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source: palm/trunk/SOURCE/time_integration.f90 @ 1383

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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 1381 2014-04-28 12:41:59Z boeske $
27	!
28	! 1380 2014-04-28 12:40:45Z heinze
29	! CALL of nudge_ref added
30	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
31	!
32	! 1365 2014-04-22 15:03:56Z boeske
33	! Reset sums_ls_l to zero at each timestep
34	! +sums_ls_l
35	! Calculation of reference state (previously in subroutine calc_mean_profile)
36
37	! 1342 2014-03-26 17:04:47Z kanani
38	! REAL constants defined as wp-kind
39	!
40	! 1320 2014-03-20 08:40:49Z raasch
41	! ONLY-attribute added to USE-statements,
42	! kind-parameters added to all INTEGER and REAL declaration statements,
43	! kinds are defined in new module kinds,
44	! old module precision_kind is removed,
45	! revision history before 2012 removed,
46	! comment fields (!:) to be used for variable explanations added to
47	! all variable declaration statements
48	! 1318 2014-03-17 13:35:16Z raasch
49	! module interfaces removed
50	!
51	! 1308 2014-03-13 14:58:42Z fricke
52	! +netcdf_data_format_save
53	! For masked data, parallel netcdf output is not tested so far, hence
54	! netcdf_data_format is switched back to non-paralell output.
55	!
56	! 1276 2014-01-15 13:40:41Z heinze
57	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
58	!
59	! 1257 2013-11-08 15:18:40Z raasch
60	! acc-update-host directive for timestep removed
61	!
62	! 1241 2013-10-30 11:36:58Z heinze
63	! Generalize calc_mean_profile for wider use
64	! Determine shf and qsws in dependence on data from LSF_DATA
65	! Determine ug and vg in dependence on data from LSF_DATA
66	! 1221 2013-09-10 08:59:13Z raasch
67	! host update of arrays before timestep is called
68	!
69	! 1179 2013-06-14 05:57:58Z raasch
70	! mean profiles for reference state are only calculated if required,
71	! small bugfix for background communication
72	!
73	! 1171 2013-05-30 11:27:45Z raasch
74	! split of prognostic_equations deactivated (comment lines), for the time being
75	!
76	! 1128 2013-04-12 06:19:32Z raasch
77	! asynchronous transfer of ghost point data realized for acc-optimized version:
78	! prognostic_equations are first called two times for those points required for
79	! the left-right and north-south exchange, respectively, and then for the
80	! remaining points,
81	! those parts requiring global communication moved from prognostic_equations to
82	! here
83	!
84	! 1115 2013-03-26 18:16:16Z hoffmann
85	! calculation of qr and nr is restricted to precipitation
86	!
87	! 1113 2013-03-10 02:48:14Z raasch
88	! GPU-porting of boundary conditions,
89	! openACC directives updated
90	! formal parameter removed from routine boundary_conds
91	!
92	! 1111 2013-03-08 23:54:10Z raasch
93	! +internal timestep counter for cpu statistics added,
94	! openACC directives updated
95	!
96	! 1092 2013-02-02 11:24:22Z raasch
97	! unused variables removed
98	!
99	! 1065 2012-11-22 17:42:36Z hoffmann
100	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
101	!
102	! 1053 2012-11-13 17:11:03Z hoffmann
103	! exchange of ghost points for nr, qr added
104	!
105	! 1036 2012-10-22 13:43:42Z raasch
106	! code put under GPL (PALM 3.9)
107	!
108	! 1019 2012-09-28 06:46:45Z raasch
109	! non-optimized version of prognostic_equations removed
110	!
111	! 1015 2012-09-27 09:23:24Z raasch
112	! +call of prognostic_equations_acc
113	!
114	! 1001 2012-09-13 14:08:46Z raasch
115	! all actions concerning leapfrog- and upstream-spline-scheme removed
116	!
117	! 849 2012-03-15 10:35:09Z raasch
118	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
119	!
120	! 825 2012-02-19 03:03:44Z raasch
121	! wang_collision_kernel renamed wang_kernel
122	!
123	! Revision 1.1 1997/08/11 06:19:04 raasch
124	! Initial revision
125	!
126	!
127	! Description:
128	! ------------
129	! Integration in time of the model equations, statistical analysis and graphic
130	! output
131	!------------------------------------------------------------------------------!
132
133	USE advec_ws, &
134	ONLY: ws_statistics
135
136	USE arrays_3d, &
137	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
138	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
139	u_p, v, vpt, v_p, w_p
140
141	USE calc_mean_profile_mod, &
142	ONLY: calc_mean_profile
143
144	USE control_parameters, &
145	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
146	average_count_sp, averaging_interval, averaging_interval_pr, &
147	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
148	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
149	cloud_physics, constant_heatflux, create_disturbances, dopr_n, &
150	constant_diffusion, coupling_mode, coupling_start_time, &
151	current_timestep_number, disturbance_created, &
152	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
153	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
154	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
155	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
156	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
157	end_time, first_call_lpm, galilei_transformation, humidity, &
158	icloud_scheme, intermediate_timestep_count, &
159	intermediate_timestep_count_max, large_scale_forcing, &
160	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
161	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
162	ocean, on_device, passive_scalar, prandtl_layer, precipitation, &
163	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
164	run_coupled, simulated_time, simulated_time_chr, &
165	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
166	skip_time_do3d, skip_time_domask, skip_time_dopr, &
167	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
168	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
169	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
170	time_do3d, time_domask, time_dopr, time_dopr_av, &
171	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
172	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
173	time_run_control, time_since_reference_point, turbulence, &
174	turbulent_inflow, use_initial_profile_as_reference, &
175	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
176	ws_scheme_sca
177
178	USE cpulog, &
179	ONLY: cpu_log, log_point, log_point_s
180
181	USE indices, &
182	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
183	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
184
185	USE interaction_droplets_ptq_mod, &
186	ONLY: interaction_droplets_ptq
187
188	USE kinds
189
190	USE ls_forcing_mod, &
191	ONLY: ls_forcing_surf, ls_forcing_vert
192
193	USE nudge_mod, &
194	ONLY: calc_tnudge, nudge_ref
195
196	USE particle_attributes, &
197	ONLY: particle_advection, particle_advection_start, wang_kernel
198
199	USE pegrid
200
201	USE production_e_mod, &
202	ONLY: production_e_init
203
204	USE prognostic_equations_mod, &
205	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
206	prognostic_equations_vector
207
208	USE statistics, &
209	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
210
211	USE user_actions_mod, &
212	ONLY: user_actions
213
214	IMPLICIT NONE
215
216	CHARACTER (LEN=9) :: time_to_string !:
217
218	INTEGER(iwp) :: netcdf_data_format_save !:
219
220	!
221	!-- At the beginning of a simulation determine the time step as well as
222	!-- determine and print out the run control parameters
223	IF ( simulated_time == 0.0_wp ) CALL timestep
224
225	CALL run_control
226
227
228	!
229	!-- Data exchange between coupled models in case that a call has been omitted
230	!-- at the end of the previous run of a job chain.
231	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
232	!
233	!-- In case of model termination initiated by the local model the coupler
234	!-- must not be called because this would again cause an MPI hang.
235	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
236	CALL surface_coupler
237	time_coupling = time_coupling - dt_coupling
238	ENDDO
239	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
240	THEN
241	time_coupling = time_since_reference_point
242	ENDIF
243	ENDIF
244
245
246	#if defined( __dvrp_graphics )
247	!
248	!-- Time measurement with dvrp software
249	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
250	#endif
251
252	!
253	!-- Start of the time loop
254	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
255	.NOT. terminate_run )
256
257	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
258
259	!
260	!-- Determine size of next time step
261	IF ( simulated_time /= 0.0_wp ) THEN
262	CALL timestep
263	ENDIF
264
265	!
266	!-- Determine ug, vg and w_subs in dependence on data from external file
267	!-- LSF_DATA
268	IF ( large_scale_forcing .AND. lsf_vert ) THEN
269	CALL ls_forcing_vert ( simulated_time )
270	sums_ls_l = 0.0_wp
271	ENDIF
272
273	!
274	!-- Set pt_init and q_init to the current profiles taken from
275	!-- NUDGING_DATA
276	IF ( nudging ) THEN
277	CALL nudge_ref ( simulated_time )
278	!
279	!-- Store temperature gradient at the top boundary for possible Neumann
280	!-- boundary condition
281	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
282	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
283	ENDIF
284
285	!
286	!-- Execute the user-defined actions
287	CALL user_actions( 'before_timestep' )
288
289	!
290	!-- Start of intermediate step loop
291	intermediate_timestep_count = 0
292	DO WHILE ( intermediate_timestep_count < &
293	intermediate_timestep_count_max )
294
295	intermediate_timestep_count = intermediate_timestep_count + 1
296
297	!
298	!-- Set the steering factors for the prognostic equations which depend
299	!-- on the timestep scheme
300	CALL timestep_scheme_steering
301
302	!
303	!-- Calculate those variables needed in the tendency terms which need
304	!-- global communication
305	IF ( .NOT. use_single_reference_value .AND. &
306	.NOT. use_initial_profile_as_reference ) THEN
307	!
308	!-- Horizontally averaged profiles to be used as reference state in
309	!-- buoyancy terms (WARNING: only the respective last call of
310	!-- calc_mean_profile defines the reference state!)
311	IF ( .NOT. neutral ) THEN
312	CALL calc_mean_profile( pt, 4 )
313	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
314	ENDIF
315	IF ( ocean ) THEN
316	CALL calc_mean_profile( rho, 64 )
317	ref_state(:) = hom(:,1,64,0)
318	ENDIF
319	IF ( humidity ) THEN
320	CALL calc_mean_profile( vpt, 44 )
321	ref_state(:) = hom(:,1,44,0)
322	ENDIF
323
324	ENDIF
325
326	IF ( .NOT. constant_diffusion ) CALL production_e_init
327	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
328	intermediate_timestep_count == 1 ) CALL ws_statistics
329	!
330	!-- In case of nudging calculate current nudging time scale and horizontal
331	!-- means of u, v, pt and q
332	IF ( nudging ) THEN
333	CALL calc_tnudge( simulated_time )
334	CALL calc_mean_profile( u, 1 )
335	CALL calc_mean_profile( v, 2 )
336	CALL calc_mean_profile( pt, 4 )
337	CALL calc_mean_profile( q, 41 )
338	ENDIF
339
340	!
341	!-- Solve the prognostic equations. A fast cache optimized version with
342	!-- only one single loop is used in case of Piascek-Williams advection
343	!-- scheme. NEC vector machines use a different version, because
344	!-- in the other versions a good vectorization is prohibited due to
345	!-- inlining problems.
346	IF ( loop_optimization == 'cache' ) THEN
347	CALL prognostic_equations_cache
348	ELSEIF ( loop_optimization == 'vector' ) THEN
349	CALL prognostic_equations_vector
350	ELSEIF ( loop_optimization == 'acc' ) THEN
351	i_left = nxl; i_right = nxr
352	j_south = nys; j_north = nyn
353	CALL prognostic_equations_acc
354
355	! i_left = nxl; i_right = nxl+nbgp-1
356	! j_south = nys; j_north = nyn
357	! CALL prognostic_equations_acc
358	! i_left = nxr-nbgp+1; i_right = nxr
359	! j_south = nys; j_north = nyn
360	! CALL prognostic_equations_acc
361
362	!
363	!-- Exchange of ghost points (lateral boundary conditions)
364	IF ( background_communication ) THEN
365
366	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
367
368	send_receive = 'lr'
369	sendrecv_in_background = .TRUE.
370	req = 0
371	req_count = 0
372
373	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
374	on_device = .TRUE. ! to be removed after complete porting
375	ELSE ! of ghost point exchange
376	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
377	ENDIF
378
379	CALL exchange_horiz( u_p, nbgp )
380	CALL exchange_horiz( v_p, nbgp )
381	CALL exchange_horiz( w_p, nbgp )
382	CALL exchange_horiz( pt_p, nbgp )
383	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
384	IF ( ocean ) THEN
385	CALL exchange_horiz( sa_p, nbgp )
386	CALL exchange_horiz( rho, nbgp )
387	CALL exchange_horiz( prho, nbgp )
388	ENDIF
389	IF (humidity .OR. passive_scalar) THEN
390	CALL exchange_horiz( q_p, nbgp )
391	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
392	CALL exchange_horiz( qr_p, nbgp )
393	CALL exchange_horiz( nr_p, nbgp )
394	ENDIF
395	ENDIF
396	IF ( cloud_droplets ) THEN
397	CALL exchange_horiz( ql, nbgp )
398	CALL exchange_horiz( ql_c, nbgp )
399	CALL exchange_horiz( ql_v, nbgp )
400	CALL exchange_horiz( ql_vp, nbgp )
401	ENDIF
402	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
403
404	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
405	on_device = .FALSE. ! to be removed after complete porting
406	ELSE ! of ghost point exchange
407	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
408	ENDIF
409
410	sendrecv_in_background = .FALSE.
411
412	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
413
414	ENDIF
415
416	! i_left = nxl+nbgp; i_right = nxr-nbgp
417	! j_south = nys; j_north = nys+nbgp-1
418	! CALL prognostic_equations_acc
419	! i_left = nxl+nbgp; i_right = nxr-nbgp
420	! j_south = nyn-nbgp+1; j_north = nyn
421	! CALL prognostic_equations_acc
422
423	IF ( background_communication ) THEN
424	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
425	#if defined( __parallel )
426	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
427	#endif
428	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
429
430	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
431
432	send_receive = 'ns'
433	sendrecv_in_background = .TRUE.
434	req = 0
435	req_count = 0
436
437	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
438	on_device = .TRUE. ! to be removed after complete porting
439	ELSE ! of ghost point exchange
440	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
441	ENDIF
442
443	CALL exchange_horiz( u_p, nbgp )
444	CALL exchange_horiz( v_p, nbgp )
445	CALL exchange_horiz( w_p, nbgp )
446	CALL exchange_horiz( pt_p, nbgp )
447	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
448	IF ( ocean ) THEN
449	CALL exchange_horiz( sa_p, nbgp )
450	CALL exchange_horiz( rho, nbgp )
451	CALL exchange_horiz( prho, nbgp )
452	ENDIF
453	IF (humidity .OR. passive_scalar) THEN
454	CALL exchange_horiz( q_p, nbgp )
455	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
456	CALL exchange_horiz( qr_p, nbgp )
457	CALL exchange_horiz( nr_p, nbgp )
458	ENDIF
459	ENDIF
460	IF ( cloud_droplets ) THEN
461	CALL exchange_horiz( ql, nbgp )
462	CALL exchange_horiz( ql_c, nbgp )
463	CALL exchange_horiz( ql_v, nbgp )
464	CALL exchange_horiz( ql_vp, nbgp )
465	ENDIF
466	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
467
468	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
469	on_device = .FALSE. ! to be removed after complete porting
470	ELSE ! of ghost point exchange
471	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
472	ENDIF
473
474	sendrecv_in_background = .FALSE.
475
476	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
477
478	ENDIF
479
480	! i_left = nxl+nbgp; i_right = nxr-nbgp
481	! j_south = nys+nbgp; j_north = nyn-nbgp
482	! CALL prognostic_equations_acc
483
484	IF ( background_communication ) THEN
485	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
486	#if defined( __parallel )
487	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
488	#endif
489	send_receive = 'al'
490	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
491	ENDIF
492
493	ENDIF
494
495	!
496	!-- Particle transport/physics with the Lagrangian particle model
497	!-- (only once during intermediate steps, because it uses an Euler-step)
498	!-- ### particle model should be moved before prognostic_equations, in order
499	!-- to regard droplet interactions directly
500	IF ( particle_advection .AND. &
501	simulated_time >= particle_advection_start .AND. &
502	intermediate_timestep_count == 1 ) THEN
503	CALL lpm
504	first_call_lpm = .FALSE.
505	ENDIF
506
507	!
508	!-- Interaction of droplets with temperature and specific humidity.
509	!-- Droplet condensation and evaporation is calculated within
510	!-- advec_particles.
511	IF ( cloud_droplets .AND. &
512	intermediate_timestep_count == intermediate_timestep_count_max )&
513	THEN
514	CALL interaction_droplets_ptq
515	ENDIF
516
517	!
518	!-- Exchange of ghost points (lateral boundary conditions)
519	IF ( .NOT. background_communication ) THEN
520
521	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
522
523	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
524	on_device = .TRUE. ! to be removed after complete porting
525	ELSE ! of ghost point exchange
526	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
527	ENDIF
528
529	CALL exchange_horiz( u_p, nbgp )
530	CALL exchange_horiz( v_p, nbgp )
531	CALL exchange_horiz( w_p, nbgp )
532	CALL exchange_horiz( pt_p, nbgp )
533	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
534	IF ( ocean ) THEN
535	CALL exchange_horiz( sa_p, nbgp )
536	CALL exchange_horiz( rho, nbgp )
537	CALL exchange_horiz( prho, nbgp )
538	ENDIF
539	IF (humidity .OR. passive_scalar) THEN
540	CALL exchange_horiz( q_p, nbgp )
541	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
542	precipitation ) THEN
543	CALL exchange_horiz( qr_p, nbgp )
544	CALL exchange_horiz( nr_p, nbgp )
545	ENDIF
546	ENDIF
547	IF ( cloud_droplets ) THEN
548	CALL exchange_horiz( ql, nbgp )
549	CALL exchange_horiz( ql_c, nbgp )
550	CALL exchange_horiz( ql_v, nbgp )
551	CALL exchange_horiz( ql_vp, nbgp )
552	ENDIF
553	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
554
555	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
556	on_device = .FALSE. ! to be removed after complete porting
557	ELSE ! of ghost point exchange
558	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
559	ENDIF
560
561	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
562
563	ENDIF
564
565	!
566	!-- Boundary conditions for the prognostic quantities (except of the
567	!-- velocities at the outflow in case of a non-cyclic lateral wall)
568	CALL boundary_conds
569
570	!
571	!-- Swap the time levels in preparation for the next time step.
572	CALL swap_timelevel
573
574	!
575	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
576	!-- when a sloping surface is used
577	IF ( sloping_surface ) THEN
578	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
579	pt_slope_offset
580	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
581	pt_slope_offset
582	ENDIF
583
584	!
585	!-- Impose a turbulent inflow using the recycling method
586	IF ( turbulent_inflow ) CALL inflow_turbulence
587
588	!
589	!-- Impose a random perturbation on the horizontal velocity field
590	IF ( create_disturbances .AND. &
591	( call_psolver_at_all_substeps .AND. &
592	intermediate_timestep_count == intermediate_timestep_count_max )&
593	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
594	intermediate_timestep_count == 1 ) ) &
595	THEN
596	time_disturb = time_disturb + dt_3d
597	IF ( time_disturb >= dt_disturb ) THEN
598	!$acc update host( u, v )
599	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
600	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
601	CALL disturb_field( nzb_u_inner, tend, u )
602	CALL disturb_field( nzb_v_inner, tend, v )
603	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
604	!
605	!-- Runs with a non-cyclic lateral wall need perturbations
606	!-- near the inflow throughout the whole simulation
607	dist_range = 1
608	CALL disturb_field( nzb_u_inner, tend, u )
609	CALL disturb_field( nzb_v_inner, tend, v )
610	dist_range = 0
611	ENDIF
612	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
613	!$acc update device( u, v )
614	time_disturb = time_disturb - dt_disturb
615	ENDIF
616	ENDIF
617
618	!
619	!-- Reduce the velocity divergence via the equation for perturbation
620	!-- pressure.
621	IF ( intermediate_timestep_count == 1 .OR. &
622	call_psolver_at_all_substeps ) THEN
623	CALL pres
624	ENDIF
625
626	!
627	!-- If required, compute liquid water content
628	IF ( cloud_physics ) THEN
629	CALL calc_liquid_water_content
630	!$acc update device( ql )
631	ENDIF
632	!
633	!-- If required, compute virtual potential temperature
634	IF ( humidity ) THEN
635	CALL compute_vpt
636	!$acc update device( vpt )
637	ENDIF
638	!
639	!-- Compute the diffusion quantities
640	IF ( .NOT. constant_diffusion ) THEN
641
642	!
643	!-- Determine surface fluxes shf and qsws and surface values
644	!-- pt_surface and q_surface in dependence on data from external
645	!-- file LSF_DATA respectively
646	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
647	intermediate_timestep_count == intermediate_timestep_count_max )&
648	THEN
649	CALL ls_forcing_surf ( simulated_time )
650	ENDIF
651
652	!
653	!-- First the vertical fluxes in the Prandtl layer are being computed
654	IF ( prandtl_layer ) THEN
655	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
656	CALL prandtl_fluxes
657	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
658	ENDIF
659
660	!
661	!-- Compute the diffusion coefficients
662	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
663	IF ( .NOT. humidity ) THEN
664	IF ( ocean ) THEN
665	CALL diffusivities( prho, prho_reference )
666	ELSE
667	CALL diffusivities( pt, pt_reference )
668	ENDIF
669	ELSE
670	CALL diffusivities( vpt, pt_reference )
671	ENDIF
672	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
673
674	ENDIF
675
676	ENDDO ! Intermediate step loop
677
678	!
679	!-- Increase simulation time and output times
680	nr_timesteps_this_run = nr_timesteps_this_run + 1
681	current_timestep_number = current_timestep_number + 1
682	simulated_time = simulated_time + dt_3d
683	simulated_time_chr = time_to_string( simulated_time )
684	time_since_reference_point = simulated_time - coupling_start_time
685
686	IF ( simulated_time >= skip_time_data_output_av ) THEN
687	time_do_av = time_do_av + dt_3d
688	ENDIF
689	IF ( simulated_time >= skip_time_do2d_xy ) THEN
690	time_do2d_xy = time_do2d_xy + dt_3d
691	ENDIF
692	IF ( simulated_time >= skip_time_do2d_xz ) THEN
693	time_do2d_xz = time_do2d_xz + dt_3d
694	ENDIF
695	IF ( simulated_time >= skip_time_do2d_yz ) THEN
696	time_do2d_yz = time_do2d_yz + dt_3d
697	ENDIF
698	IF ( simulated_time >= skip_time_do3d ) THEN
699	time_do3d = time_do3d + dt_3d
700	ENDIF
701	DO mid = 1, masks
702	IF ( simulated_time >= skip_time_domask(mid) ) THEN
703	time_domask(mid)= time_domask(mid) + dt_3d
704	ENDIF
705	ENDDO
706	time_dvrp = time_dvrp + dt_3d
707	IF ( simulated_time >= skip_time_dosp ) THEN
708	time_dosp = time_dosp + dt_3d
709	ENDIF
710	time_dots = time_dots + dt_3d
711	IF ( .NOT. first_call_lpm ) THEN
712	time_dopts = time_dopts + dt_3d
713	ENDIF
714	IF ( simulated_time >= skip_time_dopr ) THEN
715	time_dopr = time_dopr + dt_3d
716	ENDIF
717	time_dopr_listing = time_dopr_listing + dt_3d
718	time_run_control = time_run_control + dt_3d
719
720	!
721	!-- Data exchange between coupled models
722	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
723	time_coupling = time_coupling + dt_3d
724
725	!
726	!-- In case of model termination initiated by the local model
727	!-- (terminate_coupled > 0), the coupler must be skipped because it would
728	!-- cause an MPI intercomminucation hang.
729	!-- If necessary, the coupler will be called at the beginning of the
730	!-- next restart run.
731	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
732	CALL surface_coupler
733	time_coupling = time_coupling - dt_coupling
734	ENDDO
735	ENDIF
736
737	!
738	!-- Execute user-defined actions
739	CALL user_actions( 'after_integration' )
740
741	!
742	!-- If Galilei transformation is used, determine the distance that the
743	!-- model has moved so far
744	IF ( galilei_transformation ) THEN
745	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
746	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
747	ENDIF
748
749	!
750	!-- Check, if restart is necessary (because cpu-time is expiring or
751	!-- because it is forced by user) and set stop flag
752	!-- This call is skipped if the remote model has already initiated a restart.
753	IF ( .NOT. terminate_run ) CALL check_for_restart
754
755	!
756	!-- Carry out statistical analysis and output at the requested output times.
757	!-- The MOD function is used for calculating the output time counters (like
758	!-- time_dopr) in order to regard a possible decrease of the output time
759	!-- interval in case of restart runs
760
761	!
762	!-- Set a flag indicating that so far no statistics have been created
763	!-- for this time step
764	flow_statistics_called = .FALSE.
765
766	!
767	!-- If required, call flow_statistics for averaging in time
768	IF ( averaging_interval_pr /= 0.0_wp .AND. &
769	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
770	simulated_time >= skip_time_dopr ) THEN
771	time_dopr_av = time_dopr_av + dt_3d
772	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
773	do_sum = .TRUE.
774	time_dopr_av = MOD( time_dopr_av, &
775	MAX( dt_averaging_input_pr, dt_3d ) )
776	ENDIF
777	ENDIF
778	IF ( do_sum ) CALL flow_statistics
779
780	!
781	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
782	IF ( averaging_interval /= 0.0_wp .AND. &
783	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
784	simulated_time >= skip_time_data_output_av ) &
785	THEN
786	time_do_sla = time_do_sla + dt_3d
787	IF ( time_do_sla >= dt_averaging_input ) THEN
788	CALL sum_up_3d_data
789	average_count_3d = average_count_3d + 1
790	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
791	ENDIF
792	ENDIF
793
794	!
795	!-- Calculate spectra for time averaging
796	IF ( averaging_interval_sp /= 0.0_wp .AND. &
797	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
798	simulated_time >= skip_time_dosp ) THEN
799	time_dosp_av = time_dosp_av + dt_3d
800	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
801	CALL calc_spectra
802	time_dosp_av = MOD( time_dosp_av, &
803	MAX( dt_averaging_input_pr, dt_3d ) )
804	ENDIF
805	ENDIF
806
807	!
808	!-- Computation and output of run control parameters.
809	!-- This is also done whenever perturbations have been imposed
810	IF ( time_run_control >= dt_run_control .OR. &
811	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
812	THEN
813	CALL run_control
814	IF ( time_run_control >= dt_run_control ) THEN
815	time_run_control = MOD( time_run_control, &
816	MAX( dt_run_control, dt_3d ) )
817	ENDIF
818	ENDIF
819
820	!
821	!-- Profile output (ASCII) on file
822	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
823	CALL print_1d
824	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
825	dt_3d ) )
826	ENDIF
827
828	!
829	!-- Graphic output for PROFIL
830	IF ( time_dopr >= dt_dopr ) THEN
831	IF ( dopr_n /= 0 ) CALL data_output_profiles
832	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
833	time_dopr_av = 0.0_wp ! due to averaging (see above)
834	ENDIF
835
836	!
837	!-- Graphic output for time series
838	IF ( time_dots >= dt_dots ) THEN
839	CALL data_output_tseries
840	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
841	ENDIF
842
843	!
844	!-- Output of spectra (formatted for use with PROFIL), in case of no
845	!-- time averaging, spectra has to be calculated before
846	IF ( time_dosp >= dt_dosp ) THEN
847	IF ( average_count_sp == 0 ) CALL calc_spectra
848	CALL data_output_spectra
849	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
850	ENDIF
851
852	!
853	!-- 2d-data output (cross-sections)
854	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
855	CALL data_output_2d( 'xy', 0 )
856	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
857	ENDIF
858	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
859	CALL data_output_2d( 'xz', 0 )
860	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
861	ENDIF
862	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
863	CALL data_output_2d( 'yz', 0 )
864	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
865	ENDIF
866
867	!
868	!-- 3d-data output (volume data)
869	IF ( time_do3d >= dt_do3d ) THEN
870	CALL data_output_3d( 0 )
871	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
872	ENDIF
873
874	!
875	!-- masked data output
876	!-- Parallel netcdf output is not tested so far for masked data, hence
877	!-- netcdf_data_format is switched back to non-paralell output.
878	netcdf_data_format_save = netcdf_data_format
879	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
880	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
881	DO mid = 1, masks
882	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
883	CALL data_output_mask( 0 )
884	time_domask(mid) = MOD( time_domask(mid), &
885	MAX( dt_domask(mid), dt_3d ) )
886	ENDIF
887	ENDDO
888	netcdf_data_format = netcdf_data_format_save
889
890	!
891	!-- Output of time-averaged 2d/3d/masked data
892	IF ( time_do_av >= dt_data_output_av ) THEN
893	CALL average_3d_data
894	CALL data_output_2d( 'xy', 1 )
895	CALL data_output_2d( 'xz', 1 )
896	CALL data_output_2d( 'yz', 1 )
897	CALL data_output_3d( 1 )
898	!-- Parallel netcdf output is not tested so far for masked data, hence
899	!-- netcdf_data_format is switched back to non-paralell output.
900	netcdf_data_format_save = netcdf_data_format
901	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
902	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
903	DO mid = 1, masks
904	CALL data_output_mask( 1 )
905	ENDDO
906	netcdf_data_format = netcdf_data_format_save
907	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
908	ENDIF
909
910	!
911	!-- Output of particle time series
912	IF ( particle_advection ) THEN
913	IF ( time_dopts >= dt_dopts .OR. &
914	( simulated_time >= particle_advection_start .AND. &
915	first_call_lpm ) ) THEN
916	CALL data_output_ptseries
917	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
918	ENDIF
919	ENDIF
920
921	!
922	!-- Output of dvrp-graphics (isosurface, particles, slicer)
923	#if defined( __dvrp_graphics )
924	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
925	#endif
926	IF ( time_dvrp >= dt_dvrp ) THEN
927	CALL data_output_dvrp
928	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
929	ENDIF
930	#if defined( __dvrp_graphics )
931	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
932	#endif
933
934	!
935	!-- If required, set the heat flux for the next time step at a random value
936	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
937
938	!
939	!-- Execute user-defined actions
940	CALL user_actions( 'after_timestep' )
941
942	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
943
944
945	ENDDO ! time loop
946
947	#if defined( __dvrp_graphics )
948	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
949	#endif
950
951	END SUBROUTINE time_integration

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