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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 1997-2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: time_integration.f90 2101 2017-01-05 16:42:31Z kanani $
27	!
28	! 2050 2016-11-08 15:00:55Z gronemeier
29	! Implement turbulent outflow condition
30	!
31	! 2031 2016-10-21 15:11:58Z knoop
32	! renamed variable rho to rho_ocean
33	!
34	! 2011 2016-09-19 17:29:57Z kanani
35	! Flag urban_surface is now defined in module control_parameters,
36	! removed commented CALLs of global_min_max.
37	!
38	! 2007 2016-08-24 15:47:17Z kanani
39	! Added CALLs for new urban surface model
40	!
41	! 2000 2016-08-20 18:09:15Z knoop
42	! Forced header and separation lines into 80 columns
43	!
44	! 1976 2016-07-27 13:28:04Z maronga
45	! Simplified calls to radiation model
46	!
47	! 1960 2016-07-12 16:34:24Z suehring
48	! Separate humidity and passive scalar
49	!
50	! 1957 2016-07-07 10:43:48Z suehring
51	! flight module added
52	!
53	! 1919 2016-05-27 14:51:23Z raasch
54	! Initial version of purely vertical nesting introduced.
55	!
56	! 1918 2016-05-27 14:35:57Z raasch
57	! determination of time step moved to the end of the time step loop,
58	! the first time step is now always calculated before the time step loop (i.e.
59	! also in case of restart runs)
60	!
61	! 1914 2016-05-26 14:44:07Z witha
62	! Added call for wind turbine model
63	!
64	! 1878 2016-04-19 12:30:36Z hellstea
65	! Synchronization for nested runs rewritten
66	!
67	! 1853 2016-04-11 09:00:35Z maronga
68	! Adjusted for use with radiation_scheme = constant
69	!
70	! 1849 2016-04-08 11:33:18Z hoffmann
71	! Adapted for modularization of microphysics
72	!
73	! 1833 2016-04-07 14:23:03Z raasch
74	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
75	!
76	! 1831 2016-04-07 13:15:51Z hoffmann
77	! turbulence renamed collision_turbulence
78	!
79	! 1822 2016-04-07 07:49:42Z hoffmann
80	! icloud_scheme replaced by microphysics_*
81	!
82	! 1808 2016-04-05 19:44:00Z raasch
83	! output message in case unscheduled radiation calls removed
84	!
85	! 1797 2016-03-21 16:50:28Z raasch
86	! introduction of different datatransfer modes
87	!
88	! 1791 2016-03-11 10:41:25Z raasch
89	! call of pmci_update_new removed
90	!
91	! 1786 2016-03-08 05:49:27Z raasch
92	! +module spectrum
93	!
94	! 1783 2016-03-06 18:36:17Z raasch
95	! switch back of netcdf data format for mask output moved to the mask output
96	! routine
97	!
98	! 1781 2016-03-03 15:12:23Z raasch
99	! some pmc calls removed at the beginning (before timeloop),
100	! pmc initialization moved to the main program
101	!
102	! 1764 2016-02-28 12:45:19Z raasch
103	! PMC_ACTIVE flags removed,
104	! bugfix: nest synchronization after first call of timestep
105	!
106	! 1762 2016-02-25 12:31:13Z hellstea
107	! Introduction of nested domain feature
108	!
109	! 1736 2015-12-04 08:56:33Z raasch
110	! no perturbations added to total domain if energy limit has been set zero
111	!
112	! 1691 2015-10-26 16:17:44Z maronga
113	! Added option for spin-ups without land surface and radiation models. Moved calls
114	! for radiation and lan surface schemes.
115	!
116	! 1682 2015-10-07 23:56:08Z knoop
117	! Code annotations made doxygen readable
118	!
119	! 1671 2015-09-25 03:29:37Z raasch
120	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
121	! for particles
122	!
123	! 1585 2015-04-30 07:05:52Z maronga
124	! Moved call of radiation scheme. Added support for RRTM
125	!
126	! 1551 2015-03-03 14:18:16Z maronga
127	! Added interface for different radiation schemes.
128	!
129	! 1496 2014-12-02 17:25:50Z maronga
130	! Added calls for the land surface model and radiation scheme
131	!
132	! 1402 2014-05-09 14:25:13Z raasch
133	! location messages modified
134	!
135	! 1384 2014-05-02 14:31:06Z raasch
136	! location messages added
137	!
138	! 1380 2014-04-28 12:40:45Z heinze
139	! CALL of nudge_ref added
140	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
141	!
142	! 1365 2014-04-22 15:03:56Z boeske
143	! Reset sums_ls_l to zero at each timestep
144	! +sums_ls_l
145	! Calculation of reference state (previously in subroutine calc_mean_profile)
146
147	! 1342 2014-03-26 17:04:47Z kanani
148	! REAL constants defined as wp-kind
149	!
150	! 1320 2014-03-20 08:40:49Z raasch
151	! ONLY-attribute added to USE-statements,
152	! kind-parameters added to all INTEGER and REAL declaration statements,
153	! kinds are defined in new module kinds,
154	! old module precision_kind is removed,
155	! revision history before 2012 removed,
156	! comment fields (!:) to be used for variable explanations added to
157	! all variable declaration statements
158	! 1318 2014-03-17 13:35:16Z raasch
159	! module interfaces removed
160	!
161	! 1308 2014-03-13 14:58:42Z fricke
162	! +netcdf_data_format_save
163	! For masked data, parallel netcdf output is not tested so far, hence
164	! netcdf_data_format is switched back to non-paralell output.
165	!
166	! 1276 2014-01-15 13:40:41Z heinze
167	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
168	!
169	! 1257 2013-11-08 15:18:40Z raasch
170	! acc-update-host directive for timestep removed
171	!
172	! 1241 2013-10-30 11:36:58Z heinze
173	! Generalize calc_mean_profile for wider use
174	! Determine shf and qsws in dependence on data from LSF_DATA
175	! Determine ug and vg in dependence on data from LSF_DATA
176	! 1221 2013-09-10 08:59:13Z raasch
177	! host update of arrays before timestep is called
178	!
179	! 1179 2013-06-14 05:57:58Z raasch
180	! mean profiles for reference state are only calculated if required,
181	! small bugfix for background communication
182	!
183	! 1171 2013-05-30 11:27:45Z raasch
184	! split of prognostic_equations deactivated (comment lines), for the time being
185	!
186	! 1128 2013-04-12 06:19:32Z raasch
187	! asynchronous transfer of ghost point data realized for acc-optimized version:
188	! prognostic_equations are first called two times for those points required for
189	! the left-right and north-south exchange, respectively, and then for the
190	! remaining points,
191	! those parts requiring global communication moved from prognostic_equations to
192	! here
193	!
194	! 1115 2013-03-26 18:16:16Z hoffmann
195	! calculation of qr and nr is restricted to precipitation
196	!
197	! 1113 2013-03-10 02:48:14Z raasch
198	! GPU-porting of boundary conditions,
199	! openACC directives updated
200	! formal parameter removed from routine boundary_conds
201	!
202	! 1111 2013-03-08 23:54:10Z raasch
203	! +internal timestep counter for cpu statistics added,
204	! openACC directives updated
205	!
206	! 1092 2013-02-02 11:24:22Z raasch
207	! unused variables removed
208	!
209	! 1065 2012-11-22 17:42:36Z hoffmann
210	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
211	!
212	! 1053 2012-11-13 17:11:03Z hoffmann
213	! exchange of ghost points for nr, qr added
214	!
215	! 1036 2012-10-22 13:43:42Z raasch
216	! code put under GPL (PALM 3.9)
217	!
218	! 1019 2012-09-28 06:46:45Z raasch
219	! non-optimized version of prognostic_equations removed
220	!
221	! 1015 2012-09-27 09:23:24Z raasch
222	! +call of prognostic_equations_acc
223	!
224	! 1001 2012-09-13 14:08:46Z raasch
225	! all actions concerning leapfrog- and upstream-spline-scheme removed
226	!
227	! 849 2012-03-15 10:35:09Z raasch
228	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
229	!
230	! 825 2012-02-19 03:03:44Z raasch
231	! wang_collision_kernel renamed wang_kernel
232	!
233	! Revision 1.1 1997/08/11 06:19:04 raasch
234	! Initial revision
235	!
236	!
237	! Description:
238	! ------------
239	!> Integration in time of the model equations, statistical analysis and graphic
240	!> output
241	!------------------------------------------------------------------------------!
242	SUBROUTINE time_integration
243
244
245	USE advec_ws, &
246	ONLY: ws_statistics
247
248	USE arrays_3d, &
249	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
250	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho_ocean, s, s_p, sa_p, &
251	tend, u, u_p, v, vpt, v_p, w, w_p
252
253	USE calc_mean_profile_mod, &
254	ONLY: calc_mean_profile
255
256	USE control_parameters, &
257	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
258	averaging_interval, averaging_interval_pr, &
259	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
260	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
261	cloud_physics, constant_flux_layer, constant_heatflux, &
262	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
263	coupling_start_time, current_timestep_number, &
264	disturbance_created, disturbance_energy_limit, dist_range, &
265	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
266	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
267	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
268	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
269	end_time, first_call_lpm, galilei_transformation, humidity, &
270	intermediate_timestep_count, &
271	intermediate_timestep_count_max, large_scale_forcing, &
272	loop_optimization, lsf_surf, lsf_vert, masks, &
273	microphysics_seifert, mid, nest_domain, &
274	neutral, nr_timesteps_this_run, nudging, &
275	ocean, on_device, passive_scalar, &
276	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
277	run_coupled, simulated_time, simulated_time_chr, &
278	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
279	skip_time_do3d, skip_time_domask, skip_time_dopr, &
280	skip_time_data_output_av, sloping_surface, &
281	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
282	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
283	time_do3d, time_domask, time_dopr, time_dopr_av, &
284	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
285	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
286	time_run_control, time_since_reference_point, &
287	turbulent_inflow, turbulent_outflow, urban_surface, &
288	use_initial_profile_as_reference, &
289	use_single_reference_value, u_gtrans, v_gtrans, virtual_flight, &
290	ws_scheme_mom, ws_scheme_sca
291
292	USE cpulog, &
293	ONLY: cpu_log, log_point, log_point_s
294
295	USE flight_mod, &
296	ONLY: flight_measurement
297
298
299	USE indices, &
300	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
301	nxrg, nyn, nyng, nys, nysg, nzb, nzt, nzb_u_inner, nzb_v_inner
302
303	USE interaction_droplets_ptq_mod, &
304	ONLY: interaction_droplets_ptq
305
306	USE interfaces
307
308	USE kinds
309
310	USE land_surface_model_mod, &
311	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
312	skip_time_do_lsm
313
314	USE ls_forcing_mod, &
315	ONLY: ls_forcing_surf, ls_forcing_vert
316
317	USE microphysics_mod, &
318	ONLY: collision_turbulence
319
320	USE nudge_mod, &
321	ONLY: calc_tnudge, nudge_ref
322
323	USE particle_attributes, &
324	ONLY: particle_advection, particle_advection_start, &
325	use_sgs_for_particles, wang_kernel
326
327	USE pegrid
328
329	USE pmc_interface, &
330	ONLY: nested_run, nesting_mode, pmci_datatrans, &
331	pmci_ensure_nest_mass_conservation, pmci_synchronize
332
333	USE production_e_mod, &
334	ONLY: production_e_init
335
336	USE progress_bar, &
337	ONLY: finish_progress_bar, output_progress_bar
338
339	USE prognostic_equations_mod, &
340	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
341	prognostic_equations_vector
342
343	USE radiation_model_mod, &
344	ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
345	skip_time_do_radiation, time_radiation
346
347	USE spectra_mod, &
348	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
349	skip_time_dosp
350
351	USE statistics, &
352	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l, u_max, &
353	u_max_ijk, v_max, v_max_ijk, w_max, w_max_ijk
354
355	USE surface_layer_fluxes_mod, &
356	ONLY: surface_layer_fluxes
357
358	USE urban_surface_mod, &
359	ONLY: usm_material_heat_model, usm_material_model, &
360	usm_radiation, usm_surface_energy_balance
361
362	USE user_actions_mod, &
363	ONLY: user_actions
364
365	USE wind_turbine_model_mod, &
366	ONLY: wind_turbine, wtm_forces
367
368	IMPLICIT NONE
369
370	CHARACTER (LEN=9) :: time_to_string !<
371
372	REAL(wp) :: dt_3d_old !< temporary storage of timestep to be used for
373	!< steering of run control output interval
374
375	!
376	!-- At beginning determine the first time step
377	CALL timestep
378
379	!
380	!-- Synchronize the timestep in case of nested run.
381	IF ( nested_run ) THEN
382	!
383	!-- Synchronization by unifying the time step.
384	!-- Global minimum of all time-steps is used for all.
385	CALL pmci_synchronize
386	ENDIF
387
388	!
389	!-- Determine and print out the run control quantities before the first time
390	!-- step of this run. For the initial run, some statistics (e.g. divergence)
391	!-- need to be determined first.
392	IF ( simulated_time == 0.0_wp ) CALL flow_statistics
393	CALL run_control
394
395	!
396	!-- Data exchange between coupled models in case that a call has been omitted
397	!-- at the end of the previous run of a job chain.
398	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
399	!
400	!-- In case of model termination initiated by the local model the coupler
401	!-- must not be called because this would again cause an MPI hang.
402	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
403	CALL surface_coupler
404	time_coupling = time_coupling - dt_coupling
405	ENDDO
406	IF (time_coupling == 0.0_wp .AND. &
407	time_since_reference_point < dt_coupling ) &
408	THEN
409	time_coupling = time_since_reference_point
410	ENDIF
411	ENDIF
412
413	#if defined( __dvrp_graphics )
414	!
415	!-- Time measurement with dvrp software
416	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
417	#endif
418
419	CALL location_message( 'start with time-stepping', .TRUE. )
420	!
421	!-- Start of the time loop
422	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
423	.NOT. terminate_run )
424
425	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
426
427	!
428	!-- Determine ug, vg and w_subs in dependence on data from external file
429	!-- LSF_DATA
430	IF ( large_scale_forcing .AND. lsf_vert ) THEN
431	CALL ls_forcing_vert ( simulated_time )
432	sums_ls_l = 0.0_wp
433	ENDIF
434
435	!
436	!-- Set pt_init and q_init to the current profiles taken from
437	!-- NUDGING_DATA
438	IF ( nudging ) THEN
439	CALL nudge_ref ( simulated_time )
440	!
441	!-- Store temperature gradient at the top boundary for possible Neumann
442	!-- boundary condition
443	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
444	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
445	ENDIF
446
447	!
448	!-- Execute the user-defined actions
449	CALL user_actions( 'before_timestep' )
450
451	!
452	!-- Calculate forces by wind turbines
453	IF ( wind_turbine ) THEN
454
455	CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
456
457	CALL wtm_forces
458
459	CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
460
461	ENDIF
462
463	!
464	!-- Start of intermediate step loop
465	intermediate_timestep_count = 0
466	DO WHILE ( intermediate_timestep_count < &
467	intermediate_timestep_count_max )
468
469	intermediate_timestep_count = intermediate_timestep_count + 1
470
471	!
472	!-- Set the steering factors for the prognostic equations which depend
473	!-- on the timestep scheme
474	CALL timestep_scheme_steering
475
476	!
477	!-- Calculate those variables needed in the tendency terms which need
478	!-- global communication
479	IF ( .NOT. use_single_reference_value .AND. &
480	.NOT. use_initial_profile_as_reference ) THEN
481	!
482	!-- Horizontally averaged profiles to be used as reference state in
483	!-- buoyancy terms (WARNING: only the respective last call of
484	!-- calc_mean_profile defines the reference state!)
485	IF ( .NOT. neutral ) THEN
486	CALL calc_mean_profile( pt, 4 )
487	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
488	ENDIF
489	IF ( ocean ) THEN
490	CALL calc_mean_profile( rho_ocean, 64 )
491	ref_state(:) = hom(:,1,64,0)
492	ENDIF
493	IF ( humidity ) THEN
494	CALL calc_mean_profile( vpt, 44 )
495	ref_state(:) = hom(:,1,44,0)
496	ENDIF
497
498	ENDIF
499
500	IF ( .NOT. constant_diffusion ) CALL production_e_init
501	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
502	intermediate_timestep_count == 1 ) CALL ws_statistics
503	!
504	!-- In case of nudging calculate current nudging time scale and horizontal
505	!-- means of u, v, pt and q
506	IF ( nudging ) THEN
507	CALL calc_tnudge( simulated_time )
508	CALL calc_mean_profile( u, 1 )
509	CALL calc_mean_profile( v, 2 )
510	CALL calc_mean_profile( pt, 4 )
511	CALL calc_mean_profile( q, 41 )
512	ENDIF
513
514	!
515	!-- Solve the prognostic equations. A fast cache optimized version with
516	!-- only one single loop is used in case of Piascek-Williams advection
517	!-- scheme. NEC vector machines use a different version, because
518	!-- in the other versions a good vectorization is prohibited due to
519	!-- inlining problems.
520	IF ( loop_optimization == 'cache' ) THEN
521	CALL prognostic_equations_cache
522	ELSEIF ( loop_optimization == 'vector' ) THEN
523	CALL prognostic_equations_vector
524	ELSEIF ( loop_optimization == 'acc' ) THEN
525	i_left = nxl; i_right = nxr
526	j_south = nys; j_north = nyn
527	CALL prognostic_equations_acc
528
529	! i_left = nxl; i_right = nxl+nbgp-1
530	! j_south = nys; j_north = nyn
531	! CALL prognostic_equations_acc
532	! i_left = nxr-nbgp+1; i_right = nxr
533	! j_south = nys; j_north = nyn
534	! CALL prognostic_equations_acc
535
536	!
537	!-- Exchange of ghost points (lateral boundary conditions)
538	IF ( background_communication ) THEN
539
540	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
541
542	send_receive = 'lr'
543	sendrecv_in_background = .TRUE.
544	req = 0
545	req_count = 0
546
547	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
548	on_device = .TRUE. ! to be removed after complete porting
549	ELSE ! of ghost point exchange
550	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
551	ENDIF
552
553	CALL exchange_horiz( u_p, nbgp )
554	CALL exchange_horiz( v_p, nbgp )
555	CALL exchange_horiz( w_p, nbgp )
556	CALL exchange_horiz( pt_p, nbgp )
557	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
558	IF ( ocean ) THEN
559	CALL exchange_horiz( sa_p, nbgp )
560	CALL exchange_horiz( rho_ocean, nbgp )
561	CALL exchange_horiz( prho, nbgp )
562	ENDIF
563	IF ( humidity ) THEN
564	CALL exchange_horiz( q_p, nbgp )
565	IF ( cloud_physics .AND. microphysics_seifert ) THEN
566	CALL exchange_horiz( qr_p, nbgp )
567	CALL exchange_horiz( nr_p, nbgp )
568	ENDIF
569	ENDIF
570	IF ( cloud_droplets ) THEN
571	CALL exchange_horiz( ql, nbgp )
572	CALL exchange_horiz( ql_c, nbgp )
573	CALL exchange_horiz( ql_v, nbgp )
574	CALL exchange_horiz( ql_vp, nbgp )
575	ENDIF
576	IF ( wang_kernel .OR. collision_turbulence .OR. &
577	use_sgs_for_particles ) THEN
578	CALL exchange_horiz( diss, nbgp )
579	ENDIF
580	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
581
582	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
583	on_device = .FALSE. ! to be removed after complete porting
584	ELSE ! of ghost point exchange
585	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
586	ENDIF
587
588	sendrecv_in_background = .FALSE.
589
590	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
591
592	ENDIF
593
594	! i_left = nxl+nbgp; i_right = nxr-nbgp
595	! j_south = nys; j_north = nys+nbgp-1
596	! CALL prognostic_equations_acc
597	! i_left = nxl+nbgp; i_right = nxr-nbgp
598	! j_south = nyn-nbgp+1; j_north = nyn
599	! CALL prognostic_equations_acc
600
601	IF ( background_communication ) THEN
602	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
603	#if defined( __parallel )
604	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
605	#endif
606	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
607
608	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
609
610	send_receive = 'ns'
611	sendrecv_in_background = .TRUE.
612	req = 0
613	req_count = 0
614
615	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
616	on_device = .TRUE. ! to be removed after complete porting
617	ELSE ! of ghost point exchange
618	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
619	ENDIF
620
621	CALL exchange_horiz( u_p, nbgp )
622	CALL exchange_horiz( v_p, nbgp )
623	CALL exchange_horiz( w_p, nbgp )
624	CALL exchange_horiz( pt_p, nbgp )
625	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
626	IF ( ocean ) THEN
627	CALL exchange_horiz( sa_p, nbgp )
628	CALL exchange_horiz( rho_ocean, nbgp )
629	CALL exchange_horiz( prho, nbgp )
630	ENDIF
631	IF ( humidity ) THEN
632	CALL exchange_horiz( q_p, nbgp )
633	IF ( cloud_physics .AND. microphysics_seifert ) THEN
634	CALL exchange_horiz( qr_p, nbgp )
635	CALL exchange_horiz( nr_p, nbgp )
636	ENDIF
637	ENDIF
638	IF ( cloud_droplets ) THEN
639	CALL exchange_horiz( ql, nbgp )
640	CALL exchange_horiz( ql_c, nbgp )
641	CALL exchange_horiz( ql_v, nbgp )
642	CALL exchange_horiz( ql_vp, nbgp )
643	ENDIF
644	IF ( wang_kernel .OR. collision_turbulence .OR. &
645	use_sgs_for_particles ) THEN
646	CALL exchange_horiz( diss, nbgp )
647	ENDIF
648	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
649
650	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
651	on_device = .FALSE. ! to be removed after complete porting
652	ELSE ! of ghost point exchange
653	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
654	ENDIF
655
656	sendrecv_in_background = .FALSE.
657
658	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
659
660	ENDIF
661
662	! i_left = nxl+nbgp; i_right = nxr-nbgp
663	! j_south = nys+nbgp; j_north = nyn-nbgp
664	! CALL prognostic_equations_acc
665
666	IF ( background_communication ) THEN
667	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
668	#if defined( __parallel )
669	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
670	#endif
671	send_receive = 'al'
672	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
673	ENDIF
674
675	ENDIF
676
677	!
678	!-- Particle transport/physics with the Lagrangian particle model
679	!-- (only once during intermediate steps, because it uses an Euler-step)
680	!-- ### particle model should be moved before prognostic_equations, in order
681	!-- to regard droplet interactions directly
682	IF ( particle_advection .AND. &
683	simulated_time >= particle_advection_start .AND. &
684	intermediate_timestep_count == 1 ) THEN
685	CALL lpm
686	first_call_lpm = .FALSE.
687	ENDIF
688
689	!
690	!-- Interaction of droplets with temperature and specific humidity.
691	!-- Droplet condensation and evaporation is calculated within
692	!-- advec_particles.
693	IF ( cloud_droplets .AND. &
694	intermediate_timestep_count == intermediate_timestep_count_max )&
695	THEN
696	CALL interaction_droplets_ptq
697	ENDIF
698
699	!
700	!-- Exchange of ghost points (lateral boundary conditions)
701	IF ( .NOT. background_communication ) THEN
702
703	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
704
705	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
706	on_device = .TRUE. ! to be removed after complete porting
707	ELSE ! of ghost point exchange
708	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
709	ENDIF
710
711	CALL exchange_horiz( u_p, nbgp )
712	CALL exchange_horiz( v_p, nbgp )
713	CALL exchange_horiz( w_p, nbgp )
714	CALL exchange_horiz( pt_p, nbgp )
715	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
716	IF ( ocean ) THEN
717	CALL exchange_horiz( sa_p, nbgp )
718	CALL exchange_horiz( rho_ocean, nbgp )
719	CALL exchange_horiz( prho, nbgp )
720	ENDIF
721	IF ( humidity ) THEN
722	CALL exchange_horiz( q_p, nbgp )
723	IF ( cloud_physics .AND. microphysics_seifert ) THEN
724	CALL exchange_horiz( qr_p, nbgp )
725	CALL exchange_horiz( nr_p, nbgp )
726	ENDIF
727	ENDIF
728	IF ( cloud_droplets ) THEN
729	CALL exchange_horiz( ql, nbgp )
730	CALL exchange_horiz( ql_c, nbgp )
731	CALL exchange_horiz( ql_v, nbgp )
732	CALL exchange_horiz( ql_vp, nbgp )
733	ENDIF
734	IF ( wang_kernel .OR. collision_turbulence .OR. &
735	use_sgs_for_particles ) THEN
736	CALL exchange_horiz( diss, nbgp )
737	ENDIF
738	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
739
740	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
741	on_device = .FALSE. ! to be removed after complete porting
742	ELSE ! of ghost point exchange
743	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
744	ENDIF
745
746	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
747
748	ENDIF
749
750	!
751	!-- Boundary conditions for the prognostic quantities (except of the
752	!-- velocities at the outflow in case of a non-cyclic lateral wall)
753	CALL boundary_conds
754
755	!
756	!-- Swap the time levels in preparation for the next time step.
757	CALL swap_timelevel
758
759	IF ( nested_run ) THEN
760
761	CALL cpu_log( log_point(60), 'nesting', 'start' )
762	!
763	!-- Domain nesting. The data transfer subroutines pmci_parent_datatrans
764	!-- and pmci_child_datatrans are called inside the wrapper
765	!-- subroutine pmci_datatrans according to the control parameters
766	!-- nesting_mode and nesting_datatransfer_mode.
767	!-- TO_DO: why is nesting_mode given as a parameter here?
768	CALL pmci_datatrans( nesting_mode )
769
770	IF ( TRIM( nesting_mode ) == 'two-way' .OR. &
771	nesting_mode == 'vertical' ) THEN
772	!
773	!-- Exchange_horiz is needed for all parent-domains after the
774	!-- anterpolation
775	CALL exchange_horiz( u, nbgp )
776	CALL exchange_horiz( v, nbgp )
777	CALL exchange_horiz( w, nbgp )
778	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
779	IF ( humidity ) CALL exchange_horiz( q, nbgp )
780	IF ( passive_scalar ) CALL exchange_horiz( s, nbgp )
781	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
782	ENDIF
783	!
784	!-- Correct the w top-BC in nest domains to ensure mass conservation.
785	!-- This action must never be done for the root domain. Vertical
786	!-- nesting implies mass conservation.
787	IF ( nest_domain ) THEN
788	CALL pmci_ensure_nest_mass_conservation
789	ENDIF
790
791	CALL cpu_log( log_point(60), 'nesting', 'stop' )
792
793	ENDIF
794
795	!
796	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
797	!-- when a sloping surface is used
798	IF ( sloping_surface ) THEN
799	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
800	pt_slope_offset
801	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
802	pt_slope_offset
803	ENDIF
804
805	!
806	!-- Impose a turbulent inflow using the recycling method
807	IF ( turbulent_inflow ) CALL inflow_turbulence
808
809	!
810	!-- Set values at outflow boundary using the special outflow condition
811	IF ( turbulent_outflow ) CALL outflow_turbulence
812
813	!
814	!-- Impose a random perturbation on the horizontal velocity field
815	IF ( create_disturbances .AND. &
816	( call_psolver_at_all_substeps .AND. &
817	intermediate_timestep_count == intermediate_timestep_count_max )&
818	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
819	intermediate_timestep_count == 1 ) ) &
820	THEN
821	time_disturb = time_disturb + dt_3d
822	IF ( time_disturb >= dt_disturb ) THEN
823	!$acc update host( u, v )
824	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
825	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
826	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
827	CALL disturb_field( nzb_u_inner, tend, u )
828	CALL disturb_field( nzb_v_inner, tend, v )
829	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
830	!
831	!-- Runs with a non-cyclic lateral wall need perturbations
832	!-- near the inflow throughout the whole simulation
833	dist_range = 1
834	CALL disturb_field( nzb_u_inner, tend, u )
835	CALL disturb_field( nzb_v_inner, tend, v )
836	dist_range = 0
837	ENDIF
838	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
839	!$acc update device( u, v )
840	time_disturb = time_disturb - dt_disturb
841	ENDIF
842	ENDIF
843
844	!
845	!-- Reduce the velocity divergence via the equation for perturbation
846	!-- pressure.
847	IF ( intermediate_timestep_count == 1 .OR. &
848	call_psolver_at_all_substeps ) THEN
849	CALL pres
850	ENDIF
851
852	!
853	!-- If required, compute liquid water content
854	IF ( cloud_physics ) THEN
855	CALL calc_liquid_water_content
856	!$acc update device( ql )
857	ENDIF
858	!
859	!-- If required, compute virtual potential temperature
860	IF ( humidity ) THEN
861	CALL compute_vpt
862	!$acc update device( vpt )
863	ENDIF
864
865	!
866	!-- Compute the diffusion quantities
867	IF ( .NOT. constant_diffusion ) THEN
868
869	!
870	!-- Determine surface fluxes shf and qsws and surface values
871	!-- pt_surface and q_surface in dependence on data from external
872	!-- file LSF_DATA respectively
873	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
874	intermediate_timestep_count == intermediate_timestep_count_max )&
875	THEN
876	CALL ls_forcing_surf ( simulated_time )
877	ENDIF
878
879	!
880	!-- First the vertical fluxes in the surface (constant flux) layer are computed
881	IF ( constant_flux_layer ) THEN
882	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
883	CALL surface_layer_fluxes
884	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
885	ENDIF
886
887	!
888	!-- If required, solve the energy balance for the surface and run soil
889	!-- model
890	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
891
892	CALL cpu_log( log_point(54), 'land_surface', 'start' )
893	CALL lsm_energy_balance
894	CALL lsm_soil_model
895	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
896	ENDIF
897
898	!
899	!-- If required, solve the energy balance for urban surfaces and run
900	!-- the material heat model
901	IF (urban_surface) THEN
902	CALL cpu_log( log_point(74), 'urban_surface', 'start' )
903	CALL usm_surface_energy_balance
904	IF ( usm_material_model ) THEN
905	CALL usm_material_heat_model
906	ENDIF
907	CALL cpu_log( log_point(74), 'urban_surface', 'stop' )
908	ENDIF
909
910	!
911	!-- Compute the diffusion coefficients
912	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
913	IF ( .NOT. humidity ) THEN
914	IF ( ocean ) THEN
915	CALL diffusivities( prho, prho_reference )
916	ELSE
917	CALL diffusivities( pt, pt_reference )
918	ENDIF
919	ELSE
920	CALL diffusivities( vpt, pt_reference )
921	ENDIF
922	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
923
924	ENDIF
925
926	!
927	!-- If required, calculate radiative fluxes and heating rates
928	IF ( radiation .AND. intermediate_timestep_count &
929	== intermediate_timestep_count_max .AND. simulated_time > &
930	skip_time_do_radiation ) THEN
931
932	time_radiation = time_radiation + dt_3d
933
934	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
935	THEN
936
937	CALL cpu_log( log_point(50), 'radiation', 'start' )
938
939	IF ( .NOT. force_radiation_call ) THEN
940	time_radiation = time_radiation - dt_radiation
941	ENDIF
942
943	CALL radiation_control
944
945	CALL cpu_log( log_point(50), 'radiation', 'stop' )
946
947	IF (urban_surface) THEN
948	CALL cpu_log( log_point(75), 'usm_radiation', 'start' )
949	CALL usm_radiation
950	CALL cpu_log( log_point(75), 'usm_radiation', 'stop' )
951	ENDIF
952
953	ENDIF
954	ENDIF
955
956	ENDDO ! Intermediate step loop
957
958	!
959	!-- Increase simulation time and output times
960	nr_timesteps_this_run = nr_timesteps_this_run + 1
961	current_timestep_number = current_timestep_number + 1
962	simulated_time = simulated_time + dt_3d
963	simulated_time_chr = time_to_string( simulated_time )
964	time_since_reference_point = simulated_time - coupling_start_time
965
966
967
968	IF ( simulated_time >= skip_time_data_output_av ) THEN
969	time_do_av = time_do_av + dt_3d
970	ENDIF
971	IF ( simulated_time >= skip_time_do2d_xy ) THEN
972	time_do2d_xy = time_do2d_xy + dt_3d
973	ENDIF
974	IF ( simulated_time >= skip_time_do2d_xz ) THEN
975	time_do2d_xz = time_do2d_xz + dt_3d
976	ENDIF
977	IF ( simulated_time >= skip_time_do2d_yz ) THEN
978	time_do2d_yz = time_do2d_yz + dt_3d
979	ENDIF
980	IF ( simulated_time >= skip_time_do3d ) THEN
981	time_do3d = time_do3d + dt_3d
982	ENDIF
983	DO mid = 1, masks
984	IF ( simulated_time >= skip_time_domask(mid) ) THEN
985	time_domask(mid)= time_domask(mid) + dt_3d
986	ENDIF
987	ENDDO
988	time_dvrp = time_dvrp + dt_3d
989	IF ( simulated_time >= skip_time_dosp ) THEN
990	time_dosp = time_dosp + dt_3d
991	ENDIF
992	time_dots = time_dots + dt_3d
993	IF ( .NOT. first_call_lpm ) THEN
994	time_dopts = time_dopts + dt_3d
995	ENDIF
996	IF ( simulated_time >= skip_time_dopr ) THEN
997	time_dopr = time_dopr + dt_3d
998	ENDIF
999	time_dopr_listing = time_dopr_listing + dt_3d
1000	time_run_control = time_run_control + dt_3d
1001
1002	!
1003	!-- Data exchange between coupled models
1004	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
1005	time_coupling = time_coupling + dt_3d
1006
1007	!
1008	!-- In case of model termination initiated by the local model
1009	!-- (terminate_coupled > 0), the coupler must be skipped because it would
1010	!-- cause an MPI intercomminucation hang.
1011	!-- If necessary, the coupler will be called at the beginning of the
1012	!-- next restart run.
1013	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
1014	CALL surface_coupler
1015	time_coupling = time_coupling - dt_coupling
1016	ENDDO
1017	ENDIF
1018
1019	!
1020	!-- Execute user-defined actions
1021	CALL user_actions( 'after_integration' )
1022
1023	!
1024	!-- If Galilei transformation is used, determine the distance that the
1025	!-- model has moved so far
1026	IF ( galilei_transformation ) THEN
1027	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
1028	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
1029	ENDIF
1030
1031	!
1032	!-- Check, if restart is necessary (because cpu-time is expiring or
1033	!-- because it is forced by user) and set stop flag
1034	!-- This call is skipped if the remote model has already initiated a restart.
1035	IF ( .NOT. terminate_run ) CALL check_for_restart
1036
1037	!
1038	!-- Carry out statistical analysis and output at the requested output times.
1039	!-- The MOD function is used for calculating the output time counters (like
1040	!-- time_dopr) in order to regard a possible decrease of the output time
1041	!-- interval in case of restart runs
1042
1043	!
1044	!-- Set a flag indicating that so far no statistics have been created
1045	!-- for this time step
1046	flow_statistics_called = .FALSE.
1047
1048	!
1049	!-- If required, call flow_statistics for averaging in time
1050	IF ( averaging_interval_pr /= 0.0_wp .AND. &
1051	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
1052	simulated_time >= skip_time_dopr ) THEN
1053	time_dopr_av = time_dopr_av + dt_3d
1054	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
1055	do_sum = .TRUE.
1056	time_dopr_av = MOD( time_dopr_av, &
1057	MAX( dt_averaging_input_pr, dt_3d ) )
1058	ENDIF
1059	ENDIF
1060	IF ( do_sum ) CALL flow_statistics
1061
1062	!
1063	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1064	IF ( averaging_interval /= 0.0_wp .AND. &
1065	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1066	simulated_time >= skip_time_data_output_av ) &
1067	THEN
1068	time_do_sla = time_do_sla + dt_3d
1069	IF ( time_do_sla >= dt_averaging_input ) THEN
1070	CALL sum_up_3d_data
1071	average_count_3d = average_count_3d + 1
1072	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1073	ENDIF
1074	ENDIF
1075
1076	!
1077	!-- Calculate spectra for time averaging
1078	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1079	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1080	simulated_time >= skip_time_dosp ) THEN
1081	time_dosp_av = time_dosp_av + dt_3d
1082	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1083	CALL calc_spectra
1084	time_dosp_av = MOD( time_dosp_av, &
1085	MAX( dt_averaging_input_pr, dt_3d ) )
1086	ENDIF
1087	ENDIF
1088
1089	!
1090	!-- Call flight module and output data
1091	IF ( virtual_flight ) THEN
1092	CALL flight_measurement
1093	CALL data_output_flight
1094	ENDIF
1095
1096	!
1097	!-- Profile output (ASCII) on file
1098	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1099	CALL print_1d
1100	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1101	dt_3d ) )
1102	ENDIF
1103
1104	!
1105	!-- Graphic output for PROFIL
1106	IF ( time_dopr >= dt_dopr ) THEN
1107	IF ( dopr_n /= 0 ) CALL data_output_profiles
1108	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1109	time_dopr_av = 0.0_wp ! due to averaging (see above)
1110	ENDIF
1111
1112	!
1113	!-- Graphic output for time series
1114	IF ( time_dots >= dt_dots ) THEN
1115	CALL data_output_tseries
1116	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1117	ENDIF
1118
1119	!
1120	!-- Output of spectra (formatted for use with PROFIL), in case of no
1121	!-- time averaging, spectra has to be calculated before
1122	IF ( time_dosp >= dt_dosp ) THEN
1123	IF ( average_count_sp == 0 ) CALL calc_spectra
1124	CALL data_output_spectra
1125	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1126	ENDIF
1127
1128	!
1129	!-- 2d-data output (cross-sections)
1130	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1131	CALL data_output_2d( 'xy', 0 )
1132	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1133	ENDIF
1134	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1135	CALL data_output_2d( 'xz', 0 )
1136	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1137	ENDIF
1138	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1139	CALL data_output_2d( 'yz', 0 )
1140	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1141	ENDIF
1142
1143	!
1144	!-- 3d-data output (volume data)
1145	IF ( time_do3d >= dt_do3d ) THEN
1146	CALL data_output_3d( 0 )
1147	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1148	ENDIF
1149
1150	!
1151	!-- Masked data output
1152	DO mid = 1, masks
1153	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1154	CALL data_output_mask( 0 )
1155	time_domask(mid) = MOD( time_domask(mid), &
1156	MAX( dt_domask(mid), dt_3d ) )
1157	ENDIF
1158	ENDDO
1159
1160	!
1161	!-- Output of time-averaged 2d/3d/masked data
1162	IF ( time_do_av >= dt_data_output_av ) THEN
1163	CALL average_3d_data
1164	CALL data_output_2d( 'xy', 1 )
1165	CALL data_output_2d( 'xz', 1 )
1166	CALL data_output_2d( 'yz', 1 )
1167	CALL data_output_3d( 1 )
1168	DO mid = 1, masks
1169	CALL data_output_mask( 1 )
1170	ENDDO
1171	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1172	ENDIF
1173
1174	!
1175	!-- Output of particle time series
1176	IF ( particle_advection ) THEN
1177	IF ( time_dopts >= dt_dopts .OR. &
1178	( simulated_time >= particle_advection_start .AND. &
1179	first_call_lpm ) ) THEN
1180	CALL data_output_ptseries
1181	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1182	ENDIF
1183	ENDIF
1184
1185	!
1186	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1187	#if defined( __dvrp_graphics )
1188	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1189	#endif
1190	IF ( time_dvrp >= dt_dvrp ) THEN
1191	CALL data_output_dvrp
1192	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1193	ENDIF
1194	#if defined( __dvrp_graphics )
1195	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1196	#endif
1197
1198	!
1199	!-- If required, set the heat flux for the next time step at a random value
1200	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1201
1202	!
1203	!-- Execute user-defined actions
1204	CALL user_actions( 'after_timestep' )
1205
1206	!
1207	!-- Determine size of next time step. Save timestep dt_3d because it is
1208	!-- newly calculated in routine timestep, but required further below for
1209	!-- steering the run control output interval
1210	dt_3d_old = dt_3d
1211	CALL timestep
1212
1213	!
1214	!-- Synchronize the timestep in case of nested run.
1215	IF ( nested_run ) THEN
1216	!
1217	!-- Synchronize by unifying the time step.
1218	!-- Global minimum of all time-steps is used for all.
1219	CALL pmci_synchronize
1220	ENDIF
1221
1222	!
1223	!-- Computation and output of run control parameters.
1224	!-- This is also done whenever perturbations have been imposed
1225	IF ( time_run_control >= dt_run_control .OR. &
1226	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1227	THEN
1228	CALL run_control
1229	IF ( time_run_control >= dt_run_control ) THEN
1230	time_run_control = MOD( time_run_control, &
1231	MAX( dt_run_control, dt_3d_old ) )
1232	ENDIF
1233	ENDIF
1234
1235	!
1236	!-- Output elapsed simulated time in form of a progress bar on stdout
1237	IF ( myid == 0 ) CALL output_progress_bar
1238
1239	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1240
1241
1242	ENDDO ! time loop
1243
1244	IF ( myid == 0 ) CALL finish_progress_bar
1245
1246	#if defined( __dvrp_graphics )
1247	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1248	#endif
1249
1250	CALL location_message( 'finished time-stepping', .TRUE. )
1251
1252	END SUBROUTINE time_integration

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