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source: palm/trunk/SOURCE/time_integration.f90 @ 1597

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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	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: time_integration.f90 1586 2015-04-30 07:11:33Z gronemeier $
27	!
28	! 1585 2015-04-30 07:05:52Z maronga
29	! Moved call of radiation scheme. Added support for RRTM
30	!
31	! 1551 2015-03-03 14:18:16Z maronga
32	! Added interface for different radiation schemes.
33	!
34	! 1496 2014-12-02 17:25:50Z maronga
35	! Added calls for the land surface model and radiation scheme
36	!
37	! 1402 2014-05-09 14:25:13Z raasch
38	! location messages modified
39	!
40	! 1384 2014-05-02 14:31:06Z raasch
41	! location messages added
42	!
43	! 1380 2014-04-28 12:40:45Z heinze
44	! CALL of nudge_ref added
45	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
46	!
47	! 1365 2014-04-22 15:03:56Z boeske
48	! Reset sums_ls_l to zero at each timestep
49	! +sums_ls_l
50	! Calculation of reference state (previously in subroutine calc_mean_profile)
51
52	! 1342 2014-03-26 17:04:47Z kanani
53	! REAL constants defined as wp-kind
54	!
55	! 1320 2014-03-20 08:40:49Z raasch
56	! ONLY-attribute added to USE-statements,
57	! kind-parameters added to all INTEGER and REAL declaration statements,
58	! kinds are defined in new module kinds,
59	! old module precision_kind is removed,
60	! revision history before 2012 removed,
61	! comment fields (!:) to be used for variable explanations added to
62	! all variable declaration statements
63	! 1318 2014-03-17 13:35:16Z raasch
64	! module interfaces removed
65	!
66	! 1308 2014-03-13 14:58:42Z fricke
67	! +netcdf_data_format_save
68	! For masked data, parallel netcdf output is not tested so far, hence
69	! netcdf_data_format is switched back to non-paralell output.
70	!
71	! 1276 2014-01-15 13:40:41Z heinze
72	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
73	!
74	! 1257 2013-11-08 15:18:40Z raasch
75	! acc-update-host directive for timestep removed
76	!
77	! 1241 2013-10-30 11:36:58Z heinze
78	! Generalize calc_mean_profile for wider use
79	! Determine shf and qsws in dependence on data from LSF_DATA
80	! Determine ug and vg in dependence on data from LSF_DATA
81	! 1221 2013-09-10 08:59:13Z raasch
82	! host update of arrays before timestep is called
83	!
84	! 1179 2013-06-14 05:57:58Z raasch
85	! mean profiles for reference state are only calculated if required,
86	! small bugfix for background communication
87	!
88	! 1171 2013-05-30 11:27:45Z raasch
89	! split of prognostic_equations deactivated (comment lines), for the time being
90	!
91	! 1128 2013-04-12 06:19:32Z raasch
92	! asynchronous transfer of ghost point data realized for acc-optimized version:
93	! prognostic_equations are first called two times for those points required for
94	! the left-right and north-south exchange, respectively, and then for the
95	! remaining points,
96	! those parts requiring global communication moved from prognostic_equations to
97	! here
98	!
99	! 1115 2013-03-26 18:16:16Z hoffmann
100	! calculation of qr and nr is restricted to precipitation
101	!
102	! 1113 2013-03-10 02:48:14Z raasch
103	! GPU-porting of boundary conditions,
104	! openACC directives updated
105	! formal parameter removed from routine boundary_conds
106	!
107	! 1111 2013-03-08 23:54:10Z raasch
108	! +internal timestep counter for cpu statistics added,
109	! openACC directives updated
110	!
111	! 1092 2013-02-02 11:24:22Z raasch
112	! unused variables removed
113	!
114	! 1065 2012-11-22 17:42:36Z hoffmann
115	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
116	!
117	! 1053 2012-11-13 17:11:03Z hoffmann
118	! exchange of ghost points for nr, qr added
119	!
120	! 1036 2012-10-22 13:43:42Z raasch
121	! code put under GPL (PALM 3.9)
122	!
123	! 1019 2012-09-28 06:46:45Z raasch
124	! non-optimized version of prognostic_equations removed
125	!
126	! 1015 2012-09-27 09:23:24Z raasch
127	! +call of prognostic_equations_acc
128	!
129	! 1001 2012-09-13 14:08:46Z raasch
130	! all actions concerning leapfrog- and upstream-spline-scheme removed
131	!
132	! 849 2012-03-15 10:35:09Z raasch
133	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
134	!
135	! 825 2012-02-19 03:03:44Z raasch
136	! wang_collision_kernel renamed wang_kernel
137	!
138	! Revision 1.1 1997/08/11 06:19:04 raasch
139	! Initial revision
140	!
141	!
142	! Description:
143	! ------------
144	! Integration in time of the model equations, statistical analysis and graphic
145	! output
146	!------------------------------------------------------------------------------!
147
148	USE advec_ws, &
149	ONLY: ws_statistics
150
151	USE arrays_3d, &
152	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
153	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
154	u_p, v, vpt, v_p, w_p
155
156	USE calc_mean_profile_mod, &
157	ONLY: calc_mean_profile
158
159	USE control_parameters, &
160	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
161	average_count_sp, averaging_interval, averaging_interval_pr, &
162	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
163	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
164	cloud_physics, constant_heatflux, create_disturbances, dopr_n, &
165	constant_diffusion, coupling_mode, coupling_start_time, &
166	current_timestep_number, disturbance_created, &
167	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
168	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
169	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
170	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
171	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
172	end_time, first_call_lpm, galilei_transformation, humidity, &
173	icloud_scheme, intermediate_timestep_count, &
174	intermediate_timestep_count_max, large_scale_forcing, &
175	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
176	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
177	ocean, on_device, passive_scalar, prandtl_layer, precipitation, &
178	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
179	run_coupled, simulated_time, simulated_time_chr, &
180	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
181	skip_time_do3d, skip_time_domask, skip_time_dopr, &
182	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
183	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
184	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
185	time_do3d, time_domask, time_dopr, time_dopr_av, &
186	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
187	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
188	time_run_control, time_since_reference_point, &
189	turbulence, &
190	turbulent_inflow, use_initial_profile_as_reference, &
191	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
192	ws_scheme_sca
193
194	USE cpulog, &
195	ONLY: cpu_log, log_point, log_point_s
196
197	USE indices, &
198	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
199	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
200
201	USE interaction_droplets_ptq_mod, &
202	ONLY: interaction_droplets_ptq
203
204	USE kinds
205
206	USE land_surface_model_mod, &
207	ONLY: land_surface, lsm_energy_balance, lsm_soil_model
208
209	USE ls_forcing_mod, &
210	ONLY: ls_forcing_surf, ls_forcing_vert
211
212	USE nudge_mod, &
213	ONLY: calc_tnudge, nudge_ref
214
215	USE particle_attributes, &
216	ONLY: particle_advection, particle_advection_start, wang_kernel
217
218	USE pegrid
219
220	USE production_e_mod, &
221	ONLY: production_e_init
222
223	USE progress_bar, &
224	ONLY: finish_progress_bar, output_progress_bar
225
226	USE prognostic_equations_mod, &
227	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
228	prognostic_equations_vector
229
230	USE radiation_model_mod, &
231	ONLY: dt_radiation, radiation, radiation_clearsky, &
232	radiation_rrtmg, radiation_scheme, time_radiation
233
234	USE statistics, &
235	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
236
237	USE user_actions_mod, &
238	ONLY: user_actions
239
240	IMPLICIT NONE
241
242	CHARACTER (LEN=9) :: time_to_string !:
243
244	INTEGER(iwp) :: netcdf_data_format_save !:
245
246	!
247	!-- At the beginning of a simulation determine the time step as well as
248	!-- determine and print out the run control parameters
249	IF ( simulated_time == 0.0_wp ) CALL timestep
250
251	CALL run_control
252
253
254	!
255	!-- Data exchange between coupled models in case that a call has been omitted
256	!-- at the end of the previous run of a job chain.
257	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
258	!
259	!-- In case of model termination initiated by the local model the coupler
260	!-- must not be called because this would again cause an MPI hang.
261	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
262	CALL surface_coupler
263	time_coupling = time_coupling - dt_coupling
264	ENDDO
265	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
266	THEN
267	time_coupling = time_since_reference_point
268	ENDIF
269	ENDIF
270
271
272	#if defined( __dvrp_graphics )
273	!
274	!-- Time measurement with dvrp software
275	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
276	#endif
277
278	CALL location_message( 'start with time-stepping', .TRUE. )
279	!
280	!-- Start of the time loop
281	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
282	.NOT. terminate_run )
283
284	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
285
286	!
287	!-- Determine size of next time step
288	IF ( simulated_time /= 0.0_wp ) THEN
289	CALL timestep
290	ENDIF
291
292	!
293	!-- Determine ug, vg and w_subs in dependence on data from external file
294	!-- LSF_DATA
295	IF ( large_scale_forcing .AND. lsf_vert ) THEN
296	CALL ls_forcing_vert ( simulated_time )
297	sums_ls_l = 0.0_wp
298	ENDIF
299
300	!
301	!-- Set pt_init and q_init to the current profiles taken from
302	!-- NUDGING_DATA
303	IF ( nudging ) THEN
304	CALL nudge_ref ( simulated_time )
305	!
306	!-- Store temperature gradient at the top boundary for possible Neumann
307	!-- boundary condition
308	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
309	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
310	ENDIF
311
312	!
313	!-- Execute the user-defined actions
314	CALL user_actions( 'before_timestep' )
315
316	!
317	!-- Start of intermediate step loop
318	intermediate_timestep_count = 0
319	DO WHILE ( intermediate_timestep_count < &
320	intermediate_timestep_count_max )
321
322	intermediate_timestep_count = intermediate_timestep_count + 1
323
324	!
325	!-- Set the steering factors for the prognostic equations which depend
326	!-- on the timestep scheme
327	CALL timestep_scheme_steering
328
329	!
330	!-- Calculate those variables needed in the tendency terms which need
331	!-- global communication
332	IF ( .NOT. use_single_reference_value .AND. &
333	.NOT. use_initial_profile_as_reference ) THEN
334	!
335	!-- Horizontally averaged profiles to be used as reference state in
336	!-- buoyancy terms (WARNING: only the respective last call of
337	!-- calc_mean_profile defines the reference state!)
338	IF ( .NOT. neutral ) THEN
339	CALL calc_mean_profile( pt, 4 )
340	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
341	ENDIF
342	IF ( ocean ) THEN
343	CALL calc_mean_profile( rho, 64 )
344	ref_state(:) = hom(:,1,64,0)
345	ENDIF
346	IF ( humidity ) THEN
347	CALL calc_mean_profile( vpt, 44 )
348	ref_state(:) = hom(:,1,44,0)
349	ENDIF
350
351	ENDIF
352
353	IF ( .NOT. constant_diffusion ) CALL production_e_init
354	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
355	intermediate_timestep_count == 1 ) CALL ws_statistics
356	!
357	!-- In case of nudging calculate current nudging time scale and horizontal
358	!-- means of u, v, pt and q
359	IF ( nudging ) THEN
360	CALL calc_tnudge( simulated_time )
361	CALL calc_mean_profile( u, 1 )
362	CALL calc_mean_profile( v, 2 )
363	CALL calc_mean_profile( pt, 4 )
364	CALL calc_mean_profile( q, 41 )
365	ENDIF
366
367	IF ( radiation .AND. intermediate_timestep_count &
368	== intermediate_timestep_count_max ) THEN
369
370	time_radiation = time_radiation + dt_3d
371
372	IF ( time_radiation >= dt_radiation ) THEN
373
374	CALL cpu_log( log_point(50), 'radiation', 'start' )
375
376	time_radiation = time_radiation - dt_radiation
377	IF ( radiation_scheme == 'clear-sky' ) THEN
378	CALL radiation_clearsky
379	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
380	CALL radiation_rrtmg
381	ENDIF
382
383	CALL cpu_log( log_point(50), 'radiation', 'stop' )
384	ENDIF
385	ENDIF
386	!
387	!-- Solve the prognostic equations. A fast cache optimized version with
388	!-- only one single loop is used in case of Piascek-Williams advection
389	!-- scheme. NEC vector machines use a different version, because
390	!-- in the other versions a good vectorization is prohibited due to
391	!-- inlining problems.
392	IF ( loop_optimization == 'cache' ) THEN
393	CALL prognostic_equations_cache
394	ELSEIF ( loop_optimization == 'vector' ) THEN
395	CALL prognostic_equations_vector
396	ELSEIF ( loop_optimization == 'acc' ) THEN
397	i_left = nxl; i_right = nxr
398	j_south = nys; j_north = nyn
399	CALL prognostic_equations_acc
400
401	! i_left = nxl; i_right = nxl+nbgp-1
402	! j_south = nys; j_north = nyn
403	! CALL prognostic_equations_acc
404	! i_left = nxr-nbgp+1; i_right = nxr
405	! j_south = nys; j_north = nyn
406	! CALL prognostic_equations_acc
407
408	!
409	!-- Exchange of ghost points (lateral boundary conditions)
410	IF ( background_communication ) THEN
411
412	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
413
414	send_receive = 'lr'
415	sendrecv_in_background = .TRUE.
416	req = 0
417	req_count = 0
418
419	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
420	on_device = .TRUE. ! to be removed after complete porting
421	ELSE ! of ghost point exchange
422	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
423	ENDIF
424
425	CALL exchange_horiz( u_p, nbgp )
426	CALL exchange_horiz( v_p, nbgp )
427	CALL exchange_horiz( w_p, nbgp )
428	CALL exchange_horiz( pt_p, nbgp )
429	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
430	IF ( ocean ) THEN
431	CALL exchange_horiz( sa_p, nbgp )
432	CALL exchange_horiz( rho, nbgp )
433	CALL exchange_horiz( prho, nbgp )
434	ENDIF
435	IF (humidity .OR. passive_scalar) THEN
436	CALL exchange_horiz( q_p, nbgp )
437	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
438	CALL exchange_horiz( qr_p, nbgp )
439	CALL exchange_horiz( nr_p, nbgp )
440	ENDIF
441	ENDIF
442	IF ( cloud_droplets ) THEN
443	CALL exchange_horiz( ql, nbgp )
444	CALL exchange_horiz( ql_c, nbgp )
445	CALL exchange_horiz( ql_v, nbgp )
446	CALL exchange_horiz( ql_vp, nbgp )
447	ENDIF
448	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
449
450	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
451	on_device = .FALSE. ! to be removed after complete porting
452	ELSE ! of ghost point exchange
453	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
454	ENDIF
455
456	sendrecv_in_background = .FALSE.
457
458	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
459
460	ENDIF
461
462	! i_left = nxl+nbgp; i_right = nxr-nbgp
463	! j_south = nys; j_north = nys+nbgp-1
464	! CALL prognostic_equations_acc
465	! i_left = nxl+nbgp; i_right = nxr-nbgp
466	! j_south = nyn-nbgp+1; j_north = nyn
467	! CALL prognostic_equations_acc
468
469	IF ( background_communication ) THEN
470	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
471	#if defined( __parallel )
472	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
473	#endif
474	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
475
476	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
477
478	send_receive = 'ns'
479	sendrecv_in_background = .TRUE.
480	req = 0
481	req_count = 0
482
483	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
484	on_device = .TRUE. ! to be removed after complete porting
485	ELSE ! of ghost point exchange
486	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
487	ENDIF
488
489	CALL exchange_horiz( u_p, nbgp )
490	CALL exchange_horiz( v_p, nbgp )
491	CALL exchange_horiz( w_p, nbgp )
492	CALL exchange_horiz( pt_p, nbgp )
493	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
494	IF ( ocean ) THEN
495	CALL exchange_horiz( sa_p, nbgp )
496	CALL exchange_horiz( rho, nbgp )
497	CALL exchange_horiz( prho, nbgp )
498	ENDIF
499	IF (humidity .OR. passive_scalar) THEN
500	CALL exchange_horiz( q_p, nbgp )
501	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
502	CALL exchange_horiz( qr_p, nbgp )
503	CALL exchange_horiz( nr_p, nbgp )
504	ENDIF
505	ENDIF
506	IF ( cloud_droplets ) THEN
507	CALL exchange_horiz( ql, nbgp )
508	CALL exchange_horiz( ql_c, nbgp )
509	CALL exchange_horiz( ql_v, nbgp )
510	CALL exchange_horiz( ql_vp, nbgp )
511	ENDIF
512	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
513
514	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
515	on_device = .FALSE. ! to be removed after complete porting
516	ELSE ! of ghost point exchange
517	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
518	ENDIF
519
520	sendrecv_in_background = .FALSE.
521
522	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
523
524	ENDIF
525
526	! i_left = nxl+nbgp; i_right = nxr-nbgp
527	! j_south = nys+nbgp; j_north = nyn-nbgp
528	! CALL prognostic_equations_acc
529
530	IF ( background_communication ) THEN
531	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
532	#if defined( __parallel )
533	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
534	#endif
535	send_receive = 'al'
536	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
537	ENDIF
538
539	ENDIF
540
541	!
542	!-- Particle transport/physics with the Lagrangian particle model
543	!-- (only once during intermediate steps, because it uses an Euler-step)
544	!-- ### particle model should be moved before prognostic_equations, in order
545	!-- to regard droplet interactions directly
546	IF ( particle_advection .AND. &
547	simulated_time >= particle_advection_start .AND. &
548	intermediate_timestep_count == 1 ) THEN
549	CALL lpm
550	first_call_lpm = .FALSE.
551	ENDIF
552
553	!
554	!-- Interaction of droplets with temperature and specific humidity.
555	!-- Droplet condensation and evaporation is calculated within
556	!-- advec_particles.
557	IF ( cloud_droplets .AND. &
558	intermediate_timestep_count == intermediate_timestep_count_max )&
559	THEN
560	CALL interaction_droplets_ptq
561	ENDIF
562
563	!
564	!-- Exchange of ghost points (lateral boundary conditions)
565	IF ( .NOT. background_communication ) THEN
566
567	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
568
569	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
570	on_device = .TRUE. ! to be removed after complete porting
571	ELSE ! of ghost point exchange
572	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
573	ENDIF
574
575	CALL exchange_horiz( u_p, nbgp )
576	CALL exchange_horiz( v_p, nbgp )
577	CALL exchange_horiz( w_p, nbgp )
578	CALL exchange_horiz( pt_p, nbgp )
579	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
580	IF ( ocean ) THEN
581	CALL exchange_horiz( sa_p, nbgp )
582	CALL exchange_horiz( rho, nbgp )
583	CALL exchange_horiz( prho, nbgp )
584	ENDIF
585	IF (humidity .OR. passive_scalar) THEN
586	CALL exchange_horiz( q_p, nbgp )
587	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
588	precipitation ) THEN
589	CALL exchange_horiz( qr_p, nbgp )
590	CALL exchange_horiz( nr_p, nbgp )
591	ENDIF
592	ENDIF
593	IF ( cloud_droplets ) THEN
594	CALL exchange_horiz( ql, nbgp )
595	CALL exchange_horiz( ql_c, nbgp )
596	CALL exchange_horiz( ql_v, nbgp )
597	CALL exchange_horiz( ql_vp, nbgp )
598	ENDIF
599	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
600
601	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
602	on_device = .FALSE. ! to be removed after complete porting
603	ELSE ! of ghost point exchange
604	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
605	ENDIF
606
607	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
608
609	ENDIF
610
611	!
612	!-- Boundary conditions for the prognostic quantities (except of the
613	!-- velocities at the outflow in case of a non-cyclic lateral wall)
614	CALL boundary_conds
615
616	!
617	!-- When using the land surface model:
618	!-- 1) solve energy balance equation to calculate new skin temperature
619	!-- 2) run soil model
620	IF ( land_surface ) THEN
621
622	CALL cpu_log( log_point(54), 'land_surface', 'start' )
623
624	CALL lsm_energy_balance
625	CALL lsm_soil_model
626
627	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
628
629	ENDIF
630
631	!
632	!-- Swap the time levels in preparation for the next time step.
633	CALL swap_timelevel
634
635	!
636	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
637	!-- when a sloping surface is used
638	IF ( sloping_surface ) THEN
639	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
640	pt_slope_offset
641	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
642	pt_slope_offset
643	ENDIF
644
645	!
646	!-- Impose a turbulent inflow using the recycling method
647	IF ( turbulent_inflow ) CALL inflow_turbulence
648
649	!
650	!-- Impose a random perturbation on the horizontal velocity field
651	IF ( create_disturbances .AND. &
652	( call_psolver_at_all_substeps .AND. &
653	intermediate_timestep_count == intermediate_timestep_count_max )&
654	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
655	intermediate_timestep_count == 1 ) ) &
656	THEN
657	time_disturb = time_disturb + dt_3d
658	IF ( time_disturb >= dt_disturb ) THEN
659	!$acc update host( u, v )
660	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
661	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
662	CALL disturb_field( nzb_u_inner, tend, u )
663	CALL disturb_field( nzb_v_inner, tend, v )
664	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
665	!
666	!-- Runs with a non-cyclic lateral wall need perturbations
667	!-- near the inflow throughout the whole simulation
668	dist_range = 1
669	CALL disturb_field( nzb_u_inner, tend, u )
670	CALL disturb_field( nzb_v_inner, tend, v )
671	dist_range = 0
672	ENDIF
673	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
674	!$acc update device( u, v )
675	time_disturb = time_disturb - dt_disturb
676	ENDIF
677	ENDIF
678
679	!
680	!-- Reduce the velocity divergence via the equation for perturbation
681	!-- pressure.
682	IF ( intermediate_timestep_count == 1 .OR. &
683	call_psolver_at_all_substeps ) THEN
684	CALL pres
685	ENDIF
686
687	!
688	!-- If required, compute liquid water content
689	IF ( cloud_physics ) THEN
690	CALL calc_liquid_water_content
691	!$acc update device( ql )
692	ENDIF
693	!
694	!-- If required, compute virtual potential temperature
695	IF ( humidity ) THEN
696	CALL compute_vpt
697	!$acc update device( vpt )
698	ENDIF
699
700	!
701	!-- Compute the diffusion quantities
702	IF ( .NOT. constant_diffusion ) THEN
703
704	!
705	!-- Determine surface fluxes shf and qsws and surface values
706	!-- pt_surface and q_surface in dependence on data from external
707	!-- file LSF_DATA respectively
708	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
709	intermediate_timestep_count == intermediate_timestep_count_max )&
710	THEN
711	CALL ls_forcing_surf ( simulated_time )
712	ENDIF
713
714	!
715	!-- First the vertical fluxes in the Prandtl layer are being computed
716	IF ( prandtl_layer ) THEN
717	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
718	CALL prandtl_fluxes
719	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
720	ENDIF
721
722	!
723	!-- Compute the diffusion coefficients
724	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
725	IF ( .NOT. humidity ) THEN
726	IF ( ocean ) THEN
727	CALL diffusivities( prho, prho_reference )
728	ELSE
729	CALL diffusivities( pt, pt_reference )
730	ENDIF
731	ELSE
732	CALL diffusivities( vpt, pt_reference )
733	ENDIF
734	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
735
736	ENDIF
737
738	ENDDO ! Intermediate step loop
739
740	!
741	!-- Increase simulation time and output times
742	nr_timesteps_this_run = nr_timesteps_this_run + 1
743	current_timestep_number = current_timestep_number + 1
744	simulated_time = simulated_time + dt_3d
745	simulated_time_chr = time_to_string( simulated_time )
746	time_since_reference_point = simulated_time - coupling_start_time
747
748	IF ( simulated_time >= skip_time_data_output_av ) THEN
749	time_do_av = time_do_av + dt_3d
750	ENDIF
751	IF ( simulated_time >= skip_time_do2d_xy ) THEN
752	time_do2d_xy = time_do2d_xy + dt_3d
753	ENDIF
754	IF ( simulated_time >= skip_time_do2d_xz ) THEN
755	time_do2d_xz = time_do2d_xz + dt_3d
756	ENDIF
757	IF ( simulated_time >= skip_time_do2d_yz ) THEN
758	time_do2d_yz = time_do2d_yz + dt_3d
759	ENDIF
760	IF ( simulated_time >= skip_time_do3d ) THEN
761	time_do3d = time_do3d + dt_3d
762	ENDIF
763	DO mid = 1, masks
764	IF ( simulated_time >= skip_time_domask(mid) ) THEN
765	time_domask(mid)= time_domask(mid) + dt_3d
766	ENDIF
767	ENDDO
768	time_dvrp = time_dvrp + dt_3d
769	IF ( simulated_time >= skip_time_dosp ) THEN
770	time_dosp = time_dosp + dt_3d
771	ENDIF
772	time_dots = time_dots + dt_3d
773	IF ( .NOT. first_call_lpm ) THEN
774	time_dopts = time_dopts + dt_3d
775	ENDIF
776	IF ( simulated_time >= skip_time_dopr ) THEN
777	time_dopr = time_dopr + dt_3d
778	ENDIF
779	time_dopr_listing = time_dopr_listing + dt_3d
780	time_run_control = time_run_control + dt_3d
781
782	!
783	!-- Data exchange between coupled models
784	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
785	time_coupling = time_coupling + dt_3d
786
787	!
788	!-- In case of model termination initiated by the local model
789	!-- (terminate_coupled > 0), the coupler must be skipped because it would
790	!-- cause an MPI intercomminucation hang.
791	!-- If necessary, the coupler will be called at the beginning of the
792	!-- next restart run.
793	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
794	CALL surface_coupler
795	time_coupling = time_coupling - dt_coupling
796	ENDDO
797	ENDIF
798
799	!
800	!-- Execute user-defined actions
801	CALL user_actions( 'after_integration' )
802
803	!
804	!-- If Galilei transformation is used, determine the distance that the
805	!-- model has moved so far
806	IF ( galilei_transformation ) THEN
807	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
808	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
809	ENDIF
810
811	!
812	!-- Check, if restart is necessary (because cpu-time is expiring or
813	!-- because it is forced by user) and set stop flag
814	!-- This call is skipped if the remote model has already initiated a restart.
815	IF ( .NOT. terminate_run ) CALL check_for_restart
816
817	!
818	!-- Carry out statistical analysis and output at the requested output times.
819	!-- The MOD function is used for calculating the output time counters (like
820	!-- time_dopr) in order to regard a possible decrease of the output time
821	!-- interval in case of restart runs
822
823	!
824	!-- Set a flag indicating that so far no statistics have been created
825	!-- for this time step
826	flow_statistics_called = .FALSE.
827
828	!
829	!-- If required, call flow_statistics for averaging in time
830	IF ( averaging_interval_pr /= 0.0_wp .AND. &
831	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
832	simulated_time >= skip_time_dopr ) THEN
833	time_dopr_av = time_dopr_av + dt_3d
834	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
835	do_sum = .TRUE.
836	time_dopr_av = MOD( time_dopr_av, &
837	MAX( dt_averaging_input_pr, dt_3d ) )
838	ENDIF
839	ENDIF
840	IF ( do_sum ) CALL flow_statistics
841
842	!
843	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
844	IF ( averaging_interval /= 0.0_wp .AND. &
845	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
846	simulated_time >= skip_time_data_output_av ) &
847	THEN
848	time_do_sla = time_do_sla + dt_3d
849	IF ( time_do_sla >= dt_averaging_input ) THEN
850	CALL sum_up_3d_data
851	average_count_3d = average_count_3d + 1
852	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
853	ENDIF
854	ENDIF
855
856	!
857	!-- Calculate spectra for time averaging
858	IF ( averaging_interval_sp /= 0.0_wp .AND. &
859	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
860	simulated_time >= skip_time_dosp ) THEN
861	time_dosp_av = time_dosp_av + dt_3d
862	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
863	CALL calc_spectra
864	time_dosp_av = MOD( time_dosp_av, &
865	MAX( dt_averaging_input_pr, dt_3d ) )
866	ENDIF
867	ENDIF
868
869	!
870	!-- Computation and output of run control parameters.
871	!-- This is also done whenever perturbations have been imposed
872	IF ( time_run_control >= dt_run_control .OR. &
873	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
874	THEN
875	CALL run_control
876	IF ( time_run_control >= dt_run_control ) THEN
877	time_run_control = MOD( time_run_control, &
878	MAX( dt_run_control, dt_3d ) )
879	ENDIF
880	ENDIF
881
882	!
883	!-- Profile output (ASCII) on file
884	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
885	CALL print_1d
886	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
887	dt_3d ) )
888	ENDIF
889
890	!
891	!-- Graphic output for PROFIL
892	IF ( time_dopr >= dt_dopr ) THEN
893	IF ( dopr_n /= 0 ) CALL data_output_profiles
894	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
895	time_dopr_av = 0.0_wp ! due to averaging (see above)
896	ENDIF
897
898	!
899	!-- Graphic output for time series
900	IF ( time_dots >= dt_dots ) THEN
901	CALL data_output_tseries
902	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
903	ENDIF
904
905	!
906	!-- Output of spectra (formatted for use with PROFIL), in case of no
907	!-- time averaging, spectra has to be calculated before
908	IF ( time_dosp >= dt_dosp ) THEN
909	IF ( average_count_sp == 0 ) CALL calc_spectra
910	CALL data_output_spectra
911	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
912	ENDIF
913
914	!
915	!-- 2d-data output (cross-sections)
916	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
917	CALL data_output_2d( 'xy', 0 )
918	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
919	ENDIF
920	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
921	CALL data_output_2d( 'xz', 0 )
922	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
923	ENDIF
924	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
925	CALL data_output_2d( 'yz', 0 )
926	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
927	ENDIF
928
929	!
930	!-- 3d-data output (volume data)
931	IF ( time_do3d >= dt_do3d ) THEN
932	CALL data_output_3d( 0 )
933	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
934	ENDIF
935
936	!
937	!-- masked data output
938	!-- Parallel netcdf output is not tested so far for masked data, hence
939	!-- netcdf_data_format is switched back to non-paralell output.
940	netcdf_data_format_save = netcdf_data_format
941	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
942	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
943	DO mid = 1, masks
944	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
945	CALL data_output_mask( 0 )
946	time_domask(mid) = MOD( time_domask(mid), &
947	MAX( dt_domask(mid), dt_3d ) )
948	ENDIF
949	ENDDO
950	netcdf_data_format = netcdf_data_format_save
951
952	!
953	!-- Output of time-averaged 2d/3d/masked data
954	IF ( time_do_av >= dt_data_output_av ) THEN
955	CALL average_3d_data
956	CALL data_output_2d( 'xy', 1 )
957	CALL data_output_2d( 'xz', 1 )
958	CALL data_output_2d( 'yz', 1 )
959	CALL data_output_3d( 1 )
960	!-- Parallel netcdf output is not tested so far for masked data, hence
961	!-- netcdf_data_format is switched back to non-paralell output.
962	netcdf_data_format_save = netcdf_data_format
963	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
964	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
965	DO mid = 1, masks
966	CALL data_output_mask( 1 )
967	ENDDO
968	netcdf_data_format = netcdf_data_format_save
969	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
970	ENDIF
971
972	!
973	!-- Output of particle time series
974	IF ( particle_advection ) THEN
975	IF ( time_dopts >= dt_dopts .OR. &
976	( simulated_time >= particle_advection_start .AND. &
977	first_call_lpm ) ) THEN
978	CALL data_output_ptseries
979	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
980	ENDIF
981	ENDIF
982
983	!
984	!-- Output of dvrp-graphics (isosurface, particles, slicer)
985	#if defined( __dvrp_graphics )
986	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
987	#endif
988	IF ( time_dvrp >= dt_dvrp ) THEN
989	CALL data_output_dvrp
990	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
991	ENDIF
992	#if defined( __dvrp_graphics )
993	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
994	#endif
995
996	!
997	!-- If required, set the heat flux for the next time step at a random value
998	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
999
1000	!
1001	!-- Execute user-defined actions
1002	CALL user_actions( 'after_timestep' )
1003
1004	!
1005	!-- Output elapsed simulated time in form of a progress bar on stdout
1006	IF ( myid == 0 ) CALL output_progress_bar
1007
1008	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1009
1010
1011	ENDDO ! time loop
1012
1013	IF ( myid == 0 ) CALL finish_progress_bar
1014
1015	#if defined( __dvrp_graphics )
1016	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1017	#endif
1018
1019	CALL location_message( 'finished time-stepping', .TRUE. )
1020
1021	END SUBROUTINE time_integration

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