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source: palm/trunk/SOURCE/time_integration.f90 @ 1876

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1	!> @file time_integration.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2016 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: time_integration.f90 1854 2016-04-11 09:03:15Z raasch $
26	!
27	! 1853 2016-04-11 09:00:35Z maronga
28	! Adjusted for use with radiation_scheme = constant
29	!
30	! 1849 2016-04-08 11:33:18Z hoffmann
31	! Adapted for modularization of microphysics
32	!
33	! 1833 2016-04-07 14:23:03Z raasch
34	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
35	!
36	! 1831 2016-04-07 13:15:51Z hoffmann
37	! turbulence renamed collision_turbulence
38	!
39	! 1822 2016-04-07 07:49:42Z hoffmann
40	! icloud_scheme replaced by microphysics_*
41	!
42	! 1808 2016-04-05 19:44:00Z raasch
43	! output message in case unscheduled radiation calls removed
44	!
45	! 1797 2016-03-21 16:50:28Z raasch
46	! introduction of different datatransfer modes
47	!
48	! 1791 2016-03-11 10:41:25Z raasch
49	! call of pmci_update_new removed
50	!
51	! 1786 2016-03-08 05:49:27Z raasch
52	! +module spectrum
53	!
54	! 1783 2016-03-06 18:36:17Z raasch
55	! switch back of netcdf data format for mask output moved to the mask output
56	! routine
57	!
58	! 1781 2016-03-03 15:12:23Z raasch
59	! some pmc calls removed at the beginning (before timeloop),
60	! pmc initialization moved to the main program
61	!
62	! 1764 2016-02-28 12:45:19Z raasch
63	! PMC_ACTIVE flags removed,
64	! bugfix: nest synchronization after first call of timestep
65	!
66	! 1762 2016-02-25 12:31:13Z hellstea
67	! Introduction of nested domain feature
68	!
69	! 1736 2015-12-04 08:56:33Z raasch
70	! no perturbations added to total domain if energy limit has been set zero
71	!
72	! 1691 2015-10-26 16:17:44Z maronga
73	! Added option for spin-ups without land surface and radiation models. Moved calls
74	! for radiation and lan surface schemes.
75	!
76	! 1682 2015-10-07 23:56:08Z knoop
77	! Code annotations made doxygen readable
78	!
79	! 1671 2015-09-25 03:29:37Z raasch
80	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
81	! for particles
82	!
83	! 1585 2015-04-30 07:05:52Z maronga
84	! Moved call of radiation scheme. Added support for RRTM
85	!
86	! 1551 2015-03-03 14:18:16Z maronga
87	! Added interface for different radiation schemes.
88	!
89	! 1496 2014-12-02 17:25:50Z maronga
90	! Added calls for the land surface model and radiation scheme
91	!
92	! 1402 2014-05-09 14:25:13Z raasch
93	! location messages modified
94	!
95	! 1384 2014-05-02 14:31:06Z raasch
96	! location messages added
97	!
98	! 1380 2014-04-28 12:40:45Z heinze
99	! CALL of nudge_ref added
100	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
101	!
102	! 1365 2014-04-22 15:03:56Z boeske
103	! Reset sums_ls_l to zero at each timestep
104	! +sums_ls_l
105	! Calculation of reference state (previously in subroutine calc_mean_profile)
106
107	! 1342 2014-03-26 17:04:47Z kanani
108	! REAL constants defined as wp-kind
109	!
110	! 1320 2014-03-20 08:40:49Z raasch
111	! ONLY-attribute added to USE-statements,
112	! kind-parameters added to all INTEGER and REAL declaration statements,
113	! kinds are defined in new module kinds,
114	! old module precision_kind is removed,
115	! revision history before 2012 removed,
116	! comment fields (!:) to be used for variable explanations added to
117	! all variable declaration statements
118	! 1318 2014-03-17 13:35:16Z raasch
119	! module interfaces removed
120	!
121	! 1308 2014-03-13 14:58:42Z fricke
122	! +netcdf_data_format_save
123	! For masked data, parallel netcdf output is not tested so far, hence
124	! netcdf_data_format is switched back to non-paralell output.
125	!
126	! 1276 2014-01-15 13:40:41Z heinze
127	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
128	!
129	! 1257 2013-11-08 15:18:40Z raasch
130	! acc-update-host directive for timestep removed
131	!
132	! 1241 2013-10-30 11:36:58Z heinze
133	! Generalize calc_mean_profile for wider use
134	! Determine shf and qsws in dependence on data from LSF_DATA
135	! Determine ug and vg in dependence on data from LSF_DATA
136	! 1221 2013-09-10 08:59:13Z raasch
137	! host update of arrays before timestep is called
138	!
139	! 1179 2013-06-14 05:57:58Z raasch
140	! mean profiles for reference state are only calculated if required,
141	! small bugfix for background communication
142	!
143	! 1171 2013-05-30 11:27:45Z raasch
144	! split of prognostic_equations deactivated (comment lines), for the time being
145	!
146	! 1128 2013-04-12 06:19:32Z raasch
147	! asynchronous transfer of ghost point data realized for acc-optimized version:
148	! prognostic_equations are first called two times for those points required for
149	! the left-right and north-south exchange, respectively, and then for the
150	! remaining points,
151	! those parts requiring global communication moved from prognostic_equations to
152	! here
153	!
154	! 1115 2013-03-26 18:16:16Z hoffmann
155	! calculation of qr and nr is restricted to precipitation
156	!
157	! 1113 2013-03-10 02:48:14Z raasch
158	! GPU-porting of boundary conditions,
159	! openACC directives updated
160	! formal parameter removed from routine boundary_conds
161	!
162	! 1111 2013-03-08 23:54:10Z raasch
163	! +internal timestep counter for cpu statistics added,
164	! openACC directives updated
165	!
166	! 1092 2013-02-02 11:24:22Z raasch
167	! unused variables removed
168	!
169	! 1065 2012-11-22 17:42:36Z hoffmann
170	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
171	!
172	! 1053 2012-11-13 17:11:03Z hoffmann
173	! exchange of ghost points for nr, qr added
174	!
175	! 1036 2012-10-22 13:43:42Z raasch
176	! code put under GPL (PALM 3.9)
177	!
178	! 1019 2012-09-28 06:46:45Z raasch
179	! non-optimized version of prognostic_equations removed
180	!
181	! 1015 2012-09-27 09:23:24Z raasch
182	! +call of prognostic_equations_acc
183	!
184	! 1001 2012-09-13 14:08:46Z raasch
185	! all actions concerning leapfrog- and upstream-spline-scheme removed
186	!
187	! 849 2012-03-15 10:35:09Z raasch
188	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
189	!
190	! 825 2012-02-19 03:03:44Z raasch
191	! wang_collision_kernel renamed wang_kernel
192	!
193	! Revision 1.1 1997/08/11 06:19:04 raasch
194	! Initial revision
195	!
196	!
197	! Description:
198	! ------------
199	!> Integration in time of the model equations, statistical analysis and graphic
200	!> output
201	!------------------------------------------------------------------------------!
202	SUBROUTINE time_integration
203
204
205	USE advec_ws, &
206	ONLY: ws_statistics
207
208	USE arrays_3d, &
209	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
210	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, &
211	u, u_p, v, vpt, v_p, w, w_p
212
213	USE calc_mean_profile_mod, &
214	ONLY: calc_mean_profile
215
216	USE control_parameters, &
217	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
218	averaging_interval, averaging_interval_pr, &
219	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
220	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
221	cloud_physics, constant_flux_layer, constant_heatflux, &
222	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
223	coupling_start_time, current_timestep_number, &
224	disturbance_created, disturbance_energy_limit, dist_range, &
225	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
226	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
227	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
228	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
229	end_time, first_call_lpm, galilei_transformation, humidity, &
230	intermediate_timestep_count, &
231	intermediate_timestep_count_max, large_scale_forcing, &
232	loop_optimization, lsf_surf, lsf_vert, masks, &
233	microphysics_seifert, mid, nest_domain, &
234	neutral, nr_timesteps_this_run, nudging, &
235	ocean, on_device, passive_scalar, &
236	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
237	run_coupled, simulated_time, simulated_time_chr, &
238	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
239	skip_time_do3d, skip_time_domask, skip_time_dopr, &
240	skip_time_data_output_av, sloping_surface, &
241	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
242	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
243	time_do3d, time_domask, time_dopr, time_dopr_av, &
244	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
245	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
246	time_run_control, time_since_reference_point, &
247	turbulent_inflow, use_initial_profile_as_reference, &
248	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
249	ws_scheme_sca
250
251	USE cpulog, &
252	ONLY: cpu_log, log_point, log_point_s
253
254	USE indices, &
255	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
256	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
257
258	USE interaction_droplets_ptq_mod, &
259	ONLY: interaction_droplets_ptq
260
261	USE kinds
262
263	USE land_surface_model_mod, &
264	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
265	skip_time_do_lsm
266
267	USE ls_forcing_mod, &
268	ONLY: ls_forcing_surf, ls_forcing_vert
269
270	USE microphysics_mod, &
271	ONLY: collision_turbulence
272
273	USE nudge_mod, &
274	ONLY: calc_tnudge, nudge_ref
275
276	USE particle_attributes, &
277	ONLY: particle_advection, particle_advection_start, &
278	use_sgs_for_particles, wang_kernel
279
280	USE pegrid
281
282	USE pmc_interface, &
283	ONLY: client_to_server, nested_run, nesting_mode, &
284	pmci_client_synchronize, pmci_datatrans, &
285	pmci_ensure_nest_mass_conservation, &
286	pmci_server_synchronize, server_to_client
287
288	USE production_e_mod, &
289	ONLY: production_e_init
290
291	USE progress_bar, &
292	ONLY: finish_progress_bar, output_progress_bar
293
294	USE prognostic_equations_mod, &
295	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
296	prognostic_equations_vector
297
298	USE radiation_model_mod, &
299	ONLY: dt_radiation, force_radiation_call, radiation, &
300	radiation_clearsky, radiation_constant, radiation_rrtmg, &
301	radiation_scheme, skip_time_do_radiation, time_radiation
302
303	USE spectra_mod, &
304	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
305	skip_time_dosp
306
307	USE statistics, &
308	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
309
310	USE surface_layer_fluxes_mod, &
311	ONLY: surface_layer_fluxes
312
313	USE user_actions_mod, &
314	ONLY: user_actions
315
316	IMPLICIT NONE
317
318	CHARACTER (LEN=9) :: time_to_string !<
319
320	!
321	!-- At the beginning of a simulation determine the time step as well as
322	!-- determine and print out the run control parameters
323	IF ( simulated_time == 0.0_wp ) CALL timestep
324
325	!
326	!-- Synchronize the timestep in case of nested run.
327	!-- The server side must be called first
328	IF ( nested_run ) THEN
329	CALL pmci_server_synchronize
330	CALL pmci_client_synchronize
331	ENDIF
332
333	CALL run_control
334
335	!
336	!-- Data exchange between coupled models in case that a call has been omitted
337	!-- at the end of the previous run of a job chain.
338	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
339	!
340	!-- In case of model termination initiated by the local model the coupler
341	!-- must not be called because this would again cause an MPI hang.
342	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
343	CALL surface_coupler
344	time_coupling = time_coupling - dt_coupling
345	ENDDO
346	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
347	THEN
348	time_coupling = time_since_reference_point
349	ENDIF
350	ENDIF
351
352	#if defined( __dvrp_graphics )
353	!
354	!-- Time measurement with dvrp software
355	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
356	#endif
357
358	CALL location_message( 'start with time-stepping', .TRUE. )
359	!
360	!-- Start of the time loop
361	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
362	.NOT. terminate_run )
363
364	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
365
366	!
367	!-- Determine size of next time step
368	IF ( simulated_time /= 0.0_wp ) THEN
369	CALL timestep
370
371	IF ( nested_run ) THEN
372	!
373	!-- TO_DO: try to give more detailed and meaningful comments here
374	!-- Server side must be called first
375	CALL pmci_server_synchronize
376	CALL pmci_client_synchronize
377	ENDIF
378	ENDIF
379
380
381	!
382	!-- Determine ug, vg and w_subs in dependence on data from external file
383	!-- LSF_DATA
384	IF ( large_scale_forcing .AND. lsf_vert ) THEN
385	CALL ls_forcing_vert ( simulated_time )
386	sums_ls_l = 0.0_wp
387	ENDIF
388
389	!
390	!-- Set pt_init and q_init to the current profiles taken from
391	!-- NUDGING_DATA
392	IF ( nudging ) THEN
393	CALL nudge_ref ( simulated_time )
394	!
395	!-- Store temperature gradient at the top boundary for possible Neumann
396	!-- boundary condition
397	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
398	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
399	ENDIF
400
401	!
402	!-- Execute the user-defined actions
403	CALL user_actions( 'before_timestep' )
404
405	!
406	!-- Start of intermediate step loop
407	intermediate_timestep_count = 0
408	DO WHILE ( intermediate_timestep_count < &
409	intermediate_timestep_count_max )
410
411	intermediate_timestep_count = intermediate_timestep_count + 1
412
413	!
414	!-- Set the steering factors for the prognostic equations which depend
415	!-- on the timestep scheme
416	CALL timestep_scheme_steering
417
418	!
419	!-- Calculate those variables needed in the tendency terms which need
420	!-- global communication
421	IF ( .NOT. use_single_reference_value .AND. &
422	.NOT. use_initial_profile_as_reference ) THEN
423	!
424	!-- Horizontally averaged profiles to be used as reference state in
425	!-- buoyancy terms (WARNING: only the respective last call of
426	!-- calc_mean_profile defines the reference state!)
427	IF ( .NOT. neutral ) THEN
428	CALL calc_mean_profile( pt, 4 )
429	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
430	ENDIF
431	IF ( ocean ) THEN
432	CALL calc_mean_profile( rho, 64 )
433	ref_state(:) = hom(:,1,64,0)
434	ENDIF
435	IF ( humidity ) THEN
436	CALL calc_mean_profile( vpt, 44 )
437	ref_state(:) = hom(:,1,44,0)
438	ENDIF
439
440	ENDIF
441
442	IF ( .NOT. constant_diffusion ) CALL production_e_init
443	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
444	intermediate_timestep_count == 1 ) CALL ws_statistics
445	!
446	!-- In case of nudging calculate current nudging time scale and horizontal
447	!-- means of u, v, pt and q
448	IF ( nudging ) THEN
449	CALL calc_tnudge( simulated_time )
450	CALL calc_mean_profile( u, 1 )
451	CALL calc_mean_profile( v, 2 )
452	CALL calc_mean_profile( pt, 4 )
453	CALL calc_mean_profile( q, 41 )
454	ENDIF
455
456	!
457	!-- Solve the prognostic equations. A fast cache optimized version with
458	!-- only one single loop is used in case of Piascek-Williams advection
459	!-- scheme. NEC vector machines use a different version, because
460	!-- in the other versions a good vectorization is prohibited due to
461	!-- inlining problems.
462	IF ( loop_optimization == 'cache' ) THEN
463	CALL prognostic_equations_cache
464	ELSEIF ( loop_optimization == 'vector' ) THEN
465	CALL prognostic_equations_vector
466	ELSEIF ( loop_optimization == 'acc' ) THEN
467	i_left = nxl; i_right = nxr
468	j_south = nys; j_north = nyn
469	CALL prognostic_equations_acc
470
471	! i_left = nxl; i_right = nxl+nbgp-1
472	! j_south = nys; j_north = nyn
473	! CALL prognostic_equations_acc
474	! i_left = nxr-nbgp+1; i_right = nxr
475	! j_south = nys; j_north = nyn
476	! CALL prognostic_equations_acc
477
478	!
479	!-- Exchange of ghost points (lateral boundary conditions)
480	IF ( background_communication ) THEN
481
482	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
483
484	send_receive = 'lr'
485	sendrecv_in_background = .TRUE.
486	req = 0
487	req_count = 0
488
489	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
490	on_device = .TRUE. ! to be removed after complete porting
491	ELSE ! of ghost point exchange
492	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
493	ENDIF
494
495	CALL exchange_horiz( u_p, nbgp )
496	CALL exchange_horiz( v_p, nbgp )
497	CALL exchange_horiz( w_p, nbgp )
498	CALL exchange_horiz( pt_p, nbgp )
499	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
500	IF ( ocean ) THEN
501	CALL exchange_horiz( sa_p, nbgp )
502	CALL exchange_horiz( rho, nbgp )
503	CALL exchange_horiz( prho, nbgp )
504	ENDIF
505	IF (humidity .OR. passive_scalar) THEN
506	CALL exchange_horiz( q_p, nbgp )
507	IF ( cloud_physics .AND. microphysics_seifert ) THEN
508	CALL exchange_horiz( qr_p, nbgp )
509	CALL exchange_horiz( nr_p, nbgp )
510	ENDIF
511	ENDIF
512	IF ( cloud_droplets ) THEN
513	CALL exchange_horiz( ql, nbgp )
514	CALL exchange_horiz( ql_c, nbgp )
515	CALL exchange_horiz( ql_v, nbgp )
516	CALL exchange_horiz( ql_vp, nbgp )
517	ENDIF
518	IF ( wang_kernel .OR. collision_turbulence .OR. &
519	use_sgs_for_particles ) THEN
520	CALL exchange_horiz( diss, nbgp )
521	ENDIF
522
523	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
524	on_device = .FALSE. ! to be removed after complete porting
525	ELSE ! of ghost point exchange
526	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
527	ENDIF
528
529	sendrecv_in_background = .FALSE.
530
531	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
532
533	ENDIF
534
535	! i_left = nxl+nbgp; i_right = nxr-nbgp
536	! j_south = nys; j_north = nys+nbgp-1
537	! CALL prognostic_equations_acc
538	! i_left = nxl+nbgp; i_right = nxr-nbgp
539	! j_south = nyn-nbgp+1; j_north = nyn
540	! CALL prognostic_equations_acc
541
542	IF ( background_communication ) THEN
543	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
544	#if defined( __parallel )
545	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
546	#endif
547	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
548
549	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
550
551	send_receive = 'ns'
552	sendrecv_in_background = .TRUE.
553	req = 0
554	req_count = 0
555
556	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
557	on_device = .TRUE. ! to be removed after complete porting
558	ELSE ! of ghost point exchange
559	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
560	ENDIF
561
562	CALL exchange_horiz( u_p, nbgp )
563	CALL exchange_horiz( v_p, nbgp )
564	CALL exchange_horiz( w_p, nbgp )
565	CALL exchange_horiz( pt_p, nbgp )
566	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
567	IF ( ocean ) THEN
568	CALL exchange_horiz( sa_p, nbgp )
569	CALL exchange_horiz( rho, nbgp )
570	CALL exchange_horiz( prho, nbgp )
571	ENDIF
572	IF (humidity .OR. passive_scalar) THEN
573	CALL exchange_horiz( q_p, nbgp )
574	IF ( cloud_physics .AND. microphysics_seifert ) THEN
575	CALL exchange_horiz( qr_p, nbgp )
576	CALL exchange_horiz( nr_p, nbgp )
577	ENDIF
578	ENDIF
579	IF ( cloud_droplets ) THEN
580	CALL exchange_horiz( ql, nbgp )
581	CALL exchange_horiz( ql_c, nbgp )
582	CALL exchange_horiz( ql_v, nbgp )
583	CALL exchange_horiz( ql_vp, nbgp )
584	ENDIF
585	IF ( wang_kernel .OR. collision_turbulence .OR. &
586	use_sgs_for_particles ) THEN
587	CALL exchange_horiz( diss, nbgp )
588	ENDIF
589
590	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
591	on_device = .FALSE. ! to be removed after complete porting
592	ELSE ! of ghost point exchange
593	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
594	ENDIF
595
596	sendrecv_in_background = .FALSE.
597
598	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
599
600	ENDIF
601
602	! i_left = nxl+nbgp; i_right = nxr-nbgp
603	! j_south = nys+nbgp; j_north = nyn-nbgp
604	! CALL prognostic_equations_acc
605
606	IF ( background_communication ) THEN
607	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
608	#if defined( __parallel )
609	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
610	#endif
611	send_receive = 'al'
612	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
613	ENDIF
614
615	ENDIF
616
617	!
618	!-- Particle transport/physics with the Lagrangian particle model
619	!-- (only once during intermediate steps, because it uses an Euler-step)
620	!-- ### particle model should be moved before prognostic_equations, in order
621	!-- to regard droplet interactions directly
622	IF ( particle_advection .AND. &
623	simulated_time >= particle_advection_start .AND. &
624	intermediate_timestep_count == 1 ) THEN
625	CALL lpm
626	first_call_lpm = .FALSE.
627	ENDIF
628
629	!
630	!-- Interaction of droplets with temperature and specific humidity.
631	!-- Droplet condensation and evaporation is calculated within
632	!-- advec_particles.
633	IF ( cloud_droplets .AND. &
634	intermediate_timestep_count == intermediate_timestep_count_max )&
635	THEN
636	CALL interaction_droplets_ptq
637	ENDIF
638
639	!
640	!-- Exchange of ghost points (lateral boundary conditions)
641	IF ( .NOT. background_communication ) THEN
642
643	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
644
645	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
646	on_device = .TRUE. ! to be removed after complete porting
647	ELSE ! of ghost point exchange
648	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
649	ENDIF
650
651	CALL exchange_horiz( u_p, nbgp )
652	CALL exchange_horiz( v_p, nbgp )
653	CALL exchange_horiz( w_p, nbgp )
654	CALL exchange_horiz( pt_p, nbgp )
655	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
656	IF ( ocean ) THEN
657	CALL exchange_horiz( sa_p, nbgp )
658	CALL exchange_horiz( rho, nbgp )
659	CALL exchange_horiz( prho, nbgp )
660	ENDIF
661	IF (humidity .OR. passive_scalar) THEN
662	CALL exchange_horiz( q_p, nbgp )
663	IF ( cloud_physics .AND. microphysics_seifert ) THEN
664	CALL exchange_horiz( qr_p, nbgp )
665	CALL exchange_horiz( nr_p, nbgp )
666	ENDIF
667	ENDIF
668	IF ( cloud_droplets ) THEN
669	CALL exchange_horiz( ql, nbgp )
670	CALL exchange_horiz( ql_c, nbgp )
671	CALL exchange_horiz( ql_v, nbgp )
672	CALL exchange_horiz( ql_vp, nbgp )
673	ENDIF
674	IF ( wang_kernel .OR. collision_turbulence .OR. &
675	use_sgs_for_particles ) THEN
676	CALL exchange_horiz( diss, nbgp )
677	ENDIF
678
679	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
680	on_device = .FALSE. ! to be removed after complete porting
681	ELSE ! of ghost point exchange
682	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
683	ENDIF
684
685	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
686
687	ENDIF
688
689	!
690	!-- Boundary conditions for the prognostic quantities (except of the
691	!-- velocities at the outflow in case of a non-cyclic lateral wall)
692	CALL boundary_conds
693
694	!
695	!-- Swap the time levels in preparation for the next time step.
696	CALL swap_timelevel
697
698	IF ( nested_run ) THEN
699
700	CALL cpu_log( log_point(60), 'nesting', 'start' )
701	!
702	!-- Domain nesting. The data transfer subroutines pmci_server_datatrans
703	!-- and pmci_client_datatatrans are called inside the wrapper
704	!-- subroutine pmci_datatrans according to the control parameters
705	!-- nesting_mode and nesting_datatransfer_mode.
706	!-- TO_DO: why is nesting_mode given as a parameter here?
707	CALL pmci_datatrans( nesting_mode )
708
709	IF ( nesting_mode == 'two-way' ) THEN
710	!
711	!-- Exchange_horiz is needed for all server-domains after the
712	!-- anterpolation
713	CALL exchange_horiz( u, nbgp )
714	CALL exchange_horiz( v, nbgp )
715	CALL exchange_horiz( w, nbgp )
716	CALL exchange_horiz( pt, nbgp )
717	IF ( humidity .OR. passive_scalar ) THEN
718	CALL exchange_horiz( q, nbgp )
719	ENDIF
720	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
721	ENDIF
722	!
723	!-- Correct the w top-BC in nest domains to ensure mass conservation.
724	!-- This action must never be done for the root domain.
725	IF ( nest_domain ) THEN
726	CALL pmci_ensure_nest_mass_conservation
727	ENDIF
728
729	CALL cpu_log( log_point(60), 'nesting', 'stop' )
730
731	ENDIF
732
733	!
734	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
735	!-- when a sloping surface is used
736	IF ( sloping_surface ) THEN
737	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
738	pt_slope_offset
739	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
740	pt_slope_offset
741	ENDIF
742
743	!
744	!-- Impose a turbulent inflow using the recycling method
745	IF ( turbulent_inflow ) CALL inflow_turbulence
746
747	!
748	!-- Impose a random perturbation on the horizontal velocity field
749	IF ( create_disturbances .AND. &
750	( call_psolver_at_all_substeps .AND. &
751	intermediate_timestep_count == intermediate_timestep_count_max )&
752	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
753	intermediate_timestep_count == 1 ) ) &
754	THEN
755	time_disturb = time_disturb + dt_3d
756	IF ( time_disturb >= dt_disturb ) THEN
757	!$acc update host( u, v )
758	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
759	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
760	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
761	CALL disturb_field( nzb_u_inner, tend, u )
762	CALL disturb_field( nzb_v_inner, tend, v )
763	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
764	!
765	!-- Runs with a non-cyclic lateral wall need perturbations
766	!-- near the inflow throughout the whole simulation
767	dist_range = 1
768	CALL disturb_field( nzb_u_inner, tend, u )
769	CALL disturb_field( nzb_v_inner, tend, v )
770	dist_range = 0
771	ENDIF
772	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
773	!$acc update device( u, v )
774	time_disturb = time_disturb - dt_disturb
775	ENDIF
776	ENDIF
777
778	!
779	!-- Reduce the velocity divergence via the equation for perturbation
780	!-- pressure.
781	IF ( intermediate_timestep_count == 1 .OR. &
782	call_psolver_at_all_substeps ) THEN
783	CALL pres
784	ENDIF
785
786	!
787	!-- If required, compute liquid water content
788	IF ( cloud_physics ) THEN
789	CALL calc_liquid_water_content
790	!$acc update device( ql )
791	ENDIF
792	!
793	!-- If required, compute virtual potential temperature
794	IF ( humidity ) THEN
795	CALL compute_vpt
796	!$acc update device( vpt )
797	ENDIF
798
799	!
800	!-- Compute the diffusion quantities
801	IF ( .NOT. constant_diffusion ) THEN
802
803	!
804	!-- Determine surface fluxes shf and qsws and surface values
805	!-- pt_surface and q_surface in dependence on data from external
806	!-- file LSF_DATA respectively
807	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
808	intermediate_timestep_count == intermediate_timestep_count_max )&
809	THEN
810	CALL ls_forcing_surf ( simulated_time )
811	ENDIF
812
813	!
814	!-- First the vertical fluxes in the surface (constant flux) layer are computed
815	IF ( constant_flux_layer ) THEN
816	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
817	CALL surface_layer_fluxes
818	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
819	ENDIF
820
821	!
822	!-- If required, solve the energy balance for the surface and run soil
823	!-- model
824	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
825
826	CALL cpu_log( log_point(54), 'land_surface', 'start' )
827	CALL lsm_energy_balance
828	CALL lsm_soil_model
829	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
830	ENDIF
831	!
832	!-- Compute the diffusion coefficients
833	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
834	IF ( .NOT. humidity ) THEN
835	IF ( ocean ) THEN
836	CALL diffusivities( prho, prho_reference )
837	ELSE
838	CALL diffusivities( pt, pt_reference )
839	ENDIF
840	ELSE
841	CALL diffusivities( vpt, pt_reference )
842	ENDIF
843	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
844
845	ENDIF
846
847	!
848	!-- If required, calculate radiative fluxes and heating rates
849	IF ( radiation .AND. intermediate_timestep_count &
850	== intermediate_timestep_count_max .AND. simulated_time > &
851	skip_time_do_radiation ) THEN
852
853	time_radiation = time_radiation + dt_3d
854
855	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
856	THEN
857
858	CALL cpu_log( log_point(50), 'radiation', 'start' )
859
860	IF ( .NOT. force_radiation_call ) THEN
861	time_radiation = time_radiation - dt_radiation
862	ENDIF
863
864	IF ( radiation_scheme == 'clear-sky' ) THEN
865	CALL radiation_clearsky
866	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
867	CALL radiation_rrtmg
868	ELSE
869	CALL radiation_constant
870	ENDIF
871
872	CALL cpu_log( log_point(50), 'radiation', 'stop' )
873	ENDIF
874	ENDIF
875
876	ENDDO ! Intermediate step loop
877
878	!
879	!-- Increase simulation time and output times
880	nr_timesteps_this_run = nr_timesteps_this_run + 1
881	current_timestep_number = current_timestep_number + 1
882	simulated_time = simulated_time + dt_3d
883	simulated_time_chr = time_to_string( simulated_time )
884	time_since_reference_point = simulated_time - coupling_start_time
885
886	IF ( simulated_time >= skip_time_data_output_av ) THEN
887	time_do_av = time_do_av + dt_3d
888	ENDIF
889	IF ( simulated_time >= skip_time_do2d_xy ) THEN
890	time_do2d_xy = time_do2d_xy + dt_3d
891	ENDIF
892	IF ( simulated_time >= skip_time_do2d_xz ) THEN
893	time_do2d_xz = time_do2d_xz + dt_3d
894	ENDIF
895	IF ( simulated_time >= skip_time_do2d_yz ) THEN
896	time_do2d_yz = time_do2d_yz + dt_3d
897	ENDIF
898	IF ( simulated_time >= skip_time_do3d ) THEN
899	time_do3d = time_do3d + dt_3d
900	ENDIF
901	DO mid = 1, masks
902	IF ( simulated_time >= skip_time_domask(mid) ) THEN
903	time_domask(mid)= time_domask(mid) + dt_3d
904	ENDIF
905	ENDDO
906	time_dvrp = time_dvrp + dt_3d
907	IF ( simulated_time >= skip_time_dosp ) THEN
908	time_dosp = time_dosp + dt_3d
909	ENDIF
910	time_dots = time_dots + dt_3d
911	IF ( .NOT. first_call_lpm ) THEN
912	time_dopts = time_dopts + dt_3d
913	ENDIF
914	IF ( simulated_time >= skip_time_dopr ) THEN
915	time_dopr = time_dopr + dt_3d
916	ENDIF
917	time_dopr_listing = time_dopr_listing + dt_3d
918	time_run_control = time_run_control + dt_3d
919
920	!
921	!-- Data exchange between coupled models
922	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
923	time_coupling = time_coupling + dt_3d
924
925	!
926	!-- In case of model termination initiated by the local model
927	!-- (terminate_coupled > 0), the coupler must be skipped because it would
928	!-- cause an MPI intercomminucation hang.
929	!-- If necessary, the coupler will be called at the beginning of the
930	!-- next restart run.
931	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
932	CALL surface_coupler
933	time_coupling = time_coupling - dt_coupling
934	ENDDO
935	ENDIF
936
937	!
938	!-- Execute user-defined actions
939	CALL user_actions( 'after_integration' )
940
941	!
942	!-- If Galilei transformation is used, determine the distance that the
943	!-- model has moved so far
944	IF ( galilei_transformation ) THEN
945	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
946	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
947	ENDIF
948
949	!
950	!-- Check, if restart is necessary (because cpu-time is expiring or
951	!-- because it is forced by user) and set stop flag
952	!-- This call is skipped if the remote model has already initiated a restart.
953	IF ( .NOT. terminate_run ) CALL check_for_restart
954
955	!
956	!-- Carry out statistical analysis and output at the requested output times.
957	!-- The MOD function is used for calculating the output time counters (like
958	!-- time_dopr) in order to regard a possible decrease of the output time
959	!-- interval in case of restart runs
960
961	!
962	!-- Set a flag indicating that so far no statistics have been created
963	!-- for this time step
964	flow_statistics_called = .FALSE.
965
966	!
967	!-- If required, call flow_statistics for averaging in time
968	IF ( averaging_interval_pr /= 0.0_wp .AND. &
969	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
970	simulated_time >= skip_time_dopr ) THEN
971	time_dopr_av = time_dopr_av + dt_3d
972	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
973	do_sum = .TRUE.
974	time_dopr_av = MOD( time_dopr_av, &
975	MAX( dt_averaging_input_pr, dt_3d ) )
976	ENDIF
977	ENDIF
978	IF ( do_sum ) CALL flow_statistics
979
980	!
981	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
982	IF ( averaging_interval /= 0.0_wp .AND. &
983	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
984	simulated_time >= skip_time_data_output_av ) &
985	THEN
986	time_do_sla = time_do_sla + dt_3d
987	IF ( time_do_sla >= dt_averaging_input ) THEN
988	CALL sum_up_3d_data
989	average_count_3d = average_count_3d + 1
990	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
991	ENDIF
992	ENDIF
993
994	!
995	!-- Calculate spectra for time averaging
996	IF ( averaging_interval_sp /= 0.0_wp .AND. &
997	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
998	simulated_time >= skip_time_dosp ) THEN
999	time_dosp_av = time_dosp_av + dt_3d
1000	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1001	CALL calc_spectra
1002	time_dosp_av = MOD( time_dosp_av, &
1003	MAX( dt_averaging_input_pr, dt_3d ) )
1004	ENDIF
1005	ENDIF
1006
1007	!
1008	!-- Computation and output of run control parameters.
1009	!-- This is also done whenever perturbations have been imposed
1010	IF ( time_run_control >= dt_run_control .OR. &
1011	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1012	THEN
1013	CALL run_control
1014	IF ( time_run_control >= dt_run_control ) THEN
1015	time_run_control = MOD( time_run_control, &
1016	MAX( dt_run_control, dt_3d ) )
1017	ENDIF
1018	ENDIF
1019
1020	!
1021	!-- Profile output (ASCII) on file
1022	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1023	CALL print_1d
1024	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1025	dt_3d ) )
1026	ENDIF
1027
1028	!
1029	!-- Graphic output for PROFIL
1030	IF ( time_dopr >= dt_dopr ) THEN
1031	IF ( dopr_n /= 0 ) CALL data_output_profiles
1032	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1033	time_dopr_av = 0.0_wp ! due to averaging (see above)
1034	ENDIF
1035
1036	!
1037	!-- Graphic output for time series
1038	IF ( time_dots >= dt_dots ) THEN
1039	CALL data_output_tseries
1040	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1041	ENDIF
1042
1043	!
1044	!-- Output of spectra (formatted for use with PROFIL), in case of no
1045	!-- time averaging, spectra has to be calculated before
1046	IF ( time_dosp >= dt_dosp ) THEN
1047	IF ( average_count_sp == 0 ) CALL calc_spectra
1048	CALL data_output_spectra
1049	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1050	ENDIF
1051
1052	!
1053	!-- 2d-data output (cross-sections)
1054	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1055	CALL data_output_2d( 'xy', 0 )
1056	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1057	ENDIF
1058	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1059	CALL data_output_2d( 'xz', 0 )
1060	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1061	ENDIF
1062	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1063	CALL data_output_2d( 'yz', 0 )
1064	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1065	ENDIF
1066
1067	!
1068	!-- 3d-data output (volume data)
1069	IF ( time_do3d >= dt_do3d ) THEN
1070	CALL data_output_3d( 0 )
1071	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1072	ENDIF
1073
1074	!
1075	!-- Masked data output
1076	DO mid = 1, masks
1077	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1078	CALL data_output_mask( 0 )
1079	time_domask(mid) = MOD( time_domask(mid), &
1080	MAX( dt_domask(mid), dt_3d ) )
1081	ENDIF
1082	ENDDO
1083
1084	!
1085	!-- Output of time-averaged 2d/3d/masked data
1086	IF ( time_do_av >= dt_data_output_av ) THEN
1087	CALL average_3d_data
1088	CALL data_output_2d( 'xy', 1 )
1089	CALL data_output_2d( 'xz', 1 )
1090	CALL data_output_2d( 'yz', 1 )
1091	CALL data_output_3d( 1 )
1092	DO mid = 1, masks
1093	CALL data_output_mask( 1 )
1094	ENDDO
1095	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1096	ENDIF
1097
1098	!
1099	!-- Output of particle time series
1100	IF ( particle_advection ) THEN
1101	IF ( time_dopts >= dt_dopts .OR. &
1102	( simulated_time >= particle_advection_start .AND. &
1103	first_call_lpm ) ) THEN
1104	CALL data_output_ptseries
1105	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1106	ENDIF
1107	ENDIF
1108
1109	!
1110	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1111	#if defined( __dvrp_graphics )
1112	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1113	#endif
1114	IF ( time_dvrp >= dt_dvrp ) THEN
1115	CALL data_output_dvrp
1116	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1117	ENDIF
1118	#if defined( __dvrp_graphics )
1119	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1120	#endif
1121
1122	!
1123	!-- If required, set the heat flux for the next time step at a random value
1124	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1125
1126	!
1127	!-- Execute user-defined actions
1128	CALL user_actions( 'after_timestep' )
1129
1130	!
1131	!-- Output elapsed simulated time in form of a progress bar on stdout
1132	IF ( myid == 0 ) CALL output_progress_bar
1133
1134	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1135
1136
1137	ENDDO ! time loop
1138
1139	IF ( myid == 0 ) CALL finish_progress_bar
1140
1141	#if defined( __dvrp_graphics )
1142	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1143	#endif
1144
1145	CALL location_message( 'finished time-stepping', .TRUE. )
1146
1147	END SUBROUTINE time_integration

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