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source: palm/trunk/SOURCE/time_integration.f90 @ 1585

Last change on this file since 1585 was 1585, checked in by maronga, 9 years ago
Added support for RRTMG radiation code
Property svn:keywords set to `Id`
File size: 39.5 KB

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

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