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source: palm/trunk/SOURCE/time_integration.f90 @ 1764

Last change on this file since 1764 was 1764, checked in by raasch, 9 years ago
update of the nested domain system + some bugfixes
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File size: 45.6 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 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 1997-2015 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	! PMC_ACTIVE flags removed,
22	! nest synchronization after first call of timestep
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: time_integration.f90 1764 2016-02-28 12:45:19Z raasch $
27	!
28	! 1762 2016-02-25 12:31:13Z hellstea
29	! Introduction of nested domain feature
30	!
31	! 1736 2015-12-04 08:56:33Z raasch
32	! no perturbations added to total domain if energy limit has been set zero
33	!
34	! 1691 2015-10-26 16:17:44Z maronga
35	! Added option for spin-ups without land surface and radiation models. Moved calls
36	! for radiation and lan surface schemes.
37	!
38	! 1682 2015-10-07 23:56:08Z knoop
39	! Code annotations made doxygen readable
40	!
41	! 1671 2015-09-25 03:29:37Z raasch
42	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
43	! for particles
44	!
45	! 1585 2015-04-30 07:05:52Z maronga
46	! Moved call of radiation scheme. Added support for RRTM
47	!
48	! 1551 2015-03-03 14:18:16Z maronga
49	! Added interface for different radiation schemes.
50	!
51	! 1496 2014-12-02 17:25:50Z maronga
52	! Added calls for the land surface model and radiation scheme
53	!
54	! 1402 2014-05-09 14:25:13Z raasch
55	! location messages modified
56	!
57	! 1384 2014-05-02 14:31:06Z raasch
58	! location messages added
59	!
60	! 1380 2014-04-28 12:40:45Z heinze
61	! CALL of nudge_ref added
62	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
63	!
64	! 1365 2014-04-22 15:03:56Z boeske
65	! Reset sums_ls_l to zero at each timestep
66	! +sums_ls_l
67	! Calculation of reference state (previously in subroutine calc_mean_profile)
68
69	! 1342 2014-03-26 17:04:47Z kanani
70	! REAL constants defined as wp-kind
71	!
72	! 1320 2014-03-20 08:40:49Z raasch
73	! ONLY-attribute added to USE-statements,
74	! kind-parameters added to all INTEGER and REAL declaration statements,
75	! kinds are defined in new module kinds,
76	! old module precision_kind is removed,
77	! revision history before 2012 removed,
78	! comment fields (!:) to be used for variable explanations added to
79	! all variable declaration statements
80	! 1318 2014-03-17 13:35:16Z raasch
81	! module interfaces removed
82	!
83	! 1308 2014-03-13 14:58:42Z fricke
84	! +netcdf_data_format_save
85	! For masked data, parallel netcdf output is not tested so far, hence
86	! netcdf_data_format is switched back to non-paralell output.
87	!
88	! 1276 2014-01-15 13:40:41Z heinze
89	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
90	!
91	! 1257 2013-11-08 15:18:40Z raasch
92	! acc-update-host directive for timestep removed
93	!
94	! 1241 2013-10-30 11:36:58Z heinze
95	! Generalize calc_mean_profile for wider use
96	! Determine shf and qsws in dependence on data from LSF_DATA
97	! Determine ug and vg in dependence on data from LSF_DATA
98	! 1221 2013-09-10 08:59:13Z raasch
99	! host update of arrays before timestep is called
100	!
101	! 1179 2013-06-14 05:57:58Z raasch
102	! mean profiles for reference state are only calculated if required,
103	! small bugfix for background communication
104	!
105	! 1171 2013-05-30 11:27:45Z raasch
106	! split of prognostic_equations deactivated (comment lines), for the time being
107	!
108	! 1128 2013-04-12 06:19:32Z raasch
109	! asynchronous transfer of ghost point data realized for acc-optimized version:
110	! prognostic_equations are first called two times for those points required for
111	! the left-right and north-south exchange, respectively, and then for the
112	! remaining points,
113	! those parts requiring global communication moved from prognostic_equations to
114	! here
115	!
116	! 1115 2013-03-26 18:16:16Z hoffmann
117	! calculation of qr and nr is restricted to precipitation
118	!
119	! 1113 2013-03-10 02:48:14Z raasch
120	! GPU-porting of boundary conditions,
121	! openACC directives updated
122	! formal parameter removed from routine boundary_conds
123	!
124	! 1111 2013-03-08 23:54:10Z raasch
125	! +internal timestep counter for cpu statistics added,
126	! openACC directives updated
127	!
128	! 1092 2013-02-02 11:24:22Z raasch
129	! unused variables removed
130	!
131	! 1065 2012-11-22 17:42:36Z hoffmann
132	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
133	!
134	! 1053 2012-11-13 17:11:03Z hoffmann
135	! exchange of ghost points for nr, qr added
136	!
137	! 1036 2012-10-22 13:43:42Z raasch
138	! code put under GPL (PALM 3.9)
139	!
140	! 1019 2012-09-28 06:46:45Z raasch
141	! non-optimized version of prognostic_equations removed
142	!
143	! 1015 2012-09-27 09:23:24Z raasch
144	! +call of prognostic_equations_acc
145	!
146	! 1001 2012-09-13 14:08:46Z raasch
147	! all actions concerning leapfrog- and upstream-spline-scheme removed
148	!
149	! 849 2012-03-15 10:35:09Z raasch
150	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
151	!
152	! 825 2012-02-19 03:03:44Z raasch
153	! wang_collision_kernel renamed wang_kernel
154	!
155	! Revision 1.1 1997/08/11 06:19:04 raasch
156	! Initial revision
157	!
158	!
159	! Description:
160	! ------------
161	!> Integration in time of the model equations, statistical analysis and graphic
162	!> output
163	!------------------------------------------------------------------------------!
164	SUBROUTINE time_integration
165
166
167	USE advec_ws, &
168	ONLY: ws_statistics
169
170	USE arrays_3d, &
171	ONLY: diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, &
172	ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, &
173	u, u_p, v, vpt, v_p, w, w_p
174
175	USE calc_mean_profile_mod, &
176	ONLY: calc_mean_profile
177
178	USE control_parameters, &
179	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
180	average_count_sp, averaging_interval, averaging_interval_pr, &
181	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
182	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
183	cloud_physics, constant_flux_layer, constant_heatflux, &
184	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
185	coupling_start_time, current_timestep_number, &
186	disturbance_created, disturbance_energy_limit, dist_range, &
187	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
188	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
189	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
190	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
191	end_time, first_call_lpm, galilei_transformation, humidity, &
192	icloud_scheme, intermediate_timestep_count, &
193	intermediate_timestep_count_max, large_scale_forcing, &
194	loop_optimization, lsf_surf, lsf_vert, masks, mid, nest_domain, &
195	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
196	ocean, on_device, passive_scalar, precipitation, &
197	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
198	run_coupled, simulated_time, simulated_time_chr, &
199	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
200	skip_time_do3d, skip_time_domask, skip_time_dopr, &
201	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
202	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
203	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
204	time_do3d, time_domask, time_dopr, time_dopr_av, &
205	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
206	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
207	time_run_control, time_since_reference_point, &
208	turbulence, &
209	turbulent_inflow, use_initial_profile_as_reference, &
210	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
211	ws_scheme_sca
212
213	USE cpulog, &
214	ONLY: cpu_log, log_point, log_point_s
215
216	USE indices, &
217	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
218	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
219
220	USE interaction_droplets_ptq_mod, &
221	ONLY: interaction_droplets_ptq
222
223	USE kinds
224
225	USE land_surface_model_mod, &
226	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
227	skip_time_do_lsm
228
229	USE ls_forcing_mod, &
230	ONLY: ls_forcing_surf, ls_forcing_vert
231
232	USE nudge_mod, &
233	ONLY: calc_tnudge, nudge_ref
234
235	USE particle_attributes, &
236	ONLY: particle_advection, particle_advection_start, &
237	use_sgs_for_particles, wang_kernel
238
239	USE pegrid
240
241	USE pmc_interface, &
242	ONLY: client_to_server, nested_run, nesting_mode, &
243	pmci_ensure_nest_mass_conservation, pmci_client_datatrans, &
244	pmci_client_initialize, pmci_client_synchronize, &
245	pmci_server_datatrans, pmci_server_initialize, &
246	pmci_server_synchronize, pmci_update_new, server_to_client
247
248	USE production_e_mod, &
249	ONLY: production_e_init
250
251	USE progress_bar, &
252	ONLY: finish_progress_bar, output_progress_bar
253
254	USE prognostic_equations_mod, &
255	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
256	prognostic_equations_vector
257
258	USE radiation_model_mod, &
259	ONLY: dt_radiation, force_radiation_call, radiation, &
260	radiation_clearsky, radiation_rrtmg, radiation_scheme, &
261	skip_time_do_radiation, time_radiation
262
263	USE statistics, &
264	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
265
266	USE surface_layer_fluxes_mod, &
267	ONLY: surface_layer_fluxes
268
269	USE user_actions_mod, &
270	ONLY: user_actions
271
272	IMPLICIT NONE
273
274	CHARACTER (LEN=9) :: time_to_string !<
275
276	INTEGER(iwp) :: netcdf_data_format_save !<
277
278	!
279	!-- At the beginning of a simulation determine the time step as well as
280	!-- determine and print out the run control parameters
281	IF ( simulated_time == 0.0_wp ) CALL timestep
282
283	!
284	!-- Synchronize the timestep in case of nested run.
285	!-- The server side must be called first
286	IF ( nested_run ) THEN
287	CALL pmci_server_synchronize
288	CALL pmci_client_synchronize
289	ENDIF
290
291	CALL run_control
292
293	!
294	!-- Data exchange between coupled models in case that a call has been omitted
295	!-- at the end of the previous run of a job chain.
296	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
297	!
298	!-- In case of model termination initiated by the local model the coupler
299	!-- must not be called because this would again cause an MPI hang.
300	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
301	CALL surface_coupler
302	time_coupling = time_coupling - dt_coupling
303	ENDDO
304	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
305	THEN
306	time_coupling = time_since_reference_point
307	ENDIF
308	ENDIF
309
310	IF ( nested_run ) THEN
311	!
312	!-- TO_DO: try to give more meaningful comments here
313	!-- Domain nesting: From server to client commmunication
314	!-- ( direction=SERVER_TO_CLIENT )
315	!-- Nest initial conditions
316	!
317	!-- Send initial condition data from server to client
318	CALL pmci_server_initialize
319	!
320	!-- Receive and interpolate initial data on client
321	CALL pmci_client_initialize
322	!
323	!-- TO_DO, maybe removed
324	!-- Obs. Nesting may be unnecessary at this point.
325	!
326	!-- Nest boundary conditions
327	CALL pmci_server_datatrans( server_to_client )
328	CALL pmci_client_datatrans( server_to_client )
329
330	IF ( nesting_mode == 'two-way' ) THEN
331	CALL pmci_server_datatrans( client_to_server )
332	CALL pmci_client_datatrans( client_to_server )
333	!
334	!-- Exchange_horiz is needed for all server-domains after the anterpolation
335	CALL exchange_horiz( u, nbgp )
336	CALL exchange_horiz( v, nbgp )
337	CALL exchange_horiz( w, nbgp )
338	CALL exchange_horiz( pt, nbgp )
339	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
340	intermediate_timestep_count = 0
341	CALL pres
342	ENDIF
343	!
344	!-- Correct the w top-BC in nest domains to ensure mass conservation.
345	!-- Copy the interpolated/anterpolated boundary values to the _p
346	!-- arrays, too, to make sure the interpolated/anterpolated boundary
347	!-- values are carried over from one RK inner step to another.
348	!-- These actions must not be done for the root domain.
349	IF ( nest_domain ) THEN
350	CALL pmci_ensure_nest_mass_conservation
351	CALL pmci_update_new
352	ENDIF
353
354	ENDIF
355
356	#if defined( __dvrp_graphics )
357	!
358	!-- Time measurement with dvrp software
359	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
360	#endif
361
362	CALL location_message( 'start with time-stepping', .TRUE. )
363	!
364	!-- Start of the time loop
365	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
366	.NOT. terminate_run )
367
368	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
369
370	!
371	!-- Determine size of next time step
372	IF ( simulated_time /= 0.0_wp ) THEN
373	CALL timestep
374
375	IF ( nested_run ) THEN
376	!
377	!-- TO_DO: try to give more detailed and meaningful comments here
378	!-- Server side must be called first
379	CALL pmci_server_synchronize
380	CALL pmci_client_synchronize
381	ENDIF
382	ENDIF
383
384
385	!
386	!-- Determine ug, vg and w_subs in dependence on data from external file
387	!-- LSF_DATA
388	IF ( large_scale_forcing .AND. lsf_vert ) THEN
389	CALL ls_forcing_vert ( simulated_time )
390	sums_ls_l = 0.0_wp
391	ENDIF
392
393	!
394	!-- Set pt_init and q_init to the current profiles taken from
395	!-- NUDGING_DATA
396	IF ( nudging ) THEN
397	CALL nudge_ref ( simulated_time )
398	!
399	!-- Store temperature gradient at the top boundary for possible Neumann
400	!-- boundary condition
401	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
402	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
403	ENDIF
404
405	!
406	!-- Execute the user-defined actions
407	CALL user_actions( 'before_timestep' )
408
409	!
410	!-- Start of intermediate step loop
411	intermediate_timestep_count = 0
412	DO WHILE ( intermediate_timestep_count < &
413	intermediate_timestep_count_max )
414
415	intermediate_timestep_count = intermediate_timestep_count + 1
416
417	!
418	!-- Set the steering factors for the prognostic equations which depend
419	!-- on the timestep scheme
420	CALL timestep_scheme_steering
421
422	!
423	!-- Calculate those variables needed in the tendency terms which need
424	!-- global communication
425	IF ( .NOT. use_single_reference_value .AND. &
426	.NOT. use_initial_profile_as_reference ) THEN
427	!
428	!-- Horizontally averaged profiles to be used as reference state in
429	!-- buoyancy terms (WARNING: only the respective last call of
430	!-- calc_mean_profile defines the reference state!)
431	IF ( .NOT. neutral ) THEN
432	CALL calc_mean_profile( pt, 4 )
433	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
434	ENDIF
435	IF ( ocean ) THEN
436	CALL calc_mean_profile( rho, 64 )
437	ref_state(:) = hom(:,1,64,0)
438	ENDIF
439	IF ( humidity ) THEN
440	CALL calc_mean_profile( vpt, 44 )
441	ref_state(:) = hom(:,1,44,0)
442	ENDIF
443
444	ENDIF
445
446	IF ( .NOT. constant_diffusion ) CALL production_e_init
447	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
448	intermediate_timestep_count == 1 ) CALL ws_statistics
449	!
450	!-- In case of nudging calculate current nudging time scale and horizontal
451	!-- means of u, v, pt and q
452	IF ( nudging ) THEN
453	CALL calc_tnudge( simulated_time )
454	CALL calc_mean_profile( u, 1 )
455	CALL calc_mean_profile( v, 2 )
456	CALL calc_mean_profile( pt, 4 )
457	CALL calc_mean_profile( q, 41 )
458	ENDIF
459
460	!
461	!-- Solve the prognostic equations. A fast cache optimized version with
462	!-- only one single loop is used in case of Piascek-Williams advection
463	!-- scheme. NEC vector machines use a different version, because
464	!-- in the other versions a good vectorization is prohibited due to
465	!-- inlining problems.
466	IF ( loop_optimization == 'cache' ) THEN
467	CALL prognostic_equations_cache
468	ELSEIF ( loop_optimization == 'vector' ) THEN
469	CALL prognostic_equations_vector
470	ELSEIF ( loop_optimization == 'acc' ) THEN
471	i_left = nxl; i_right = nxr
472	j_south = nys; j_north = nyn
473	CALL prognostic_equations_acc
474
475	! i_left = nxl; i_right = nxl+nbgp-1
476	! j_south = nys; j_north = nyn
477	! CALL prognostic_equations_acc
478	! i_left = nxr-nbgp+1; i_right = nxr
479	! j_south = nys; j_north = nyn
480	! CALL prognostic_equations_acc
481
482	!
483	!-- Exchange of ghost points (lateral boundary conditions)
484	IF ( background_communication ) THEN
485
486	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
487
488	send_receive = 'lr'
489	sendrecv_in_background = .TRUE.
490	req = 0
491	req_count = 0
492
493	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
494	on_device = .TRUE. ! to be removed after complete porting
495	ELSE ! of ghost point exchange
496	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
497	ENDIF
498
499	CALL exchange_horiz( u_p, nbgp )
500	CALL exchange_horiz( v_p, nbgp )
501	CALL exchange_horiz( w_p, nbgp )
502	CALL exchange_horiz( pt_p, nbgp )
503	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
504	IF ( ocean ) THEN
505	CALL exchange_horiz( sa_p, nbgp )
506	CALL exchange_horiz( rho, nbgp )
507	CALL exchange_horiz( prho, nbgp )
508	ENDIF
509	IF (humidity .OR. passive_scalar) THEN
510	CALL exchange_horiz( q_p, nbgp )
511	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
512	CALL exchange_horiz( qr_p, nbgp )
513	CALL exchange_horiz( nr_p, nbgp )
514	ENDIF
515	ENDIF
516	IF ( cloud_droplets ) THEN
517	CALL exchange_horiz( ql, nbgp )
518	CALL exchange_horiz( ql_c, nbgp )
519	CALL exchange_horiz( ql_v, nbgp )
520	CALL exchange_horiz( ql_vp, nbgp )
521	ENDIF
522	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
523	THEN
524	CALL exchange_horiz( diss, nbgp )
525	ENDIF
526
527	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
528	on_device = .FALSE. ! to be removed after complete porting
529	ELSE ! of ghost point exchange
530	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
531	ENDIF
532
533	sendrecv_in_background = .FALSE.
534
535	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
536
537	ENDIF
538
539	! i_left = nxl+nbgp; i_right = nxr-nbgp
540	! j_south = nys; j_north = nys+nbgp-1
541	! CALL prognostic_equations_acc
542	! i_left = nxl+nbgp; i_right = nxr-nbgp
543	! j_south = nyn-nbgp+1; j_north = nyn
544	! CALL prognostic_equations_acc
545
546	IF ( background_communication ) THEN
547	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
548	#if defined( __parallel )
549	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
550	#endif
551	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
552
553	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
554
555	send_receive = 'ns'
556	sendrecv_in_background = .TRUE.
557	req = 0
558	req_count = 0
559
560	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
561	on_device = .TRUE. ! to be removed after complete porting
562	ELSE ! of ghost point exchange
563	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
564	ENDIF
565
566	CALL exchange_horiz( u_p, nbgp )
567	CALL exchange_horiz( v_p, nbgp )
568	CALL exchange_horiz( w_p, nbgp )
569	CALL exchange_horiz( pt_p, nbgp )
570	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
571	IF ( ocean ) THEN
572	CALL exchange_horiz( sa_p, nbgp )
573	CALL exchange_horiz( rho, nbgp )
574	CALL exchange_horiz( prho, nbgp )
575	ENDIF
576	IF (humidity .OR. passive_scalar) THEN
577	CALL exchange_horiz( q_p, nbgp )
578	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
579	CALL exchange_horiz( qr_p, nbgp )
580	CALL exchange_horiz( nr_p, nbgp )
581	ENDIF
582	ENDIF
583	IF ( cloud_droplets ) THEN
584	CALL exchange_horiz( ql, nbgp )
585	CALL exchange_horiz( ql_c, nbgp )
586	CALL exchange_horiz( ql_v, nbgp )
587	CALL exchange_horiz( ql_vp, nbgp )
588	ENDIF
589	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
590	THEN
591	CALL exchange_horiz( diss, nbgp )
592	ENDIF
593
594	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
595	on_device = .FALSE. ! to be removed after complete porting
596	ELSE ! of ghost point exchange
597	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
598	ENDIF
599
600	sendrecv_in_background = .FALSE.
601
602	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
603
604	ENDIF
605
606	! i_left = nxl+nbgp; i_right = nxr-nbgp
607	! j_south = nys+nbgp; j_north = nyn-nbgp
608	! CALL prognostic_equations_acc
609
610	IF ( background_communication ) THEN
611	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
612	#if defined( __parallel )
613	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
614	#endif
615	send_receive = 'al'
616	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
617	ENDIF
618
619	ENDIF
620
621	!
622	!-- Particle transport/physics with the Lagrangian particle model
623	!-- (only once during intermediate steps, because it uses an Euler-step)
624	!-- ### particle model should be moved before prognostic_equations, in order
625	!-- to regard droplet interactions directly
626	IF ( particle_advection .AND. &
627	simulated_time >= particle_advection_start .AND. &
628	intermediate_timestep_count == 1 ) THEN
629	CALL lpm
630	first_call_lpm = .FALSE.
631	ENDIF
632
633	!
634	!-- Interaction of droplets with temperature and specific humidity.
635	!-- Droplet condensation and evaporation is calculated within
636	!-- advec_particles.
637	IF ( cloud_droplets .AND. &
638	intermediate_timestep_count == intermediate_timestep_count_max )&
639	THEN
640	CALL interaction_droplets_ptq
641	ENDIF
642
643	!
644	!-- Exchange of ghost points (lateral boundary conditions)
645	IF ( .NOT. background_communication ) THEN
646
647	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
648
649	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
650	on_device = .TRUE. ! to be removed after complete porting
651	ELSE ! of ghost point exchange
652	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
653	ENDIF
654
655	CALL exchange_horiz( u_p, nbgp )
656	CALL exchange_horiz( v_p, nbgp )
657	CALL exchange_horiz( w_p, nbgp )
658	CALL exchange_horiz( pt_p, nbgp )
659	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
660	IF ( ocean ) THEN
661	CALL exchange_horiz( sa_p, nbgp )
662	CALL exchange_horiz( rho, nbgp )
663	CALL exchange_horiz( prho, nbgp )
664	ENDIF
665	IF (humidity .OR. passive_scalar) THEN
666	CALL exchange_horiz( q_p, nbgp )
667	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
668	precipitation ) THEN
669	CALL exchange_horiz( qr_p, nbgp )
670	CALL exchange_horiz( nr_p, nbgp )
671	ENDIF
672	ENDIF
673	IF ( cloud_droplets ) THEN
674	CALL exchange_horiz( ql, nbgp )
675	CALL exchange_horiz( ql_c, nbgp )
676	CALL exchange_horiz( ql_v, nbgp )
677	CALL exchange_horiz( ql_vp, nbgp )
678	ENDIF
679	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
680	THEN
681	CALL exchange_horiz( diss, nbgp )
682	ENDIF
683
684	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
685	on_device = .FALSE. ! to be removed after complete porting
686	ELSE ! of ghost point exchange
687	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
688	ENDIF
689
690	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
691
692	ENDIF
693
694	!
695	!-- Boundary conditions for the prognostic quantities (except of the
696	!-- velocities at the outflow in case of a non-cyclic lateral wall)
697	CALL boundary_conds
698
699	!
700	!-- Swap the time levels in preparation for the next time step.
701	CALL swap_timelevel
702
703	IF ( nested_run ) THEN
704	!
705	!-- TO_DO: try to give more meaningful comments here
706	!-- Domain nesting
707	!-- Note that the nesting operations are omitted intentionally on the
708	!-- first two RK-substeps.
709	CALL cpu_log( log_point(60), 'nesting', 'start' )
710	!
711	!-- From server to client commmunication ( direction=SERVER_TO_CLIENT )
712	CALL pmci_server_datatrans( server_to_client )
713	CALL pmci_client_datatrans( server_to_client )
714
715	IF ( nesting_mode == 'two-way' ) THEN
716	!
717	!-- From client to server commmunication ( direction=CLIENT_TO_SERVER )
718	CALL pmci_server_datatrans( client_to_server )
719	CALL pmci_client_datatrans( client_to_server )
720	!
721	!-- Exchange_horiz is needed for all server-domains after the
722	!-- anterpolation
723	CALL exchange_horiz( u, nbgp )
724	CALL exchange_horiz( v, nbgp )
725	CALL exchange_horiz( w, nbgp )
726	CALL exchange_horiz( pt, nbgp )
727	IF ( humidity .OR. passive_scalar ) THEN
728	CALL exchange_horiz( q, nbgp )
729	ENDIF
730	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e, nbgp )
731	ENDIF
732	!
733	!-- Correct the w top-BC in nest domains to ensure mass conservation.
734	!-- This action must never be done for the root domain.
735	IF ( nest_domain ) THEN
736	CALL pmci_ensure_nest_mass_conservation
737	!
738	!-- pmc_update_new is not necessary if nesting is made at each
739	!-- substep
740	CALL pmci_update_new
741	ENDIF
742
743	CALL cpu_log( log_point(60), 'nesting', 'stop' )
744
745	ENDIF
746
747	!
748	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
749	!-- when a sloping surface is used
750	IF ( sloping_surface ) THEN
751	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
752	pt_slope_offset
753	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
754	pt_slope_offset
755	ENDIF
756
757	!
758	!-- Impose a turbulent inflow using the recycling method
759	IF ( turbulent_inflow ) CALL inflow_turbulence
760
761	!
762	!-- Impose a random perturbation on the horizontal velocity field
763	IF ( create_disturbances .AND. &
764	( call_psolver_at_all_substeps .AND. &
765	intermediate_timestep_count == intermediate_timestep_count_max )&
766	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
767	intermediate_timestep_count == 1 ) ) &
768	THEN
769	time_disturb = time_disturb + dt_3d
770	IF ( time_disturb >= dt_disturb ) THEN
771	!$acc update host( u, v )
772	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
773	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
774	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
775	CALL disturb_field( nzb_u_inner, tend, u )
776	CALL disturb_field( nzb_v_inner, tend, v )
777	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
778	!
779	!-- Runs with a non-cyclic lateral wall need perturbations
780	!-- near the inflow throughout the whole simulation
781	dist_range = 1
782	CALL disturb_field( nzb_u_inner, tend, u )
783	CALL disturb_field( nzb_v_inner, tend, v )
784	dist_range = 0
785	ENDIF
786	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
787	!$acc update device( u, v )
788	time_disturb = time_disturb - dt_disturb
789	ENDIF
790	ENDIF
791
792	!
793	!-- Reduce the velocity divergence via the equation for perturbation
794	!-- pressure.
795	IF ( intermediate_timestep_count == 1 .OR. &
796	call_psolver_at_all_substeps ) THEN
797	CALL pres
798	ENDIF
799
800	!
801	!-- If required, compute liquid water content
802	IF ( cloud_physics ) THEN
803	CALL calc_liquid_water_content
804	!$acc update device( ql )
805	ENDIF
806	!
807	!-- If required, compute virtual potential temperature
808	IF ( humidity ) THEN
809	CALL compute_vpt
810	!$acc update device( vpt )
811	ENDIF
812
813	!
814	!-- Compute the diffusion quantities
815	IF ( .NOT. constant_diffusion ) THEN
816
817	!
818	!-- Determine surface fluxes shf and qsws and surface values
819	!-- pt_surface and q_surface in dependence on data from external
820	!-- file LSF_DATA respectively
821	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
822	intermediate_timestep_count == intermediate_timestep_count_max )&
823	THEN
824	CALL ls_forcing_surf ( simulated_time )
825	ENDIF
826
827	!
828	!-- First the vertical fluxes in the surface (constant flux) layer are computed
829	IF ( constant_flux_layer ) THEN
830	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
831	CALL surface_layer_fluxes
832	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
833	ENDIF
834
835	!
836	!-- If required, solve the energy balance for the surface and run soil
837	!-- model
838	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
839
840	CALL cpu_log( log_point(54), 'land_surface', 'start' )
841	CALL lsm_energy_balance
842	CALL lsm_soil_model
843	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
844	ENDIF
845	!
846	!-- Compute the diffusion coefficients
847	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
848	IF ( .NOT. humidity ) THEN
849	IF ( ocean ) THEN
850	CALL diffusivities( prho, prho_reference )
851	ELSE
852	CALL diffusivities( pt, pt_reference )
853	ENDIF
854	ELSE
855	CALL diffusivities( vpt, pt_reference )
856	ENDIF
857	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
858
859	ENDIF
860
861	!
862	!-- If required, calculate radiative fluxes and heating rates
863	IF ( radiation .AND. intermediate_timestep_count &
864	== intermediate_timestep_count_max .AND. simulated_time > &
865	skip_time_do_radiation ) THEN
866
867	time_radiation = time_radiation + dt_3d
868
869	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
870	THEN
871
872	CALL cpu_log( log_point(50), 'radiation', 'start' )
873
874	IF ( .NOT. force_radiation_call ) THEN
875	time_radiation = time_radiation - dt_radiation
876	ELSE
877	WRITE(9,*) "Unscheduled radiation call at ", simulated_time
878	CALL LOCAL_FLUSH ( 9 )
879	ENDIF
880
881	IF ( radiation_scheme == 'clear-sky' ) THEN
882	CALL radiation_clearsky
883	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
884	CALL radiation_rrtmg
885	ENDIF
886
887	CALL cpu_log( log_point(50), 'radiation', 'stop' )
888	ENDIF
889	ENDIF
890
891	ENDDO ! Intermediate step loop
892
893	!
894	!-- Increase simulation time and output times
895	nr_timesteps_this_run = nr_timesteps_this_run + 1
896	current_timestep_number = current_timestep_number + 1
897	simulated_time = simulated_time + dt_3d
898	simulated_time_chr = time_to_string( simulated_time )
899	time_since_reference_point = simulated_time - coupling_start_time
900
901	IF ( simulated_time >= skip_time_data_output_av ) THEN
902	time_do_av = time_do_av + dt_3d
903	ENDIF
904	IF ( simulated_time >= skip_time_do2d_xy ) THEN
905	time_do2d_xy = time_do2d_xy + dt_3d
906	ENDIF
907	IF ( simulated_time >= skip_time_do2d_xz ) THEN
908	time_do2d_xz = time_do2d_xz + dt_3d
909	ENDIF
910	IF ( simulated_time >= skip_time_do2d_yz ) THEN
911	time_do2d_yz = time_do2d_yz + dt_3d
912	ENDIF
913	IF ( simulated_time >= skip_time_do3d ) THEN
914	time_do3d = time_do3d + dt_3d
915	ENDIF
916	DO mid = 1, masks
917	IF ( simulated_time >= skip_time_domask(mid) ) THEN
918	time_domask(mid)= time_domask(mid) + dt_3d
919	ENDIF
920	ENDDO
921	time_dvrp = time_dvrp + dt_3d
922	IF ( simulated_time >= skip_time_dosp ) THEN
923	time_dosp = time_dosp + dt_3d
924	ENDIF
925	time_dots = time_dots + dt_3d
926	IF ( .NOT. first_call_lpm ) THEN
927	time_dopts = time_dopts + dt_3d
928	ENDIF
929	IF ( simulated_time >= skip_time_dopr ) THEN
930	time_dopr = time_dopr + dt_3d
931	ENDIF
932	time_dopr_listing = time_dopr_listing + dt_3d
933	time_run_control = time_run_control + dt_3d
934
935	!
936	!-- Data exchange between coupled models
937	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
938	time_coupling = time_coupling + dt_3d
939
940	!
941	!-- In case of model termination initiated by the local model
942	!-- (terminate_coupled > 0), the coupler must be skipped because it would
943	!-- cause an MPI intercomminucation hang.
944	!-- If necessary, the coupler will be called at the beginning of the
945	!-- next restart run.
946	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
947	CALL surface_coupler
948	time_coupling = time_coupling - dt_coupling
949	ENDDO
950	ENDIF
951
952	!
953	!-- Execute user-defined actions
954	CALL user_actions( 'after_integration' )
955
956	!
957	!-- If Galilei transformation is used, determine the distance that the
958	!-- model has moved so far
959	IF ( galilei_transformation ) THEN
960	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
961	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
962	ENDIF
963
964	!
965	!-- Check, if restart is necessary (because cpu-time is expiring or
966	!-- because it is forced by user) and set stop flag
967	!-- This call is skipped if the remote model has already initiated a restart.
968	IF ( .NOT. terminate_run ) CALL check_for_restart
969
970	!
971	!-- Carry out statistical analysis and output at the requested output times.
972	!-- The MOD function is used for calculating the output time counters (like
973	!-- time_dopr) in order to regard a possible decrease of the output time
974	!-- interval in case of restart runs
975
976	!
977	!-- Set a flag indicating that so far no statistics have been created
978	!-- for this time step
979	flow_statistics_called = .FALSE.
980
981	!
982	!-- If required, call flow_statistics for averaging in time
983	IF ( averaging_interval_pr /= 0.0_wp .AND. &
984	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
985	simulated_time >= skip_time_dopr ) THEN
986	time_dopr_av = time_dopr_av + dt_3d
987	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
988	do_sum = .TRUE.
989	time_dopr_av = MOD( time_dopr_av, &
990	MAX( dt_averaging_input_pr, dt_3d ) )
991	ENDIF
992	ENDIF
993	IF ( do_sum ) CALL flow_statistics
994
995	!
996	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
997	IF ( averaging_interval /= 0.0_wp .AND. &
998	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
999	simulated_time >= skip_time_data_output_av ) &
1000	THEN
1001	time_do_sla = time_do_sla + dt_3d
1002	IF ( time_do_sla >= dt_averaging_input ) THEN
1003	CALL sum_up_3d_data
1004	average_count_3d = average_count_3d + 1
1005	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1006	ENDIF
1007	ENDIF
1008
1009	!
1010	!-- Calculate spectra for time averaging
1011	IF ( averaging_interval_sp /= 0.0_wp .AND. &
1012	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
1013	simulated_time >= skip_time_dosp ) THEN
1014	time_dosp_av = time_dosp_av + dt_3d
1015	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
1016	CALL calc_spectra
1017	time_dosp_av = MOD( time_dosp_av, &
1018	MAX( dt_averaging_input_pr, dt_3d ) )
1019	ENDIF
1020	ENDIF
1021
1022	!
1023	!-- Computation and output of run control parameters.
1024	!-- This is also done whenever perturbations have been imposed
1025	IF ( time_run_control >= dt_run_control .OR. &
1026	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
1027	THEN
1028	CALL run_control
1029	IF ( time_run_control >= dt_run_control ) THEN
1030	time_run_control = MOD( time_run_control, &
1031	MAX( dt_run_control, dt_3d ) )
1032	ENDIF
1033	ENDIF
1034
1035	!
1036	!-- Profile output (ASCII) on file
1037	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
1038	CALL print_1d
1039	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1040	dt_3d ) )
1041	ENDIF
1042
1043	!
1044	!-- Graphic output for PROFIL
1045	IF ( time_dopr >= dt_dopr ) THEN
1046	IF ( dopr_n /= 0 ) CALL data_output_profiles
1047	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1048	time_dopr_av = 0.0_wp ! due to averaging (see above)
1049	ENDIF
1050
1051	!
1052	!-- Graphic output for time series
1053	IF ( time_dots >= dt_dots ) THEN
1054	CALL data_output_tseries
1055	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1056	ENDIF
1057
1058	!
1059	!-- Output of spectra (formatted for use with PROFIL), in case of no
1060	!-- time averaging, spectra has to be calculated before
1061	IF ( time_dosp >= dt_dosp ) THEN
1062	IF ( average_count_sp == 0 ) CALL calc_spectra
1063	CALL data_output_spectra
1064	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1065	ENDIF
1066
1067	!
1068	!-- 2d-data output (cross-sections)
1069	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
1070	CALL data_output_2d( 'xy', 0 )
1071	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1072	ENDIF
1073	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
1074	CALL data_output_2d( 'xz', 0 )
1075	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1076	ENDIF
1077	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
1078	CALL data_output_2d( 'yz', 0 )
1079	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1080	ENDIF
1081
1082	!
1083	!-- 3d-data output (volume data)
1084	IF ( time_do3d >= dt_do3d ) THEN
1085	CALL data_output_3d( 0 )
1086	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1087	ENDIF
1088
1089	!
1090	!-- masked data output
1091	!-- Parallel netcdf output is not tested so far for masked data, hence
1092	!-- netcdf_data_format is switched back to non-paralell output.
1093	netcdf_data_format_save = netcdf_data_format
1094	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1095	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1096	DO mid = 1, masks
1097	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
1098	CALL data_output_mask( 0 )
1099	time_domask(mid) = MOD( time_domask(mid), &
1100	MAX( dt_domask(mid), dt_3d ) )
1101	ENDIF
1102	ENDDO
1103	netcdf_data_format = netcdf_data_format_save
1104
1105	!
1106	!-- Output of time-averaged 2d/3d/masked data
1107	IF ( time_do_av >= dt_data_output_av ) THEN
1108	CALL average_3d_data
1109	CALL data_output_2d( 'xy', 1 )
1110	CALL data_output_2d( 'xz', 1 )
1111	CALL data_output_2d( 'yz', 1 )
1112	CALL data_output_3d( 1 )
1113	!-- Parallel netcdf output is not tested so far for masked data, hence
1114	!-- netcdf_data_format is switched back to non-paralell output.
1115	netcdf_data_format_save = netcdf_data_format
1116	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1117	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1118	DO mid = 1, masks
1119	CALL data_output_mask( 1 )
1120	ENDDO
1121	netcdf_data_format = netcdf_data_format_save
1122	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1123	ENDIF
1124
1125	!
1126	!-- Output of particle time series
1127	IF ( particle_advection ) THEN
1128	IF ( time_dopts >= dt_dopts .OR. &
1129	( simulated_time >= particle_advection_start .AND. &
1130	first_call_lpm ) ) THEN
1131	CALL data_output_ptseries
1132	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1133	ENDIF
1134	ENDIF
1135
1136	!
1137	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1138	#if defined( __dvrp_graphics )
1139	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1140	#endif
1141	IF ( time_dvrp >= dt_dvrp ) THEN
1142	CALL data_output_dvrp
1143	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1144	ENDIF
1145	#if defined( __dvrp_graphics )
1146	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1147	#endif
1148
1149	!
1150	!-- If required, set the heat flux for the next time step at a random value
1151	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1152
1153	!
1154	!-- Execute user-defined actions
1155	CALL user_actions( 'after_timestep' )
1156
1157	!
1158	!-- Output elapsed simulated time in form of a progress bar on stdout
1159	IF ( myid == 0 ) CALL output_progress_bar
1160
1161	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1162
1163
1164	ENDDO ! time loop
1165
1166	IF ( myid == 0 ) CALL finish_progress_bar
1167
1168	#if defined( __dvrp_graphics )
1169	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1170	#endif
1171
1172	CALL location_message( 'finished time-stepping', .TRUE. )
1173
1174	END SUBROUTINE time_integration

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