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source: palm/trunk/SOURCE/time_integration.f90 @ 2007

Last change on this file since 2007 was 2007, checked in by kanani, 8 years ago
changes in the course of urban surface model implementation
Property svn:keywords set to `Id`
File size: 47.7 KB

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1	!> @file time_integration.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
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	! Added CALLs for new urban surface model
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: time_integration.f90 2007 2016-08-24 15:47:17Z kanani $
27	!
28	! 2000 2016-08-20 18:09:15Z knoop
29	! Forced header and separation lines into 80 columns
30	!
31	! 1976 2016-07-27 13:28:04Z maronga
32	! Simplified calls to radiation model
33	!
34	! 1960 2016-07-12 16:34:24Z suehring
35	! Separate humidity and passive scalar
36	!
37	! 1957 2016-07-07 10:43:48Z suehring
38	! flight module added
39	!
40	! 1919 2016-05-27 14:51:23Z raasch
41	! Initial version of purely vertical nesting introduced.
42	!
43	! 1918 2016-05-27 14:35:57Z raasch
44	! determination of time step moved to the end of the time step loop,
45	! the first time step is now always calculated before the time step loop (i.e.
46	! also in case of restart runs)
47	!
48	! 1914 2016-05-26 14:44:07Z witha
49	! Added call for wind turbine model
50	!
51	! 1878 2016-04-19 12:30:36Z hellstea
52	! Synchronization for nested runs rewritten
53	!
54	! 1853 2016-04-11 09:00:35Z maronga
55	! Adjusted for use with radiation_scheme = constant
56	!
57	! 1849 2016-04-08 11:33:18Z hoffmann
58	! Adapted for modularization of microphysics
59	!
60	! 1833 2016-04-07 14:23:03Z raasch
61	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
62	!
63	! 1831 2016-04-07 13:15:51Z hoffmann
64	! turbulence renamed collision_turbulence
65	!
66	! 1822 2016-04-07 07:49:42Z hoffmann
67	! icloud_scheme replaced by microphysics_*
68	!
69	! 1808 2016-04-05 19:44:00Z raasch
70	! output message in case unscheduled radiation calls removed
71	!
72	! 1797 2016-03-21 16:50:28Z raasch
73	! introduction of different datatransfer modes
74	!
75	! 1791 2016-03-11 10:41:25Z raasch
76	! call of pmci_update_new removed
77	!
78	! 1786 2016-03-08 05:49:27Z raasch
79	! +module spectrum
80	!
81	! 1783 2016-03-06 18:36:17Z raasch
82	! switch back of netcdf data format for mask output moved to the mask output
83	! routine
84	!
85	! 1781 2016-03-03 15:12:23Z raasch
86	! some pmc calls removed at the beginning (before timeloop),
87	! pmc initialization moved to the main program
88	!
89	! 1764 2016-02-28 12:45:19Z raasch
90	! PMC_ACTIVE flags removed,
91	! bugfix: nest synchronization after first call of timestep
92	!
93	! 1762 2016-02-25 12:31:13Z hellstea
94	! Introduction of nested domain feature
95	!
96	! 1736 2015-12-04 08:56:33Z raasch
97	! no perturbations added to total domain if energy limit has been set zero
98	!
99	! 1691 2015-10-26 16:17:44Z maronga
100	! Added option for spin-ups without land surface and radiation models. Moved calls
101	! for radiation and lan surface schemes.
102	!
103	! 1682 2015-10-07 23:56:08Z knoop
104	! Code annotations made doxygen readable
105	!
106	! 1671 2015-09-25 03:29:37Z raasch
107	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
108	! for particles
109	!
110	! 1585 2015-04-30 07:05:52Z maronga
111	! Moved call of radiation scheme. Added support for RRTM
112	!
113	! 1551 2015-03-03 14:18:16Z maronga
114	! Added interface for different radiation schemes.
115	!
116	! 1496 2014-12-02 17:25:50Z maronga
117	! Added calls for the land surface model and radiation scheme
118	!
119	! 1402 2014-05-09 14:25:13Z raasch
120	! location messages modified
121	!
122	! 1384 2014-05-02 14:31:06Z raasch
123	! location messages added
124	!
125	! 1380 2014-04-28 12:40:45Z heinze
126	! CALL of nudge_ref added
127	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
128	!
129	! 1365 2014-04-22 15:03:56Z boeske
130	! Reset sums_ls_l to zero at each timestep
131	! +sums_ls_l
132	! Calculation of reference state (previously in subroutine calc_mean_profile)
133
134	! 1342 2014-03-26 17:04:47Z kanani
135	! REAL constants defined as wp-kind
136	!
137	! 1320 2014-03-20 08:40:49Z raasch
138	! ONLY-attribute added to USE-statements,
139	! kind-parameters added to all INTEGER and REAL declaration statements,
140	! kinds are defined in new module kinds,
141	! old module precision_kind is removed,
142	! revision history before 2012 removed,
143	! comment fields (!:) to be used for variable explanations added to
144	! all variable declaration statements
145	! 1318 2014-03-17 13:35:16Z raasch
146	! module interfaces removed
147	!
148	! 1308 2014-03-13 14:58:42Z fricke
149	! +netcdf_data_format_save
150	! For masked data, parallel netcdf output is not tested so far, hence
151	! netcdf_data_format is switched back to non-paralell output.
152	!
153	! 1276 2014-01-15 13:40:41Z heinze
154	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
155	!
156	! 1257 2013-11-08 15:18:40Z raasch
157	! acc-update-host directive for timestep removed
158	!
159	! 1241 2013-10-30 11:36:58Z heinze
160	! Generalize calc_mean_profile for wider use
161	! Determine shf and qsws in dependence on data from LSF_DATA
162	! Determine ug and vg in dependence on data from LSF_DATA
163	! 1221 2013-09-10 08:59:13Z raasch
164	! host update of arrays before timestep is called
165	!
166	! 1179 2013-06-14 05:57:58Z raasch
167	! mean profiles for reference state are only calculated if required,
168	! small bugfix for background communication
169	!
170	! 1171 2013-05-30 11:27:45Z raasch
171	! split of prognostic_equations deactivated (comment lines), for the time being
172	!
173	! 1128 2013-04-12 06:19:32Z raasch
174	! asynchronous transfer of ghost point data realized for acc-optimized version:
175	! prognostic_equations are first called two times for those points required for
176	! the left-right and north-south exchange, respectively, and then for the
177	! remaining points,
178	! those parts requiring global communication moved from prognostic_equations to
179	! here
180	!
181	! 1115 2013-03-26 18:16:16Z hoffmann
182	! calculation of qr and nr is restricted to precipitation
183	!
184	! 1113 2013-03-10 02:48:14Z raasch
185	! GPU-porting of boundary conditions,
186	! openACC directives updated
187	! formal parameter removed from routine boundary_conds
188	!
189	! 1111 2013-03-08 23:54:10Z raasch
190	! +internal timestep counter for cpu statistics added,
191	! openACC directives updated
192	!
193	! 1092 2013-02-02 11:24:22Z raasch
194	! unused variables removed
195	!
196	! 1065 2012-11-22 17:42:36Z hoffmann
197	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
198	!
199	! 1053 2012-11-13 17:11:03Z hoffmann
200	! exchange of ghost points for nr, qr added
201	!
202	! 1036 2012-10-22 13:43:42Z raasch
203	! code put under GPL (PALM 3.9)
204	!
205	! 1019 2012-09-28 06:46:45Z raasch
206	! non-optimized version of prognostic_equations removed
207	!
208	! 1015 2012-09-27 09:23:24Z raasch
209	! +call of prognostic_equations_acc
210	!
211	! 1001 2012-09-13 14:08:46Z raasch
212	! all actions concerning leapfrog- and upstream-spline-scheme removed
213	!
214	! 849 2012-03-15 10:35:09Z raasch
215	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
216	!
217	! 825 2012-02-19 03:03:44Z raasch
218	! wang_collision_kernel renamed wang_kernel
219	!
220	! Revision 1.1 1997/08/11 06:19:04 raasch
221	! Initial revision
222	!
223	!
224	! Description:
225	! ------------
226	!> Integration in time of the model equations, statistical analysis and graphic
227	!> output
228	!------------------------------------------------------------------------------!
229	SUBROUTINE time_integration
230
231
232	USE advec_ws, &
233	ONLY: ws_statistics
234
235	USE arrays_3d, &
236	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
237	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, s, s_p, sa_p, &
238	tend, u, u_p, v, vpt, v_p, w, w_p
239
240	USE calc_mean_profile_mod, &
241	ONLY: calc_mean_profile
242
243	USE control_parameters, &
244	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
245	averaging_interval, averaging_interval_pr, &
246	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
247	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
248	cloud_physics, constant_flux_layer, constant_heatflux, &
249	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
250	coupling_start_time, current_timestep_number, &
251	disturbance_created, disturbance_energy_limit, dist_range, &
252	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
253	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
254	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
255	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
256	end_time, first_call_lpm, galilei_transformation, humidity, &
257	intermediate_timestep_count, &
258	intermediate_timestep_count_max, large_scale_forcing, &
259	loop_optimization, lsf_surf, lsf_vert, masks, &
260	microphysics_seifert, mid, nest_domain, &
261	neutral, nr_timesteps_this_run, nudging, &
262	ocean, on_device, passive_scalar, &
263	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
264	run_coupled, simulated_time, simulated_time_chr, &
265	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
266	skip_time_do3d, skip_time_domask, skip_time_dopr, &
267	skip_time_data_output_av, sloping_surface, &
268	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
269	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
270	time_do3d, time_domask, time_dopr, time_dopr_av, &
271	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
272	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
273	time_run_control, time_since_reference_point, &
274	turbulent_inflow, use_initial_profile_as_reference, &
275	use_single_reference_value, u_gtrans, v_gtrans, virtual_flight, &
276	ws_scheme_mom, ws_scheme_sca
277
278	USE cpulog, &
279	ONLY: cpu_log, log_point, log_point_s
280
281	USE flight_mod, &
282	ONLY: flight_measurement
283
284
285	USE indices, &
286	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
287	nxrg, nyn, nyng, nys, nysg, nzb, nzt, nzb_u_inner, nzb_v_inner
288
289	USE interaction_droplets_ptq_mod, &
290	ONLY: interaction_droplets_ptq
291
292	USE interfaces
293
294	USE kinds
295
296	USE land_surface_model_mod, &
297	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
298	skip_time_do_lsm
299
300	USE ls_forcing_mod, &
301	ONLY: ls_forcing_surf, ls_forcing_vert
302
303	USE microphysics_mod, &
304	ONLY: collision_turbulence
305
306	USE nudge_mod, &
307	ONLY: calc_tnudge, nudge_ref
308
309	USE particle_attributes, &
310	ONLY: particle_advection, particle_advection_start, &
311	use_sgs_for_particles, wang_kernel
312
313	USE pegrid
314
315	USE pmc_interface, &
316	ONLY: nested_run, nesting_mode, pmci_datatrans, &
317	pmci_ensure_nest_mass_conservation, pmci_synchronize
318
319	USE production_e_mod, &
320	ONLY: production_e_init
321
322	USE progress_bar, &
323	ONLY: finish_progress_bar, output_progress_bar
324
325	USE prognostic_equations_mod, &
326	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
327	prognostic_equations_vector
328
329	USE radiation_model_mod, &
330	ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
331	skip_time_do_radiation, time_radiation
332
333	USE spectra_mod, &
334	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
335	skip_time_dosp
336
337	USE statistics, &
338	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l, u_max, &
339	u_max_ijk, v_max, v_max_ijk, w_max, w_max_ijk
340
341	USE surface_layer_fluxes_mod, &
342	ONLY: surface_layer_fluxes
343
344	USE urban_surface_mod, &
345	ONLY: urban_surface, usm_material_heat_model, usm_material_model, &
346	usm_radiation, usm_surface_energy_balance
347
348	USE user_actions_mod, &
349	ONLY: user_actions
350
351	USE wind_turbine_model_mod, &
352	ONLY: wind_turbine, wtm_forces
353
354	IMPLICIT NONE
355
356	CHARACTER (LEN=9) :: time_to_string !<
357
358	REAL(wp) :: dt_3d_old !< temporary storage of timestep to be used for
359	!< steering of run control output interval
360
361	!
362	!-- At beginning determine the first time step
363	CALL timestep
364
365	!
366	!-- Synchronize the timestep in case of nested run.
367	IF ( nested_run ) THEN
368	!
369	!-- Synchronization by unifying the time step.
370	!-- Global minimum of all time-steps is used for all.
371	CALL pmci_synchronize
372	ENDIF
373
374	!
375	!-- Determine and print out the run control quantities before the first time
376	!-- step of this run. For the initial run, some statistics (e.g. divergence)
377	!-- need to be determined first.
378	IF ( simulated_time == 0.0_wp ) CALL flow_statistics
379	CALL run_control
380
381	!
382	!-- Data exchange between coupled models in case that a call has been omitted
383	!-- at the end of the previous run of a job chain.
384	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
385	!
386	!-- In case of model termination initiated by the local model the coupler
387	!-- must not be called because this would again cause an MPI hang.
388	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
389	CALL surface_coupler
390	time_coupling = time_coupling - dt_coupling
391	ENDDO
392	IF (time_coupling == 0.0_wp .AND. &
393	time_since_reference_point < dt_coupling ) &
394	THEN
395	time_coupling = time_since_reference_point
396	ENDIF
397	ENDIF
398
399	#if defined( __dvrp_graphics )
400	!
401	!-- Time measurement with dvrp software
402	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
403	#endif
404
405	CALL location_message( 'start with time-stepping', .TRUE. )
406	!
407	!-- Start of the time loop
408	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
409	.NOT. terminate_run )
410
411	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
412
413	!
414	!-- Determine ug, vg and w_subs in dependence on data from external file
415	!-- LSF_DATA
416	IF ( large_scale_forcing .AND. lsf_vert ) THEN
417	CALL ls_forcing_vert ( simulated_time )
418	sums_ls_l = 0.0_wp
419	ENDIF
420
421	!
422	!-- Set pt_init and q_init to the current profiles taken from
423	!-- NUDGING_DATA
424	IF ( nudging ) THEN
425	CALL nudge_ref ( simulated_time )
426	!
427	!-- Store temperature gradient at the top boundary for possible Neumann
428	!-- boundary condition
429	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
430	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
431	ENDIF
432
433	!
434	!-- Execute the user-defined actions
435	CALL user_actions( 'before_timestep' )
436
437	!
438	!-- Calculate forces by wind turbines
439	IF ( wind_turbine ) THEN
440
441	CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
442
443	CALL wtm_forces
444
445	CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
446
447	ENDIF
448
449	!
450	!-- Start of intermediate step loop
451	intermediate_timestep_count = 0
452	DO WHILE ( intermediate_timestep_count < &
453	intermediate_timestep_count_max )
454
455	intermediate_timestep_count = intermediate_timestep_count + 1
456
457	!
458	!-- Set the steering factors for the prognostic equations which depend
459	!-- on the timestep scheme
460	CALL timestep_scheme_steering
461
462	!
463	!-- Calculate those variables needed in the tendency terms which need
464	!-- global communication
465	IF ( .NOT. use_single_reference_value .AND. &
466	.NOT. use_initial_profile_as_reference ) THEN
467	!
468	!-- Horizontally averaged profiles to be used as reference state in
469	!-- buoyancy terms (WARNING: only the respective last call of
470	!-- calc_mean_profile defines the reference state!)
471	IF ( .NOT. neutral ) THEN
472	CALL calc_mean_profile( pt, 4 )
473	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
474	ENDIF
475	IF ( ocean ) THEN
476	CALL calc_mean_profile( rho, 64 )
477	ref_state(:) = hom(:,1,64,0)
478	ENDIF
479	IF ( humidity ) THEN
480	CALL calc_mean_profile( vpt, 44 )
481	ref_state(:) = hom(:,1,44,0)
482	ENDIF
483
484	ENDIF
485
486	IF ( .NOT. constant_diffusion ) CALL production_e_init
487	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
488	intermediate_timestep_count == 1 ) CALL ws_statistics
489	!
490	!-- In case of nudging calculate current nudging time scale and horizontal
491	!-- means of u, v, pt and q
492	IF ( nudging ) THEN
493	CALL calc_tnudge( simulated_time )
494	CALL calc_mean_profile( u, 1 )
495	CALL calc_mean_profile( v, 2 )
496	CALL calc_mean_profile( pt, 4 )
497	CALL calc_mean_profile( q, 41 )
498	ENDIF
499
500	!
501	!-- Solve the prognostic equations. A fast cache optimized version with
502	!-- only one single loop is used in case of Piascek-Williams advection
503	!-- scheme. NEC vector machines use a different version, because
504	!-- in the other versions a good vectorization is prohibited due to
505	!-- inlining problems.
506	IF ( loop_optimization == 'cache' ) THEN
507	CALL prognostic_equations_cache
508	ELSEIF ( loop_optimization == 'vector' ) THEN
509	CALL prognostic_equations_vector
510	ELSEIF ( loop_optimization == 'acc' ) THEN
511	i_left = nxl; i_right = nxr
512	j_south = nys; j_north = nyn
513	CALL prognostic_equations_acc
514
515	! i_left = nxl; i_right = nxl+nbgp-1
516	! j_south = nys; j_north = nyn
517	! CALL prognostic_equations_acc
518	! i_left = nxr-nbgp+1; i_right = nxr
519	! j_south = nys; j_north = nyn
520	! CALL prognostic_equations_acc
521
522	!
523	!-- Exchange of ghost points (lateral boundary conditions)
524	IF ( background_communication ) THEN
525
526	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
527
528	send_receive = 'lr'
529	sendrecv_in_background = .TRUE.
530	req = 0
531	req_count = 0
532
533	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
534	on_device = .TRUE. ! to be removed after complete porting
535	ELSE ! of ghost point exchange
536	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
537	ENDIF
538
539	CALL exchange_horiz( u_p, nbgp )
540	CALL exchange_horiz( v_p, nbgp )
541	CALL exchange_horiz( w_p, nbgp )
542	CALL exchange_horiz( pt_p, nbgp )
543	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
544	IF ( ocean ) THEN
545	CALL exchange_horiz( sa_p, nbgp )
546	CALL exchange_horiz( rho, nbgp )
547	CALL exchange_horiz( prho, nbgp )
548	ENDIF
549	IF ( humidity ) THEN
550	CALL exchange_horiz( q_p, nbgp )
551	IF ( cloud_physics .AND. microphysics_seifert ) THEN
552	CALL exchange_horiz( qr_p, nbgp )
553	CALL exchange_horiz( nr_p, nbgp )
554	ENDIF
555	ENDIF
556	IF ( cloud_droplets ) THEN
557	CALL exchange_horiz( ql, nbgp )
558	CALL exchange_horiz( ql_c, nbgp )
559	CALL exchange_horiz( ql_v, nbgp )
560	CALL exchange_horiz( ql_vp, nbgp )
561	ENDIF
562	IF ( wang_kernel .OR. collision_turbulence .OR. &
563	use_sgs_for_particles ) THEN
564	CALL exchange_horiz( diss, nbgp )
565	ENDIF
566	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
567
568	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
569	on_device = .FALSE. ! to be removed after complete porting
570	ELSE ! of ghost point exchange
571	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
572	ENDIF
573
574	sendrecv_in_background = .FALSE.
575
576	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
577
578	ENDIF
579
580	! i_left = nxl+nbgp; i_right = nxr-nbgp
581	! j_south = nys; j_north = nys+nbgp-1
582	! CALL prognostic_equations_acc
583	! i_left = nxl+nbgp; i_right = nxr-nbgp
584	! j_south = nyn-nbgp+1; j_north = nyn
585	! CALL prognostic_equations_acc
586
587	IF ( background_communication ) THEN
588	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
589	#if defined( __parallel )
590	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
591	#endif
592	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
593
594	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
595
596	send_receive = 'ns'
597	sendrecv_in_background = .TRUE.
598	req = 0
599	req_count = 0
600
601	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
602	on_device = .TRUE. ! to be removed after complete porting
603	ELSE ! of ghost point exchange
604	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
605	ENDIF
606
607	CALL exchange_horiz( u_p, nbgp )
608	CALL exchange_horiz( v_p, nbgp )
609	CALL exchange_horiz( w_p, nbgp )
610	CALL exchange_horiz( pt_p, nbgp )
611	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
612	IF ( ocean ) THEN
613	CALL exchange_horiz( sa_p, nbgp )
614	CALL exchange_horiz( rho, nbgp )
615	CALL exchange_horiz( prho, nbgp )
616	ENDIF
617	IF ( humidity ) THEN
618	CALL exchange_horiz( q_p, nbgp )
619	IF ( cloud_physics .AND. microphysics_seifert ) THEN
620	CALL exchange_horiz( qr_p, nbgp )
621	CALL exchange_horiz( nr_p, nbgp )
622	ENDIF
623	ENDIF
624	IF ( cloud_droplets ) THEN
625	CALL exchange_horiz( ql, nbgp )
626	CALL exchange_horiz( ql_c, nbgp )
627	CALL exchange_horiz( ql_v, nbgp )
628	CALL exchange_horiz( ql_vp, nbgp )
629	ENDIF
630	IF ( wang_kernel .OR. collision_turbulence .OR. &
631	use_sgs_for_particles ) THEN
632	CALL exchange_horiz( diss, nbgp )
633	ENDIF
634	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
635
636	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
637	on_device = .FALSE. ! to be removed after complete porting
638	ELSE ! of ghost point exchange
639	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
640	ENDIF
641
642	sendrecv_in_background = .FALSE.
643
644	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
645
646	ENDIF
647
648	! i_left = nxl+nbgp; i_right = nxr-nbgp
649	! j_south = nys+nbgp; j_north = nyn-nbgp
650	! CALL prognostic_equations_acc
651
652	IF ( background_communication ) THEN
653	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
654	#if defined( __parallel )
655	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
656	#endif
657	send_receive = 'al'
658	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
659	ENDIF
660
661	ENDIF
662
663	!
664	!-- Particle transport/physics with the Lagrangian particle model
665	!-- (only once during intermediate steps, because it uses an Euler-step)
666	!-- ### particle model should be moved before prognostic_equations, in order
667	!-- to regard droplet interactions directly
668	IF ( particle_advection .AND. &
669	simulated_time >= particle_advection_start .AND. &
670	intermediate_timestep_count == 1 ) THEN
671	CALL lpm
672	first_call_lpm = .FALSE.
673	ENDIF
674
675	!
676	!-- Interaction of droplets with temperature and specific humidity.
677	!-- Droplet condensation and evaporation is calculated within
678	!-- advec_particles.
679	IF ( cloud_droplets .AND. &
680	intermediate_timestep_count == intermediate_timestep_count_max )&
681	THEN
682	CALL interaction_droplets_ptq
683	ENDIF
684
685	!
686	!-- Exchange of ghost points (lateral boundary conditions)
687	IF ( .NOT. background_communication ) THEN
688
689	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
690
691	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
692	on_device = .TRUE. ! to be removed after complete porting
693	ELSE ! of ghost point exchange
694	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
695	ENDIF
696
697	CALL exchange_horiz( u_p, nbgp )
698	CALL exchange_horiz( v_p, nbgp )
699	CALL exchange_horiz( w_p, nbgp )
700	CALL exchange_horiz( pt_p, nbgp )
701	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
702	IF ( ocean ) THEN
703	CALL exchange_horiz( sa_p, nbgp )
704	CALL exchange_horiz( rho, nbgp )
705	CALL exchange_horiz( prho, nbgp )
706	ENDIF
707	IF ( humidity ) THEN
708	CALL exchange_horiz( q_p, nbgp )
709	IF ( cloud_physics .AND. microphysics_seifert ) THEN
710	CALL exchange_horiz( qr_p, nbgp )
711	CALL exchange_horiz( nr_p, nbgp )
712	ENDIF
713	ENDIF
714	IF ( cloud_droplets ) THEN
715	CALL exchange_horiz( ql, nbgp )
716	CALL exchange_horiz( ql_c, nbgp )
717	CALL exchange_horiz( ql_v, nbgp )
718	CALL exchange_horiz( ql_vp, nbgp )
719	ENDIF
720	IF ( wang_kernel .OR. collision_turbulence .OR. &
721	use_sgs_for_particles ) THEN
722	CALL exchange_horiz( diss, nbgp )
723	ENDIF
724	IF ( passive_scalar ) CALL exchange_horiz( s_p, nbgp )
725
726	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
727	on_device = .FALSE. ! to be removed after complete porting
728	ELSE ! of ghost point exchange
729	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
730	ENDIF
731
732	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
733
734	ENDIF
735
736	!
737	!-- Boundary conditions for the prognostic quantities (except of the
738	!-- velocities at the outflow in case of a non-cyclic lateral wall)
739	CALL boundary_conds
740
741	!
742	!-- Swap the time levels in preparation for the next time step.
743	CALL swap_timelevel
744
745	IF ( nested_run ) THEN
746
747	CALL cpu_log( log_point(60), 'nesting', 'start' )
748	!
749	!-- Domain nesting. The data transfer subroutines pmci_parent_datatrans
750	!-- and pmci_child_datatrans are called inside the wrapper
751	!-- subroutine pmci_datatrans according to the control parameters
752	!-- nesting_mode and nesting_datatransfer_mode.
753	!-- TO_DO: why is nesting_mode given as a parameter here?
754	CALL pmci_datatrans( nesting_mode )
755
756	IF ( TRIM( nesting_mode ) == 'two-way' .OR. &
757	nesting_mode == 'vertical' ) THEN
758	!
759	!-- Exchange_horiz is needed for all parent-domains after the
760	!-- anterpolation
761	CALL exchange_horiz( u, nbgp )
762	CALL exchange_horiz( v, nbgp )
763	CALL exchange_horiz( w, nbgp )
764	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
765	IF ( humidity ) CALL exchange_horiz( q, nbgp )
766	IF ( passive_scalar ) CALL exchange_horiz( s, nbgp )
767	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
768	ENDIF
769	!
770	!-- Correct the w top-BC in nest domains to ensure mass conservation.
771	!-- This action must never be done for the root domain. Vertical
772	!-- nesting implies mass conservation.
773	IF ( nest_domain ) THEN
774	CALL pmci_ensure_nest_mass_conservation
775	ENDIF
776
777	CALL cpu_log( log_point(60), 'nesting', 'stop' )
778
779	ENDIF
780
781	!
782	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
783	!-- when a sloping surface is used
784	IF ( sloping_surface ) THEN
785	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
786	pt_slope_offset
787	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
788	pt_slope_offset
789	ENDIF
790
791	!
792	!-- Impose a turbulent inflow using the recycling method
793	IF ( turbulent_inflow ) CALL inflow_turbulence
794
795	!
796	!-- Impose a random perturbation on the horizontal velocity field
797	IF ( create_disturbances .AND. &
798	( call_psolver_at_all_substeps .AND. &
799	intermediate_timestep_count == intermediate_timestep_count_max )&
800	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
801	intermediate_timestep_count == 1 ) ) &
802	THEN
803	time_disturb = time_disturb + dt_3d
804	IF ( time_disturb >= dt_disturb ) THEN
805	!$acc update host( u, v )
806	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
807	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
808	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
809	CALL disturb_field( nzb_u_inner, tend, u )
810	CALL disturb_field( nzb_v_inner, tend, v )
811	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
812	!
813	!-- Runs with a non-cyclic lateral wall need perturbations
814	!-- near the inflow throughout the whole simulation
815	dist_range = 1
816	CALL disturb_field( nzb_u_inner, tend, u )
817	CALL disturb_field( nzb_v_inner, tend, v )
818	dist_range = 0
819	ENDIF
820	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
821	!$acc update device( u, v )
822	time_disturb = time_disturb - dt_disturb
823	ENDIF
824	ENDIF
825
826	!
827	!-- Reduce the velocity divergence via the equation for perturbation
828	!-- pressure.
829	IF ( intermediate_timestep_count == 1 .OR. &
830	call_psolver_at_all_substeps ) THEN
831	CALL pres
832	ENDIF
833
834	!
835	!-- If required, compute liquid water content
836	IF ( cloud_physics ) THEN
837	CALL calc_liquid_water_content
838	!$acc update device( ql )
839	ENDIF
840	!
841	!-- If required, compute virtual potential temperature
842	IF ( humidity ) THEN
843	CALL compute_vpt
844	!$acc update device( vpt )
845	ENDIF
846
847	!
848	!-- Compute the diffusion quantities
849	IF ( .NOT. constant_diffusion ) THEN
850
851	!
852	!-- Determine surface fluxes shf and qsws and surface values
853	!-- pt_surface and q_surface in dependence on data from external
854	!-- file LSF_DATA respectively
855	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
856	intermediate_timestep_count == intermediate_timestep_count_max )&
857	THEN
858	CALL ls_forcing_surf ( simulated_time )
859	ENDIF
860
861	!
862	!-- First the vertical fluxes in the surface (constant flux) layer are computed
863	IF ( constant_flux_layer ) THEN
864	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
865	CALL surface_layer_fluxes
866	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
867	ENDIF
868
869	!
870	!-- If required, solve the energy balance for the surface and run soil
871	!-- model
872	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
873
874	CALL cpu_log( log_point(54), 'land_surface', 'start' )
875	CALL lsm_energy_balance
876	CALL lsm_soil_model
877	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
878	ENDIF
879
880	!
881	!-- If required, solve the energy balance for urban surfaces and run
882	!-- the material heat model
883	IF (urban_surface) THEN
884	CALL cpu_log( log_point(74), 'urban_surface', 'start' )
885	CALL usm_surface_energy_balance
886	IF ( usm_material_model ) THEN
887	CALL usm_material_heat_model
888	ENDIF
889	CALL cpu_log( log_point(74), 'urban_surface', 'stop' )
890	ENDIF
891
892	!
893	!-- Compute the diffusion coefficients
894	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
895	IF ( .NOT. humidity ) THEN
896	IF ( ocean ) THEN
897	CALL diffusivities( prho, prho_reference )
898	ELSE
899	CALL diffusivities( pt, pt_reference )
900	ENDIF
901	ELSE
902	CALL diffusivities( vpt, pt_reference )
903	ENDIF
904	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
905
906	ENDIF
907
908	!
909	!-- If required, calculate radiative fluxes and heating rates
910	IF ( radiation .AND. intermediate_timestep_count &
911	== intermediate_timestep_count_max .AND. simulated_time > &
912	skip_time_do_radiation ) THEN
913
914	time_radiation = time_radiation + dt_3d
915
916	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
917	THEN
918
919	CALL cpu_log( log_point(50), 'radiation', 'start' )
920
921	IF ( .NOT. force_radiation_call ) THEN
922	time_radiation = time_radiation - dt_radiation
923	ENDIF
924
925	CALL radiation_control
926
927	CALL cpu_log( log_point(50), 'radiation', 'stop' )
928
929	IF (urban_surface) THEN
930	CALL cpu_log( log_point(75), 'usm_radiation', 'start' )
931	CALL usm_radiation
932	CALL cpu_log( log_point(75), 'usm_radiation', 'stop' )
933	ENDIF
934
935	ENDIF
936	ENDIF
937
938	ENDDO ! Intermediate step loop
939
940	!
941	!-- Increase simulation time and output times
942	nr_timesteps_this_run = nr_timesteps_this_run + 1
943	current_timestep_number = current_timestep_number + 1
944	simulated_time = simulated_time + dt_3d
945	simulated_time_chr = time_to_string( simulated_time )
946	time_since_reference_point = simulated_time - coupling_start_time
947
948
949
950	IF ( simulated_time >= skip_time_data_output_av ) THEN
951	time_do_av = time_do_av + dt_3d
952	ENDIF
953	IF ( simulated_time >= skip_time_do2d_xy ) THEN
954	time_do2d_xy = time_do2d_xy + dt_3d
955	ENDIF
956	IF ( simulated_time >= skip_time_do2d_xz ) THEN
957	time_do2d_xz = time_do2d_xz + dt_3d
958	ENDIF
959	IF ( simulated_time >= skip_time_do2d_yz ) THEN
960	time_do2d_yz = time_do2d_yz + dt_3d
961	ENDIF
962	IF ( simulated_time >= skip_time_do3d ) THEN
963	time_do3d = time_do3d + dt_3d
964	ENDIF
965	DO mid = 1, masks
966	IF ( simulated_time >= skip_time_domask(mid) ) THEN
967	time_domask(mid)= time_domask(mid) + dt_3d
968	ENDIF
969	ENDDO
970	time_dvrp = time_dvrp + dt_3d
971	IF ( simulated_time >= skip_time_dosp ) THEN
972	time_dosp = time_dosp + dt_3d
973	ENDIF
974	time_dots = time_dots + dt_3d
975	IF ( .NOT. first_call_lpm ) THEN
976	time_dopts = time_dopts + dt_3d
977	ENDIF
978	IF ( simulated_time >= skip_time_dopr ) THEN
979	time_dopr = time_dopr + dt_3d
980	ENDIF
981	time_dopr_listing = time_dopr_listing + dt_3d
982	time_run_control = time_run_control + dt_3d
983
984	!
985	!-- Data exchange between coupled models
986	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
987	time_coupling = time_coupling + dt_3d
988
989	!
990	!-- In case of model termination initiated by the local model
991	!-- (terminate_coupled > 0), the coupler must be skipped because it would
992	!-- cause an MPI intercomminucation hang.
993	!-- If necessary, the coupler will be called at the beginning of the
994	!-- next restart run.
995	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
996	CALL surface_coupler
997	time_coupling = time_coupling - dt_coupling
998	ENDDO
999	ENDIF
1000
1001	!
1002	!-- Execute user-defined actions
1003	CALL user_actions( 'after_integration' )
1004
1005	!
1006	!-- If Galilei transformation is used, determine the distance that the
1007	!-- model has moved so far
1008	IF ( galilei_transformation ) THEN
1009	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
1010	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
1011	ENDIF
1012
1013	!
1014	!-- Check, if restart is necessary (because cpu-time is expiring or
1015	!-- because it is forced by user) and set stop flag
1016	!-- This call is skipped if the remote model has already initiated a restart.
1017	IF ( .NOT. terminate_run ) CALL check_for_restart
1018
1019	!
1020	!-- Carry out statistical analysis and output at the requested output times.
1021	!-- The MOD function is used for calculating the output time counters (like
1022	!-- time_dopr) in order to regard a possible decrease of the output time
1023	!-- interval in case of restart runs
1024
1025	!
1026	!-- Set a flag indicating that so far no statistics have been created
1027	!-- for this time step
1028	flow_statistics_called = .FALSE.
1029
1030	!
1031	!-- If required, call flow_statistics for averaging in time
1032	IF ( averaging_interval_pr /= 0.0_wp .AND. &
1033	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
1034	simulated_time >= skip_time_dopr ) THEN
1035	time_dopr_av = time_dopr_av + dt_3d
1036	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
1037	do_sum = .TRUE.
1038	time_dopr_av = MOD( time_dopr_av, &
1039	MAX( dt_averaging_input_pr, dt_3d ) )
1040	ENDIF
1041	ENDIF
1042	IF ( do_sum ) CALL flow_statistics
1043
1044	!
1045	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1046	IF ( averaging_interval /= 0.0_wp .AND. &
1047	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
1048	simulated_time >= skip_time_data_output_av ) &
1049	THEN
1050	time_do_sla = time_do_sla + dt_3d
1051	IF ( time_do_sla >= dt_averaging_input ) THEN
1052	CALL sum_up_3d_data
1053	average_count_3d = average_count_3d + 1
1054	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1055	ENDIF
1056	ENDIF
1057
1058	!
1059	!-- Calculate spectra for time averaging
1060	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1061	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1062	simulated_time >= skip_time_dosp ) THEN
1063	time_dosp_av = time_dosp_av + dt_3d
1064	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1065	CALL calc_spectra
1066	time_dosp_av = MOD( time_dosp_av, &
1067	MAX( dt_averaging_input_pr, dt_3d ) )
1068	ENDIF
1069	ENDIF
1070
1071	!
1072	!-- Call flight module and output data
1073	IF ( virtual_flight ) THEN
1074	CALL flight_measurement
1075	CALL data_output_flight
1076	ENDIF
1077
1078	!
1079	!-- Profile output (ASCII) on file
1080	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1081	CALL print_1d
1082	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1083	dt_3d ) )
1084	ENDIF
1085
1086	!
1087	!-- Graphic output for PROFIL
1088	IF ( time_dopr >= dt_dopr ) THEN
1089	IF ( dopr_n /= 0 ) CALL data_output_profiles
1090	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1091	time_dopr_av = 0.0_wp ! due to averaging (see above)
1092	ENDIF
1093
1094	!
1095	!-- Graphic output for time series
1096	IF ( time_dots >= dt_dots ) THEN
1097	CALL data_output_tseries
1098	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1099	ENDIF
1100
1101	!
1102	!-- Output of spectra (formatted for use with PROFIL), in case of no
1103	!-- time averaging, spectra has to be calculated before
1104	IF ( time_dosp >= dt_dosp ) THEN
1105	IF ( average_count_sp == 0 ) CALL calc_spectra
1106	CALL data_output_spectra
1107	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1108	ENDIF
1109
1110	!
1111	!-- 2d-data output (cross-sections)
1112	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1113	CALL data_output_2d( 'xy', 0 )
1114	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1115	ENDIF
1116	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1117	CALL data_output_2d( 'xz', 0 )
1118	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1119	ENDIF
1120	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1121	CALL data_output_2d( 'yz', 0 )
1122	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1123	ENDIF
1124
1125	!
1126	!-- 3d-data output (volume data)
1127	IF ( time_do3d >= dt_do3d ) THEN
1128	CALL data_output_3d( 0 )
1129	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1130	ENDIF
1131
1132	!
1133	!-- Masked data output
1134	DO mid = 1, masks
1135	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1136	CALL data_output_mask( 0 )
1137	time_domask(mid) = MOD( time_domask(mid), &
1138	MAX( dt_domask(mid), dt_3d ) )
1139	ENDIF
1140	ENDDO
1141
1142	!
1143	!-- Output of time-averaged 2d/3d/masked data
1144	IF ( time_do_av >= dt_data_output_av ) THEN
1145	CALL average_3d_data
1146	CALL data_output_2d( 'xy', 1 )
1147	CALL data_output_2d( 'xz', 1 )
1148	CALL data_output_2d( 'yz', 1 )
1149	CALL data_output_3d( 1 )
1150	DO mid = 1, masks
1151	CALL data_output_mask( 1 )
1152	ENDDO
1153	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1154	ENDIF
1155
1156	!
1157	!-- Output of particle time series
1158	IF ( particle_advection ) THEN
1159	IF ( time_dopts >= dt_dopts .OR. &
1160	( simulated_time >= particle_advection_start .AND. &
1161	first_call_lpm ) ) THEN
1162	CALL data_output_ptseries
1163	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1164	ENDIF
1165	ENDIF
1166
1167	!
1168	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1169	#if defined( __dvrp_graphics )
1170	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1171	#endif
1172	IF ( time_dvrp >= dt_dvrp ) THEN
1173	CALL data_output_dvrp
1174	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1175	ENDIF
1176	#if defined( __dvrp_graphics )
1177	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1178	#endif
1179
1180	!
1181	!-- If required, set the heat flux for the next time step at a random value
1182	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1183
1184	!
1185	!-- Execute user-defined actions
1186	CALL user_actions( 'after_timestep' )
1187
1188	!
1189	!-- Determine size of next time step. Save timestep dt_3d because it is
1190	!-- newly calculated in routine timestep, but required further below for
1191	!-- steering the run control output interval
1192	dt_3d_old = dt_3d
1193	CALL timestep
1194
1195	!
1196	!-- Synchronize the timestep in case of nested run.
1197	IF ( nested_run ) THEN
1198	!
1199	!-- Synchronize by unifying the time step.
1200	!-- Global minimum of all time-steps is used for all.
1201	CALL pmci_synchronize
1202	ENDIF
1203
1204	!
1205	!-- Computation and output of run control parameters.
1206	!-- This is also done whenever perturbations have been imposed
1207	IF ( time_run_control >= dt_run_control .OR. &
1208	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1209	THEN
1210	! IF ( current_timestep_number == 1 ) THEN
1211	! IF ( nxl < 7 .AND. nxr > 7 .AND. nys < 7 .AND. nyn > 7 ) THEN
1212	! u(10,7,7) = 0.55
1213	! ENDIF
1214	! PRINT*, 'calculating minmax'
1215	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, u, &
1216	! 'abs', 0.0_wp, u_max, u_max_ijk )
1217	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, v, &
1218	! 'abs', 0.0_wp, v_max, v_max_ijk )
1219	! CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, w, &
1220	! 'abs', 0.0_wp, w_max, w_max_ijk )
1221	! PRINT*, 'calculated u_max = ', u_max, ' myid = ', myid
1222	! ENDIF
1223	CALL run_control
1224	IF ( time_run_control >= dt_run_control ) THEN
1225	time_run_control = MOD( time_run_control, &
1226	MAX( dt_run_control, dt_3d_old ) )
1227	ENDIF
1228	ENDIF
1229
1230	!
1231	!-- Output elapsed simulated time in form of a progress bar on stdout
1232	IF ( myid == 0 ) CALL output_progress_bar
1233
1234	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1235
1236
1237	ENDDO ! time loop
1238
1239	IF ( myid == 0 ) CALL finish_progress_bar
1240
1241	#if defined( __dvrp_graphics )
1242	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1243	#endif
1244
1245	CALL location_message( 'finished time-stepping', .TRUE. )
1246
1247	END SUBROUTINE time_integration

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