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source: palm/trunk/SOURCE/time_integration.f90 @ 2034

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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 2032 2016-10-21 15:13:51Z gronemeier $
27	!
28	! 2031 2016-10-21 15:11:58Z knoop
29	! renamed variable rho to rho_ocean
30	!
31	! 2011 2016-09-19 17:29:57Z kanani
32	! Flag urban_surface is now defined in module control_parameters,
33	! removed commented CALLs of global_min_max.
34	!
35	! 2007 2016-08-24 15:47:17Z kanani
36	! Added CALLs for new urban surface model
37	!
38	! 2000 2016-08-20 18:09:15Z knoop
39	! Forced header and separation lines into 80 columns
40	!
41	! 1976 2016-07-27 13:28:04Z maronga
42	! Simplified calls to radiation model
43	!
44	! 1960 2016-07-12 16:34:24Z suehring
45	! Separate humidity and passive scalar
46	!
47	! 1957 2016-07-07 10:43:48Z suehring
48	! flight module added
49	!
50	! 1919 2016-05-27 14:51:23Z raasch
51	! Initial version of purely vertical nesting introduced.
52	!
53	! 1918 2016-05-27 14:35:57Z raasch
54	! determination of time step moved to the end of the time step loop,
55	! the first time step is now always calculated before the time step loop (i.e.
56	! also in case of restart runs)
57	!
58	! 1914 2016-05-26 14:44:07Z witha
59	! Added call for wind turbine model
60	!
61	! 1878 2016-04-19 12:30:36Z hellstea
62	! Synchronization for nested runs rewritten
63	!
64	! 1853 2016-04-11 09:00:35Z maronga
65	! Adjusted for use with radiation_scheme = constant
66	!
67	! 1849 2016-04-08 11:33:18Z hoffmann
68	! Adapted for modularization of microphysics
69	!
70	! 1833 2016-04-07 14:23:03Z raasch
71	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
72	!
73	! 1831 2016-04-07 13:15:51Z hoffmann
74	! turbulence renamed collision_turbulence
75	!
76	! 1822 2016-04-07 07:49:42Z hoffmann
77	! icloud_scheme replaced by microphysics_*
78	!
79	! 1808 2016-04-05 19:44:00Z raasch
80	! output message in case unscheduled radiation calls removed
81	!
82	! 1797 2016-03-21 16:50:28Z raasch
83	! introduction of different datatransfer modes
84	!
85	! 1791 2016-03-11 10:41:25Z raasch
86	! call of pmci_update_new removed
87	!
88	! 1786 2016-03-08 05:49:27Z raasch
89	! +module spectrum
90	!
91	! 1783 2016-03-06 18:36:17Z raasch
92	! switch back of netcdf data format for mask output moved to the mask output
93	! routine
94	!
95	! 1781 2016-03-03 15:12:23Z raasch
96	! some pmc calls removed at the beginning (before timeloop),
97	! pmc initialization moved to the main program
98	!
99	! 1764 2016-02-28 12:45:19Z raasch
100	! PMC_ACTIVE flags removed,
101	! bugfix: nest synchronization after first call of timestep
102	!
103	! 1762 2016-02-25 12:31:13Z hellstea
104	! Introduction of nested domain feature
105	!
106	! 1736 2015-12-04 08:56:33Z raasch
107	! no perturbations added to total domain if energy limit has been set zero
108	!
109	! 1691 2015-10-26 16:17:44Z maronga
110	! Added option for spin-ups without land surface and radiation models. Moved calls
111	! for radiation and lan surface schemes.
112	!
113	! 1682 2015-10-07 23:56:08Z knoop
114	! Code annotations made doxygen readable
115	!
116	! 1671 2015-09-25 03:29:37Z raasch
117	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
118	! for particles
119	!
120	! 1585 2015-04-30 07:05:52Z maronga
121	! Moved call of radiation scheme. Added support for RRTM
122	!
123	! 1551 2015-03-03 14:18:16Z maronga
124	! Added interface for different radiation schemes.
125	!
126	! 1496 2014-12-02 17:25:50Z maronga
127	! Added calls for the land surface model and radiation scheme
128	!
129	! 1402 2014-05-09 14:25:13Z raasch
130	! location messages modified
131	!
132	! 1384 2014-05-02 14:31:06Z raasch
133	! location messages added
134	!
135	! 1380 2014-04-28 12:40:45Z heinze
136	! CALL of nudge_ref added
137	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
138	!
139	! 1365 2014-04-22 15:03:56Z boeske
140	! Reset sums_ls_l to zero at each timestep
141	! +sums_ls_l
142	! Calculation of reference state (previously in subroutine calc_mean_profile)
143
144	! 1342 2014-03-26 17:04:47Z kanani
145	! REAL constants defined as wp-kind
146	!
147	! 1320 2014-03-20 08:40:49Z raasch
148	! ONLY-attribute added to USE-statements,
149	! kind-parameters added to all INTEGER and REAL declaration statements,
150	! kinds are defined in new module kinds,
151	! old module precision_kind is removed,
152	! revision history before 2012 removed,
153	! comment fields (!:) to be used for variable explanations added to
154	! all variable declaration statements
155	! 1318 2014-03-17 13:35:16Z raasch
156	! module interfaces removed
157	!
158	! 1308 2014-03-13 14:58:42Z fricke
159	! +netcdf_data_format_save
160	! For masked data, parallel netcdf output is not tested so far, hence
161	! netcdf_data_format is switched back to non-paralell output.
162	!
163	! 1276 2014-01-15 13:40:41Z heinze
164	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
165	!
166	! 1257 2013-11-08 15:18:40Z raasch
167	! acc-update-host directive for timestep removed
168	!
169	! 1241 2013-10-30 11:36:58Z heinze
170	! Generalize calc_mean_profile for wider use
171	! Determine shf and qsws in dependence on data from LSF_DATA
172	! Determine ug and vg in dependence on data from LSF_DATA
173	! 1221 2013-09-10 08:59:13Z raasch
174	! host update of arrays before timestep is called
175	!
176	! 1179 2013-06-14 05:57:58Z raasch
177	! mean profiles for reference state are only calculated if required,
178	! small bugfix for background communication
179	!
180	! 1171 2013-05-30 11:27:45Z raasch
181	! split of prognostic_equations deactivated (comment lines), for the time being
182	!
183	! 1128 2013-04-12 06:19:32Z raasch
184	! asynchronous transfer of ghost point data realized for acc-optimized version:
185	! prognostic_equations are first called two times for those points required for
186	! the left-right and north-south exchange, respectively, and then for the
187	! remaining points,
188	! those parts requiring global communication moved from prognostic_equations to
189	! here
190	!
191	! 1115 2013-03-26 18:16:16Z hoffmann
192	! calculation of qr and nr is restricted to precipitation
193	!
194	! 1113 2013-03-10 02:48:14Z raasch
195	! GPU-porting of boundary conditions,
196	! openACC directives updated
197	! formal parameter removed from routine boundary_conds
198	!
199	! 1111 2013-03-08 23:54:10Z raasch
200	! +internal timestep counter for cpu statistics added,
201	! openACC directives updated
202	!
203	! 1092 2013-02-02 11:24:22Z raasch
204	! unused variables removed
205	!
206	! 1065 2012-11-22 17:42:36Z hoffmann
207	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
208	!
209	! 1053 2012-11-13 17:11:03Z hoffmann
210	! exchange of ghost points for nr, qr added
211	!
212	! 1036 2012-10-22 13:43:42Z raasch
213	! code put under GPL (PALM 3.9)
214	!
215	! 1019 2012-09-28 06:46:45Z raasch
216	! non-optimized version of prognostic_equations removed
217	!
218	! 1015 2012-09-27 09:23:24Z raasch
219	! +call of prognostic_equations_acc
220	!
221	! 1001 2012-09-13 14:08:46Z raasch
222	! all actions concerning leapfrog- and upstream-spline-scheme removed
223	!
224	! 849 2012-03-15 10:35:09Z raasch
225	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
226	!
227	! 825 2012-02-19 03:03:44Z raasch
228	! wang_collision_kernel renamed wang_kernel
229	!
230	! Revision 1.1 1997/08/11 06:19:04 raasch
231	! Initial revision
232	!
233	!
234	! Description:
235	! ------------
236	!> Integration in time of the model equations, statistical analysis and graphic
237	!> output
238	!------------------------------------------------------------------------------!
239	SUBROUTINE time_integration
240
241
242	USE advec_ws, &
243	ONLY: ws_statistics
244
245	USE arrays_3d, &
246	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
247	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho_ocean, s, s_p, sa_p, &
248	tend, u, u_p, v, vpt, v_p, w, w_p
249
250	USE calc_mean_profile_mod, &
251	ONLY: calc_mean_profile
252
253	USE control_parameters, &
254	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
255	averaging_interval, averaging_interval_pr, &
256	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
257	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
258	cloud_physics, constant_flux_layer, constant_heatflux, &
259	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
260	coupling_start_time, current_timestep_number, &
261	disturbance_created, disturbance_energy_limit, dist_range, &
262	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
263	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
264	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
265	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
266	end_time, first_call_lpm, galilei_transformation, humidity, &
267	intermediate_timestep_count, &
268	intermediate_timestep_count_max, large_scale_forcing, &
269	loop_optimization, lsf_surf, lsf_vert, masks, &
270	microphysics_seifert, mid, nest_domain, &
271	neutral, nr_timesteps_this_run, nudging, &
272	ocean, on_device, passive_scalar, &
273	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
274	run_coupled, simulated_time, simulated_time_chr, &
275	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
276	skip_time_do3d, skip_time_domask, skip_time_dopr, &
277	skip_time_data_output_av, sloping_surface, &
278	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
279	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
280	time_do3d, time_domask, time_dopr, time_dopr_av, &
281	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
282	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
283	time_run_control, time_since_reference_point, &
284	turbulent_inflow, urban_surface, &
285	use_initial_profile_as_reference, &
286	use_single_reference_value, u_gtrans, v_gtrans, virtual_flight, &
287	ws_scheme_mom, ws_scheme_sca
288
289	USE cpulog, &
290	ONLY: cpu_log, log_point, log_point_s
291
292	USE flight_mod, &
293	ONLY: flight_measurement
294
295
296	USE indices, &
297	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
298	nxrg, nyn, nyng, nys, nysg, nzb, nzt, nzb_u_inner, nzb_v_inner
299
300	USE interaction_droplets_ptq_mod, &
301	ONLY: interaction_droplets_ptq
302
303	USE interfaces
304
305	USE kinds
306
307	USE land_surface_model_mod, &
308	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
309	skip_time_do_lsm
310
311	USE ls_forcing_mod, &
312	ONLY: ls_forcing_surf, ls_forcing_vert
313
314	USE microphysics_mod, &
315	ONLY: collision_turbulence
316
317	USE nudge_mod, &
318	ONLY: calc_tnudge, nudge_ref
319
320	USE particle_attributes, &
321	ONLY: particle_advection, particle_advection_start, &
322	use_sgs_for_particles, wang_kernel
323
324	USE pegrid
325
326	USE pmc_interface, &
327	ONLY: nested_run, nesting_mode, pmci_datatrans, &
328	pmci_ensure_nest_mass_conservation, pmci_synchronize
329
330	USE production_e_mod, &
331	ONLY: production_e_init
332
333	USE progress_bar, &
334	ONLY: finish_progress_bar, output_progress_bar
335
336	USE prognostic_equations_mod, &
337	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
338	prognostic_equations_vector
339
340	USE radiation_model_mod, &
341	ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
342	skip_time_do_radiation, time_radiation
343
344	USE spectra_mod, &
345	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
346	skip_time_dosp
347
348	USE statistics, &
349	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l, u_max, &
350	u_max_ijk, v_max, v_max_ijk, w_max, w_max_ijk
351
352	USE surface_layer_fluxes_mod, &
353	ONLY: surface_layer_fluxes
354
355	USE urban_surface_mod, &
356	ONLY: usm_material_heat_model, usm_material_model, &
357	usm_radiation, usm_surface_energy_balance
358
359	USE user_actions_mod, &
360	ONLY: user_actions
361
362	USE wind_turbine_model_mod, &
363	ONLY: wind_turbine, wtm_forces
364
365	IMPLICIT NONE
366
367	CHARACTER (LEN=9) :: time_to_string !<
368
369	REAL(wp) :: dt_3d_old !< temporary storage of timestep to be used for
370	!< steering of run control output interval
371
372	!
373	!-- At beginning determine the first time step
374	CALL timestep
375
376	!
377	!-- Synchronize the timestep in case of nested run.
378	IF ( nested_run ) THEN
379	!
380	!-- Synchronization by unifying the time step.
381	!-- Global minimum of all time-steps is used for all.
382	CALL pmci_synchronize
383	ENDIF
384
385	!
386	!-- Determine and print out the run control quantities before the first time
387	!-- step of this run. For the initial run, some statistics (e.g. divergence)
388	!-- need to be determined first.
389	IF ( simulated_time == 0.0_wp ) CALL flow_statistics
390	CALL run_control
391
392	!
393	!-- Data exchange between coupled models in case that a call has been omitted
394	!-- at the end of the previous run of a job chain.
395	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
396	!
397	!-- In case of model termination initiated by the local model the coupler
398	!-- must not be called because this would again cause an MPI hang.
399	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
400	CALL surface_coupler
401	time_coupling = time_coupling - dt_coupling
402	ENDDO
403	IF (time_coupling == 0.0_wp .AND. &
404	time_since_reference_point < dt_coupling ) &
405	THEN
406	time_coupling = time_since_reference_point
407	ENDIF
408	ENDIF
409
410	#if defined( __dvrp_graphics )
411	!
412	!-- Time measurement with dvrp software
413	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
414	#endif
415
416	CALL location_message( 'start with time-stepping', .TRUE. )
417	!
418	!-- Start of the time loop
419	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
420	.NOT. terminate_run )
421
422	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
423
424	!
425	!-- Determine ug, vg and w_subs in dependence on data from external file
426	!-- LSF_DATA
427	IF ( large_scale_forcing .AND. lsf_vert ) THEN
428	CALL ls_forcing_vert ( simulated_time )
429	sums_ls_l = 0.0_wp
430	ENDIF
431
432	!
433	!-- Set pt_init and q_init to the current profiles taken from
434	!-- NUDGING_DATA
435	IF ( nudging ) THEN
436	CALL nudge_ref ( simulated_time )
437	!
438	!-- Store temperature gradient at the top boundary for possible Neumann
439	!-- boundary condition
440	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
441	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
442	ENDIF
443
444	!
445	!-- Execute the user-defined actions
446	CALL user_actions( 'before_timestep' )
447
448	!
449	!-- Calculate forces by wind turbines
450	IF ( wind_turbine ) THEN
451
452	CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
453
454	CALL wtm_forces
455
456	CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
457
458	ENDIF
459
460	!
461	!-- Start of intermediate step loop
462	intermediate_timestep_count = 0
463	DO WHILE ( intermediate_timestep_count < &
464	intermediate_timestep_count_max )
465
466	intermediate_timestep_count = intermediate_timestep_count + 1
467
468	!
469	!-- Set the steering factors for the prognostic equations which depend
470	!-- on the timestep scheme
471	CALL timestep_scheme_steering
472
473	!
474	!-- Calculate those variables needed in the tendency terms which need
475	!-- global communication
476	IF ( .NOT. use_single_reference_value .AND. &
477	.NOT. use_initial_profile_as_reference ) THEN
478	!
479	!-- Horizontally averaged profiles to be used as reference state in
480	!-- buoyancy terms (WARNING: only the respective last call of
481	!-- calc_mean_profile defines the reference state!)
482	IF ( .NOT. neutral ) THEN
483	CALL calc_mean_profile( pt, 4 )
484	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
485	ENDIF
486	IF ( ocean ) THEN
487	CALL calc_mean_profile( rho_ocean, 64 )
488	ref_state(:) = hom(:,1,64,0)
489	ENDIF
490	IF ( humidity ) THEN
491	CALL calc_mean_profile( vpt, 44 )
492	ref_state(:) = hom(:,1,44,0)
493	ENDIF
494
495	ENDIF
496
497	IF ( .NOT. constant_diffusion ) CALL production_e_init
498	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
499	intermediate_timestep_count == 1 ) CALL ws_statistics
500	!
501	!-- In case of nudging calculate current nudging time scale and horizontal
502	!-- means of u, v, pt and q
503	IF ( nudging ) THEN
504	CALL calc_tnudge( simulated_time )
505	CALL calc_mean_profile( u, 1 )
506	CALL calc_mean_profile( v, 2 )
507	CALL calc_mean_profile( pt, 4 )
508	CALL calc_mean_profile( q, 41 )
509	ENDIF
510
511	!
512	!-- Solve the prognostic equations. A fast cache optimized version with
513	!-- only one single loop is used in case of Piascek-Williams advection
514	!-- scheme. NEC vector machines use a different version, because
515	!-- in the other versions a good vectorization is prohibited due to
516	!-- inlining problems.
517	IF ( loop_optimization == 'cache' ) THEN
518	CALL prognostic_equations_cache
519	ELSEIF ( loop_optimization == 'vector' ) THEN
520	CALL prognostic_equations_vector
521	ELSEIF ( loop_optimization == 'acc' ) THEN
522	i_left = nxl; i_right = nxr
523	j_south = nys; j_north = nyn
524	CALL prognostic_equations_acc
525
526	! i_left = nxl; i_right = nxl+nbgp-1
527	! j_south = nys; j_north = nyn
528	! CALL prognostic_equations_acc
529	! i_left = nxr-nbgp+1; i_right = nxr
530	! j_south = nys; j_north = nyn
531	! CALL prognostic_equations_acc
532
533	!
534	!-- Exchange of ghost points (lateral boundary conditions)
535	IF ( background_communication ) THEN
536
537	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
538
539	send_receive = 'lr'
540	sendrecv_in_background = .TRUE.
541	req = 0
542	req_count = 0
543
544	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
545	on_device = .TRUE. ! to be removed after complete porting
546	ELSE ! of ghost point exchange
547	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
548	ENDIF
549
550	CALL exchange_horiz( u_p, nbgp )
551	CALL exchange_horiz( v_p, nbgp )
552	CALL exchange_horiz( w_p, nbgp )
553	CALL exchange_horiz( pt_p, nbgp )
554	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
555	IF ( ocean ) THEN
556	CALL exchange_horiz( sa_p, nbgp )
557	CALL exchange_horiz( rho_ocean, nbgp )
558	CALL exchange_horiz( prho, nbgp )
559	ENDIF
560	IF ( humidity ) THEN
561	CALL exchange_horiz( q_p, nbgp )
562	IF ( cloud_physics .AND. microphysics_seifert ) THEN
563	CALL exchange_horiz( qr_p, nbgp )
564	CALL exchange_horiz( nr_p, nbgp )
565	ENDIF
566	ENDIF
567	IF ( cloud_droplets ) THEN
568	CALL exchange_horiz( ql, nbgp )
569	CALL exchange_horiz( ql_c, nbgp )
570	CALL exchange_horiz( ql_v, nbgp )
571	CALL exchange_horiz( ql_vp, nbgp )
572	ENDIF
573	IF ( wang_kernel .OR. collision_turbulence .OR. &
574	use_sgs_for_particles ) THEN
575	CALL exchange_horiz( diss, nbgp )
576	ENDIF
577	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
578
579	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
580	on_device = .FALSE. ! to be removed after complete porting
581	ELSE ! of ghost point exchange
582	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
583	ENDIF
584
585	sendrecv_in_background = .FALSE.
586
587	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
588
589	ENDIF
590
591	! i_left = nxl+nbgp; i_right = nxr-nbgp
592	! j_south = nys; j_north = nys+nbgp-1
593	! CALL prognostic_equations_acc
594	! i_left = nxl+nbgp; i_right = nxr-nbgp
595	! j_south = nyn-nbgp+1; j_north = nyn
596	! CALL prognostic_equations_acc
597
598	IF ( background_communication ) THEN
599	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
600	#if defined( __parallel )
601	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
602	#endif
603	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
604
605	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
606
607	send_receive = 'ns'
608	sendrecv_in_background = .TRUE.
609	req = 0
610	req_count = 0
611
612	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
613	on_device = .TRUE. ! to be removed after complete porting
614	ELSE ! of ghost point exchange
615	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
616	ENDIF
617
618	CALL exchange_horiz( u_p, nbgp )
619	CALL exchange_horiz( v_p, nbgp )
620	CALL exchange_horiz( w_p, nbgp )
621	CALL exchange_horiz( pt_p, nbgp )
622	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
623	IF ( ocean ) THEN
624	CALL exchange_horiz( sa_p, nbgp )
625	CALL exchange_horiz( rho_ocean, nbgp )
626	CALL exchange_horiz( prho, nbgp )
627	ENDIF
628	IF ( humidity ) THEN
629	CALL exchange_horiz( q_p, nbgp )
630	IF ( cloud_physics .AND. microphysics_seifert ) THEN
631	CALL exchange_horiz( qr_p, nbgp )
632	CALL exchange_horiz( nr_p, nbgp )
633	ENDIF
634	ENDIF
635	IF ( cloud_droplets ) THEN
636	CALL exchange_horiz( ql, nbgp )
637	CALL exchange_horiz( ql_c, nbgp )
638	CALL exchange_horiz( ql_v, nbgp )
639	CALL exchange_horiz( ql_vp, nbgp )
640	ENDIF
641	IF ( wang_kernel .OR. collision_turbulence .OR. &
642	use_sgs_for_particles ) THEN
643	CALL exchange_horiz( diss, nbgp )
644	ENDIF
645	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
646
647	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
648	on_device = .FALSE. ! to be removed after complete porting
649	ELSE ! of ghost point exchange
650	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
651	ENDIF
652
653	sendrecv_in_background = .FALSE.
654
655	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
656
657	ENDIF
658
659	! i_left = nxl+nbgp; i_right = nxr-nbgp
660	! j_south = nys+nbgp; j_north = nyn-nbgp
661	! CALL prognostic_equations_acc
662
663	IF ( background_communication ) THEN
664	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
665	#if defined( __parallel )
666	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
667	#endif
668	send_receive = 'al'
669	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
670	ENDIF
671
672	ENDIF
673
674	!
675	!-- Particle transport/physics with the Lagrangian particle model
676	!-- (only once during intermediate steps, because it uses an Euler-step)
677	!-- ### particle model should be moved before prognostic_equations, in order
678	!-- to regard droplet interactions directly
679	IF ( particle_advection .AND. &
680	simulated_time >= particle_advection_start .AND. &
681	intermediate_timestep_count == 1 ) THEN
682	CALL lpm
683	first_call_lpm = .FALSE.
684	ENDIF
685
686	!
687	!-- Interaction of droplets with temperature and specific humidity.
688	!-- Droplet condensation and evaporation is calculated within
689	!-- advec_particles.
690	IF ( cloud_droplets .AND. &
691	intermediate_timestep_count == intermediate_timestep_count_max )&
692	THEN
693	CALL interaction_droplets_ptq
694	ENDIF
695
696	!
697	!-- Exchange of ghost points (lateral boundary conditions)
698	IF ( .NOT. background_communication ) THEN
699
700	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
701
702	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
703	on_device = .TRUE. ! to be removed after complete porting
704	ELSE ! of ghost point exchange
705	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
706	ENDIF
707
708	CALL exchange_horiz( u_p, nbgp )
709	CALL exchange_horiz( v_p, nbgp )
710	CALL exchange_horiz( w_p, nbgp )
711	CALL exchange_horiz( pt_p, nbgp )
712	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
713	IF ( ocean ) THEN
714	CALL exchange_horiz( sa_p, nbgp )
715	CALL exchange_horiz( rho_ocean, nbgp )
716	CALL exchange_horiz( prho, nbgp )
717	ENDIF
718	IF ( humidity ) THEN
719	CALL exchange_horiz( q_p, nbgp )
720	IF ( cloud_physics .AND. microphysics_seifert ) THEN
721	CALL exchange_horiz( qr_p, nbgp )
722	CALL exchange_horiz( nr_p, nbgp )
723	ENDIF
724	ENDIF
725	IF ( cloud_droplets ) THEN
726	CALL exchange_horiz( ql, nbgp )
727	CALL exchange_horiz( ql_c, nbgp )
728	CALL exchange_horiz( ql_v, nbgp )
729	CALL exchange_horiz( ql_vp, nbgp )
730	ENDIF
731	IF ( wang_kernel .OR. collision_turbulence .OR. &
732	use_sgs_for_particles ) THEN
733	CALL exchange_horiz( diss, nbgp )
734	ENDIF
735	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
736
737	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
738	on_device = .FALSE. ! to be removed after complete porting
739	ELSE ! of ghost point exchange
740	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
741	ENDIF
742
743	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
744
745	ENDIF
746
747	!
748	!-- Boundary conditions for the prognostic quantities (except of the
749	!-- velocities at the outflow in case of a non-cyclic lateral wall)
750	CALL boundary_conds
751
752	!
753	!-- Swap the time levels in preparation for the next time step.
754	CALL swap_timelevel
755
756	IF ( nested_run ) THEN
757
758	CALL cpu_log( log_point(60), 'nesting', 'start' )
759	!
760	!-- Domain nesting. The data transfer subroutines pmci_parent_datatrans
761	!-- and pmci_child_datatrans are called inside the wrapper
762	!-- subroutine pmci_datatrans according to the control parameters
763	!-- nesting_mode and nesting_datatransfer_mode.
764	!-- TO_DO: why is nesting_mode given as a parameter here?
765	CALL pmci_datatrans( nesting_mode )
766
767	IF ( TRIM( nesting_mode ) == 'two-way' .OR. &
768	nesting_mode == 'vertical' ) THEN
769	!
770	!-- Exchange_horiz is needed for all parent-domains after the
771	!-- anterpolation
772	CALL exchange_horiz( u, nbgp )
773	CALL exchange_horiz( v, nbgp )
774	CALL exchange_horiz( w, nbgp )
775	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
776	IF ( humidity ) CALL exchange_horiz( q, nbgp )
777	IF ( passive_scalar ) CALL exchange_horiz( s, nbgp )
778	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
779	ENDIF
780	!
781	!-- Correct the w top-BC in nest domains to ensure mass conservation.
782	!-- This action must never be done for the root domain. Vertical
783	!-- nesting implies mass conservation.
784	IF ( nest_domain ) THEN
785	CALL pmci_ensure_nest_mass_conservation
786	ENDIF
787
788	CALL cpu_log( log_point(60), 'nesting', 'stop' )
789
790	ENDIF
791
792	!
793	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
794	!-- when a sloping surface is used
795	IF ( sloping_surface ) THEN
796	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
797	pt_slope_offset
798	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
799	pt_slope_offset
800	ENDIF
801
802	!
803	!-- Impose a turbulent inflow using the recycling method
804	IF ( turbulent_inflow ) CALL inflow_turbulence
805
806	!
807	!-- Impose a random perturbation on the horizontal velocity field
808	IF ( create_disturbances .AND. &
809	( call_psolver_at_all_substeps .AND. &
810	intermediate_timestep_count == intermediate_timestep_count_max )&
811	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
812	intermediate_timestep_count == 1 ) ) &
813	THEN
814	time_disturb = time_disturb + dt_3d
815	IF ( time_disturb >= dt_disturb ) THEN
816	!$acc update host( u, v )
817	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
818	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
819	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
820	CALL disturb_field( nzb_u_inner, tend, u )
821	CALL disturb_field( nzb_v_inner, tend, v )
822	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
823	!
824	!-- Runs with a non-cyclic lateral wall need perturbations
825	!-- near the inflow throughout the whole simulation
826	dist_range = 1
827	CALL disturb_field( nzb_u_inner, tend, u )
828	CALL disturb_field( nzb_v_inner, tend, v )
829	dist_range = 0
830	ENDIF
831	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
832	!$acc update device( u, v )
833	time_disturb = time_disturb - dt_disturb
834	ENDIF
835	ENDIF
836
837	!
838	!-- Reduce the velocity divergence via the equation for perturbation
839	!-- pressure.
840	IF ( intermediate_timestep_count == 1 .OR. &
841	call_psolver_at_all_substeps ) THEN
842	CALL pres
843	ENDIF
844
845	!
846	!-- If required, compute liquid water content
847	IF ( cloud_physics ) THEN
848	CALL calc_liquid_water_content
849	!$acc update device( ql )
850	ENDIF
851	!
852	!-- If required, compute virtual potential temperature
853	IF ( humidity ) THEN
854	CALL compute_vpt
855	!$acc update device( vpt )
856	ENDIF
857
858	!
859	!-- Compute the diffusion quantities
860	IF ( .NOT. constant_diffusion ) THEN
861
862	!
863	!-- Determine surface fluxes shf and qsws and surface values
864	!-- pt_surface and q_surface in dependence on data from external
865	!-- file LSF_DATA respectively
866	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
867	intermediate_timestep_count == intermediate_timestep_count_max )&
868	THEN
869	CALL ls_forcing_surf ( simulated_time )
870	ENDIF
871
872	!
873	!-- First the vertical fluxes in the surface (constant flux) layer are computed
874	IF ( constant_flux_layer ) THEN
875	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
876	CALL surface_layer_fluxes
877	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
878	ENDIF
879
880	!
881	!-- If required, solve the energy balance for the surface and run soil
882	!-- model
883	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
884
885	CALL cpu_log( log_point(54), 'land_surface', 'start' )
886	CALL lsm_energy_balance
887	CALL lsm_soil_model
888	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
889	ENDIF
890
891	!
892	!-- If required, solve the energy balance for urban surfaces and run
893	!-- the material heat model
894	IF (urban_surface) THEN
895	CALL cpu_log( log_point(74), 'urban_surface', 'start' )
896	CALL usm_surface_energy_balance
897	IF ( usm_material_model ) THEN
898	CALL usm_material_heat_model
899	ENDIF
900	CALL cpu_log( log_point(74), 'urban_surface', 'stop' )
901	ENDIF
902
903	!
904	!-- Compute the diffusion coefficients
905	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
906	IF ( .NOT. humidity ) THEN
907	IF ( ocean ) THEN
908	CALL diffusivities( prho, prho_reference )
909	ELSE
910	CALL diffusivities( pt, pt_reference )
911	ENDIF
912	ELSE
913	CALL diffusivities( vpt, pt_reference )
914	ENDIF
915	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
916
917	ENDIF
918
919	!
920	!-- If required, calculate radiative fluxes and heating rates
921	IF ( radiation .AND. intermediate_timestep_count &
922	== intermediate_timestep_count_max .AND. simulated_time > &
923	skip_time_do_radiation ) THEN
924
925	time_radiation = time_radiation + dt_3d
926
927	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
928	THEN
929
930	CALL cpu_log( log_point(50), 'radiation', 'start' )
931
932	IF ( .NOT. force_radiation_call ) THEN
933	time_radiation = time_radiation - dt_radiation
934	ENDIF
935
936	CALL radiation_control
937
938	CALL cpu_log( log_point(50), 'radiation', 'stop' )
939
940	IF (urban_surface) THEN
941	CALL cpu_log( log_point(75), 'usm_radiation', 'start' )
942	CALL usm_radiation
943	CALL cpu_log( log_point(75), 'usm_radiation', 'stop' )
944	ENDIF
945
946	ENDIF
947	ENDIF
948
949	ENDDO ! Intermediate step loop
950
951	!
952	!-- Increase simulation time and output times
953	nr_timesteps_this_run = nr_timesteps_this_run + 1
954	current_timestep_number = current_timestep_number + 1
955	simulated_time = simulated_time + dt_3d
956	simulated_time_chr = time_to_string( simulated_time )
957	time_since_reference_point = simulated_time - coupling_start_time
958
959
960
961	IF ( simulated_time >= skip_time_data_output_av ) THEN
962	time_do_av = time_do_av + dt_3d
963	ENDIF
964	IF ( simulated_time >= skip_time_do2d_xy ) THEN
965	time_do2d_xy = time_do2d_xy + dt_3d
966	ENDIF
967	IF ( simulated_time >= skip_time_do2d_xz ) THEN
968	time_do2d_xz = time_do2d_xz + dt_3d
969	ENDIF
970	IF ( simulated_time >= skip_time_do2d_yz ) THEN
971	time_do2d_yz = time_do2d_yz + dt_3d
972	ENDIF
973	IF ( simulated_time >= skip_time_do3d ) THEN
974	time_do3d = time_do3d + dt_3d
975	ENDIF
976	DO mid = 1, masks
977	IF ( simulated_time >= skip_time_domask(mid) ) THEN
978	time_domask(mid)= time_domask(mid) + dt_3d
979	ENDIF
980	ENDDO
981	time_dvrp = time_dvrp + dt_3d
982	IF ( simulated_time >= skip_time_dosp ) THEN
983	time_dosp = time_dosp + dt_3d
984	ENDIF
985	time_dots = time_dots + dt_3d
986	IF ( .NOT. first_call_lpm ) THEN
987	time_dopts = time_dopts + dt_3d
988	ENDIF
989	IF ( simulated_time >= skip_time_dopr ) THEN
990	time_dopr = time_dopr + dt_3d
991	ENDIF
992	time_dopr_listing = time_dopr_listing + dt_3d
993	time_run_control = time_run_control + dt_3d
994
995	!
996	!-- Data exchange between coupled models
997	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
998	time_coupling = time_coupling + dt_3d
999
1000	!
1001	!-- In case of model termination initiated by the local model
1002	!-- (terminate_coupled > 0), the coupler must be skipped because it would
1003	!-- cause an MPI intercomminucation hang.
1004	!-- If necessary, the coupler will be called at the beginning of the
1005	!-- next restart run.
1006	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
1007	CALL surface_coupler
1008	time_coupling = time_coupling - dt_coupling
1009	ENDDO
1010	ENDIF
1011
1012	!
1013	!-- Execute user-defined actions
1014	CALL user_actions( 'after_integration' )
1015
1016	!
1017	!-- If Galilei transformation is used, determine the distance that the
1018	!-- model has moved so far
1019	IF ( galilei_transformation ) THEN
1020	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
1021	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
1022	ENDIF
1023
1024	!
1025	!-- Check, if restart is necessary (because cpu-time is expiring or
1026	!-- because it is forced by user) and set stop flag
1027	!-- This call is skipped if the remote model has already initiated a restart.
1028	IF ( .NOT. terminate_run ) CALL check_for_restart
1029
1030	!
1031	!-- Carry out statistical analysis and output at the requested output times.
1032	!-- The MOD function is used for calculating the output time counters (like
1033	!-- time_dopr) in order to regard a possible decrease of the output time
1034	!-- interval in case of restart runs
1035
1036	!
1037	!-- Set a flag indicating that so far no statistics have been created
1038	!-- for this time step
1039	flow_statistics_called = .FALSE.
1040
1041	!
1042	!-- If required, call flow_statistics for averaging in time
1043	IF ( averaging_interval_pr /= 0.0_wp .AND. &
1044	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
1045	simulated_time >= skip_time_dopr ) THEN
1046	time_dopr_av = time_dopr_av + dt_3d
1047	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
1048	do_sum = .TRUE.
1049	time_dopr_av = MOD( time_dopr_av, &
1050	MAX( dt_averaging_input_pr, dt_3d ) )
1051	ENDIF
1052	ENDIF
1053	IF ( do_sum ) CALL flow_statistics
1054
1055	!
1056	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1057	IF ( averaging_interval /= 0.0_wp .AND. &
1058	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1059	simulated_time >= skip_time_data_output_av ) &
1060	THEN
1061	time_do_sla = time_do_sla + dt_3d
1062	IF ( time_do_sla >= dt_averaging_input ) THEN
1063	CALL sum_up_3d_data
1064	average_count_3d = average_count_3d + 1
1065	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1066	ENDIF
1067	ENDIF
1068
1069	!
1070	!-- Calculate spectra for time averaging
1071	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1072	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1073	simulated_time >= skip_time_dosp ) THEN
1074	time_dosp_av = time_dosp_av + dt_3d
1075	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1076	CALL calc_spectra
1077	time_dosp_av = MOD( time_dosp_av, &
1078	MAX( dt_averaging_input_pr, dt_3d ) )
1079	ENDIF
1080	ENDIF
1081
1082	!
1083	!-- Call flight module and output data
1084	IF ( virtual_flight ) THEN
1085	CALL flight_measurement
1086	CALL data_output_flight
1087	ENDIF
1088
1089	!
1090	!-- Profile output (ASCII) on file
1091	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1092	CALL print_1d
1093	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1094	dt_3d ) )
1095	ENDIF
1096
1097	!
1098	!-- Graphic output for PROFIL
1099	IF ( time_dopr >= dt_dopr ) THEN
1100	IF ( dopr_n /= 0 ) CALL data_output_profiles
1101	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1102	time_dopr_av = 0.0_wp ! due to averaging (see above)
1103	ENDIF
1104
1105	!
1106	!-- Graphic output for time series
1107	IF ( time_dots >= dt_dots ) THEN
1108	CALL data_output_tseries
1109	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1110	ENDIF
1111
1112	!
1113	!-- Output of spectra (formatted for use with PROFIL), in case of no
1114	!-- time averaging, spectra has to be calculated before
1115	IF ( time_dosp >= dt_dosp ) THEN
1116	IF ( average_count_sp == 0 ) CALL calc_spectra
1117	CALL data_output_spectra
1118	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1119	ENDIF
1120
1121	!
1122	!-- 2d-data output (cross-sections)
1123	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1124	CALL data_output_2d( 'xy', 0 )
1125	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1126	ENDIF
1127	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1128	CALL data_output_2d( 'xz', 0 )
1129	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1130	ENDIF
1131	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1132	CALL data_output_2d( 'yz', 0 )
1133	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1134	ENDIF
1135
1136	!
1137	!-- 3d-data output (volume data)
1138	IF ( time_do3d >= dt_do3d ) THEN
1139	CALL data_output_3d( 0 )
1140	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1141	ENDIF
1142
1143	!
1144	!-- Masked data output
1145	DO mid = 1, masks
1146	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1147	CALL data_output_mask( 0 )
1148	time_domask(mid) = MOD( time_domask(mid), &
1149	MAX( dt_domask(mid), dt_3d ) )
1150	ENDIF
1151	ENDDO
1152
1153	!
1154	!-- Output of time-averaged 2d/3d/masked data
1155	IF ( time_do_av >= dt_data_output_av ) THEN
1156	CALL average_3d_data
1157	CALL data_output_2d( 'xy', 1 )
1158	CALL data_output_2d( 'xz', 1 )
1159	CALL data_output_2d( 'yz', 1 )
1160	CALL data_output_3d( 1 )
1161	DO mid = 1, masks
1162	CALL data_output_mask( 1 )
1163	ENDDO
1164	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1165	ENDIF
1166
1167	!
1168	!-- Output of particle time series
1169	IF ( particle_advection ) THEN
1170	IF ( time_dopts >= dt_dopts .OR. &
1171	( simulated_time >= particle_advection_start .AND. &
1172	first_call_lpm ) ) THEN
1173	CALL data_output_ptseries
1174	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1175	ENDIF
1176	ENDIF
1177
1178	!
1179	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1180	#if defined( __dvrp_graphics )
1181	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1182	#endif
1183	IF ( time_dvrp >= dt_dvrp ) THEN
1184	CALL data_output_dvrp
1185	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1186	ENDIF
1187	#if defined( __dvrp_graphics )
1188	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1189	#endif
1190
1191	!
1192	!-- If required, set the heat flux for the next time step at a random value
1193	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1194
1195	!
1196	!-- Execute user-defined actions
1197	CALL user_actions( 'after_timestep' )
1198
1199	!
1200	!-- Determine size of next time step. Save timestep dt_3d because it is
1201	!-- newly calculated in routine timestep, but required further below for
1202	!-- steering the run control output interval
1203	dt_3d_old = dt_3d
1204	CALL timestep
1205
1206	!
1207	!-- Synchronize the timestep in case of nested run.
1208	IF ( nested_run ) THEN
1209	!
1210	!-- Synchronize by unifying the time step.
1211	!-- Global minimum of all time-steps is used for all.
1212	CALL pmci_synchronize
1213	ENDIF
1214
1215	!
1216	!-- Computation and output of run control parameters.
1217	!-- This is also done whenever perturbations have been imposed
1218	IF ( time_run_control >= dt_run_control .OR. &
1219	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1220	THEN
1221	CALL run_control
1222	IF ( time_run_control >= dt_run_control ) THEN
1223	time_run_control = MOD( time_run_control, &
1224	MAX( dt_run_control, dt_3d_old ) )
1225	ENDIF
1226	ENDIF
1227
1228	!
1229	!-- Output elapsed simulated time in form of a progress bar on stdout
1230	IF ( myid == 0 ) CALL output_progress_bar
1231
1232	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1233
1234
1235	ENDDO ! time loop
1236
1237	IF ( myid == 0 ) CALL finish_progress_bar
1238
1239	#if defined( __dvrp_graphics )
1240	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1241	#endif
1242
1243	CALL location_message( 'finished time-stepping', .TRUE. )
1244
1245	END SUBROUTINE time_integration

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