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source: palm/trunk/SOURCE/time_integration.f90 @ 1897

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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 1879 2016-04-20 08:39:42Z raasch $
26	!
27	! 1878 2016-04-19 12:30:36Z hellstea
28	! Synchronization for nested runs rewritten
29	!
30	! 1853 2016-04-11 09:00:35Z maronga
31	! Adjusted for use with radiation_scheme = constant
32	!
33	! 1849 2016-04-08 11:33:18Z hoffmann
34	! Adapted for modularization of microphysics
35	!
36	! 1833 2016-04-07 14:23:03Z raasch
37	! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
38	!
39	! 1831 2016-04-07 13:15:51Z hoffmann
40	! turbulence renamed collision_turbulence
41	!
42	! 1822 2016-04-07 07:49:42Z hoffmann
43	! icloud_scheme replaced by microphysics_*
44	!
45	! 1808 2016-04-05 19:44:00Z raasch
46	! output message in case unscheduled radiation calls removed
47	!
48	! 1797 2016-03-21 16:50:28Z raasch
49	! introduction of different datatransfer modes
50	!
51	! 1791 2016-03-11 10:41:25Z raasch
52	! call of pmci_update_new removed
53	!
54	! 1786 2016-03-08 05:49:27Z raasch
55	! +module spectrum
56	!
57	! 1783 2016-03-06 18:36:17Z raasch
58	! switch back of netcdf data format for mask output moved to the mask output
59	! routine
60	!
61	! 1781 2016-03-03 15:12:23Z raasch
62	! some pmc calls removed at the beginning (before timeloop),
63	! pmc initialization moved to the main program
64	!
65	! 1764 2016-02-28 12:45:19Z raasch
66	! PMC_ACTIVE flags removed,
67	! bugfix: nest synchronization after first call of timestep
68	!
69	! 1762 2016-02-25 12:31:13Z hellstea
70	! Introduction of nested domain feature
71	!
72	! 1736 2015-12-04 08:56:33Z raasch
73	! no perturbations added to total domain if energy limit has been set zero
74	!
75	! 1691 2015-10-26 16:17:44Z maronga
76	! Added option for spin-ups without land surface and radiation models. Moved calls
77	! for radiation and lan surface schemes.
78	!
79	! 1682 2015-10-07 23:56:08Z knoop
80	! Code annotations made doxygen readable
81	!
82	! 1671 2015-09-25 03:29:37Z raasch
83	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
84	! for particles
85	!
86	! 1585 2015-04-30 07:05:52Z maronga
87	! Moved call of radiation scheme. Added support for RRTM
88	!
89	! 1551 2015-03-03 14:18:16Z maronga
90	! Added interface for different radiation schemes.
91	!
92	! 1496 2014-12-02 17:25:50Z maronga
93	! Added calls for the land surface model and radiation scheme
94	!
95	! 1402 2014-05-09 14:25:13Z raasch
96	! location messages modified
97	!
98	! 1384 2014-05-02 14:31:06Z raasch
99	! location messages added
100	!
101	! 1380 2014-04-28 12:40:45Z heinze
102	! CALL of nudge_ref added
103	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
104	!
105	! 1365 2014-04-22 15:03:56Z boeske
106	! Reset sums_ls_l to zero at each timestep
107	! +sums_ls_l
108	! Calculation of reference state (previously in subroutine calc_mean_profile)
109
110	! 1342 2014-03-26 17:04:47Z kanani
111	! REAL constants defined as wp-kind
112	!
113	! 1320 2014-03-20 08:40:49Z raasch
114	! ONLY-attribute added to USE-statements,
115	! kind-parameters added to all INTEGER and REAL declaration statements,
116	! kinds are defined in new module kinds,
117	! old module precision_kind is removed,
118	! revision history before 2012 removed,
119	! comment fields (!:) to be used for variable explanations added to
120	! all variable declaration statements
121	! 1318 2014-03-17 13:35:16Z raasch
122	! module interfaces removed
123	!
124	! 1308 2014-03-13 14:58:42Z fricke
125	! +netcdf_data_format_save
126	! For masked data, parallel netcdf output is not tested so far, hence
127	! netcdf_data_format is switched back to non-paralell output.
128	!
129	! 1276 2014-01-15 13:40:41Z heinze
130	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
131	!
132	! 1257 2013-11-08 15:18:40Z raasch
133	! acc-update-host directive for timestep removed
134	!
135	! 1241 2013-10-30 11:36:58Z heinze
136	! Generalize calc_mean_profile for wider use
137	! Determine shf and qsws in dependence on data from LSF_DATA
138	! Determine ug and vg in dependence on data from LSF_DATA
139	! 1221 2013-09-10 08:59:13Z raasch
140	! host update of arrays before timestep is called
141	!
142	! 1179 2013-06-14 05:57:58Z raasch
143	! mean profiles for reference state are only calculated if required,
144	! small bugfix for background communication
145	!
146	! 1171 2013-05-30 11:27:45Z raasch
147	! split of prognostic_equations deactivated (comment lines), for the time being
148	!
149	! 1128 2013-04-12 06:19:32Z raasch
150	! asynchronous transfer of ghost point data realized for acc-optimized version:
151	! prognostic_equations are first called two times for those points required for
152	! the left-right and north-south exchange, respectively, and then for the
153	! remaining points,
154	! those parts requiring global communication moved from prognostic_equations to
155	! here
156	!
157	! 1115 2013-03-26 18:16:16Z hoffmann
158	! calculation of qr and nr is restricted to precipitation
159	!
160	! 1113 2013-03-10 02:48:14Z raasch
161	! GPU-porting of boundary conditions,
162	! openACC directives updated
163	! formal parameter removed from routine boundary_conds
164	!
165	! 1111 2013-03-08 23:54:10Z raasch
166	! +internal timestep counter for cpu statistics added,
167	! openACC directives updated
168	!
169	! 1092 2013-02-02 11:24:22Z raasch
170	! unused variables removed
171	!
172	! 1065 2012-11-22 17:42:36Z hoffmann
173	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
174	!
175	! 1053 2012-11-13 17:11:03Z hoffmann
176	! exchange of ghost points for nr, qr added
177	!
178	! 1036 2012-10-22 13:43:42Z raasch
179	! code put under GPL (PALM 3.9)
180	!
181	! 1019 2012-09-28 06:46:45Z raasch
182	! non-optimized version of prognostic_equations removed
183	!
184	! 1015 2012-09-27 09:23:24Z raasch
185	! +call of prognostic_equations_acc
186	!
187	! 1001 2012-09-13 14:08:46Z raasch
188	! all actions concerning leapfrog- and upstream-spline-scheme removed
189	!
190	! 849 2012-03-15 10:35:09Z raasch
191	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
192	!
193	! 825 2012-02-19 03:03:44Z raasch
194	! wang_collision_kernel renamed wang_kernel
195	!
196	! Revision 1.1 1997/08/11 06:19:04 raasch
197	! Initial revision
198	!
199	!
200	! Description:
201	! ------------
202	!> Integration in time of the model equations, statistical analysis and graphic
203	!> output
204	!------------------------------------------------------------------------------!
205	SUBROUTINE time_integration
206
207
208	USE advec_ws, &
209	ONLY: ws_statistics
210
211	USE arrays_3d, &
212	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
213	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, &
214	u, u_p, v, vpt, v_p, w, w_p
215
216	USE calc_mean_profile_mod, &
217	ONLY: calc_mean_profile
218
219	USE control_parameters, &
220	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
221	averaging_interval, averaging_interval_pr, &
222	bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
223	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
224	cloud_physics, constant_flux_layer, constant_heatflux, &
225	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
226	coupling_start_time, current_timestep_number, &
227	disturbance_created, disturbance_energy_limit, dist_range, &
228	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
229	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
230	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
231	dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, &
232	end_time, first_call_lpm, galilei_transformation, humidity, &
233	intermediate_timestep_count, &
234	intermediate_timestep_count_max, large_scale_forcing, &
235	loop_optimization, lsf_surf, lsf_vert, masks, &
236	microphysics_seifert, mid, nest_domain, &
237	neutral, nr_timesteps_this_run, nudging, &
238	ocean, on_device, passive_scalar, &
239	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
240	run_coupled, simulated_time, simulated_time_chr, &
241	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
242	skip_time_do3d, skip_time_domask, skip_time_dopr, &
243	skip_time_data_output_av, sloping_surface, &
244	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
245	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
246	time_do3d, time_domask, time_dopr, time_dopr_av, &
247	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
248	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
249	time_run_control, time_since_reference_point, &
250	turbulent_inflow, use_initial_profile_as_reference, &
251	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
252	ws_scheme_sca
253
254	USE cpulog, &
255	ONLY: cpu_log, log_point, log_point_s
256
257	USE indices, &
258	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
259	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
260
261	USE interaction_droplets_ptq_mod, &
262	ONLY: interaction_droplets_ptq
263
264	USE kinds
265
266	USE land_surface_model_mod, &
267	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
268	skip_time_do_lsm
269
270	USE ls_forcing_mod, &
271	ONLY: ls_forcing_surf, ls_forcing_vert
272
273	USE microphysics_mod, &
274	ONLY: collision_turbulence
275
276	USE nudge_mod, &
277	ONLY: calc_tnudge, nudge_ref
278
279	USE particle_attributes, &
280	ONLY: particle_advection, particle_advection_start, &
281	use_sgs_for_particles, wang_kernel
282
283	USE pegrid
284
285	USE pmc_interface, &
286	ONLY: client_to_server, nested_run, nesting_mode, &
287	pmci_datatrans, pmci_ensure_nest_mass_conservation, &
288	pmci_synchronize, server_to_client
289
290	USE production_e_mod, &
291	ONLY: production_e_init
292
293	USE progress_bar, &
294	ONLY: finish_progress_bar, output_progress_bar
295
296	USE prognostic_equations_mod, &
297	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
298	prognostic_equations_vector
299
300	USE radiation_model_mod, &
301	ONLY: dt_radiation, force_radiation_call, radiation, &
302	radiation_clearsky, radiation_constant, radiation_rrtmg, &
303	radiation_scheme, skip_time_do_radiation, time_radiation
304
305	USE spectra_mod, &
306	ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp, &
307	skip_time_dosp
308
309	USE statistics, &
310	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
311
312	USE surface_layer_fluxes_mod, &
313	ONLY: surface_layer_fluxes
314
315	USE user_actions_mod, &
316	ONLY: user_actions
317
318	IMPLICIT NONE
319
320	CHARACTER (LEN=9) :: time_to_string !<
321
322	!
323	!-- At the beginning of a simulation determine the time step as well as
324	!-- determine and print out the run control parameters
325	IF ( simulated_time == 0.0_wp ) CALL timestep
326
327	!
328	!-- Synchronize the timestep in case of nested run.
329	IF ( nested_run ) THEN
330	!
331	!-- Synchronization by unifying the time step.
332	!-- Global minimum of all time-steps is used for all.
333	CALL pmci_synchronize
334	ENDIF
335
336	CALL run_control
337
338	!
339	!-- Data exchange between coupled models in case that a call has been omitted
340	!-- at the end of the previous run of a job chain.
341	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
342	!
343	!-- In case of model termination initiated by the local model the coupler
344	!-- must not be called because this would again cause an MPI hang.
345	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
346	CALL surface_coupler
347	time_coupling = time_coupling - dt_coupling
348	ENDDO
349	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
350	THEN
351	time_coupling = time_since_reference_point
352	ENDIF
353	ENDIF
354
355	#if defined( __dvrp_graphics )
356	!
357	!-- Time measurement with dvrp software
358	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
359	#endif
360
361	CALL location_message( 'start with time-stepping', .TRUE. )
362	!
363	!-- Start of the time loop
364	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
365	.NOT. terminate_run )
366
367	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
368
369	!
370	!-- Determine size of next time step
371	IF ( simulated_time /= 0.0_wp ) THEN
372	CALL timestep
373	!
374	!-- Synchronize the timestep in case of nested run.
375	IF ( nested_run ) THEN
376	!
377	!-- Synchronize by unifying the time step.
378	!-- Global minimum of all time-steps is used for all.
379	CALL pmci_synchronize
380	ENDIF
381	ENDIF
382
383	!
384	!-- Determine ug, vg and w_subs in dependence on data from external file
385	!-- LSF_DATA
386	IF ( large_scale_forcing .AND. lsf_vert ) THEN
387	CALL ls_forcing_vert ( simulated_time )
388	sums_ls_l = 0.0_wp
389	ENDIF
390
391	!
392	!-- Set pt_init and q_init to the current profiles taken from
393	!-- NUDGING_DATA
394	IF ( nudging ) THEN
395	CALL nudge_ref ( simulated_time )
396	!
397	!-- Store temperature gradient at the top boundary for possible Neumann
398	!-- boundary condition
399	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
400	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
401	ENDIF
402
403	!
404	!-- Execute the user-defined actions
405	CALL user_actions( 'before_timestep' )
406
407	!
408	!-- Start of intermediate step loop
409	intermediate_timestep_count = 0
410	DO WHILE ( intermediate_timestep_count < &
411	intermediate_timestep_count_max )
412
413	intermediate_timestep_count = intermediate_timestep_count + 1
414
415	!
416	!-- Set the steering factors for the prognostic equations which depend
417	!-- on the timestep scheme
418	CALL timestep_scheme_steering
419
420	!
421	!-- Calculate those variables needed in the tendency terms which need
422	!-- global communication
423	IF ( .NOT. use_single_reference_value .AND. &
424	.NOT. use_initial_profile_as_reference ) THEN
425	!
426	!-- Horizontally averaged profiles to be used as reference state in
427	!-- buoyancy terms (WARNING: only the respective last call of
428	!-- calc_mean_profile defines the reference state!)
429	IF ( .NOT. neutral ) THEN
430	CALL calc_mean_profile( pt, 4 )
431	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
432	ENDIF
433	IF ( ocean ) THEN
434	CALL calc_mean_profile( rho, 64 )
435	ref_state(:) = hom(:,1,64,0)
436	ENDIF
437	IF ( humidity ) THEN
438	CALL calc_mean_profile( vpt, 44 )
439	ref_state(:) = hom(:,1,44,0)
440	ENDIF
441
442	ENDIF
443
444	IF ( .NOT. constant_diffusion ) CALL production_e_init
445	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
446	intermediate_timestep_count == 1 ) CALL ws_statistics
447	!
448	!-- In case of nudging calculate current nudging time scale and horizontal
449	!-- means of u, v, pt and q
450	IF ( nudging ) THEN
451	CALL calc_tnudge( simulated_time )
452	CALL calc_mean_profile( u, 1 )
453	CALL calc_mean_profile( v, 2 )
454	CALL calc_mean_profile( pt, 4 )
455	CALL calc_mean_profile( q, 41 )
456	ENDIF
457
458	!
459	!-- Solve the prognostic equations. A fast cache optimized version with
460	!-- only one single loop is used in case of Piascek-Williams advection
461	!-- scheme. NEC vector machines use a different version, because
462	!-- in the other versions a good vectorization is prohibited due to
463	!-- inlining problems.
464	IF ( loop_optimization == 'cache' ) THEN
465	CALL prognostic_equations_cache
466	ELSEIF ( loop_optimization == 'vector' ) THEN
467	CALL prognostic_equations_vector
468	ELSEIF ( loop_optimization == 'acc' ) THEN
469	i_left = nxl; i_right = nxr
470	j_south = nys; j_north = nyn
471	CALL prognostic_equations_acc
472
473	! i_left = nxl; i_right = nxl+nbgp-1
474	! j_south = nys; j_north = nyn
475	! CALL prognostic_equations_acc
476	! i_left = nxr-nbgp+1; i_right = nxr
477	! j_south = nys; j_north = nyn
478	! CALL prognostic_equations_acc
479
480	!
481	!-- Exchange of ghost points (lateral boundary conditions)
482	IF ( background_communication ) THEN
483
484	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
485
486	send_receive = 'lr'
487	sendrecv_in_background = .TRUE.
488	req = 0
489	req_count = 0
490
491	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
492	on_device = .TRUE. ! to be removed after complete porting
493	ELSE ! of ghost point exchange
494	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
495	ENDIF
496
497	CALL exchange_horiz( u_p, nbgp )
498	CALL exchange_horiz( v_p, nbgp )
499	CALL exchange_horiz( w_p, nbgp )
500	CALL exchange_horiz( pt_p, nbgp )
501	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
502	IF ( ocean ) THEN
503	CALL exchange_horiz( sa_p, nbgp )
504	CALL exchange_horiz( rho, nbgp )
505	CALL exchange_horiz( prho, nbgp )
506	ENDIF
507	IF (humidity .OR. passive_scalar) THEN
508	CALL exchange_horiz( q_p, nbgp )
509	IF ( cloud_physics .AND. microphysics_seifert ) THEN
510	CALL exchange_horiz( qr_p, nbgp )
511	CALL exchange_horiz( nr_p, nbgp )
512	ENDIF
513	ENDIF
514	IF ( cloud_droplets ) THEN
515	CALL exchange_horiz( ql, nbgp )
516	CALL exchange_horiz( ql_c, nbgp )
517	CALL exchange_horiz( ql_v, nbgp )
518	CALL exchange_horiz( ql_vp, nbgp )
519	ENDIF
520	IF ( wang_kernel .OR. collision_turbulence .OR. &
521	use_sgs_for_particles ) THEN
522	CALL exchange_horiz( diss, nbgp )
523	ENDIF
524
525	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
526	on_device = .FALSE. ! to be removed after complete porting
527	ELSE ! of ghost point exchange
528	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
529	ENDIF
530
531	sendrecv_in_background = .FALSE.
532
533	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
534
535	ENDIF
536
537	! i_left = nxl+nbgp; i_right = nxr-nbgp
538	! j_south = nys; j_north = nys+nbgp-1
539	! CALL prognostic_equations_acc
540	! i_left = nxl+nbgp; i_right = nxr-nbgp
541	! j_south = nyn-nbgp+1; j_north = nyn
542	! CALL prognostic_equations_acc
543
544	IF ( background_communication ) THEN
545	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
546	#if defined( __parallel )
547	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
548	#endif
549	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
550
551	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
552
553	send_receive = 'ns'
554	sendrecv_in_background = .TRUE.
555	req = 0
556	req_count = 0
557
558	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
559	on_device = .TRUE. ! to be removed after complete porting
560	ELSE ! of ghost point exchange
561	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
562	ENDIF
563
564	CALL exchange_horiz( u_p, nbgp )
565	CALL exchange_horiz( v_p, nbgp )
566	CALL exchange_horiz( w_p, nbgp )
567	CALL exchange_horiz( pt_p, nbgp )
568	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
569	IF ( ocean ) THEN
570	CALL exchange_horiz( sa_p, nbgp )
571	CALL exchange_horiz( rho, nbgp )
572	CALL exchange_horiz( prho, nbgp )
573	ENDIF
574	IF (humidity .OR. passive_scalar) THEN
575	CALL exchange_horiz( q_p, nbgp )
576	IF ( cloud_physics .AND. microphysics_seifert ) THEN
577	CALL exchange_horiz( qr_p, nbgp )
578	CALL exchange_horiz( nr_p, nbgp )
579	ENDIF
580	ENDIF
581	IF ( cloud_droplets ) THEN
582	CALL exchange_horiz( ql, nbgp )
583	CALL exchange_horiz( ql_c, nbgp )
584	CALL exchange_horiz( ql_v, nbgp )
585	CALL exchange_horiz( ql_vp, nbgp )
586	ENDIF
587	IF ( wang_kernel .OR. collision_turbulence .OR. &
588	use_sgs_for_particles ) THEN
589	CALL exchange_horiz( diss, nbgp )
590	ENDIF
591
592	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
593	on_device = .FALSE. ! to be removed after complete porting
594	ELSE ! of ghost point exchange
595	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
596	ENDIF
597
598	sendrecv_in_background = .FALSE.
599
600	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
601
602	ENDIF
603
604	! i_left = nxl+nbgp; i_right = nxr-nbgp
605	! j_south = nys+nbgp; j_north = nyn-nbgp
606	! CALL prognostic_equations_acc
607
608	IF ( background_communication ) THEN
609	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
610	#if defined( __parallel )
611	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
612	#endif
613	send_receive = 'al'
614	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
615	ENDIF
616
617	ENDIF
618
619	!
620	!-- Particle transport/physics with the Lagrangian particle model
621	!-- (only once during intermediate steps, because it uses an Euler-step)
622	!-- ### particle model should be moved before prognostic_equations, in order
623	!-- to regard droplet interactions directly
624	IF ( particle_advection .AND. &
625	simulated_time >= particle_advection_start .AND. &
626	intermediate_timestep_count == 1 ) THEN
627	CALL lpm
628	first_call_lpm = .FALSE.
629	ENDIF
630
631	!
632	!-- Interaction of droplets with temperature and specific humidity.
633	!-- Droplet condensation and evaporation is calculated within
634	!-- advec_particles.
635	IF ( cloud_droplets .AND. &
636	intermediate_timestep_count == intermediate_timestep_count_max )&
637	THEN
638	CALL interaction_droplets_ptq
639	ENDIF
640
641	!
642	!-- Exchange of ghost points (lateral boundary conditions)
643	IF ( .NOT. background_communication ) THEN
644
645	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
646
647	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
648	on_device = .TRUE. ! to be removed after complete porting
649	ELSE ! of ghost point exchange
650	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
651	ENDIF
652
653	CALL exchange_horiz( u_p, nbgp )
654	CALL exchange_horiz( v_p, nbgp )
655	CALL exchange_horiz( w_p, nbgp )
656	CALL exchange_horiz( pt_p, nbgp )
657	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
658	IF ( ocean ) THEN
659	CALL exchange_horiz( sa_p, nbgp )
660	CALL exchange_horiz( rho, nbgp )
661	CALL exchange_horiz( prho, nbgp )
662	ENDIF
663	IF (humidity .OR. passive_scalar) THEN
664	CALL exchange_horiz( q_p, nbgp )
665	IF ( cloud_physics .AND. microphysics_seifert ) THEN
666	CALL exchange_horiz( qr_p, nbgp )
667	CALL exchange_horiz( nr_p, nbgp )
668	ENDIF
669	ENDIF
670	IF ( cloud_droplets ) THEN
671	CALL exchange_horiz( ql, nbgp )
672	CALL exchange_horiz( ql_c, nbgp )
673	CALL exchange_horiz( ql_v, nbgp )
674	CALL exchange_horiz( ql_vp, nbgp )
675	ENDIF
676	IF ( wang_kernel .OR. collision_turbulence .OR. &
677	use_sgs_for_particles ) THEN
678	CALL exchange_horiz( diss, nbgp )
679	ENDIF
680
681	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
682	on_device = .FALSE. ! to be removed after complete porting
683	ELSE ! of ghost point exchange
684	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
685	ENDIF
686
687	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
688
689	ENDIF
690
691	!
692	!-- Boundary conditions for the prognostic quantities (except of the
693	!-- velocities at the outflow in case of a non-cyclic lateral wall)
694	CALL boundary_conds
695
696	!
697	!-- Swap the time levels in preparation for the next time step.
698	CALL swap_timelevel
699
700	IF ( nested_run ) THEN
701
702	CALL cpu_log( log_point(60), 'nesting', 'start' )
703	!
704	!-- Domain nesting. The data transfer subroutines pmci_server_datatrans
705	!-- and pmci_client_datatatrans are called inside the wrapper
706	!-- subroutine pmci_datatrans according to the control parameters
707	!-- nesting_mode and nesting_datatransfer_mode.
708	!-- TO_DO: why is nesting_mode given as a parameter here?
709	CALL pmci_datatrans( nesting_mode )
710
711	IF ( nesting_mode == 'two-way' ) THEN
712	!
713	!-- Exchange_horiz is needed for all server-domains after the
714	!-- anterpolation
715	CALL exchange_horiz( u, nbgp )
716	CALL exchange_horiz( v, nbgp )
717	CALL exchange_horiz( w, nbgp )
718	CALL exchange_horiz( pt, nbgp )
719	IF ( humidity .OR. passive_scalar ) THEN
720	CALL exchange_horiz( q, nbgp )
721	ENDIF
722	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
723	ENDIF
724	!
725	!-- Correct the w top-BC in nest domains to ensure mass conservation.
726	!-- This action must never be done for the root domain.
727	IF ( nest_domain ) THEN
728	CALL pmci_ensure_nest_mass_conservation
729	ENDIF
730
731	CALL cpu_log( log_point(60), 'nesting', 'stop' )
732
733	ENDIF
734
735	!
736	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
737	!-- when a sloping surface is used
738	IF ( sloping_surface ) THEN
739	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
740	pt_slope_offset
741	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
742	pt_slope_offset
743	ENDIF
744
745	!
746	!-- Impose a turbulent inflow using the recycling method
747	IF ( turbulent_inflow ) CALL inflow_turbulence
748
749	!
750	!-- Impose a random perturbation on the horizontal velocity field
751	IF ( create_disturbances .AND. &
752	( call_psolver_at_all_substeps .AND. &
753	intermediate_timestep_count == intermediate_timestep_count_max )&
754	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
755	intermediate_timestep_count == 1 ) ) &
756	THEN
757	time_disturb = time_disturb + dt_3d
758	IF ( time_disturb >= dt_disturb ) THEN
759	!$acc update host( u, v )
760	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
761	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
762	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
763	CALL disturb_field( nzb_u_inner, tend, u )
764	CALL disturb_field( nzb_v_inner, tend, v )
765	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
766	!
767	!-- Runs with a non-cyclic lateral wall need perturbations
768	!-- near the inflow throughout the whole simulation
769	dist_range = 1
770	CALL disturb_field( nzb_u_inner, tend, u )
771	CALL disturb_field( nzb_v_inner, tend, v )
772	dist_range = 0
773	ENDIF
774	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
775	!$acc update device( u, v )
776	time_disturb = time_disturb - dt_disturb
777	ENDIF
778	ENDIF
779
780	!
781	!-- Reduce the velocity divergence via the equation for perturbation
782	!-- pressure.
783	IF ( intermediate_timestep_count == 1 .OR. &
784	call_psolver_at_all_substeps ) THEN
785	CALL pres
786	ENDIF
787
788	!
789	!-- If required, compute liquid water content
790	IF ( cloud_physics ) THEN
791	CALL calc_liquid_water_content
792	!$acc update device( ql )
793	ENDIF
794	!
795	!-- If required, compute virtual potential temperature
796	IF ( humidity ) THEN
797	CALL compute_vpt
798	!$acc update device( vpt )
799	ENDIF
800
801	!
802	!-- Compute the diffusion quantities
803	IF ( .NOT. constant_diffusion ) THEN
804
805	!
806	!-- Determine surface fluxes shf and qsws and surface values
807	!-- pt_surface and q_surface in dependence on data from external
808	!-- file LSF_DATA respectively
809	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
810	intermediate_timestep_count == intermediate_timestep_count_max )&
811	THEN
812	CALL ls_forcing_surf ( simulated_time )
813	ENDIF
814
815	!
816	!-- First the vertical fluxes in the surface (constant flux) layer are computed
817	IF ( constant_flux_layer ) THEN
818	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
819	CALL surface_layer_fluxes
820	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
821	ENDIF
822
823	!
824	!-- If required, solve the energy balance for the surface and run soil
825	!-- model
826	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
827
828	CALL cpu_log( log_point(54), 'land_surface', 'start' )
829	CALL lsm_energy_balance
830	CALL lsm_soil_model
831	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
832	ENDIF
833	!
834	!-- Compute the diffusion coefficients
835	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
836	IF ( .NOT. humidity ) THEN
837	IF ( ocean ) THEN
838	CALL diffusivities( prho, prho_reference )
839	ELSE
840	CALL diffusivities( pt, pt_reference )
841	ENDIF
842	ELSE
843	CALL diffusivities( vpt, pt_reference )
844	ENDIF
845	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
846
847	ENDIF
848
849	!
850	!-- If required, calculate radiative fluxes and heating rates
851	IF ( radiation .AND. intermediate_timestep_count &
852	== intermediate_timestep_count_max .AND. simulated_time > &
853	skip_time_do_radiation ) THEN
854
855	time_radiation = time_radiation + dt_3d
856
857	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
858	THEN
859
860	CALL cpu_log( log_point(50), 'radiation', 'start' )
861
862	IF ( .NOT. force_radiation_call ) THEN
863	time_radiation = time_radiation - dt_radiation
864	ENDIF
865
866	IF ( radiation_scheme == 'clear-sky' ) THEN
867	CALL radiation_clearsky
868	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
869	CALL radiation_rrtmg
870	ELSE
871	CALL radiation_constant
872	ENDIF
873
874	CALL cpu_log( log_point(50), 'radiation', 'stop' )
875	ENDIF
876	ENDIF
877
878	ENDDO ! Intermediate step loop
879
880	!
881	!-- Increase simulation time and output times
882	nr_timesteps_this_run = nr_timesteps_this_run + 1
883	current_timestep_number = current_timestep_number + 1
884	simulated_time = simulated_time + dt_3d
885	simulated_time_chr = time_to_string( simulated_time )
886	time_since_reference_point = simulated_time - coupling_start_time
887
888	IF ( simulated_time >= skip_time_data_output_av ) THEN
889	time_do_av = time_do_av + dt_3d
890	ENDIF
891	IF ( simulated_time >= skip_time_do2d_xy ) THEN
892	time_do2d_xy = time_do2d_xy + dt_3d
893	ENDIF
894	IF ( simulated_time >= skip_time_do2d_xz ) THEN
895	time_do2d_xz = time_do2d_xz + dt_3d
896	ENDIF
897	IF ( simulated_time >= skip_time_do2d_yz ) THEN
898	time_do2d_yz = time_do2d_yz + dt_3d
899	ENDIF
900	IF ( simulated_time >= skip_time_do3d ) THEN
901	time_do3d = time_do3d + dt_3d
902	ENDIF
903	DO mid = 1, masks
904	IF ( simulated_time >= skip_time_domask(mid) ) THEN
905	time_domask(mid)= time_domask(mid) + dt_3d
906	ENDIF
907	ENDDO
908	time_dvrp = time_dvrp + dt_3d
909	IF ( simulated_time >= skip_time_dosp ) THEN
910	time_dosp = time_dosp + dt_3d
911	ENDIF
912	time_dots = time_dots + dt_3d
913	IF ( .NOT. first_call_lpm ) THEN
914	time_dopts = time_dopts + dt_3d
915	ENDIF
916	IF ( simulated_time >= skip_time_dopr ) THEN
917	time_dopr = time_dopr + dt_3d
918	ENDIF
919	time_dopr_listing = time_dopr_listing + dt_3d
920	time_run_control = time_run_control + dt_3d
921
922	!
923	!-- Data exchange between coupled models
924	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
925	time_coupling = time_coupling + dt_3d
926
927	!
928	!-- In case of model termination initiated by the local model
929	!-- (terminate_coupled > 0), the coupler must be skipped because it would
930	!-- cause an MPI intercomminucation hang.
931	!-- If necessary, the coupler will be called at the beginning of the
932	!-- next restart run.
933	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
934	CALL surface_coupler
935	time_coupling = time_coupling - dt_coupling
936	ENDDO
937	ENDIF
938
939	!
940	!-- Execute user-defined actions
941	CALL user_actions( 'after_integration' )
942
943	!
944	!-- If Galilei transformation is used, determine the distance that the
945	!-- model has moved so far
946	IF ( galilei_transformation ) THEN
947	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
948	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
949	ENDIF
950
951	!
952	!-- Check, if restart is necessary (because cpu-time is expiring or
953	!-- because it is forced by user) and set stop flag
954	!-- This call is skipped if the remote model has already initiated a restart.
955	IF ( .NOT. terminate_run ) CALL check_for_restart
956
957	!
958	!-- Carry out statistical analysis and output at the requested output times.
959	!-- The MOD function is used for calculating the output time counters (like
960	!-- time_dopr) in order to regard a possible decrease of the output time
961	!-- interval in case of restart runs
962
963	!
964	!-- Set a flag indicating that so far no statistics have been created
965	!-- for this time step
966	flow_statistics_called = .FALSE.
967
968	!
969	!-- If required, call flow_statistics for averaging in time
970	IF ( averaging_interval_pr /= 0.0_wp .AND. &
971	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
972	simulated_time >= skip_time_dopr ) THEN
973	time_dopr_av = time_dopr_av + dt_3d
974	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
975	do_sum = .TRUE.
976	time_dopr_av = MOD( time_dopr_av, &
977	MAX( dt_averaging_input_pr, dt_3d ) )
978	ENDIF
979	ENDIF
980	IF ( do_sum ) CALL flow_statistics
981
982	!
983	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
984	IF ( averaging_interval /= 0.0_wp .AND. &
985	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
986	simulated_time >= skip_time_data_output_av ) &
987	THEN
988	time_do_sla = time_do_sla + dt_3d
989	IF ( time_do_sla >= dt_averaging_input ) THEN
990	CALL sum_up_3d_data
991	average_count_3d = average_count_3d + 1
992	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
993	ENDIF
994	ENDIF
995
996	!
997	!-- Calculate spectra for time averaging
998	IF ( averaging_interval_sp /= 0.0_wp .AND. &
999	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1000	simulated_time >= skip_time_dosp ) THEN
1001	time_dosp_av = time_dosp_av + dt_3d
1002	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1003	CALL calc_spectra
1004	time_dosp_av = MOD( time_dosp_av, &
1005	MAX( dt_averaging_input_pr, dt_3d ) )
1006	ENDIF
1007	ENDIF
1008
1009	!
1010	!-- Computation and output of run control parameters.
1011	!-- This is also done whenever perturbations have been imposed
1012	IF ( time_run_control >= dt_run_control .OR. &
1013	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1014	THEN
1015	CALL run_control
1016	IF ( time_run_control >= dt_run_control ) THEN
1017	time_run_control = MOD( time_run_control, &
1018	MAX( dt_run_control, dt_3d ) )
1019	ENDIF
1020	ENDIF
1021
1022	!
1023	!-- Profile output (ASCII) on file
1024	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1025	CALL print_1d
1026	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1027	dt_3d ) )
1028	ENDIF
1029
1030	!
1031	!-- Graphic output for PROFIL
1032	IF ( time_dopr >= dt_dopr ) THEN
1033	IF ( dopr_n /= 0 ) CALL data_output_profiles
1034	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1035	time_dopr_av = 0.0_wp ! due to averaging (see above)
1036	ENDIF
1037
1038	!
1039	!-- Graphic output for time series
1040	IF ( time_dots >= dt_dots ) THEN
1041	CALL data_output_tseries
1042	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1043	ENDIF
1044
1045	!
1046	!-- Output of spectra (formatted for use with PROFIL), in case of no
1047	!-- time averaging, spectra has to be calculated before
1048	IF ( time_dosp >= dt_dosp ) THEN
1049	IF ( average_count_sp == 0 ) CALL calc_spectra
1050	CALL data_output_spectra
1051	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1052	ENDIF
1053
1054	!
1055	!-- 2d-data output (cross-sections)
1056	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1057	CALL data_output_2d( 'xy', 0 )
1058	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1059	ENDIF
1060	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1061	CALL data_output_2d( 'xz', 0 )
1062	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1063	ENDIF
1064	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1065	CALL data_output_2d( 'yz', 0 )
1066	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1067	ENDIF
1068
1069	!
1070	!-- 3d-data output (volume data)
1071	IF ( time_do3d >= dt_do3d ) THEN
1072	CALL data_output_3d( 0 )
1073	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1074	ENDIF
1075
1076	!
1077	!-- Masked data output
1078	DO mid = 1, masks
1079	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1080	CALL data_output_mask( 0 )
1081	time_domask(mid) = MOD( time_domask(mid), &
1082	MAX( dt_domask(mid), dt_3d ) )
1083	ENDIF
1084	ENDDO
1085
1086	!
1087	!-- Output of time-averaged 2d/3d/masked data
1088	IF ( time_do_av >= dt_data_output_av ) THEN
1089	CALL average_3d_data
1090	CALL data_output_2d( 'xy', 1 )
1091	CALL data_output_2d( 'xz', 1 )
1092	CALL data_output_2d( 'yz', 1 )
1093	CALL data_output_3d( 1 )
1094	DO mid = 1, masks
1095	CALL data_output_mask( 1 )
1096	ENDDO
1097	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1098	ENDIF
1099
1100	!
1101	!-- Output of particle time series
1102	IF ( particle_advection ) THEN
1103	IF ( time_dopts >= dt_dopts .OR. &
1104	( simulated_time >= particle_advection_start .AND. &
1105	first_call_lpm ) ) THEN
1106	CALL data_output_ptseries
1107	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1108	ENDIF
1109	ENDIF
1110
1111	!
1112	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1113	#if defined( __dvrp_graphics )
1114	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1115	#endif
1116	IF ( time_dvrp >= dt_dvrp ) THEN
1117	CALL data_output_dvrp
1118	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1119	ENDIF
1120	#if defined( __dvrp_graphics )
1121	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1122	#endif
1123
1124	!
1125	!-- If required, set the heat flux for the next time step at a random value
1126	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1127
1128	!
1129	!-- Execute user-defined actions
1130	CALL user_actions( 'after_timestep' )
1131
1132	!
1133	!-- Output elapsed simulated time in form of a progress bar on stdout
1134	IF ( myid == 0 ) CALL output_progress_bar
1135
1136	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1137
1138
1139	ENDDO ! time loop
1140
1141	IF ( myid == 0 ) CALL finish_progress_bar
1142
1143	#if defined( __dvrp_graphics )
1144	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1145	#endif
1146
1147	CALL location_message( 'finished time-stepping', .TRUE. )
1148
1149	END SUBROUTINE time_integration

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