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source: palm/trunk/SOURCE/time_integration.f90 @ 1671

Last change on this file since 1671 was 1671, checked in by raasch, 9 years ago
bugfix: ghostpoint exchange for array diss in case that sgs velocities are used for particles
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1	SUBROUTINE time_integration
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
23	! for particles
24	!
25	! Former revisions:
26	! -----------------
27	! $Id: time_integration.f90 1671 2015-09-25 03:29:37Z raasch $
28	!
29	! 1585 2015-04-30 07:05:52Z maronga
30	! Moved call of radiation scheme. Added support for RRTM
31	!
32	! 1551 2015-03-03 14:18:16Z maronga
33	! Added interface for different radiation schemes.
34	!
35	! 1496 2014-12-02 17:25:50Z maronga
36	! Added calls for the land surface model and radiation scheme
37	!
38	! 1402 2014-05-09 14:25:13Z raasch
39	! location messages modified
40	!
41	! 1384 2014-05-02 14:31:06Z raasch
42	! location messages added
43	!
44	! 1380 2014-04-28 12:40:45Z heinze
45	! CALL of nudge_ref added
46	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
47	!
48	! 1365 2014-04-22 15:03:56Z boeske
49	! Reset sums_ls_l to zero at each timestep
50	! +sums_ls_l
51	! Calculation of reference state (previously in subroutine calc_mean_profile)
52
53	! 1342 2014-03-26 17:04:47Z kanani
54	! REAL constants defined as wp-kind
55	!
56	! 1320 2014-03-20 08:40:49Z raasch
57	! ONLY-attribute added to USE-statements,
58	! kind-parameters added to all INTEGER and REAL declaration statements,
59	! kinds are defined in new module kinds,
60	! old module precision_kind is removed,
61	! revision history before 2012 removed,
62	! comment fields (!:) to be used for variable explanations added to
63	! all variable declaration statements
64	! 1318 2014-03-17 13:35:16Z raasch
65	! module interfaces removed
66	!
67	! 1308 2014-03-13 14:58:42Z fricke
68	! +netcdf_data_format_save
69	! For masked data, parallel netcdf output is not tested so far, hence
70	! netcdf_data_format is switched back to non-paralell output.
71	!
72	! 1276 2014-01-15 13:40:41Z heinze
73	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
74	!
75	! 1257 2013-11-08 15:18:40Z raasch
76	! acc-update-host directive for timestep removed
77	!
78	! 1241 2013-10-30 11:36:58Z heinze
79	! Generalize calc_mean_profile for wider use
80	! Determine shf and qsws in dependence on data from LSF_DATA
81	! Determine ug and vg in dependence on data from LSF_DATA
82	! 1221 2013-09-10 08:59:13Z raasch
83	! host update of arrays before timestep is called
84	!
85	! 1179 2013-06-14 05:57:58Z raasch
86	! mean profiles for reference state are only calculated if required,
87	! small bugfix for background communication
88	!
89	! 1171 2013-05-30 11:27:45Z raasch
90	! split of prognostic_equations deactivated (comment lines), for the time being
91	!
92	! 1128 2013-04-12 06:19:32Z raasch
93	! asynchronous transfer of ghost point data realized for acc-optimized version:
94	! prognostic_equations are first called two times for those points required for
95	! the left-right and north-south exchange, respectively, and then for the
96	! remaining points,
97	! those parts requiring global communication moved from prognostic_equations to
98	! here
99	!
100	! 1115 2013-03-26 18:16:16Z hoffmann
101	! calculation of qr and nr is restricted to precipitation
102	!
103	! 1113 2013-03-10 02:48:14Z raasch
104	! GPU-porting of boundary conditions,
105	! openACC directives updated
106	! formal parameter removed from routine boundary_conds
107	!
108	! 1111 2013-03-08 23:54:10Z raasch
109	! +internal timestep counter for cpu statistics added,
110	! openACC directives updated
111	!
112	! 1092 2013-02-02 11:24:22Z raasch
113	! unused variables removed
114	!
115	! 1065 2012-11-22 17:42:36Z hoffmann
116	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
117	!
118	! 1053 2012-11-13 17:11:03Z hoffmann
119	! exchange of ghost points for nr, qr added
120	!
121	! 1036 2012-10-22 13:43:42Z raasch
122	! code put under GPL (PALM 3.9)
123	!
124	! 1019 2012-09-28 06:46:45Z raasch
125	! non-optimized version of prognostic_equations removed
126	!
127	! 1015 2012-09-27 09:23:24Z raasch
128	! +call of prognostic_equations_acc
129	!
130	! 1001 2012-09-13 14:08:46Z raasch
131	! all actions concerning leapfrog- and upstream-spline-scheme removed
132	!
133	! 849 2012-03-15 10:35:09Z raasch
134	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
135	!
136	! 825 2012-02-19 03:03:44Z raasch
137	! wang_collision_kernel renamed wang_kernel
138	!
139	! Revision 1.1 1997/08/11 06:19:04 raasch
140	! Initial revision
141	!
142	!
143	! Description:
144	! ------------
145	! Integration in time of the model equations, statistical analysis and graphic
146	! output
147	!------------------------------------------------------------------------------!
148
149	USE advec_ws, &
150	ONLY: ws_statistics
151
152	USE arrays_3d, &
153	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
154	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
155	u_p, v, vpt, v_p, w_p
156
157	USE calc_mean_profile_mod, &
158	ONLY: calc_mean_profile
159
160	USE control_parameters, &
161	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
162	average_count_sp, averaging_interval, averaging_interval_pr, &
163	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
164	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
165	cloud_physics, constant_heatflux, create_disturbances, dopr_n, &
166	constant_diffusion, coupling_mode, coupling_start_time, &
167	current_timestep_number, disturbance_created, &
168	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
169	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
170	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
171	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
172	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
173	end_time, first_call_lpm, galilei_transformation, humidity, &
174	icloud_scheme, intermediate_timestep_count, &
175	intermediate_timestep_count_max, large_scale_forcing, &
176	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
177	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
178	ocean, on_device, passive_scalar, prandtl_layer, precipitation, &
179	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
180	run_coupled, simulated_time, simulated_time_chr, &
181	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
182	skip_time_do3d, skip_time_domask, skip_time_dopr, &
183	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
184	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
185	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
186	time_do3d, time_domask, time_dopr, time_dopr_av, &
187	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
188	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
189	time_run_control, time_since_reference_point, &
190	turbulence, &
191	turbulent_inflow, use_initial_profile_as_reference, &
192	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
193	ws_scheme_sca
194
195	USE cpulog, &
196	ONLY: cpu_log, log_point, log_point_s
197
198	USE indices, &
199	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
200	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
201
202	USE interaction_droplets_ptq_mod, &
203	ONLY: interaction_droplets_ptq
204
205	USE kinds
206
207	USE land_surface_model_mod, &
208	ONLY: land_surface, lsm_energy_balance, lsm_soil_model
209
210	USE ls_forcing_mod, &
211	ONLY: ls_forcing_surf, ls_forcing_vert
212
213	USE nudge_mod, &
214	ONLY: calc_tnudge, nudge_ref
215
216	USE particle_attributes, &
217	ONLY: particle_advection, particle_advection_start, &
218	use_sgs_for_particles, wang_kernel
219
220	USE pegrid
221
222	USE production_e_mod, &
223	ONLY: production_e_init
224
225	USE progress_bar, &
226	ONLY: finish_progress_bar, output_progress_bar
227
228	USE prognostic_equations_mod, &
229	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
230	prognostic_equations_vector
231
232	USE radiation_model_mod, &
233	ONLY: dt_radiation, radiation, radiation_clearsky, &
234	radiation_rrtmg, radiation_scheme, time_radiation
235
236	USE statistics, &
237	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
238
239	USE user_actions_mod, &
240	ONLY: user_actions
241
242	IMPLICIT NONE
243
244	CHARACTER (LEN=9) :: time_to_string !:
245
246	INTEGER(iwp) :: netcdf_data_format_save !:
247
248	!
249	!-- At the beginning of a simulation determine the time step as well as
250	!-- determine and print out the run control parameters
251	IF ( simulated_time == 0.0_wp ) CALL timestep
252
253	CALL run_control
254
255
256	!
257	!-- Data exchange between coupled models in case that a call has been omitted
258	!-- at the end of the previous run of a job chain.
259	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
260	!
261	!-- In case of model termination initiated by the local model the coupler
262	!-- must not be called because this would again cause an MPI hang.
263	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
264	CALL surface_coupler
265	time_coupling = time_coupling - dt_coupling
266	ENDDO
267	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
268	THEN
269	time_coupling = time_since_reference_point
270	ENDIF
271	ENDIF
272
273
274	#if defined( __dvrp_graphics )
275	!
276	!-- Time measurement with dvrp software
277	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
278	#endif
279
280	CALL location_message( 'start with time-stepping', .TRUE. )
281	!
282	!-- Start of the time loop
283	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
284	.NOT. terminate_run )
285
286	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
287
288	!
289	!-- Determine size of next time step
290	IF ( simulated_time /= 0.0_wp ) THEN
291	CALL timestep
292	ENDIF
293
294	!
295	!-- Determine ug, vg and w_subs in dependence on data from external file
296	!-- LSF_DATA
297	IF ( large_scale_forcing .AND. lsf_vert ) THEN
298	CALL ls_forcing_vert ( simulated_time )
299	sums_ls_l = 0.0_wp
300	ENDIF
301
302	!
303	!-- Set pt_init and q_init to the current profiles taken from
304	!-- NUDGING_DATA
305	IF ( nudging ) THEN
306	CALL nudge_ref ( simulated_time )
307	!
308	!-- Store temperature gradient at the top boundary for possible Neumann
309	!-- boundary condition
310	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
311	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
312	ENDIF
313
314	!
315	!-- Execute the user-defined actions
316	CALL user_actions( 'before_timestep' )
317
318	!
319	!-- Start of intermediate step loop
320	intermediate_timestep_count = 0
321	DO WHILE ( intermediate_timestep_count < &
322	intermediate_timestep_count_max )
323
324	intermediate_timestep_count = intermediate_timestep_count + 1
325
326	!
327	!-- Set the steering factors for the prognostic equations which depend
328	!-- on the timestep scheme
329	CALL timestep_scheme_steering
330
331	!
332	!-- Calculate those variables needed in the tendency terms which need
333	!-- global communication
334	IF ( .NOT. use_single_reference_value .AND. &
335	.NOT. use_initial_profile_as_reference ) THEN
336	!
337	!-- Horizontally averaged profiles to be used as reference state in
338	!-- buoyancy terms (WARNING: only the respective last call of
339	!-- calc_mean_profile defines the reference state!)
340	IF ( .NOT. neutral ) THEN
341	CALL calc_mean_profile( pt, 4 )
342	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
343	ENDIF
344	IF ( ocean ) THEN
345	CALL calc_mean_profile( rho, 64 )
346	ref_state(:) = hom(:,1,64,0)
347	ENDIF
348	IF ( humidity ) THEN
349	CALL calc_mean_profile( vpt, 44 )
350	ref_state(:) = hom(:,1,44,0)
351	ENDIF
352
353	ENDIF
354
355	IF ( .NOT. constant_diffusion ) CALL production_e_init
356	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
357	intermediate_timestep_count == 1 ) CALL ws_statistics
358	!
359	!-- In case of nudging calculate current nudging time scale and horizontal
360	!-- means of u, v, pt and q
361	IF ( nudging ) THEN
362	CALL calc_tnudge( simulated_time )
363	CALL calc_mean_profile( u, 1 )
364	CALL calc_mean_profile( v, 2 )
365	CALL calc_mean_profile( pt, 4 )
366	CALL calc_mean_profile( q, 41 )
367	ENDIF
368
369	IF ( radiation .AND. intermediate_timestep_count &
370	== intermediate_timestep_count_max ) THEN
371
372	time_radiation = time_radiation + dt_3d
373
374	IF ( time_radiation >= dt_radiation ) THEN
375
376	CALL cpu_log( log_point(50), 'radiation', 'start' )
377
378	time_radiation = time_radiation - dt_radiation
379	IF ( radiation_scheme == 'clear-sky' ) THEN
380	CALL radiation_clearsky
381	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
382	CALL radiation_rrtmg
383	ENDIF
384
385	CALL cpu_log( log_point(50), 'radiation', 'stop' )
386	ENDIF
387	ENDIF
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	!-- When using the land surface model:
629	!-- 1) solve energy balance equation to calculate new skin temperature
630	!-- 2) run soil model
631	IF ( land_surface ) THEN
632
633	CALL cpu_log( log_point(54), 'land_surface', 'start' )
634
635	CALL lsm_energy_balance
636	CALL lsm_soil_model
637
638	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
639
640	ENDIF
641
642	!
643	!-- Swap the time levels in preparation for the next time step.
644	CALL swap_timelevel
645
646	!
647	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
648	!-- when a sloping surface is used
649	IF ( sloping_surface ) THEN
650	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
651	pt_slope_offset
652	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
653	pt_slope_offset
654	ENDIF
655
656	!
657	!-- Impose a turbulent inflow using the recycling method
658	IF ( turbulent_inflow ) CALL inflow_turbulence
659
660	!
661	!-- Impose a random perturbation on the horizontal velocity field
662	IF ( create_disturbances .AND. &
663	( call_psolver_at_all_substeps .AND. &
664	intermediate_timestep_count == intermediate_timestep_count_max )&
665	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
666	intermediate_timestep_count == 1 ) ) &
667	THEN
668	time_disturb = time_disturb + dt_3d
669	IF ( time_disturb >= dt_disturb ) THEN
670	!$acc update host( u, v )
671	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
672	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
673	CALL disturb_field( nzb_u_inner, tend, u )
674	CALL disturb_field( nzb_v_inner, tend, v )
675	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
676	!
677	!-- Runs with a non-cyclic lateral wall need perturbations
678	!-- near the inflow throughout the whole simulation
679	dist_range = 1
680	CALL disturb_field( nzb_u_inner, tend, u )
681	CALL disturb_field( nzb_v_inner, tend, v )
682	dist_range = 0
683	ENDIF
684	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
685	!$acc update device( u, v )
686	time_disturb = time_disturb - dt_disturb
687	ENDIF
688	ENDIF
689
690	!
691	!-- Reduce the velocity divergence via the equation for perturbation
692	!-- pressure.
693	IF ( intermediate_timestep_count == 1 .OR. &
694	call_psolver_at_all_substeps ) THEN
695	CALL pres
696	ENDIF
697
698	!
699	!-- If required, compute liquid water content
700	IF ( cloud_physics ) THEN
701	CALL calc_liquid_water_content
702	!$acc update device( ql )
703	ENDIF
704	!
705	!-- If required, compute virtual potential temperature
706	IF ( humidity ) THEN
707	CALL compute_vpt
708	!$acc update device( vpt )
709	ENDIF
710
711	!
712	!-- Compute the diffusion quantities
713	IF ( .NOT. constant_diffusion ) THEN
714
715	!
716	!-- Determine surface fluxes shf and qsws and surface values
717	!-- pt_surface and q_surface in dependence on data from external
718	!-- file LSF_DATA respectively
719	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
720	intermediate_timestep_count == intermediate_timestep_count_max )&
721	THEN
722	CALL ls_forcing_surf ( simulated_time )
723	ENDIF
724
725	!
726	!-- First the vertical fluxes in the Prandtl layer are being computed
727	IF ( prandtl_layer ) THEN
728	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
729	CALL prandtl_fluxes
730	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
731	ENDIF
732
733	!
734	!-- Compute the diffusion coefficients
735	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
736	IF ( .NOT. humidity ) THEN
737	IF ( ocean ) THEN
738	CALL diffusivities( prho, prho_reference )
739	ELSE
740	CALL diffusivities( pt, pt_reference )
741	ENDIF
742	ELSE
743	CALL diffusivities( vpt, pt_reference )
744	ENDIF
745	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
746
747	ENDIF
748
749	ENDDO ! Intermediate step loop
750
751	!
752	!-- Increase simulation time and output times
753	nr_timesteps_this_run = nr_timesteps_this_run + 1
754	current_timestep_number = current_timestep_number + 1
755	simulated_time = simulated_time + dt_3d
756	simulated_time_chr = time_to_string( simulated_time )
757	time_since_reference_point = simulated_time - coupling_start_time
758
759	IF ( simulated_time >= skip_time_data_output_av ) THEN
760	time_do_av = time_do_av + dt_3d
761	ENDIF
762	IF ( simulated_time >= skip_time_do2d_xy ) THEN
763	time_do2d_xy = time_do2d_xy + dt_3d
764	ENDIF
765	IF ( simulated_time >= skip_time_do2d_xz ) THEN
766	time_do2d_xz = time_do2d_xz + dt_3d
767	ENDIF
768	IF ( simulated_time >= skip_time_do2d_yz ) THEN
769	time_do2d_yz = time_do2d_yz + dt_3d
770	ENDIF
771	IF ( simulated_time >= skip_time_do3d ) THEN
772	time_do3d = time_do3d + dt_3d
773	ENDIF
774	DO mid = 1, masks
775	IF ( simulated_time >= skip_time_domask(mid) ) THEN
776	time_domask(mid)= time_domask(mid) + dt_3d
777	ENDIF
778	ENDDO
779	time_dvrp = time_dvrp + dt_3d
780	IF ( simulated_time >= skip_time_dosp ) THEN
781	time_dosp = time_dosp + dt_3d
782	ENDIF
783	time_dots = time_dots + dt_3d
784	IF ( .NOT. first_call_lpm ) THEN
785	time_dopts = time_dopts + dt_3d
786	ENDIF
787	IF ( simulated_time >= skip_time_dopr ) THEN
788	time_dopr = time_dopr + dt_3d
789	ENDIF
790	time_dopr_listing = time_dopr_listing + dt_3d
791	time_run_control = time_run_control + dt_3d
792
793	!
794	!-- Data exchange between coupled models
795	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
796	time_coupling = time_coupling + dt_3d
797
798	!
799	!-- In case of model termination initiated by the local model
800	!-- (terminate_coupled > 0), the coupler must be skipped because it would
801	!-- cause an MPI intercomminucation hang.
802	!-- If necessary, the coupler will be called at the beginning of the
803	!-- next restart run.
804	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
805	CALL surface_coupler
806	time_coupling = time_coupling - dt_coupling
807	ENDDO
808	ENDIF
809
810	!
811	!-- Execute user-defined actions
812	CALL user_actions( 'after_integration' )
813
814	!
815	!-- If Galilei transformation is used, determine the distance that the
816	!-- model has moved so far
817	IF ( galilei_transformation ) THEN
818	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
819	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
820	ENDIF
821
822	!
823	!-- Check, if restart is necessary (because cpu-time is expiring or
824	!-- because it is forced by user) and set stop flag
825	!-- This call is skipped if the remote model has already initiated a restart.
826	IF ( .NOT. terminate_run ) CALL check_for_restart
827
828	!
829	!-- Carry out statistical analysis and output at the requested output times.
830	!-- The MOD function is used for calculating the output time counters (like
831	!-- time_dopr) in order to regard a possible decrease of the output time
832	!-- interval in case of restart runs
833
834	!
835	!-- Set a flag indicating that so far no statistics have been created
836	!-- for this time step
837	flow_statistics_called = .FALSE.
838
839	!
840	!-- If required, call flow_statistics for averaging in time
841	IF ( averaging_interval_pr /= 0.0_wp .AND. &
842	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
843	simulated_time >= skip_time_dopr ) THEN
844	time_dopr_av = time_dopr_av + dt_3d
845	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
846	do_sum = .TRUE.
847	time_dopr_av = MOD( time_dopr_av, &
848	MAX( dt_averaging_input_pr, dt_3d ) )
849	ENDIF
850	ENDIF
851	IF ( do_sum ) CALL flow_statistics
852
853	!
854	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
855	IF ( averaging_interval /= 0.0_wp .AND. &
856	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
857	simulated_time >= skip_time_data_output_av ) &
858	THEN
859	time_do_sla = time_do_sla + dt_3d
860	IF ( time_do_sla >= dt_averaging_input ) THEN
861	CALL sum_up_3d_data
862	average_count_3d = average_count_3d + 1
863	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
864	ENDIF
865	ENDIF
866
867	!
868	!-- Calculate spectra for time averaging
869	IF ( averaging_interval_sp /= 0.0_wp .AND. &
870	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
871	simulated_time >= skip_time_dosp ) THEN
872	time_dosp_av = time_dosp_av + dt_3d
873	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
874	CALL calc_spectra
875	time_dosp_av = MOD( time_dosp_av, &
876	MAX( dt_averaging_input_pr, dt_3d ) )
877	ENDIF
878	ENDIF
879
880	!
881	!-- Computation and output of run control parameters.
882	!-- This is also done whenever perturbations have been imposed
883	IF ( time_run_control >= dt_run_control .OR. &
884	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
885	THEN
886	CALL run_control
887	IF ( time_run_control >= dt_run_control ) THEN
888	time_run_control = MOD( time_run_control, &
889	MAX( dt_run_control, dt_3d ) )
890	ENDIF
891	ENDIF
892
893	!
894	!-- Profile output (ASCII) on file
895	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
896	CALL print_1d
897	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
898	dt_3d ) )
899	ENDIF
900
901	!
902	!-- Graphic output for PROFIL
903	IF ( time_dopr >= dt_dopr ) THEN
904	IF ( dopr_n /= 0 ) CALL data_output_profiles
905	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
906	time_dopr_av = 0.0_wp ! due to averaging (see above)
907	ENDIF
908
909	!
910	!-- Graphic output for time series
911	IF ( time_dots >= dt_dots ) THEN
912	CALL data_output_tseries
913	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
914	ENDIF
915
916	!
917	!-- Output of spectra (formatted for use with PROFIL), in case of no
918	!-- time averaging, spectra has to be calculated before
919	IF ( time_dosp >= dt_dosp ) THEN
920	IF ( average_count_sp == 0 ) CALL calc_spectra
921	CALL data_output_spectra
922	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
923	ENDIF
924
925	!
926	!-- 2d-data output (cross-sections)
927	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
928	CALL data_output_2d( 'xy', 0 )
929	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
930	ENDIF
931	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
932	CALL data_output_2d( 'xz', 0 )
933	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
934	ENDIF
935	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
936	CALL data_output_2d( 'yz', 0 )
937	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
938	ENDIF
939
940	!
941	!-- 3d-data output (volume data)
942	IF ( time_do3d >= dt_do3d ) THEN
943	CALL data_output_3d( 0 )
944	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
945	ENDIF
946
947	!
948	!-- masked data output
949	!-- Parallel netcdf output is not tested so far for masked data, hence
950	!-- netcdf_data_format is switched back to non-paralell output.
951	netcdf_data_format_save = netcdf_data_format
952	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
953	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
954	DO mid = 1, masks
955	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
956	CALL data_output_mask( 0 )
957	time_domask(mid) = MOD( time_domask(mid), &
958	MAX( dt_domask(mid), dt_3d ) )
959	ENDIF
960	ENDDO
961	netcdf_data_format = netcdf_data_format_save
962
963	!
964	!-- Output of time-averaged 2d/3d/masked data
965	IF ( time_do_av >= dt_data_output_av ) THEN
966	CALL average_3d_data
967	CALL data_output_2d( 'xy', 1 )
968	CALL data_output_2d( 'xz', 1 )
969	CALL data_output_2d( 'yz', 1 )
970	CALL data_output_3d( 1 )
971	!-- Parallel netcdf output is not tested so far for masked data, hence
972	!-- netcdf_data_format is switched back to non-paralell output.
973	netcdf_data_format_save = netcdf_data_format
974	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
975	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
976	DO mid = 1, masks
977	CALL data_output_mask( 1 )
978	ENDDO
979	netcdf_data_format = netcdf_data_format_save
980	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
981	ENDIF
982
983	!
984	!-- Output of particle time series
985	IF ( particle_advection ) THEN
986	IF ( time_dopts >= dt_dopts .OR. &
987	( simulated_time >= particle_advection_start .AND. &
988	first_call_lpm ) ) THEN
989	CALL data_output_ptseries
990	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
991	ENDIF
992	ENDIF
993
994	!
995	!-- Output of dvrp-graphics (isosurface, particles, slicer)
996	#if defined( __dvrp_graphics )
997	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
998	#endif
999	IF ( time_dvrp >= dt_dvrp ) THEN
1000	CALL data_output_dvrp
1001	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1002	ENDIF
1003	#if defined( __dvrp_graphics )
1004	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1005	#endif
1006
1007	!
1008	!-- If required, set the heat flux for the next time step at a random value
1009	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1010
1011	!
1012	!-- Execute user-defined actions
1013	CALL user_actions( 'after_timestep' )
1014
1015	!
1016	!-- Output elapsed simulated time in form of a progress bar on stdout
1017	IF ( myid == 0 ) CALL output_progress_bar
1018
1019	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1020
1021
1022	ENDDO ! time loop
1023
1024	IF ( myid == 0 ) CALL finish_progress_bar
1025
1026	#if defined( __dvrp_graphics )
1027	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1028	#endif
1029
1030	CALL location_message( 'finished time-stepping', .TRUE. )
1031
1032	END SUBROUTINE time_integration

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