchange
612	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
613	ENDIF
614
615	CALL exchange_horiz( u_p, nbgp )
616	CALL exchange_horiz( v_p, nbgp )
617	CALL exchange_horiz( w_p, nbgp )
618	CALL exchange_horiz( pt_p, nbgp )
619	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
620	IF ( ocean ) THEN
621	CALL exchange_horiz( sa_p, nbgp )
622	CALL exchange_horiz( rho, nbgp )
623	CALL exchange_horiz( prho, nbgp )
624	ENDIF
625	IF ( humidity ) THEN
626	CALL exchange_horiz( q_p, nbgp )
627	IF ( cloud_physics .AND. microphysics_seifert ) THEN
628	CALL exchange_horiz( qr_p, nbgp )
629	CALL exchange_horiz( nr_p, nbgp )
630	ENDIF
631	ENDIF
632	IF ( cloud_droplets ) THEN
633	CALL exchange_horiz( ql, nbgp )
634	CALL exchange_horiz( ql_c, nbgp )
635	CALL exchange_horiz( ql_v, nbgp )
636	CALL exchange_horiz( ql_vp, nbgp )
637	ENDIF
638	IF ( wang_kernel .OR. collision_turbulence .OR. &
639	use_sgs_for_particles ) THEN
640	CALL exchange_horiz( diss, nbgp )
641	ENDIF
642	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
643
644	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
645	on_device = .FALSE. ! to be removed after complete porting
646	ELSE ! of ghost point exchange
647	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
648	ENDIF
649
650	sendrecv_in_background = .FALSE.
651
652	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
653
654	ENDIF
655
656	! i_left = nxl+nbgp; i_right = nxr-nbgp
657	! j_south = nys+nbgp; j_north = nyn-nbgp
658	! CALL prognostic_equations_acc
659
660	IF ( background_communication ) THEN
661	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
662	#if defined( __parallel )
663	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
664	#endif
665	send_receive = 'al'
666	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
667	ENDIF
668
669	ENDIF
670
671	!
672	!-- Particle transport/physics with the Lagrangian particle model
673	!-- (only once during intermediate steps, because it uses an Euler-step)
674	!-- ### particle model should be moved before prognostic_equations, in order
675	!-- to regard droplet interactions directly
676	IF ( particle_advection .AND. &
677	simulated_time >= particle_advection_start .AND. &
678	intermediate_timestep_count == 1 ) THEN
679	CALL lpm
680	first_call_lpm = .FALSE.
681	ENDIF
682
683	!
684	!-- Interaction of droplets with temperature and specific humidity.
685	!-- Droplet condensation and evaporation is calculated within
686	!-- advec_particles.
687	IF ( cloud_droplets .AND. &
688	intermediate_timestep_count == intermediate_timestep_count_max )&
689	THEN
690	CALL interaction_droplets_ptq
691	ENDIF
692
693	!
694	!-- Exchange of ghost points (lateral boundary conditions)
695	IF ( .NOT. background_communication ) THEN
696
697	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
698
699	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
700	on_device = .TRUE. ! to be removed after complete porting
701	ELSE ! of ghost point exchange
702	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
703	ENDIF
704
705	CALL exchange_horiz( u_p, nbgp )
706	CALL exchange_horiz( v_p, nbgp )
707	CALL exchange_horiz( w_p, nbgp )
708	CALL exchange_horiz( pt_p, nbgp )
709	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
710	IF ( ocean ) THEN
711	CALL exchange_horiz( sa_p, nbgp )
712	CALL exchange_horiz( rho, nbgp )
713	CALL exchange_horiz( prho, nbgp )
714	ENDIF
715	IF ( humidity ) THEN
716	CALL exchange_horiz( q_p, nbgp )
717	IF ( cloud_physics .AND. microphysics_seifert ) THEN
718	CALL exchange_horiz( qr_p, nbgp )
719	CALL exchange_horiz( nr_p, nbgp )
720	ENDIF
721	ENDIF
722	IF ( cloud_droplets ) THEN
723	CALL exchange_horiz( ql, nbgp )
724	CALL exchange_horiz( ql_c, nbgp )
725	CALL exchange_horiz( ql_v, nbgp )
726	CALL exchange_horiz( ql_vp, nbgp )
727	ENDIF
728	IF ( wang_kernel .OR. collision_turbulence .OR. &
729	use_sgs_for_particles ) THEN
730	CALL exchange_horiz( diss, nbgp )
731	ENDIF
732	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
733
734	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
735	on_device = .FALSE. ! to be removed after complete porting
736	ELSE ! of ghost point exchange
737	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
738	ENDIF
739
740	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
741
742	ENDIF
743
744	!
745	!-- Boundary conditions for the prognostic quantities (except of the
746	!-- velocities at the outflow in case of a non-cyclic lateral wall)
747	CALL boundary_conds
748
749	!
750	!-- Swap the time levels in preparation for the next time step.
751	CALL swap_timelevel
752
753	IF ( nested_run ) THEN
754
755	CALL cpu_log( log_point(60), 'nesting', 'start' )
756	!
757	!-- Domain nesting. The data transfer subroutines pmci_parent_datatrans
758	!-- and pmci_child_datatrans are called inside the wrapper
759	!-- subroutine pmci_datatrans according to the control parameters
760	!-- nesting_mode and nesting_datatransfer_mode.
761	!-- TO_DO: why is nesting_mode given as a parameter here?
762	CALL pmci_datatrans( nesting_mode )
763
764	IF ( TRIM( nesting_mode ) == 'two-way' .OR. &
765	nesting_mode == 'vertical' ) THEN
766	!
767	!-- Exchange_horiz is needed for all parent-domains after the
768	!-- anterpolation
769	CALL exchange_horiz( u, nbgp )
770	CALL exchange_horiz( v, nbgp )
771	CALL exchange_horiz( w, nbgp )
772	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
773	IF ( humidity ) CALL exchange_horiz( q, nbgp )
774	IF ( passive_scalar ) CALL exchange_horiz( s, nbgp )
775	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
776	ENDIF
777	!
778	!-- Correct the w top-BC in nest domains to ensure mass conservation.
779	!-- This action must never be done for the root domain. Vertical
780	!-- nesting implies mass conservation.
781	IF ( nest_domain ) THEN
782	CALL pmci_ensure_nest_mass_conservation
783	ENDIF
784
785	CALL cpu_log( log_point(60), 'nesting', 'stop' )
786
787	ENDIF
788
789	!
790	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
791	!-- when a sloping surface is used
792	IF ( sloping_surface ) THEN
793	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
794	pt_slope_offset
795	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
796	pt_slope_offset
797	ENDIF
798
799	!
800	!-- Impose a turbulent inflow using the recycling method
801	IF ( turbulent_inflow ) CALL inflow_turbulence
802
803	!
804	!-- Impose a random perturbation on the horizontal velocity field
805	IF ( create_disturbances .AND. &
806	( call_psolver_at_all_substeps .AND. &
807	intermediate_timestep_count == intermediate_timestep_count_max )&
808	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
809	intermediate_timestep_count == 1 ) ) &
810	THEN
811	time_disturb = time_disturb + dt_3d
812	IF ( time_disturb >= dt_disturb ) THEN
813	!$acc update host( u, v )
814	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
815	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
816	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
817	CALL disturb_field( nzb_u_inner, tend, u )
818	CALL disturb_field( nzb_v_inner, tend, v )
819	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
820	!
821	!-- Runs with a non-cyclic lateral wall need perturbations
822	!-- near the inflow throughout the whole simulation
823	dist_range = 1
824	CALL disturb_field( nzb_u_inner, tend, u )
825	CALL disturb_field( nzb_v_inner, tend, v )
826	dist_range = 0
827	ENDIF
828	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
829	!$acc update device( u, v )
830	time_disturb = time_disturb - dt_disturb
831	ENDIF
832	ENDIF
833
834	!
835	!-- Reduce the velocity divergence via the equation for perturbation
836	!-- pressure.
837	IF ( intermediate_timestep_count == 1 .OR. &
838	call_psolver_at_all_substeps ) THEN
839	CALL pres
840	ENDIF
841
842	!
843	!-- If required, compute liquid water content
844	IF ( cloud_physics ) THEN
845	CALL calc_liquid_water_content
846	!$acc update device( ql )
847	ENDIF
848	!
849	!-- If required, compute virtual potential temperature
850	IF ( humidity ) THEN
851	CALL compute_vpt
852	!$acc update device( vpt )
853	ENDIF
854
855	!
856	!-- Compute the diffusion quantities
857	IF ( .NOT. constant_diffusion ) THEN
858
859	!
860	!-- Determine surface fluxes shf and qsws and surface values
861	!-- pt_surface and q_surface in dependence on data from external
862	!-- file LSF_DATA respectively
863	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
864	intermediate_timestep_count == intermediate_timestep_count_max )&
865	THEN
866	CALL ls_forcing_surf ( simulated_time )
867	ENDIF
868
869	!
870	!-- First the vertical fluxes in the surface (constant flux) layer are computed
871	IF ( constant_flux_layer ) THEN
872	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
873	CALL surface_layer_fluxes
874	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
875	ENDIF
876
877	!
878	!-- If required, solve the energy balance for the surface and run soil
879	!-- model
880	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
881
882	CALL cpu_log( log_point(54), 'land_surface', 'start' )
883	CALL lsm_energy_balance
884	CALL lsm_soil_model
885	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
886	ENDIF
887
888	!
889	!-- If required, solve the energy balance for urban surfaces and run
890	!-- the material heat model
891	IF (urban_surface) THEN
892	CALL cpu_log( log_point(74), 'urban_surface', 'start' )
893	CALL usm_surface_energy_balance
894	IF ( usm_material_model ) THEN
895	CALL usm_material_heat_model
896	ENDIF
897	CALL cpu_log( log_point(74), 'urban_surface', 'stop' )
898	ENDIF
899
900	!
901	!-- Compute the diffusion coefficients
902	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
903	IF ( .NOT. humidity ) THEN
904	IF ( ocean ) THEN
905	CALL diffusivities( prho, prho_reference )
906	ELSE
907	CALL diffusivities( pt, pt_reference )
908	ENDIF
909	ELSE
910	CALL diffusivities( vpt, pt_reference )
911	ENDIF
912	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
913
914	ENDIF
915
916	!
917	!-- If required, calculate radiative fluxes and heating rates
918	IF ( radiation .AND. intermediate_timestep_count &
919	== intermediate_timestep_count_max .AND. simulated_time > &
920	skip_time_do_radiation ) THEN
921
922	time_radiation = time_radiation + dt_3d
923
924	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
925	THEN
926
927	CALL cpu_log( log_point(50), 'radiation', 'start' )
928
929	IF ( .NOT. force_radiation_call ) THEN
930	time_radiation = time_radiation - dt_radiation
931	ENDIF
932
933	CALL radiation_control
934
935	CALL cpu_log( log_point(50), 'radiation', 'stop' )
936
937	IF (urban_surface) THEN
938	CALL cpu_log( log_point(75), 'usm_radiation', 'start' )
939	CALL usm_radiation
940	CALL cpu_log( log_point(75), 'usm_radiation', 'stop' )
941	ENDIF
942
943	ENDIF
944	ENDIF
945
946	ENDDO ! Intermediate step loop
947
948	!
949	!-- Increase simulation time and output times
950	nr_timesteps_this_run = nr_timesteps_this_run + 1
951	current_timestep_number = current_timestep_number + 1
952	simulated_time = simulated_time + dt_3d
953	simulated_time_chr = time_to_string( simulated_time )
954	time_since_reference_point = simulated_time - coupling_start_time
955
956
957
958	IF ( simulated_time >= skip_time_data_output_av ) THEN
959	time_do_av = time_do_av + dt_3d
960	ENDIF
961	IF ( simulated_time >= skip_time_do2d_xy ) THEN
962	time_do2d_xy = time_do2d_xy + dt_3d
963	ENDIF
964	IF ( simulated_time >= skip_time_do2d_xz ) THEN
965	time_do2d_xz = time_do2d_xz + dt_3d
966	ENDIF
967	IF ( simulated_time >= skip_time_do2d_yz ) THEN
968	time_do2d_yz = time_do2d_yz + dt_3d
969	ENDIF
970	IF ( simulated_time >= skip_time_do3d ) THEN
971	time_do3d = time_do3d + dt_3d
972	ENDIF
973	DO mid = 1, masks
974	IF ( simulated_time >= skip_time_domask(mid) ) THEN
975	time_domask(mid)= time_domask(mid) + dt_3d
976	ENDIF
977	ENDDO
978	time_dvrp = time_dvrp + dt_3d
979	IF ( simulated_time >= skip_time_dosp ) THEN
980	time_dosp = time_dosp + dt_3d
981	ENDIF
982	time_dots = time_dots + dt_3d
983	IF ( .NOT. first_call_lpm ) THEN
984	time_dopts = time_dopts + dt_3d
985	ENDIF
986	IF ( simulated_time >= skip_time_dopr ) THEN
987	time_dopr = time_dopr + dt_3d
988	ENDIF
989	time_dopr_listing = time_dopr_listing + dt_3d
990	time_run_control = time_run_control + dt_3d
991
992	!
993	!-- Data exchange between coupled models
994	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
995	time_coupling = time_coupling + dt_3d
996
997	!
998	!-- In case of model termination initiated by the local model
999	!-- (terminate_coupled > 0), the coupler must be skipped because it would
1000	!-- cause an MPI intercomminucation hang.
1001	!-- If necessary, the coupler will be called at the beginning of the
1002	!-- next restart run.
1003	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
1004	CALL surface_coupler
1005	time_coupling = time_coupling - dt_coupling
1006	ENDDO
1007	ENDIF
1008
1009	!
1010	!-- Execute user-defined actions
1011	CALL user_actions( 'after_integration' )
1012
1013	!
1014	!-- If Galilei transformation is used, determine the distance that the
1015	!-- model has moved so far
1016	IF ( galilei_transformation ) THEN
1017	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
1018	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
1019	ENDIF
1020
1021	!
1022	!-- Check, if restart is necessary (because cpu-time is expiring or
1023	!-- because it is forced by user) and set stop flag
1024	!-- This call is skipped if the remote model has already initiated a restart.
1025	IF ( .NOT. terminate_run ) CALL check_for_restart
1026
1027	!
1028	!-- Carry out statistical analysis and output at the requested output times.
1029	!-- The MOD function is used for calculating the output time counters (like
1030	!-- time_dopr) in order to regard a possible decrease of the output time
1031	!-- interval in case of restart runs
1032
1033	!
1034	!-- Set a flag indicating that so far no statistics have been created
1035	!-- for this time step
1036	flow_statistics_called = .FALSE.
1037
1038	!
1039	!-- If required, call flow_statistics for averaging in time
1040	IF ( averaging_interval_pr /= 0.0_wp .AND. &
1041	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
1042	simulated_time >= skip_time_dopr ) THEN
1043	time_dopr_av = time_dopr_av + dt_3d
1044	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
1045	do_sum = .TRUE.
1046	time_dopr_av = MOD( time_dopr_av, &
1047	MAX( dt_averaging_input_pr, dt_3d ) )
1048	ENDIF
1049	ENDIF
1050	IF ( do_sum ) CALL flow_statistics
1051
1052	!
1053	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1054	IF ( averaging_interval /= 0.0_wp .AND. &
1055	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1056	simulated_time >= skip_time_data_output_av ) &
1057	THEN
1058	time_do_sla = time_do_sla + dt_3d
1059	IF ( time_do_sla >= dt_averaging_input ) THEN
1060	CALL sum_up_3d_data
1061	average_count_3d = average_count_3d + 1
1062	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1063	ENDIF
1064	ENDIF
1065
1066	!
1067	!-- Calculate spectra for time averaging
1068	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1069	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1070	simulated_time >= skip_time_dosp ) THEN
1071	time_dosp_av = time_dosp_av + dt_3d
1072	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1073	CALL calc_spectra
1074	time_dosp_av = MOD( time_dosp_av, &
1075	MAX( dt_averaging_input_pr, dt_3d ) )
1076	ENDIF
1077	ENDIF
1078
1079	!
1080	!-- Call flight module and output data
1081	IF ( virtual_flight ) THEN
1082	CALL flight_measurement
1083	CALL data_output_flight
1084	ENDIF
1085
1086	!
1087	!-- Profile output (ASCII) on file
1088	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1089	CALL print_1d
1090	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1091	dt_3d ) )
1092	ENDIF
1093
1094	!
1095	!-- Graphic output for PROFIL
1096	IF ( time_dopr >= dt_dopr ) THEN
1097	IF ( dopr_n /= 0 ) CALL data_output_profiles
1098	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1099	time_dopr_av = 0.0_wp ! due to averaging (see above)
1100	ENDIF
1101
1102	!
1103	!-- Graphic output for time series
1104	IF ( time_dots >= dt_dots ) THEN
1105	CALL data_output_tseries
1106	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1107	ENDIF
1108
1109	!
1110	!-- Output of spectra (formatted for use with PROFIL), in case of no
1111	!-- time averaging, spectra has to be calculated before
1112	IF ( time_dosp >= dt_dosp ) THEN
1113	IF ( average_count_sp == 0 ) CALL calc_spectra
1114	CALL data_output_spectra
1115	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1116	ENDIF
1117
1118	!
1119	!-- 2d-data output (cross-sections)
1120	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1121	CALL data_output_2d( 'xy', 0 )
1122	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1123	ENDIF
1124	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1125	CALL data_output_2d( 'xz', 0 )
1126	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1127	ENDIF
1128	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1129	CALL data_output_2d( 'yz', 0 )
1130	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1131	ENDIF
1132
1133	!
1134	!-- 3d-data output (volume data)
1135	IF ( time_do3d >= dt_do3d ) THEN
1136	CALL data_output_3d( 0 )
1137	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1138	ENDIF
1139
1140	!
1141	!-- Masked data output
1142	DO mid = 1, masks
1143	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1144	CALL data_output_mask( 0 )
1145	time_domask(mid) = MOD( time_domask(mid), &
1146	MAX( dt_domask(mid), dt_3d ) )
1147	ENDIF
1148	ENDDO
1149
1150	!
1151	!-- Output of time-averaged 2d/3d/masked data
1152	IF ( time_do_av >= dt_data_output_av ) THEN
1153	CALL average_3d_data
1154	CALL data_output_2d( 'xy', 1 )
1155	CALL data_output_2d( 'xz', 1 )
1156	CALL data_output_2d( 'yz', 1 )
1157	CALL data_output_3d( 1 )
1158	DO mid = 1, masks
1159	CALL data_output_mask( 1 )
1160	ENDDO
1161	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1162	ENDIF
1163
1164	!
1165	!-- Output of particle time series
1166	IF ( particle_advection ) THEN
1167	IF ( time_dopts >= dt_dopts .OR. &
1168	( simulated_time >= particle_advection_start .AND. &
1169	first_call_lpm ) ) THEN
1170	CALL data_output_ptseries
1171	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1172	ENDIF
1173	ENDIF
1174
1175	!
1176	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1177	#if defined( __dvrp_graphics )
1178	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1179	#endif
1180	IF ( time_dvrp >= dt_dvrp ) THEN
1181	CALL data_output_dvrp
1182	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1183	ENDIF
1184	#if defined( __dvrp_graphics )
1185	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1186	#endif
1187
1188	!
1189	!-- If required, set the heat flux for the next time step at a random value
1190	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1191
1192	!
1193	!-- Execute user-defined actions
1194	CALL user_actions( 'after_timestep' )
1195
1196	!
1197	!-- Determine size of next time step. Save timestep dt_3d because it is
1198	!-- newly calculated in routine timestep, but required further below for
1199	!-- steering the run control output interval
1200	dt_3d_old = dt_3d
1201	CALL timestep
1202
1203	!
1204	!-- Synchronize the timestep in case of nested run.
1205	IF ( nested_run ) THEN
1206	!
1207	!-- Synchronize by unifying the time step.
1208	!-- Global minimum of all time-steps is used for all.
1209	CALL pmci_synchronize
1210	ENDIF
1211
1212	!
1213	!-- Computation and output of run control parameters.
1214	!-- This is also done whenever perturbations have been imposed
1215	IF ( time_run_control >= dt_run_control .OR. &
1216	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1217	THEN
1218	CALL run_control
1219	IF ( time_run_control >= dt_run_control ) THEN
1220	time_run_control = MOD( time_run_control, &
1221	MAX( dt_run_control, dt_3d_old ) )
1222	ENDIF
1223	ENDIF
1224
1225	!
1226	!-- Output elapsed simulated time in form of a progress bar on stdout
1227	IF ( myid == 0 ) CALL output_progress_bar
1228
1229	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1230
1231
1232	ENDDO ! time loop
1233
1234	IF ( myid == 0 ) CALL finish_progress_bar
1235
1236	#if defined( __dvrp_graphics )
1237	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1238	#endif
1239
1240	CALL location_message( 'finished time-stepping', .TRUE. )
1241
1242	END SUBROUTINE time_integration

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