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source: palm/trunk/SOURCE/time_integration.f90 @ 1745

Last change on this file since 1745 was 1737, checked in by raasch, 8 years ago
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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	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: time_integration.f90 1737 2015-12-04 08:59:40Z gronemeier $
26	!
27	! 1736 2015-12-04 08:56:33Z raasch
28	! no perturbations added to total domain if energy limit has been set zero
29	!
30	! 1691 2015-10-26 16:17:44Z maronga
31	! Added option for spin-ups without land surface and radiation models. Moved calls
32	! for radiation and lan surface schemes.
33	!
34	! 1682 2015-10-07 23:56:08Z knoop
35	! Code annotations made doxygen readable
36	!
37	! 1671 2015-09-25 03:29:37Z raasch
38	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
39	! for particles
40	!
41	! 1585 2015-04-30 07:05:52Z maronga
42	! Moved call of radiation scheme. Added support for RRTM
43	!
44	! 1551 2015-03-03 14:18:16Z maronga
45	! Added interface for different radiation schemes.
46	!
47	! 1496 2014-12-02 17:25:50Z maronga
48	! Added calls for the land surface model and radiation scheme
49	!
50	! 1402 2014-05-09 14:25:13Z raasch
51	! location messages modified
52	!
53	! 1384 2014-05-02 14:31:06Z raasch
54	! location messages added
55	!
56	! 1380 2014-04-28 12:40:45Z heinze
57	! CALL of nudge_ref added
58	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
59	!
60	! 1365 2014-04-22 15:03:56Z boeske
61	! Reset sums_ls_l to zero at each timestep
62	! +sums_ls_l
63	! Calculation of reference state (previously in subroutine calc_mean_profile)
64
65	! 1342 2014-03-26 17:04:47Z kanani
66	! REAL constants defined as wp-kind
67	!
68	! 1320 2014-03-20 08:40:49Z raasch
69	! ONLY-attribute added to USE-statements,
70	! kind-parameters added to all INTEGER and REAL declaration statements,
71	! kinds are defined in new module kinds,
72	! old module precision_kind is removed,
73	! revision history before 2012 removed,
74	! comment fields (!:) to be used for variable explanations added to
75	! all variable declaration statements
76	! 1318 2014-03-17 13:35:16Z raasch
77	! module interfaces removed
78	!
79	! 1308 2014-03-13 14:58:42Z fricke
80	! +netcdf_data_format_save
81	! For masked data, parallel netcdf output is not tested so far, hence
82	! netcdf_data_format is switched back to non-paralell output.
83	!
84	! 1276 2014-01-15 13:40:41Z heinze
85	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
86	!
87	! 1257 2013-11-08 15:18:40Z raasch
88	! acc-update-host directive for timestep removed
89	!
90	! 1241 2013-10-30 11:36:58Z heinze
91	! Generalize calc_mean_profile for wider use
92	! Determine shf and qsws in dependence on data from LSF_DATA
93	! Determine ug and vg in dependence on data from LSF_DATA
94	! 1221 2013-09-10 08:59:13Z raasch
95	! host update of arrays before timestep is called
96	!
97	! 1179 2013-06-14 05:57:58Z raasch
98	! mean profiles for reference state are only calculated if required,
99	! small bugfix for background communication
100	!
101	! 1171 2013-05-30 11:27:45Z raasch
102	! split of prognostic_equations deactivated (comment lines), for the time being
103	!
104	! 1128 2013-04-12 06:19:32Z raasch
105	! asynchronous transfer of ghost point data realized for acc-optimized version:
106	! prognostic_equations are first called two times for those points required for
107	! the left-right and north-south exchange, respectively, and then for the
108	! remaining points,
109	! those parts requiring global communication moved from prognostic_equations to
110	! here
111	!
112	! 1115 2013-03-26 18:16:16Z hoffmann
113	! calculation of qr and nr is restricted to precipitation
114	!
115	! 1113 2013-03-10 02:48:14Z raasch
116	! GPU-porting of boundary conditions,
117	! openACC directives updated
118	! formal parameter removed from routine boundary_conds
119	!
120	! 1111 2013-03-08 23:54:10Z raasch
121	! +internal timestep counter for cpu statistics added,
122	! openACC directives updated
123	!
124	! 1092 2013-02-02 11:24:22Z raasch
125	! unused variables removed
126	!
127	! 1065 2012-11-22 17:42:36Z hoffmann
128	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
129	!
130	! 1053 2012-11-13 17:11:03Z hoffmann
131	! exchange of ghost points for nr, qr added
132	!
133	! 1036 2012-10-22 13:43:42Z raasch
134	! code put under GPL (PALM 3.9)
135	!
136	! 1019 2012-09-28 06:46:45Z raasch
137	! non-optimized version of prognostic_equations removed
138	!
139	! 1015 2012-09-27 09:23:24Z raasch
140	! +call of prognostic_equations_acc
141	!
142	! 1001 2012-09-13 14:08:46Z raasch
143	! all actions concerning leapfrog- and upstream-spline-scheme removed
144	!
145	! 849 2012-03-15 10:35:09Z raasch
146	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
147	!
148	! 825 2012-02-19 03:03:44Z raasch
149	! wang_collision_kernel renamed wang_kernel
150	!
151	! Revision 1.1 1997/08/11 06:19:04 raasch
152	! Initial revision
153	!
154	!
155	! Description:
156	! ------------
157	!> Integration in time of the model equations, statistical analysis and graphic
158	!> output
159	!------------------------------------------------------------------------------!
160	SUBROUTINE time_integration
161
162
163	USE advec_ws, &
164	ONLY: ws_statistics
165
166	USE arrays_3d, &
167	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
168	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
169	u_p, v, vpt, v_p, w_p
170
171	USE calc_mean_profile_mod, &
172	ONLY: calc_mean_profile
173
174	USE control_parameters, &
175	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
176	average_count_sp, averaging_interval, averaging_interval_pr, &
177	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
178	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
179	cloud_physics, constant_flux_layer, constant_heatflux, &
180	create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
181	coupling_start_time, current_timestep_number, &
182	disturbance_created, disturbance_energy_limit, dist_range, &
183	do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr, &
184	dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy, &
185	dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
186	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
187	end_time, first_call_lpm, galilei_transformation, humidity, &
188	icloud_scheme, intermediate_timestep_count, &
189	intermediate_timestep_count_max, large_scale_forcing, &
190	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
191	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
192	ocean, on_device, passive_scalar, precipitation, &
193	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
194	run_coupled, simulated_time, simulated_time_chr, &
195	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
196	skip_time_do3d, skip_time_domask, skip_time_dopr, &
197	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
198	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
199	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
200	time_do3d, time_domask, time_dopr, time_dopr_av, &
201	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
202	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
203	time_run_control, time_since_reference_point, &
204	turbulence, &
205	turbulent_inflow, use_initial_profile_as_reference, &
206	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
207	ws_scheme_sca
208
209	USE cpulog, &
210	ONLY: cpu_log, log_point, log_point_s
211
212	USE indices, &
213	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
214	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
215
216	USE interaction_droplets_ptq_mod, &
217	ONLY: interaction_droplets_ptq
218
219	USE kinds
220
221	USE land_surface_model_mod, &
222	ONLY: land_surface, lsm_energy_balance, lsm_soil_model, &
223	skip_time_do_lsm
224
225	USE ls_forcing_mod, &
226	ONLY: ls_forcing_surf, ls_forcing_vert
227
228	USE nudge_mod, &
229	ONLY: calc_tnudge, nudge_ref
230
231	USE particle_attributes, &
232	ONLY: particle_advection, particle_advection_start, &
233	use_sgs_for_particles, wang_kernel
234
235	USE pegrid
236
237	USE production_e_mod, &
238	ONLY: production_e_init
239
240	USE progress_bar, &
241	ONLY: finish_progress_bar, output_progress_bar
242
243	USE prognostic_equations_mod, &
244	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
245	prognostic_equations_vector
246
247	USE radiation_model_mod, &
248	ONLY: dt_radiation, force_radiation_call, radiation, &
249	radiation_clearsky, radiation_rrtmg, radiation_scheme, &
250	skip_time_do_radiation, time_radiation
251
252	USE statistics, &
253	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
254
255	USE surface_layer_fluxes_mod, &
256	ONLY: surface_layer_fluxes
257
258	USE user_actions_mod, &
259	ONLY: user_actions
260
261	IMPLICIT NONE
262
263	CHARACTER (LEN=9) :: time_to_string !<
264
265	INTEGER(iwp) :: netcdf_data_format_save !<
266
267	!
268	!-- At the beginning of a simulation determine the time step as well as
269	!-- determine and print out the run control parameters
270	IF ( simulated_time == 0.0_wp ) CALL timestep
271
272	CALL run_control
273
274
275	!
276	!-- Data exchange between coupled models in case that a call has been omitted
277	!-- at the end of the previous run of a job chain.
278	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
279	!
280	!-- In case of model termination initiated by the local model the coupler
281	!-- must not be called because this would again cause an MPI hang.
282	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
283	CALL surface_coupler
284	time_coupling = time_coupling - dt_coupling
285	ENDDO
286	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
287	THEN
288	time_coupling = time_since_reference_point
289	ENDIF
290	ENDIF
291
292
293	#if defined( __dvrp_graphics )
294	!
295	!-- Time measurement with dvrp software
296	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
297	#endif
298
299	CALL location_message( 'start with time-stepping', .TRUE. )
300	!
301	!-- Start of the time loop
302	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
303	.NOT. terminate_run )
304
305	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
306
307	!
308	!-- Determine size of next time step
309	IF ( simulated_time /= 0.0_wp ) THEN
310	CALL timestep
311	ENDIF
312
313	!
314	!-- Determine ug, vg and w_subs in dependence on data from external file
315	!-- LSF_DATA
316	IF ( large_scale_forcing .AND. lsf_vert ) THEN
317	CALL ls_forcing_vert ( simulated_time )
318	sums_ls_l = 0.0_wp
319	ENDIF
320
321	!
322	!-- Set pt_init and q_init to the current profiles taken from
323	!-- NUDGING_DATA
324	IF ( nudging ) THEN
325	CALL nudge_ref ( simulated_time )
326	!
327	!-- Store temperature gradient at the top boundary for possible Neumann
328	!-- boundary condition
329	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
330	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
331	ENDIF
332
333	!
334	!-- Execute the user-defined actions
335	CALL user_actions( 'before_timestep' )
336
337	!
338	!-- Start of intermediate step loop
339	intermediate_timestep_count = 0
340	DO WHILE ( intermediate_timestep_count < &
341	intermediate_timestep_count_max )
342
343	intermediate_timestep_count = intermediate_timestep_count + 1
344
345	!
346	!-- Set the steering factors for the prognostic equations which depend
347	!-- on the timestep scheme
348	CALL timestep_scheme_steering
349
350	!
351	!-- Calculate those variables needed in the tendency terms which need
352	!-- global communication
353	IF ( .NOT. use_single_reference_value .AND. &
354	.NOT. use_initial_profile_as_reference ) THEN
355	!
356	!-- Horizontally averaged profiles to be used as reference state in
357	!-- buoyancy terms (WARNING: only the respective last call of
358	!-- calc_mean_profile defines the reference state!)
359	IF ( .NOT. neutral ) THEN
360	CALL calc_mean_profile( pt, 4 )
361	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
362	ENDIF
363	IF ( ocean ) THEN
364	CALL calc_mean_profile( rho, 64 )
365	ref_state(:) = hom(:,1,64,0)
366	ENDIF
367	IF ( humidity ) THEN
368	CALL calc_mean_profile( vpt, 44 )
369	ref_state(:) = hom(:,1,44,0)
370	ENDIF
371
372	ENDIF
373
374	IF ( .NOT. constant_diffusion ) CALL production_e_init
375	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
376	intermediate_timestep_count == 1 ) CALL ws_statistics
377	!
378	!-- In case of nudging calculate current nudging time scale and horizontal
379	!-- means of u, v, pt and q
380	IF ( nudging ) THEN
381	CALL calc_tnudge( simulated_time )
382	CALL calc_mean_profile( u, 1 )
383	CALL calc_mean_profile( v, 2 )
384	CALL calc_mean_profile( pt, 4 )
385	CALL calc_mean_profile( q, 41 )
386	ENDIF
387
388	!
389	!-- Solve the prognostic equations. A fast cache optimized version with
390	!-- only one single loop is used in case of Piascek-Williams advection
391	!-- scheme. NEC vector machines use a different version, because
392	!-- in the other versions a good vectorization is prohibited due to
393	!-- inlining problems.
394	IF ( loop_optimization == 'cache' ) THEN
395	CALL prognostic_equations_cache
396	ELSEIF ( loop_optimization == 'vector' ) THEN
397	CALL prognostic_equations_vector
398	ELSEIF ( loop_optimization == 'acc' ) THEN
399	i_left = nxl; i_right = nxr
400	j_south = nys; j_north = nyn
401	CALL prognostic_equations_acc
402
403	! i_left = nxl; i_right = nxl+nbgp-1
404	! j_south = nys; j_north = nyn
405	! CALL prognostic_equations_acc
406	! i_left = nxr-nbgp+1; i_right = nxr
407	! j_south = nys; j_north = nyn
408	! CALL prognostic_equations_acc
409
410	!
411	!-- Exchange of ghost points (lateral boundary conditions)
412	IF ( background_communication ) THEN
413
414	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
415
416	send_receive = 'lr'
417	sendrecv_in_background = .TRUE.
418	req = 0
419	req_count = 0
420
421	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
422	on_device = .TRUE. ! to be removed after complete porting
423	ELSE ! of ghost point exchange
424	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
425	ENDIF
426
427	CALL exchange_horiz( u_p, nbgp )
428	CALL exchange_horiz( v_p, nbgp )
429	CALL exchange_horiz( w_p, nbgp )
430	CALL exchange_horiz( pt_p, nbgp )
431	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
432	IF ( ocean ) THEN
433	CALL exchange_horiz( sa_p, nbgp )
434	CALL exchange_horiz( rho, nbgp )
435	CALL exchange_horiz( prho, nbgp )
436	ENDIF
437	IF (humidity .OR. passive_scalar) THEN
438	CALL exchange_horiz( q_p, nbgp )
439	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
440	CALL exchange_horiz( qr_p, nbgp )
441	CALL exchange_horiz( nr_p, nbgp )
442	ENDIF
443	ENDIF
444	IF ( cloud_droplets ) THEN
445	CALL exchange_horiz( ql, nbgp )
446	CALL exchange_horiz( ql_c, nbgp )
447	CALL exchange_horiz( ql_v, nbgp )
448	CALL exchange_horiz( ql_vp, nbgp )
449	ENDIF
450	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
451	THEN
452	CALL exchange_horiz( diss, nbgp )
453	ENDIF
454
455	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
456	on_device = .FALSE. ! to be removed after complete porting
457	ELSE ! of ghost point exchange
458	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
459	ENDIF
460
461	sendrecv_in_background = .FALSE.
462
463	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
464
465	ENDIF
466
467	! i_left = nxl+nbgp; i_right = nxr-nbgp
468	! j_south = nys; j_north = nys+nbgp-1
469	! CALL prognostic_equations_acc
470	! i_left = nxl+nbgp; i_right = nxr-nbgp
471	! j_south = nyn-nbgp+1; j_north = nyn
472	! CALL prognostic_equations_acc
473
474	IF ( background_communication ) THEN
475	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
476	#if defined( __parallel )
477	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
478	#endif
479	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
480
481	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
482
483	send_receive = 'ns'
484	sendrecv_in_background = .TRUE.
485	req = 0
486	req_count = 0
487
488	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
489	on_device = .TRUE. ! to be removed after complete porting
490	ELSE ! of ghost point exchange
491	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
492	ENDIF
493
494	CALL exchange_horiz( u_p, nbgp )
495	CALL exchange_horiz( v_p, nbgp )
496	CALL exchange_horiz( w_p, nbgp )
497	CALL exchange_horiz( pt_p, nbgp )
498	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
499	IF ( ocean ) THEN
500	CALL exchange_horiz( sa_p, nbgp )
501	CALL exchange_horiz( rho, nbgp )
502	CALL exchange_horiz( prho, nbgp )
503	ENDIF
504	IF (humidity .OR. passive_scalar) THEN
505	CALL exchange_horiz( q_p, nbgp )
506	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
507	CALL exchange_horiz( qr_p, nbgp )
508	CALL exchange_horiz( nr_p, nbgp )
509	ENDIF
510	ENDIF
511	IF ( cloud_droplets ) THEN
512	CALL exchange_horiz( ql, nbgp )
513	CALL exchange_horiz( ql_c, nbgp )
514	CALL exchange_horiz( ql_v, nbgp )
515	CALL exchange_horiz( ql_vp, nbgp )
516	ENDIF
517	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
518	THEN
519	CALL exchange_horiz( diss, nbgp )
520	ENDIF
521
522	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
523	on_device = .FALSE. ! to be removed after complete porting
524	ELSE ! of ghost point exchange
525	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
526	ENDIF
527
528	sendrecv_in_background = .FALSE.
529
530	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
531
532	ENDIF
533
534	! i_left = nxl+nbgp; i_right = nxr-nbgp
535	! j_south = nys+nbgp; j_north = nyn-nbgp
536	! CALL prognostic_equations_acc
537
538	IF ( background_communication ) THEN
539	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
540	#if defined( __parallel )
541	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
542	#endif
543	send_receive = 'al'
544	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
545	ENDIF
546
547	ENDIF
548
549	!
550	!-- Particle transport/physics with the Lagrangian particle model
551	!-- (only once during intermediate steps, because it uses an Euler-step)
552	!-- ### particle model should be moved before prognostic_equations, in order
553	!-- to regard droplet interactions directly
554	IF ( particle_advection .AND. &
555	simulated_time >= particle_advection_start .AND. &
556	intermediate_timestep_count == 1 ) THEN
557	CALL lpm
558	first_call_lpm = .FALSE.
559	ENDIF
560
561	!
562	!-- Interaction of droplets with temperature and specific humidity.
563	!-- Droplet condensation and evaporation is calculated within
564	!-- advec_particles.
565	IF ( cloud_droplets .AND. &
566	intermediate_timestep_count == intermediate_timestep_count_max )&
567	THEN
568	CALL interaction_droplets_ptq
569	ENDIF
570
571	!
572	!-- Exchange of ghost points (lateral boundary conditions)
573	IF ( .NOT. background_communication ) THEN
574
575	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
576
577	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
578	on_device = .TRUE. ! to be removed after complete porting
579	ELSE ! of ghost point exchange
580	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
581	ENDIF
582
583	CALL exchange_horiz( u_p, nbgp )
584	CALL exchange_horiz( v_p, nbgp )
585	CALL exchange_horiz( w_p, nbgp )
586	CALL exchange_horiz( pt_p, nbgp )
587	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
588	IF ( ocean ) THEN
589	CALL exchange_horiz( sa_p, nbgp )
590	CALL exchange_horiz( rho, nbgp )
591	CALL exchange_horiz( prho, nbgp )
592	ENDIF
593	IF (humidity .OR. passive_scalar) THEN
594	CALL exchange_horiz( q_p, nbgp )
595	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
596	precipitation ) THEN
597	CALL exchange_horiz( qr_p, nbgp )
598	CALL exchange_horiz( nr_p, nbgp )
599	ENDIF
600	ENDIF
601	IF ( cloud_droplets ) THEN
602	CALL exchange_horiz( ql, nbgp )
603	CALL exchange_horiz( ql_c, nbgp )
604	CALL exchange_horiz( ql_v, nbgp )
605	CALL exchange_horiz( ql_vp, nbgp )
606	ENDIF
607	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
608	THEN
609	CALL exchange_horiz( diss, nbgp )
610	ENDIF
611
612	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
613	on_device = .FALSE. ! to be removed after complete porting
614	ELSE ! of ghost point exchange
615	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
616	ENDIF
617
618	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
619
620	ENDIF
621
622	!
623	!-- Boundary conditions for the prognostic quantities (except of the
624	!-- velocities at the outflow in case of a non-cyclic lateral wall)
625	CALL boundary_conds
626
627	!
628	!-- Swap the time levels in preparation for the next time step.
629	CALL swap_timelevel
630
631	!
632	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
633	!-- when a sloping surface is used
634	IF ( sloping_surface ) THEN
635	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
636	pt_slope_offset
637	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
638	pt_slope_offset
639	ENDIF
640
641	!
642	!-- Impose a turbulent inflow using the recycling method
643	IF ( turbulent_inflow ) CALL inflow_turbulence
644
645	!
646	!-- Impose a random perturbation on the horizontal velocity field
647	IF ( create_disturbances .AND. &
648	( call_psolver_at_all_substeps .AND. &
649	intermediate_timestep_count == intermediate_timestep_count_max )&
650	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
651	intermediate_timestep_count == 1 ) ) &
652	THEN
653	time_disturb = time_disturb + dt_3d
654	IF ( time_disturb >= dt_disturb ) THEN
655	!$acc update host( u, v )
656	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
657	IF ( disturbance_energy_limit /= 0.0_wp .AND. &
658	hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
659	CALL disturb_field( nzb_u_inner, tend, u )
660	CALL disturb_field( nzb_v_inner, tend, v )
661	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
662	!
663	!-- Runs with a non-cyclic lateral wall need perturbations
664	!-- near the inflow throughout the whole simulation
665	dist_range = 1
666	CALL disturb_field( nzb_u_inner, tend, u )
667	CALL disturb_field( nzb_v_inner, tend, v )
668	dist_range = 0
669	ENDIF
670	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
671	!$acc update device( u, v )
672	time_disturb = time_disturb - dt_disturb
673	ENDIF
674	ENDIF
675
676	!
677	!-- Reduce the velocity divergence via the equation for perturbation
678	!-- pressure.
679	IF ( intermediate_timestep_count == 1 .OR. &
680	call_psolver_at_all_substeps ) THEN
681	CALL pres
682	ENDIF
683
684	!
685	!-- If required, compute liquid water content
686	IF ( cloud_physics ) THEN
687	CALL calc_liquid_water_content
688	!$acc update device( ql )
689	ENDIF
690	!
691	!-- If required, compute virtual potential temperature
692	IF ( humidity ) THEN
693	CALL compute_vpt
694	!$acc update device( vpt )
695	ENDIF
696
697	!
698	!-- Compute the diffusion quantities
699	IF ( .NOT. constant_diffusion ) THEN
700
701	!
702	!-- Determine surface fluxes shf and qsws and surface values
703	!-- pt_surface and q_surface in dependence on data from external
704	!-- file LSF_DATA respectively
705	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
706	intermediate_timestep_count == intermediate_timestep_count_max )&
707	THEN
708	CALL ls_forcing_surf ( simulated_time )
709	ENDIF
710
711	!
712	!-- First the vertical fluxes in the surface (constant flux) layer are computed
713	IF ( constant_flux_layer ) THEN
714	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
715	CALL surface_layer_fluxes
716	CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
717	ENDIF
718
719	!
720	!-- If required, solve the energy balance for the surface and run soil
721	!-- model
722	IF ( land_surface .AND. simulated_time > skip_time_do_lsm) THEN
723
724	CALL cpu_log( log_point(54), 'land_surface', 'start' )
725	CALL lsm_energy_balance
726	CALL lsm_soil_model
727	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
728	ENDIF
729	!
730	!-- Compute the diffusion coefficients
731	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
732	IF ( .NOT. humidity ) THEN
733	IF ( ocean ) THEN
734	CALL diffusivities( prho, prho_reference )
735	ELSE
736	CALL diffusivities( pt, pt_reference )
737	ENDIF
738	ELSE
739	CALL diffusivities( vpt, pt_reference )
740	ENDIF
741	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
742
743	ENDIF
744
745	!
746	!-- If required, calculate radiative fluxes and heating rates
747	IF ( radiation .AND. intermediate_timestep_count &
748	== intermediate_timestep_count_max .AND. simulated_time > &
749	skip_time_do_radiation ) THEN
750
751	time_radiation = time_radiation + dt_3d
752
753	IF ( time_radiation >= dt_radiation .OR. force_radiation_call ) &
754	THEN
755
756	CALL cpu_log( log_point(50), 'radiation', 'start' )
757
758	IF ( .NOT. force_radiation_call ) THEN
759	time_radiation = time_radiation - dt_radiation
760	ELSE
761	WRITE(9,*) "Unscheduled radiation call at ", simulated_time
762	CALL LOCAL_FLUSH ( 9 )
763	ENDIF
764
765	IF ( radiation_scheme == 'clear-sky' ) THEN
766	CALL radiation_clearsky
767	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
768	CALL radiation_rrtmg
769	ENDIF
770
771	CALL cpu_log( log_point(50), 'radiation', 'stop' )
772	ENDIF
773	ENDIF
774
775	ENDDO ! Intermediate step loop
776
777	!
778	!-- Increase simulation time and output times
779	nr_timesteps_this_run = nr_timesteps_this_run + 1
780	current_timestep_number = current_timestep_number + 1
781	simulated_time = simulated_time + dt_3d
782	simulated_time_chr = time_to_string( simulated_time )
783	time_since_reference_point = simulated_time - coupling_start_time
784
785	IF ( simulated_time >= skip_time_data_output_av ) THEN
786	time_do_av = time_do_av + dt_3d
787	ENDIF
788	IF ( simulated_time >= skip_time_do2d_xy ) THEN
789	time_do2d_xy = time_do2d_xy + dt_3d
790	ENDIF
791	IF ( simulated_time >= skip_time_do2d_xz ) THEN
792	time_do2d_xz = time_do2d_xz + dt_3d
793	ENDIF
794	IF ( simulated_time >= skip_time_do2d_yz ) THEN
795	time_do2d_yz = time_do2d_yz + dt_3d
796	ENDIF
797	IF ( simulated_time >= skip_time_do3d ) THEN
798	time_do3d = time_do3d + dt_3d
799	ENDIF
800	DO mid = 1, masks
801	IF ( simulated_time >= skip_time_domask(mid) ) THEN
802	time_domask(mid)= time_domask(mid) + dt_3d
803	ENDIF
804	ENDDO
805	time_dvrp = time_dvrp + dt_3d
806	IF ( simulated_time >= skip_time_dosp ) THEN
807	time_dosp = time_dosp + dt_3d
808	ENDIF
809	time_dots = time_dots + dt_3d
810	IF ( .NOT. first_call_lpm ) THEN
811	time_dopts = time_dopts + dt_3d
812	ENDIF
813	IF ( simulated_time >= skip_time_dopr ) THEN
814	time_dopr = time_dopr + dt_3d
815	ENDIF
816	time_dopr_listing = time_dopr_listing + dt_3d
817	time_run_control = time_run_control + dt_3d
818
819	!
820	!-- Data exchange between coupled models
821	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
822	time_coupling = time_coupling + dt_3d
823
824	!
825	!-- In case of model termination initiated by the local model
826	!-- (terminate_coupled > 0), the coupler must be skipped because it would
827	!-- cause an MPI intercomminucation hang.
828	!-- If necessary, the coupler will be called at the beginning of the
829	!-- next restart run.
830	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
831	CALL surface_coupler
832	time_coupling = time_coupling - dt_coupling
833	ENDDO
834	ENDIF
835
836	!
837	!-- Execute user-defined actions
838	CALL user_actions( 'after_integration' )
839
840	!
841	!-- If Galilei transformation is used, determine the distance that the
842	!-- model has moved so far
843	IF ( galilei_transformation ) THEN
844	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
845	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
846	ENDIF
847
848	!
849	!-- Check, if restart is necessary (because cpu-time is expiring or
850	!-- because it is forced by user) and set stop flag
851	!-- This call is skipped if the remote model has already initiated a restart.
852	IF ( .NOT. terminate_run ) CALL check_for_restart
853
854	!
855	!-- Carry out statistical analysis and output at the requested output times.
856	!-- The MOD function is used for calculating the output time counters (like
857	!-- time_dopr) in order to regard a possible decrease of the output time
858	!-- interval in case of restart runs
859
860	!
861	!-- Set a flag indicating that so far no statistics have been created
862	!-- for this time step
863	flow_statistics_called = .FALSE.
864
865	!
866	!-- If required, call flow_statistics for averaging in time
867	IF ( averaging_interval_pr /= 0.0_wp .AND. &
868	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
869	simulated_time >= skip_time_dopr ) THEN
870	time_dopr_av = time_dopr_av + dt_3d
871	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
872	do_sum = .TRUE.
873	time_dopr_av = MOD( time_dopr_av, &
874	MAX( dt_averaging_input_pr, dt_3d ) )
875	ENDIF
876	ENDIF
877	IF ( do_sum ) CALL flow_statistics
878
879	!
880	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
881	IF ( averaging_interval /= 0.0_wp .AND. &
882	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
883	simulated_time >= skip_time_data_output_av ) &
884	THEN
885	time_do_sla = time_do_sla + dt_3d
886	IF ( time_do_sla >= dt_averaging_input ) THEN
887	CALL sum_up_3d_data
888	average_count_3d = average_count_3d + 1
889	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
890	ENDIF
891	ENDIF
892
893	!
894	!-- Calculate spectra for time averaging
895	IF ( averaging_interval_sp /= 0.0_wp .AND. &
896	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
897	simulated_time >= skip_time_dosp ) THEN
898	time_dosp_av = time_dosp_av + dt_3d
899	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
900	CALL calc_spectra
901	time_dosp_av = MOD( time_dosp_av, &
902	MAX( dt_averaging_input_pr, dt_3d ) )
903	ENDIF
904	ENDIF
905
906	!
907	!-- Computation and output of run control parameters.
908	!-- This is also done whenever perturbations have been imposed
909	IF ( time_run_control >= dt_run_control .OR. &
910	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
911	THEN
912	CALL run_control
913	IF ( time_run_control >= dt_run_control ) THEN
914	time_run_control = MOD( time_run_control, &
915	MAX( dt_run_control, dt_3d ) )
916	ENDIF
917	ENDIF
918
919	!
920	!-- Profile output (ASCII) on file
921	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
922	CALL print_1d
923	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
924	dt_3d ) )
925	ENDIF
926
927	!
928	!-- Graphic output for PROFIL
929	IF ( time_dopr >= dt_dopr ) THEN
930	IF ( dopr_n /= 0 ) CALL data_output_profiles
931	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
932	time_dopr_av = 0.0_wp ! due to averaging (see above)
933	ENDIF
934
935	!
936	!-- Graphic output for time series
937	IF ( time_dots >= dt_dots ) THEN
938	CALL data_output_tseries
939	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
940	ENDIF
941
942	!
943	!-- Output of spectra (formatted for use with PROFIL), in case of no
944	!-- time averaging, spectra has to be calculated before
945	IF ( time_dosp >= dt_dosp ) THEN
946	IF ( average_count_sp == 0 ) CALL calc_spectra
947	CALL data_output_spectra
948	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
949	ENDIF
950
951	!
952	!-- 2d-data output (cross-sections)
953	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
954	CALL data_output_2d( 'xy', 0 )
955	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
956	ENDIF
957	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
958	CALL data_output_2d( 'xz', 0 )
959	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
960	ENDIF
961	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
962	CALL data_output_2d( 'yz', 0 )
963	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
964	ENDIF
965
966	!
967	!-- 3d-data output (volume data)
968	IF ( time_do3d >= dt_do3d ) THEN
969	CALL data_output_3d( 0 )
970	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
971	ENDIF
972
973	!
974	!-- masked data output
975	!-- Parallel netcdf output is not tested so far for masked data, hence
976	!-- netcdf_data_format is switched back to non-paralell output.
977	netcdf_data_format_save = netcdf_data_format
978	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
979	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
980	DO mid = 1, masks
981	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
982	CALL data_output_mask( 0 )
983	time_domask(mid) = MOD( time_domask(mid), &
984	MAX( dt_domask(mid), dt_3d ) )
985	ENDIF
986	ENDDO
987	netcdf_data_format = netcdf_data_format_save
988
989	!
990	!-- Output of time-averaged 2d/3d/masked data
991	IF ( time_do_av >= dt_data_output_av ) THEN
992	CALL average_3d_data
993	CALL data_output_2d( 'xy', 1 )
994	CALL data_output_2d( 'xz', 1 )
995	CALL data_output_2d( 'yz', 1 )
996	CALL data_output_3d( 1 )
997	!-- Parallel netcdf output is not tested so far for masked data, hence
998	!-- netcdf_data_format is switched back to non-paralell output.
999	netcdf_data_format_save = netcdf_data_format
1000	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1001	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1002	DO mid = 1, masks
1003	CALL data_output_mask( 1 )
1004	ENDDO
1005	netcdf_data_format = netcdf_data_format_save
1006	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1007	ENDIF
1008
1009	!
1010	!-- Output of particle time series
1011	IF ( particle_advection ) THEN
1012	IF ( time_dopts >= dt_dopts .OR. &
1013	( simulated_time >= particle_advection_start .AND. &
1014	first_call_lpm ) ) THEN
1015	CALL data_output_ptseries
1016	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1017	ENDIF
1018	ENDIF
1019
1020	!
1021	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1022	#if defined( __dvrp_graphics )
1023	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1024	#endif
1025	IF ( time_dvrp >= dt_dvrp ) THEN
1026	CALL data_output_dvrp
1027	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1028	ENDIF
1029	#if defined( __dvrp_graphics )
1030	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1031	#endif
1032
1033	!
1034	!-- If required, set the heat flux for the next time step at a random value
1035	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1036
1037	!
1038	!-- Execute user-defined actions
1039	CALL user_actions( 'after_timestep' )
1040
1041	!
1042	!-- Output elapsed simulated time in form of a progress bar on stdout
1043	IF ( myid == 0 ) CALL output_progress_bar
1044
1045	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1046
1047
1048	ENDDO ! time loop
1049
1050	IF ( myid == 0 ) CALL finish_progress_bar
1051
1052	#if defined( __dvrp_graphics )
1053	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1054	#endif
1055
1056	CALL location_message( 'finished time-stepping', .TRUE. )
1057
1058	END SUBROUTINE time_integration

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