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source: palm/trunk/SOURCE/time_integration.f90 @ 1685

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1	!> @file time_integration.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2014 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: time_integration.f90 1683 2015-10-07 23:57:51Z raasch $
26	!
27	! 1682 2015-10-07 23:56:08Z knoop
28	! Code annotations made doxygen readable
29	!
30	! 1671 2015-09-25 03:29:37Z raasch
31	! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
32	! for particles
33	!
34	! 1585 2015-04-30 07:05:52Z maronga
35	! Moved call of radiation scheme. Added support for RRTM
36	!
37	! 1551 2015-03-03 14:18:16Z maronga
38	! Added interface for different radiation schemes.
39	!
40	! 1496 2014-12-02 17:25:50Z maronga
41	! Added calls for the land surface model and radiation scheme
42	!
43	! 1402 2014-05-09 14:25:13Z raasch
44	! location messages modified
45	!
46	! 1384 2014-05-02 14:31:06Z raasch
47	! location messages added
48	!
49	! 1380 2014-04-28 12:40:45Z heinze
50	! CALL of nudge_ref added
51	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
52	!
53	! 1365 2014-04-22 15:03:56Z boeske
54	! Reset sums_ls_l to zero at each timestep
55	! +sums_ls_l
56	! Calculation of reference state (previously in subroutine calc_mean_profile)
57
58	! 1342 2014-03-26 17:04:47Z kanani
59	! REAL constants defined as wp-kind
60	!
61	! 1320 2014-03-20 08:40:49Z raasch
62	! ONLY-attribute added to USE-statements,
63	! kind-parameters added to all INTEGER and REAL declaration statements,
64	! kinds are defined in new module kinds,
65	! old module precision_kind is removed,
66	! revision history before 2012 removed,
67	! comment fields (!:) to be used for variable explanations added to
68	! all variable declaration statements
69	! 1318 2014-03-17 13:35:16Z raasch
70	! module interfaces removed
71	!
72	! 1308 2014-03-13 14:58:42Z fricke
73	! +netcdf_data_format_save
74	! For masked data, parallel netcdf output is not tested so far, hence
75	! netcdf_data_format is switched back to non-paralell output.
76	!
77	! 1276 2014-01-15 13:40:41Z heinze
78	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
79	!
80	! 1257 2013-11-08 15:18:40Z raasch
81	! acc-update-host directive for timestep removed
82	!
83	! 1241 2013-10-30 11:36:58Z heinze
84	! Generalize calc_mean_profile for wider use
85	! Determine shf and qsws in dependence on data from LSF_DATA
86	! Determine ug and vg in dependence on data from LSF_DATA
87	! 1221 2013-09-10 08:59:13Z raasch
88	! host update of arrays before timestep is called
89	!
90	! 1179 2013-06-14 05:57:58Z raasch
91	! mean profiles for reference state are only calculated if required,
92	! small bugfix for background communication
93	!
94	! 1171 2013-05-30 11:27:45Z raasch
95	! split of prognostic_equations deactivated (comment lines), for the time being
96	!
97	! 1128 2013-04-12 06:19:32Z raasch
98	! asynchronous transfer of ghost point data realized for acc-optimized version:
99	! prognostic_equations are first called two times for those points required for
100	! the left-right and north-south exchange, respectively, and then for the
101	! remaining points,
102	! those parts requiring global communication moved from prognostic_equations to
103	! here
104	!
105	! 1115 2013-03-26 18:16:16Z hoffmann
106	! calculation of qr and nr is restricted to precipitation
107	!
108	! 1113 2013-03-10 02:48:14Z raasch
109	! GPU-porting of boundary conditions,
110	! openACC directives updated
111	! formal parameter removed from routine boundary_conds
112	!
113	! 1111 2013-03-08 23:54:10Z raasch
114	! +internal timestep counter for cpu statistics added,
115	! openACC directives updated
116	!
117	! 1092 2013-02-02 11:24:22Z raasch
118	! unused variables removed
119	!
120	! 1065 2012-11-22 17:42:36Z hoffmann
121	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
122	!
123	! 1053 2012-11-13 17:11:03Z hoffmann
124	! exchange of ghost points for nr, qr added
125	!
126	! 1036 2012-10-22 13:43:42Z raasch
127	! code put under GPL (PALM 3.9)
128	!
129	! 1019 2012-09-28 06:46:45Z raasch
130	! non-optimized version of prognostic_equations removed
131	!
132	! 1015 2012-09-27 09:23:24Z raasch
133	! +call of prognostic_equations_acc
134	!
135	! 1001 2012-09-13 14:08:46Z raasch
136	! all actions concerning leapfrog- and upstream-spline-scheme removed
137	!
138	! 849 2012-03-15 10:35:09Z raasch
139	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
140	!
141	! 825 2012-02-19 03:03:44Z raasch
142	! wang_collision_kernel renamed wang_kernel
143	!
144	! Revision 1.1 1997/08/11 06:19:04 raasch
145	! Initial revision
146	!
147	!
148	! Description:
149	! ------------
150	!> Integration in time of the model equations, statistical analysis and graphic
151	!> output
152	!------------------------------------------------------------------------------!
153	SUBROUTINE time_integration
154
155
156	USE advec_ws, &
157	ONLY: ws_statistics
158
159	USE arrays_3d, &
160	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
161	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
162	u_p, v, vpt, v_p, w_p
163
164	USE calc_mean_profile_mod, &
165	ONLY: calc_mean_profile
166
167	USE control_parameters, &
168	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
169	average_count_sp, averaging_interval, averaging_interval_pr, &
170	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
171	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
172	cloud_physics, constant_heatflux, create_disturbances, dopr_n, &
173	constant_diffusion, coupling_mode, coupling_start_time, &
174	current_timestep_number, disturbance_created, &
175	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
176	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
177	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
178	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
179	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
180	end_time, first_call_lpm, galilei_transformation, humidity, &
181	icloud_scheme, intermediate_timestep_count, &
182	intermediate_timestep_count_max, large_scale_forcing, &
183	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
184	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
185	ocean, on_device, passive_scalar, prandtl_layer, precipitation, &
186	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
187	run_coupled, simulated_time, simulated_time_chr, &
188	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
189	skip_time_do3d, skip_time_domask, skip_time_dopr, &
190	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
191	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
192	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
193	time_do3d, time_domask, time_dopr, time_dopr_av, &
194	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
195	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
196	time_run_control, time_since_reference_point, &
197	turbulence, &
198	turbulent_inflow, use_initial_profile_as_reference, &
199	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
200	ws_scheme_sca
201
202	USE cpulog, &
203	ONLY: cpu_log, log_point, log_point_s
204
205	USE indices, &
206	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
207	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
208
209	USE interaction_droplets_ptq_mod, &
210	ONLY: interaction_droplets_ptq
211
212	USE kinds
213
214	USE land_surface_model_mod, &
215	ONLY: land_surface, lsm_energy_balance, lsm_soil_model
216
217	USE ls_forcing_mod, &
218	ONLY: ls_forcing_surf, ls_forcing_vert
219
220	USE nudge_mod, &
221	ONLY: calc_tnudge, nudge_ref
222
223	USE particle_attributes, &
224	ONLY: particle_advection, particle_advection_start, &
225	use_sgs_for_particles, wang_kernel
226
227	USE pegrid
228
229	USE production_e_mod, &
230	ONLY: production_e_init
231
232	USE progress_bar, &
233	ONLY: finish_progress_bar, output_progress_bar
234
235	USE prognostic_equations_mod, &
236	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
237	prognostic_equations_vector
238
239	USE radiation_model_mod, &
240	ONLY: dt_radiation, radiation, radiation_clearsky, &
241	radiation_rrtmg, radiation_scheme, time_radiation
242
243	USE statistics, &
244	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
245
246	USE user_actions_mod, &
247	ONLY: user_actions
248
249	IMPLICIT NONE
250
251	CHARACTER (LEN=9) :: time_to_string !<
252
253	INTEGER(iwp) :: netcdf_data_format_save !<
254
255	!
256	!-- At the beginning of a simulation determine the time step as well as
257	!-- determine and print out the run control parameters
258	IF ( simulated_time == 0.0_wp ) CALL timestep
259
260	CALL run_control
261
262
263	!
264	!-- Data exchange between coupled models in case that a call has been omitted
265	!-- at the end of the previous run of a job chain.
266	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
267	!
268	!-- In case of model termination initiated by the local model the coupler
269	!-- must not be called because this would again cause an MPI hang.
270	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
271	CALL surface_coupler
272	time_coupling = time_coupling - dt_coupling
273	ENDDO
274	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
275	THEN
276	time_coupling = time_since_reference_point
277	ENDIF
278	ENDIF
279
280
281	#if defined( __dvrp_graphics )
282	!
283	!-- Time measurement with dvrp software
284	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
285	#endif
286
287	CALL location_message( 'start with time-stepping', .TRUE. )
288	!
289	!-- Start of the time loop
290	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
291	.NOT. terminate_run )
292
293	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
294
295	!
296	!-- Determine size of next time step
297	IF ( simulated_time /= 0.0_wp ) THEN
298	CALL timestep
299	ENDIF
300
301	!
302	!-- Determine ug, vg and w_subs in dependence on data from external file
303	!-- LSF_DATA
304	IF ( large_scale_forcing .AND. lsf_vert ) THEN
305	CALL ls_forcing_vert ( simulated_time )
306	sums_ls_l = 0.0_wp
307	ENDIF
308
309	!
310	!-- Set pt_init and q_init to the current profiles taken from
311	!-- NUDGING_DATA
312	IF ( nudging ) THEN
313	CALL nudge_ref ( simulated_time )
314	!
315	!-- Store temperature gradient at the top boundary for possible Neumann
316	!-- boundary condition
317	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
318	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
319	ENDIF
320
321	!
322	!-- Execute the user-defined actions
323	CALL user_actions( 'before_timestep' )
324
325	!
326	!-- Start of intermediate step loop
327	intermediate_timestep_count = 0
328	DO WHILE ( intermediate_timestep_count < &
329	intermediate_timestep_count_max )
330
331	intermediate_timestep_count = intermediate_timestep_count + 1
332
333	!
334	!-- Set the steering factors for the prognostic equations which depend
335	!-- on the timestep scheme
336	CALL timestep_scheme_steering
337
338	!
339	!-- Calculate those variables needed in the tendency terms which need
340	!-- global communication
341	IF ( .NOT. use_single_reference_value .AND. &
342	.NOT. use_initial_profile_as_reference ) THEN
343	!
344	!-- Horizontally averaged profiles to be used as reference state in
345	!-- buoyancy terms (WARNING: only the respective last call of
346	!-- calc_mean_profile defines the reference state!)
347	IF ( .NOT. neutral ) THEN
348	CALL calc_mean_profile( pt, 4 )
349	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
350	ENDIF
351	IF ( ocean ) THEN
352	CALL calc_mean_profile( rho, 64 )
353	ref_state(:) = hom(:,1,64,0)
354	ENDIF
355	IF ( humidity ) THEN
356	CALL calc_mean_profile( vpt, 44 )
357	ref_state(:) = hom(:,1,44,0)
358	ENDIF
359
360	ENDIF
361
362	IF ( .NOT. constant_diffusion ) CALL production_e_init
363	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
364	intermediate_timestep_count == 1 ) CALL ws_statistics
365	!
366	!-- In case of nudging calculate current nudging time scale and horizontal
367	!-- means of u, v, pt and q
368	IF ( nudging ) THEN
369	CALL calc_tnudge( simulated_time )
370	CALL calc_mean_profile( u, 1 )
371	CALL calc_mean_profile( v, 2 )
372	CALL calc_mean_profile( pt, 4 )
373	CALL calc_mean_profile( q, 41 )
374	ENDIF
375
376	IF ( radiation .AND. intermediate_timestep_count &
377	== intermediate_timestep_count_max ) THEN
378
379	time_radiation = time_radiation + dt_3d
380
381	IF ( time_radiation >= dt_radiation ) THEN
382
383	CALL cpu_log( log_point(50), 'radiation', 'start' )
384
385	time_radiation = time_radiation - dt_radiation
386	IF ( radiation_scheme == 'clear-sky' ) THEN
387	CALL radiation_clearsky
388	ELSEIF ( radiation_scheme == 'rrtmg' ) THEN
389	CALL radiation_rrtmg
390	ENDIF
391
392	CALL cpu_log( log_point(50), 'radiation', 'stop' )
393	ENDIF
394	ENDIF
395	!
396	!-- Solve the prognostic equations. A fast cache optimized version with
397	!-- only one single loop is used in case of Piascek-Williams advection
398	!-- scheme. NEC vector machines use a different version, because
399	!-- in the other versions a good vectorization is prohibited due to
400	!-- inlining problems.
401	IF ( loop_optimization == 'cache' ) THEN
402	CALL prognostic_equations_cache
403	ELSEIF ( loop_optimization == 'vector' ) THEN
404	CALL prognostic_equations_vector
405	ELSEIF ( loop_optimization == 'acc' ) THEN
406	i_left = nxl; i_right = nxr
407	j_south = nys; j_north = nyn
408	CALL prognostic_equations_acc
409
410	! i_left = nxl; i_right = nxl+nbgp-1
411	! j_south = nys; j_north = nyn
412	! CALL prognostic_equations_acc
413	! i_left = nxr-nbgp+1; i_right = nxr
414	! j_south = nys; j_north = nyn
415	! CALL prognostic_equations_acc
416
417	!
418	!-- Exchange of ghost points (lateral boundary conditions)
419	IF ( background_communication ) THEN
420
421	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
422
423	send_receive = 'lr'
424	sendrecv_in_background = .TRUE.
425	req = 0
426	req_count = 0
427
428	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
429	on_device = .TRUE. ! to be removed after complete porting
430	ELSE ! of ghost point exchange
431	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
432	ENDIF
433
434	CALL exchange_horiz( u_p, nbgp )
435	CALL exchange_horiz( v_p, nbgp )
436	CALL exchange_horiz( w_p, nbgp )
437	CALL exchange_horiz( pt_p, nbgp )
438	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
439	IF ( ocean ) THEN
440	CALL exchange_horiz( sa_p, nbgp )
441	CALL exchange_horiz( rho, nbgp )
442	CALL exchange_horiz( prho, nbgp )
443	ENDIF
444	IF (humidity .OR. passive_scalar) THEN
445	CALL exchange_horiz( q_p, nbgp )
446	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
447	CALL exchange_horiz( qr_p, nbgp )
448	CALL exchange_horiz( nr_p, nbgp )
449	ENDIF
450	ENDIF
451	IF ( cloud_droplets ) THEN
452	CALL exchange_horiz( ql, nbgp )
453	CALL exchange_horiz( ql_c, nbgp )
454	CALL exchange_horiz( ql_v, nbgp )
455	CALL exchange_horiz( ql_vp, nbgp )
456	ENDIF
457	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
458	THEN
459	CALL exchange_horiz( diss, nbgp )
460	ENDIF
461
462	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
463	on_device = .FALSE. ! to be removed after complete porting
464	ELSE ! of ghost point exchange
465	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
466	ENDIF
467
468	sendrecv_in_background = .FALSE.
469
470	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
471
472	ENDIF
473
474	! i_left = nxl+nbgp; i_right = nxr-nbgp
475	! j_south = nys; j_north = nys+nbgp-1
476	! CALL prognostic_equations_acc
477	! i_left = nxl+nbgp; i_right = nxr-nbgp
478	! j_south = nyn-nbgp+1; j_north = nyn
479	! CALL prognostic_equations_acc
480
481	IF ( background_communication ) THEN
482	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
483	#if defined( __parallel )
484	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
485	#endif
486	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
487
488	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
489
490	send_receive = 'ns'
491	sendrecv_in_background = .TRUE.
492	req = 0
493	req_count = 0
494
495	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
496	on_device = .TRUE. ! to be removed after complete porting
497	ELSE ! of ghost point exchange
498	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
499	ENDIF
500
501	CALL exchange_horiz( u_p, nbgp )
502	CALL exchange_horiz( v_p, nbgp )
503	CALL exchange_horiz( w_p, nbgp )
504	CALL exchange_horiz( pt_p, nbgp )
505	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
506	IF ( ocean ) THEN
507	CALL exchange_horiz( sa_p, nbgp )
508	CALL exchange_horiz( rho, nbgp )
509	CALL exchange_horiz( prho, nbgp )
510	ENDIF
511	IF (humidity .OR. passive_scalar) THEN
512	CALL exchange_horiz( q_p, nbgp )
513	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
514	CALL exchange_horiz( qr_p, nbgp )
515	CALL exchange_horiz( nr_p, nbgp )
516	ENDIF
517	ENDIF
518	IF ( cloud_droplets ) THEN
519	CALL exchange_horiz( ql, nbgp )
520	CALL exchange_horiz( ql_c, nbgp )
521	CALL exchange_horiz( ql_v, nbgp )
522	CALL exchange_horiz( ql_vp, nbgp )
523	ENDIF
524	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
525	THEN
526	CALL exchange_horiz( diss, nbgp )
527	ENDIF
528
529	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
530	on_device = .FALSE. ! to be removed after complete porting
531	ELSE ! of ghost point exchange
532	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
533	ENDIF
534
535	sendrecv_in_background = .FALSE.
536
537	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
538
539	ENDIF
540
541	! i_left = nxl+nbgp; i_right = nxr-nbgp
542	! j_south = nys+nbgp; j_north = nyn-nbgp
543	! CALL prognostic_equations_acc
544
545	IF ( background_communication ) THEN
546	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
547	#if defined( __parallel )
548	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
549	#endif
550	send_receive = 'al'
551	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
552	ENDIF
553
554	ENDIF
555
556	!
557	!-- Particle transport/physics with the Lagrangian particle model
558	!-- (only once during intermediate steps, because it uses an Euler-step)
559	!-- ### particle model should be moved before prognostic_equations, in order
560	!-- to regard droplet interactions directly
561	IF ( particle_advection .AND. &
562	simulated_time >= particle_advection_start .AND. &
563	intermediate_timestep_count == 1 ) THEN
564	CALL lpm
565	first_call_lpm = .FALSE.
566	ENDIF
567
568	!
569	!-- Interaction of droplets with temperature and specific humidity.
570	!-- Droplet condensation and evaporation is calculated within
571	!-- advec_particles.
572	IF ( cloud_droplets .AND. &
573	intermediate_timestep_count == intermediate_timestep_count_max )&
574	THEN
575	CALL interaction_droplets_ptq
576	ENDIF
577
578	!
579	!-- Exchange of ghost points (lateral boundary conditions)
580	IF ( .NOT. background_communication ) THEN
581
582	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
583
584	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
585	on_device = .TRUE. ! to be removed after complete porting
586	ELSE ! of ghost point exchange
587	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
588	ENDIF
589
590	CALL exchange_horiz( u_p, nbgp )
591	CALL exchange_horiz( v_p, nbgp )
592	CALL exchange_horiz( w_p, nbgp )
593	CALL exchange_horiz( pt_p, nbgp )
594	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
595	IF ( ocean ) THEN
596	CALL exchange_horiz( sa_p, nbgp )
597	CALL exchange_horiz( rho, nbgp )
598	CALL exchange_horiz( prho, nbgp )
599	ENDIF
600	IF (humidity .OR. passive_scalar) THEN
601	CALL exchange_horiz( q_p, nbgp )
602	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
603	precipitation ) THEN
604	CALL exchange_horiz( qr_p, nbgp )
605	CALL exchange_horiz( nr_p, nbgp )
606	ENDIF
607	ENDIF
608	IF ( cloud_droplets ) THEN
609	CALL exchange_horiz( ql, nbgp )
610	CALL exchange_horiz( ql_c, nbgp )
611	CALL exchange_horiz( ql_v, nbgp )
612	CALL exchange_horiz( ql_vp, nbgp )
613	ENDIF
614	IF ( wang_kernel .OR. turbulence .OR. use_sgs_for_particles ) &
615	THEN
616	CALL exchange_horiz( diss, nbgp )
617	ENDIF
618
619	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
620	on_device = .FALSE. ! to be removed after complete porting
621	ELSE ! of ghost point exchange
622	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
623	ENDIF
624
625	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
626
627	ENDIF
628
629	!
630	!-- Boundary conditions for the prognostic quantities (except of the
631	!-- velocities at the outflow in case of a non-cyclic lateral wall)
632	CALL boundary_conds
633
634	!
635	!-- When using the land surface model:
636	!-- 1) solve energy balance equation to calculate new skin temperature
637	!-- 2) run soil model
638	IF ( land_surface ) THEN
639
640	CALL cpu_log( log_point(54), 'land_surface', 'start' )
641
642	CALL lsm_energy_balance
643	CALL lsm_soil_model
644
645	CALL cpu_log( log_point(54), 'land_surface', 'stop' )
646
647	ENDIF
648
649	!
650	!-- Swap the time levels in preparation for the next time step.
651	CALL swap_timelevel
652
653	!
654	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
655	!-- when a sloping surface is used
656	IF ( sloping_surface ) THEN
657	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
658	pt_slope_offset
659	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
660	pt_slope_offset
661	ENDIF
662
663	!
664	!-- Impose a turbulent inflow using the recycling method
665	IF ( turbulent_inflow ) CALL inflow_turbulence
666
667	!
668	!-- Impose a random perturbation on the horizontal velocity field
669	IF ( create_disturbances .AND. &
670	( call_psolver_at_all_substeps .AND. &
671	intermediate_timestep_count == intermediate_timestep_count_max )&
672	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
673	intermediate_timestep_count == 1 ) ) &
674	THEN
675	time_disturb = time_disturb + dt_3d
676	IF ( time_disturb >= dt_disturb ) THEN
677	!$acc update host( u, v )
678	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
679	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
680	CALL disturb_field( nzb_u_inner, tend, u )
681	CALL disturb_field( nzb_v_inner, tend, v )
682	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
683	!
684	!-- Runs with a non-cyclic lateral wall need perturbations
685	!-- near the inflow throughout the whole simulation
686	dist_range = 1
687	CALL disturb_field( nzb_u_inner, tend, u )
688	CALL disturb_field( nzb_v_inner, tend, v )
689	dist_range = 0
690	ENDIF
691	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
692	!$acc update device( u, v )
693	time_disturb = time_disturb - dt_disturb
694	ENDIF
695	ENDIF
696
697	!
698	!-- Reduce the velocity divergence via the equation for perturbation
699	!-- pressure.
700	IF ( intermediate_timestep_count == 1 .OR. &
701	call_psolver_at_all_substeps ) THEN
702	CALL pres
703	ENDIF
704
705	!
706	!-- If required, compute liquid water content
707	IF ( cloud_physics ) THEN
708	CALL calc_liquid_water_content
709	!$acc update device( ql )
710	ENDIF
711	!
712	!-- If required, compute virtual potential temperature
713	IF ( humidity ) THEN
714	CALL compute_vpt
715	!$acc update device( vpt )
716	ENDIF
717
718	!
719	!-- Compute the diffusion quantities
720	IF ( .NOT. constant_diffusion ) THEN
721
722	!
723	!-- Determine surface fluxes shf and qsws and surface values
724	!-- pt_surface and q_surface in dependence on data from external
725	!-- file LSF_DATA respectively
726	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
727	intermediate_timestep_count == intermediate_timestep_count_max )&
728	THEN
729	CALL ls_forcing_surf ( simulated_time )
730	ENDIF
731
732	!
733	!-- First the vertical fluxes in the Prandtl layer are being computed
734	IF ( prandtl_layer ) THEN
735	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
736	CALL prandtl_fluxes
737	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
738	ENDIF
739
740	!
741	!-- Compute the diffusion coefficients
742	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
743	IF ( .NOT. humidity ) THEN
744	IF ( ocean ) THEN
745	CALL diffusivities( prho, prho_reference )
746	ELSE
747	CALL diffusivities( pt, pt_reference )
748	ENDIF
749	ELSE
750	CALL diffusivities( vpt, pt_reference )
751	ENDIF
752	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
753
754	ENDIF
755
756	ENDDO ! Intermediate step loop
757
758	!
759	!-- Increase simulation time and output times
760	nr_timesteps_this_run = nr_timesteps_this_run + 1
761	current_timestep_number = current_timestep_number + 1
762	simulated_time = simulated_time + dt_3d
763	simulated_time_chr = time_to_string( simulated_time )
764	time_since_reference_point = simulated_time - coupling_start_time
765
766	IF ( simulated_time >= skip_time_data_output_av ) THEN
767	time_do_av = time_do_av + dt_3d
768	ENDIF
769	IF ( simulated_time >= skip_time_do2d_xy ) THEN
770	time_do2d_xy = time_do2d_xy + dt_3d
771	ENDIF
772	IF ( simulated_time >= skip_time_do2d_xz ) THEN
773	time_do2d_xz = time_do2d_xz + dt_3d
774	ENDIF
775	IF ( simulated_time >= skip_time_do2d_yz ) THEN
776	time_do2d_yz = time_do2d_yz + dt_3d
777	ENDIF
778	IF ( simulated_time >= skip_time_do3d ) THEN
779	time_do3d = time_do3d + dt_3d
780	ENDIF
781	DO mid = 1, masks
782	IF ( simulated_time >= skip_time_domask(mid) ) THEN
783	time_domask(mid)= time_domask(mid) + dt_3d
784	ENDIF
785	ENDDO
786	time_dvrp = time_dvrp + dt_3d
787	IF ( simulated_time >= skip_time_dosp ) THEN
788	time_dosp = time_dosp + dt_3d
789	ENDIF
790	time_dots = time_dots + dt_3d
791	IF ( .NOT. first_call_lpm ) THEN
792	time_dopts = time_dopts + dt_3d
793	ENDIF
794	IF ( simulated_time >= skip_time_dopr ) THEN
795	time_dopr = time_dopr + dt_3d
796	ENDIF
797	time_dopr_listing = time_dopr_listing + dt_3d
798	time_run_control = time_run_control + dt_3d
799
800	!
801	!-- Data exchange between coupled models
802	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
803	time_coupling = time_coupling + dt_3d
804
805	!
806	!-- In case of model termination initiated by the local model
807	!-- (terminate_coupled > 0), the coupler must be skipped because it would
808	!-- cause an MPI intercomminucation hang.
809	!-- If necessary, the coupler will be called at the beginning of the
810	!-- next restart run.
811	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
812	CALL surface_coupler
813	time_coupling = time_coupling - dt_coupling
814	ENDDO
815	ENDIF
816
817	!
818	!-- Execute user-defined actions
819	CALL user_actions( 'after_integration' )
820
821	!
822	!-- If Galilei transformation is used, determine the distance that the
823	!-- model has moved so far
824	IF ( galilei_transformation ) THEN
825	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
826	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
827	ENDIF
828
829	!
830	!-- Check, if restart is necessary (because cpu-time is expiring or
831	!-- because it is forced by user) and set stop flag
832	!-- This call is skipped if the remote model has already initiated a restart.
833	IF ( .NOT. terminate_run ) CALL check_for_restart
834
835	!
836	!-- Carry out statistical analysis and output at the requested output times.
837	!-- The MOD function is used for calculating the output time counters (like
838	!-- time_dopr) in order to regard a possible decrease of the output time
839	!-- interval in case of restart runs
840
841	!
842	!-- Set a flag indicating that so far no statistics have been created
843	!-- for this time step
844	flow_statistics_called = .FALSE.
845
846	!
847	!-- If required, call flow_statistics for averaging in time
848	IF ( averaging_interval_pr /= 0.0_wp .AND. &
849	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
850	simulated_time >= skip_time_dopr ) THEN
851	time_dopr_av = time_dopr_av + dt_3d
852	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
853	do_sum = .TRUE.
854	time_dopr_av = MOD( time_dopr_av, &
855	MAX( dt_averaging_input_pr, dt_3d ) )
856	ENDIF
857	ENDIF
858	IF ( do_sum ) CALL flow_statistics
859
860	!
861	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
862	IF ( averaging_interval /= 0.0_wp .AND. &
863	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
864	simulated_time >= skip_time_data_output_av ) &
865	THEN
866	time_do_sla = time_do_sla + dt_3d
867	IF ( time_do_sla >= dt_averaging_input ) THEN
868	CALL sum_up_3d_data
869	average_count_3d = average_count_3d + 1
870	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
871	ENDIF
872	ENDIF
873
874	!
875	!-- Calculate spectra for time averaging
876	IF ( averaging_interval_sp /= 0.0_wp .AND. &
877	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
878	simulated_time >= skip_time_dosp ) THEN
879	time_dosp_av = time_dosp_av + dt_3d
880	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
881	CALL calc_spectra
882	time_dosp_av = MOD( time_dosp_av, &
883	MAX( dt_averaging_input_pr, dt_3d ) )
884	ENDIF
885	ENDIF
886
887	!
888	!-- Computation and output of run control parameters.
889	!-- This is also done whenever perturbations have been imposed
890	IF ( time_run_control >= dt_run_control .OR. &
891	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
892	THEN
893	CALL run_control
894	IF ( time_run_control >= dt_run_control ) THEN
895	time_run_control = MOD( time_run_control, &
896	MAX( dt_run_control, dt_3d ) )
897	ENDIF
898	ENDIF
899
900	!
901	!-- Profile output (ASCII) on file
902	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
903	CALL print_1d
904	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
905	dt_3d ) )
906	ENDIF
907
908	!
909	!-- Graphic output for PROFIL
910	IF ( time_dopr >= dt_dopr ) THEN
911	IF ( dopr_n /= 0 ) CALL data_output_profiles
912	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
913	time_dopr_av = 0.0_wp ! due to averaging (see above)
914	ENDIF
915
916	!
917	!-- Graphic output for time series
918	IF ( time_dots >= dt_dots ) THEN
919	CALL data_output_tseries
920	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
921	ENDIF
922
923	!
924	!-- Output of spectra (formatted for use with PROFIL), in case of no
925	!-- time averaging, spectra has to be calculated before
926	IF ( time_dosp >= dt_dosp ) THEN
927	IF ( average_count_sp == 0 ) CALL calc_spectra
928	CALL data_output_spectra
929	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
930	ENDIF
931
932	!
933	!-- 2d-data output (cross-sections)
934	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
935	CALL data_output_2d( 'xy', 0 )
936	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
937	ENDIF
938	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
939	CALL data_output_2d( 'xz', 0 )
940	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
941	ENDIF
942	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
943	CALL data_output_2d( 'yz', 0 )
944	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
945	ENDIF
946
947	!
948	!-- 3d-data output (volume data)
949	IF ( time_do3d >= dt_do3d ) THEN
950	CALL data_output_3d( 0 )
951	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
952	ENDIF
953
954	!
955	!-- masked data output
956	!-- Parallel netcdf output is not tested so far for masked data, hence
957	!-- netcdf_data_format is switched back to non-paralell output.
958	netcdf_data_format_save = netcdf_data_format
959	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
960	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
961	DO mid = 1, masks
962	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
963	CALL data_output_mask( 0 )
964	time_domask(mid) = MOD( time_domask(mid), &
965	MAX( dt_domask(mid), dt_3d ) )
966	ENDIF
967	ENDDO
968	netcdf_data_format = netcdf_data_format_save
969
970	!
971	!-- Output of time-averaged 2d/3d/masked data
972	IF ( time_do_av >= dt_data_output_av ) THEN
973	CALL average_3d_data
974	CALL data_output_2d( 'xy', 1 )
975	CALL data_output_2d( 'xz', 1 )
976	CALL data_output_2d( 'yz', 1 )
977	CALL data_output_3d( 1 )
978	!-- Parallel netcdf output is not tested so far for masked data, hence
979	!-- netcdf_data_format is switched back to non-paralell output.
980	netcdf_data_format_save = netcdf_data_format
981	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
982	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
983	DO mid = 1, masks
984	CALL data_output_mask( 1 )
985	ENDDO
986	netcdf_data_format = netcdf_data_format_save
987	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
988	ENDIF
989
990	!
991	!-- Output of particle time series
992	IF ( particle_advection ) THEN
993	IF ( time_dopts >= dt_dopts .OR. &
994	( simulated_time >= particle_advection_start .AND. &
995	first_call_lpm ) ) THEN
996	CALL data_output_ptseries
997	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
998	ENDIF
999	ENDIF
1000
1001	!
1002	!-- Output of dvrp-graphics (isosurface, particles, slicer)
1003	#if defined( __dvrp_graphics )
1004	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1005	#endif
1006	IF ( time_dvrp >= dt_dvrp ) THEN
1007	CALL data_output_dvrp
1008	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1009	ENDIF
1010	#if defined( __dvrp_graphics )
1011	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1012	#endif
1013
1014	!
1015	!-- If required, set the heat flux for the next time step at a random value
1016	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
1017
1018	!
1019	!-- Execute user-defined actions
1020	CALL user_actions( 'after_timestep' )
1021
1022	!
1023	!-- Output elapsed simulated time in form of a progress bar on stdout
1024	IF ( myid == 0 ) CALL output_progress_bar
1025
1026	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1027
1028
1029	ENDDO ! time loop
1030
1031	IF ( myid == 0 ) CALL finish_progress_bar
1032
1033	#if defined( __dvrp_graphics )
1034	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1035	#endif
1036
1037	CALL location_message( 'finished time-stepping', .TRUE. )
1038
1039	END SUBROUTINE time_integration

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