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source: palm/trunk/SOURCE/time_integration.f90 @ 1384

Last change on this file since 1384 was 1384, checked in by raasch, 10 years ago
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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	! location messages added
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: time_integration.f90 1384 2014-05-02 14:31:06Z raasch $
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	CALL location_message( 'beginning with time-stepping' )
253	!
254	!-- Start of the time loop
255	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
256	.NOT. terminate_run )
257
258	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
259
260	!
261	!-- Determine size of next time step
262	IF ( simulated_time /= 0.0_wp ) THEN
263	CALL timestep
264	ENDIF
265
266	!
267	!-- Determine ug, vg and w_subs in dependence on data from external file
268	!-- LSF_DATA
269	IF ( large_scale_forcing .AND. lsf_vert ) THEN
270	CALL ls_forcing_vert ( simulated_time )
271	sums_ls_l = 0.0_wp
272	ENDIF
273
274	!
275	!-- Set pt_init and q_init to the current profiles taken from
276	!-- NUDGING_DATA
277	IF ( nudging ) THEN
278	CALL nudge_ref ( simulated_time )
279	!
280	!-- Store temperature gradient at the top boundary for possible Neumann
281	!-- boundary condition
282	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
283	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
284	ENDIF
285
286	!
287	!-- Execute the user-defined actions
288	CALL user_actions( 'before_timestep' )
289
290	!
291	!-- Start of intermediate step loop
292	intermediate_timestep_count = 0
293	DO WHILE ( intermediate_timestep_count < &
294	intermediate_timestep_count_max )
295
296	intermediate_timestep_count = intermediate_timestep_count + 1
297
298	!
299	!-- Set the steering factors for the prognostic equations which depend
300	!-- on the timestep scheme
301	CALL timestep_scheme_steering
302
303	!
304	!-- Calculate those variables needed in the tendency terms which need
305	!-- global communication
306	IF ( .NOT. use_single_reference_value .AND. &
307	.NOT. use_initial_profile_as_reference ) THEN
308	!
309	!-- Horizontally averaged profiles to be used as reference state in
310	!-- buoyancy terms (WARNING: only the respective last call of
311	!-- calc_mean_profile defines the reference state!)
312	IF ( .NOT. neutral ) THEN
313	CALL calc_mean_profile( pt, 4 )
314	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
315	ENDIF
316	IF ( ocean ) THEN
317	CALL calc_mean_profile( rho, 64 )
318	ref_state(:) = hom(:,1,64,0)
319	ENDIF
320	IF ( humidity ) THEN
321	CALL calc_mean_profile( vpt, 44 )
322	ref_state(:) = hom(:,1,44,0)
323	ENDIF
324
325	ENDIF
326
327	IF ( .NOT. constant_diffusion ) CALL production_e_init
328	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
329	intermediate_timestep_count == 1 ) CALL ws_statistics
330	!
331	!-- In case of nudging calculate current nudging time scale and horizontal
332	!-- means of u, v, pt and q
333	IF ( nudging ) THEN
334	CALL calc_tnudge( simulated_time )
335	CALL calc_mean_profile( u, 1 )
336	CALL calc_mean_profile( v, 2 )
337	CALL calc_mean_profile( pt, 4 )
338	CALL calc_mean_profile( q, 41 )
339	ENDIF
340
341	!
342	!-- Solve the prognostic equations. A fast cache optimized version with
343	!-- only one single loop is used in case of Piascek-Williams advection
344	!-- scheme. NEC vector machines use a different version, because
345	!-- in the other versions a good vectorization is prohibited due to
346	!-- inlining problems.
347	IF ( loop_optimization == 'cache' ) THEN
348	CALL prognostic_equations_cache
349	ELSEIF ( loop_optimization == 'vector' ) THEN
350	CALL prognostic_equations_vector
351	ELSEIF ( loop_optimization == 'acc' ) THEN
352	i_left = nxl; i_right = nxr
353	j_south = nys; j_north = nyn
354	CALL prognostic_equations_acc
355
356	! i_left = nxl; i_right = nxl+nbgp-1
357	! j_south = nys; j_north = nyn
358	! CALL prognostic_equations_acc
359	! i_left = nxr-nbgp+1; i_right = nxr
360	! j_south = nys; j_north = nyn
361	! CALL prognostic_equations_acc
362
363	!
364	!-- Exchange of ghost points (lateral boundary conditions)
365	IF ( background_communication ) THEN
366
367	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
368
369	send_receive = 'lr'
370	sendrecv_in_background = .TRUE.
371	req = 0
372	req_count = 0
373
374	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
375	on_device = .TRUE. ! to be removed after complete porting
376	ELSE ! of ghost point exchange
377	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
378	ENDIF
379
380	CALL exchange_horiz( u_p, nbgp )
381	CALL exchange_horiz( v_p, nbgp )
382	CALL exchange_horiz( w_p, nbgp )
383	CALL exchange_horiz( pt_p, nbgp )
384	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
385	IF ( ocean ) THEN
386	CALL exchange_horiz( sa_p, nbgp )
387	CALL exchange_horiz( rho, nbgp )
388	CALL exchange_horiz( prho, nbgp )
389	ENDIF
390	IF (humidity .OR. passive_scalar) THEN
391	CALL exchange_horiz( q_p, nbgp )
392	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
393	CALL exchange_horiz( qr_p, nbgp )
394	CALL exchange_horiz( nr_p, nbgp )
395	ENDIF
396	ENDIF
397	IF ( cloud_droplets ) THEN
398	CALL exchange_horiz( ql, nbgp )
399	CALL exchange_horiz( ql_c, nbgp )
400	CALL exchange_horiz( ql_v, nbgp )
401	CALL exchange_horiz( ql_vp, nbgp )
402	ENDIF
403	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
404
405	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
406	on_device = .FALSE. ! to be removed after complete porting
407	ELSE ! of ghost point exchange
408	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
409	ENDIF
410
411	sendrecv_in_background = .FALSE.
412
413	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
414
415	ENDIF
416
417	! i_left = nxl+nbgp; i_right = nxr-nbgp
418	! j_south = nys; j_north = nys+nbgp-1
419	! CALL prognostic_equations_acc
420	! i_left = nxl+nbgp; i_right = nxr-nbgp
421	! j_south = nyn-nbgp+1; j_north = nyn
422	! CALL prognostic_equations_acc
423
424	IF ( background_communication ) THEN
425	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
426	#if defined( __parallel )
427	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
428	#endif
429	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
430
431	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
432
433	send_receive = 'ns'
434	sendrecv_in_background = .TRUE.
435	req = 0
436	req_count = 0
437
438	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
439	on_device = .TRUE. ! to be removed after complete porting
440	ELSE ! of ghost point exchange
441	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
442	ENDIF
443
444	CALL exchange_horiz( u_p, nbgp )
445	CALL exchange_horiz( v_p, nbgp )
446	CALL exchange_horiz( w_p, nbgp )
447	CALL exchange_horiz( pt_p, nbgp )
448	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
449	IF ( ocean ) THEN
450	CALL exchange_horiz( sa_p, nbgp )
451	CALL exchange_horiz( rho, nbgp )
452	CALL exchange_horiz( prho, nbgp )
453	ENDIF
454	IF (humidity .OR. passive_scalar) THEN
455	CALL exchange_horiz( q_p, nbgp )
456	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
457	CALL exchange_horiz( qr_p, nbgp )
458	CALL exchange_horiz( nr_p, nbgp )
459	ENDIF
460	ENDIF
461	IF ( cloud_droplets ) THEN
462	CALL exchange_horiz( ql, nbgp )
463	CALL exchange_horiz( ql_c, nbgp )
464	CALL exchange_horiz( ql_v, nbgp )
465	CALL exchange_horiz( ql_vp, nbgp )
466	ENDIF
467	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
468
469	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
470	on_device = .FALSE. ! to be removed after complete porting
471	ELSE ! of ghost point exchange
472	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
473	ENDIF
474
475	sendrecv_in_background = .FALSE.
476
477	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
478
479	ENDIF
480
481	! i_left = nxl+nbgp; i_right = nxr-nbgp
482	! j_south = nys+nbgp; j_north = nyn-nbgp
483	! CALL prognostic_equations_acc
484
485	IF ( background_communication ) THEN
486	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
487	#if defined( __parallel )
488	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
489	#endif
490	send_receive = 'al'
491	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
492	ENDIF
493
494	ENDIF
495
496	!
497	!-- Particle transport/physics with the Lagrangian particle model
498	!-- (only once during intermediate steps, because it uses an Euler-step)
499	!-- ### particle model should be moved before prognostic_equations, in order
500	!-- to regard droplet interactions directly
501	IF ( particle_advection .AND. &
502	simulated_time >= particle_advection_start .AND. &
503	intermediate_timestep_count == 1 ) THEN
504	CALL lpm
505	first_call_lpm = .FALSE.
506	ENDIF
507
508	!
509	!-- Interaction of droplets with temperature and specific humidity.
510	!-- Droplet condensation and evaporation is calculated within
511	!-- advec_particles.
512	IF ( cloud_droplets .AND. &
513	intermediate_timestep_count == intermediate_timestep_count_max )&
514	THEN
515	CALL interaction_droplets_ptq
516	ENDIF
517
518	!
519	!-- Exchange of ghost points (lateral boundary conditions)
520	IF ( .NOT. background_communication ) THEN
521
522	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
523
524	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
525	on_device = .TRUE. ! to be removed after complete porting
526	ELSE ! of ghost point exchange
527	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
528	ENDIF
529
530	CALL exchange_horiz( u_p, nbgp )
531	CALL exchange_horiz( v_p, nbgp )
532	CALL exchange_horiz( w_p, nbgp )
533	CALL exchange_horiz( pt_p, nbgp )
534	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
535	IF ( ocean ) THEN
536	CALL exchange_horiz( sa_p, nbgp )
537	CALL exchange_horiz( rho, nbgp )
538	CALL exchange_horiz( prho, nbgp )
539	ENDIF
540	IF (humidity .OR. passive_scalar) THEN
541	CALL exchange_horiz( q_p, nbgp )
542	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
543	precipitation ) THEN
544	CALL exchange_horiz( qr_p, nbgp )
545	CALL exchange_horiz( nr_p, nbgp )
546	ENDIF
547	ENDIF
548	IF ( cloud_droplets ) THEN
549	CALL exchange_horiz( ql, nbgp )
550	CALL exchange_horiz( ql_c, nbgp )
551	CALL exchange_horiz( ql_v, nbgp )
552	CALL exchange_horiz( ql_vp, nbgp )
553	ENDIF
554	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
555
556	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
557	on_device = .FALSE. ! to be removed after complete porting
558	ELSE ! of ghost point exchange
559	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
560	ENDIF
561
562	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
563
564	ENDIF
565
566	!
567	!-- Boundary conditions for the prognostic quantities (except of the
568	!-- velocities at the outflow in case of a non-cyclic lateral wall)
569	CALL boundary_conds
570
571	!
572	!-- Swap the time levels in preparation for the next time step.
573	CALL swap_timelevel
574
575	!
576	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
577	!-- when a sloping surface is used
578	IF ( sloping_surface ) THEN
579	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
580	pt_slope_offset
581	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
582	pt_slope_offset
583	ENDIF
584
585	!
586	!-- Impose a turbulent inflow using the recycling method
587	IF ( turbulent_inflow ) CALL inflow_turbulence
588
589	!
590	!-- Impose a random perturbation on the horizontal velocity field
591	IF ( create_disturbances .AND. &
592	( call_psolver_at_all_substeps .AND. &
593	intermediate_timestep_count == intermediate_timestep_count_max )&
594	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
595	intermediate_timestep_count == 1 ) ) &
596	THEN
597	time_disturb = time_disturb + dt_3d
598	IF ( time_disturb >= dt_disturb ) THEN
599	!$acc update host( u, v )
600	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
601	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
602	CALL disturb_field( nzb_u_inner, tend, u )
603	CALL disturb_field( nzb_v_inner, tend, v )
604	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
605	!
606	!-- Runs with a non-cyclic lateral wall need perturbations
607	!-- near the inflow throughout the whole simulation
608	dist_range = 1
609	CALL disturb_field( nzb_u_inner, tend, u )
610	CALL disturb_field( nzb_v_inner, tend, v )
611	dist_range = 0
612	ENDIF
613	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
614	!$acc update device( u, v )
615	time_disturb = time_disturb - dt_disturb
616	ENDIF
617	ENDIF
618
619	!
620	!-- Reduce the velocity divergence via the equation for perturbation
621	!-- pressure.
622	IF ( intermediate_timestep_count == 1 .OR. &
623	call_psolver_at_all_substeps ) THEN
624	CALL pres
625	ENDIF
626
627	!
628	!-- If required, compute liquid water content
629	IF ( cloud_physics ) THEN
630	CALL calc_liquid_water_content
631	!$acc update device( ql )
632	ENDIF
633	!
634	!-- If required, compute virtual potential temperature
635	IF ( humidity ) THEN
636	CALL compute_vpt
637	!$acc update device( vpt )
638	ENDIF
639	!
640	!-- Compute the diffusion quantities
641	IF ( .NOT. constant_diffusion ) THEN
642
643	!
644	!-- Determine surface fluxes shf and qsws and surface values
645	!-- pt_surface and q_surface in dependence on data from external
646	!-- file LSF_DATA respectively
647	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
648	intermediate_timestep_count == intermediate_timestep_count_max )&
649	THEN
650	CALL ls_forcing_surf ( simulated_time )
651	ENDIF
652
653	!
654	!-- First the vertical fluxes in the Prandtl layer are being computed
655	IF ( prandtl_layer ) THEN
656	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
657	CALL prandtl_fluxes
658	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
659	ENDIF
660
661	!
662	!-- Compute the diffusion coefficients
663	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
664	IF ( .NOT. humidity ) THEN
665	IF ( ocean ) THEN
666	CALL diffusivities( prho, prho_reference )
667	ELSE
668	CALL diffusivities( pt, pt_reference )
669	ENDIF
670	ELSE
671	CALL diffusivities( vpt, pt_reference )
672	ENDIF
673	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
674
675	ENDIF
676
677	ENDDO ! Intermediate step loop
678
679	!
680	!-- Increase simulation time and output times
681	nr_timesteps_this_run = nr_timesteps_this_run + 1
682	current_timestep_number = current_timestep_number + 1
683	simulated_time = simulated_time + dt_3d
684	simulated_time_chr = time_to_string( simulated_time )
685	time_since_reference_point = simulated_time - coupling_start_time
686
687	IF ( simulated_time >= skip_time_data_output_av ) THEN
688	time_do_av = time_do_av + dt_3d
689	ENDIF
690	IF ( simulated_time >= skip_time_do2d_xy ) THEN
691	time_do2d_xy = time_do2d_xy + dt_3d
692	ENDIF
693	IF ( simulated_time >= skip_time_do2d_xz ) THEN
694	time_do2d_xz = time_do2d_xz + dt_3d
695	ENDIF
696	IF ( simulated_time >= skip_time_do2d_yz ) THEN
697	time_do2d_yz = time_do2d_yz + dt_3d
698	ENDIF
699	IF ( simulated_time >= skip_time_do3d ) THEN
700	time_do3d = time_do3d + dt_3d
701	ENDIF
702	DO mid = 1, masks
703	IF ( simulated_time >= skip_time_domask(mid) ) THEN
704	time_domask(mid)= time_domask(mid) + dt_3d
705	ENDIF
706	ENDDO
707	time_dvrp = time_dvrp + dt_3d
708	IF ( simulated_time >= skip_time_dosp ) THEN
709	time_dosp = time_dosp + dt_3d
710	ENDIF
711	time_dots = time_dots + dt_3d
712	IF ( .NOT. first_call_lpm ) THEN
713	time_dopts = time_dopts + dt_3d
714	ENDIF
715	IF ( simulated_time >= skip_time_dopr ) THEN
716	time_dopr = time_dopr + dt_3d
717	ENDIF
718	time_dopr_listing = time_dopr_listing + dt_3d
719	time_run_control = time_run_control + dt_3d
720
721	!
722	!-- Data exchange between coupled models
723	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
724	time_coupling = time_coupling + dt_3d
725
726	!
727	!-- In case of model termination initiated by the local model
728	!-- (terminate_coupled > 0), the coupler must be skipped because it would
729	!-- cause an MPI intercomminucation hang.
730	!-- If necessary, the coupler will be called at the beginning of the
731	!-- next restart run.
732	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
733	CALL surface_coupler
734	time_coupling = time_coupling - dt_coupling
735	ENDDO
736	ENDIF
737
738	!
739	!-- Execute user-defined actions
740	CALL user_actions( 'after_integration' )
741
742	!
743	!-- If Galilei transformation is used, determine the distance that the
744	!-- model has moved so far
745	IF ( galilei_transformation ) THEN
746	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
747	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
748	ENDIF
749
750	!
751	!-- Check, if restart is necessary (because cpu-time is expiring or
752	!-- because it is forced by user) and set stop flag
753	!-- This call is skipped if the remote model has already initiated a restart.
754	IF ( .NOT. terminate_run ) CALL check_for_restart
755
756	!
757	!-- Carry out statistical analysis and output at the requested output times.
758	!-- The MOD function is used for calculating the output time counters (like
759	!-- time_dopr) in order to regard a possible decrease of the output time
760	!-- interval in case of restart runs
761
762	!
763	!-- Set a flag indicating that so far no statistics have been created
764	!-- for this time step
765	flow_statistics_called = .FALSE.
766
767	!
768	!-- If required, call flow_statistics for averaging in time
769	IF ( averaging_interval_pr /= 0.0_wp .AND. &
770	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
771	simulated_time >= skip_time_dopr ) THEN
772	time_dopr_av = time_dopr_av + dt_3d
773	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
774	do_sum = .TRUE.
775	time_dopr_av = MOD( time_dopr_av, &
776	MAX( dt_averaging_input_pr, dt_3d ) )
777	ENDIF
778	ENDIF
779	IF ( do_sum ) CALL flow_statistics
780
781	!
782	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
783	IF ( averaging_interval /= 0.0_wp .AND. &
784	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
785	simulated_time >= skip_time_data_output_av ) &
786	THEN
787	time_do_sla = time_do_sla + dt_3d
788	IF ( time_do_sla >= dt_averaging_input ) THEN
789	CALL sum_up_3d_data
790	average_count_3d = average_count_3d + 1
791	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
792	ENDIF
793	ENDIF
794
795	!
796	!-- Calculate spectra for time averaging
797	IF ( averaging_interval_sp /= 0.0_wp .AND. &
798	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
799	simulated_time >= skip_time_dosp ) THEN
800	time_dosp_av = time_dosp_av + dt_3d
801	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
802	CALL calc_spectra
803	time_dosp_av = MOD( time_dosp_av, &
804	MAX( dt_averaging_input_pr, dt_3d ) )
805	ENDIF
806	ENDIF
807
808	!
809	!-- Computation and output of run control parameters.
810	!-- This is also done whenever perturbations have been imposed
811	IF ( time_run_control >= dt_run_control .OR. &
812	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
813	THEN
814	CALL run_control
815	IF ( time_run_control >= dt_run_control ) THEN
816	time_run_control = MOD( time_run_control, &
817	MAX( dt_run_control, dt_3d ) )
818	ENDIF
819	ENDIF
820
821	!
822	!-- Profile output (ASCII) on file
823	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
824	CALL print_1d
825	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
826	dt_3d ) )
827	ENDIF
828
829	!
830	!-- Graphic output for PROFIL
831	IF ( time_dopr >= dt_dopr ) THEN
832	IF ( dopr_n /= 0 ) CALL data_output_profiles
833	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
834	time_dopr_av = 0.0_wp ! due to averaging (see above)
835	ENDIF
836
837	!
838	!-- Graphic output for time series
839	IF ( time_dots >= dt_dots ) THEN
840	CALL data_output_tseries
841	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
842	ENDIF
843
844	!
845	!-- Output of spectra (formatted for use with PROFIL), in case of no
846	!-- time averaging, spectra has to be calculated before
847	IF ( time_dosp >= dt_dosp ) THEN
848	IF ( average_count_sp == 0 ) CALL calc_spectra
849	CALL data_output_spectra
850	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
851	ENDIF
852
853	!
854	!-- 2d-data output (cross-sections)
855	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
856	CALL data_output_2d( 'xy', 0 )
857	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
858	ENDIF
859	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
860	CALL data_output_2d( 'xz', 0 )
861	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
862	ENDIF
863	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
864	CALL data_output_2d( 'yz', 0 )
865	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
866	ENDIF
867
868	!
869	!-- 3d-data output (volume data)
870	IF ( time_do3d >= dt_do3d ) THEN
871	CALL data_output_3d( 0 )
872	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
873	ENDIF
874
875	!
876	!-- masked data output
877	!-- Parallel netcdf output is not tested so far for masked data, hence
878	!-- netcdf_data_format is switched back to non-paralell output.
879	netcdf_data_format_save = netcdf_data_format
880	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
881	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
882	DO mid = 1, masks
883	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
884	CALL data_output_mask( 0 )
885	time_domask(mid) = MOD( time_domask(mid), &
886	MAX( dt_domask(mid), dt_3d ) )
887	ENDIF
888	ENDDO
889	netcdf_data_format = netcdf_data_format_save
890
891	!
892	!-- Output of time-averaged 2d/3d/masked data
893	IF ( time_do_av >= dt_data_output_av ) THEN
894	CALL average_3d_data
895	CALL data_output_2d( 'xy', 1 )
896	CALL data_output_2d( 'xz', 1 )
897	CALL data_output_2d( 'yz', 1 )
898	CALL data_output_3d( 1 )
899	!-- Parallel netcdf output is not tested so far for masked data, hence
900	!-- netcdf_data_format is switched back to non-paralell output.
901	netcdf_data_format_save = netcdf_data_format
902	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
903	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
904	DO mid = 1, masks
905	CALL data_output_mask( 1 )
906	ENDDO
907	netcdf_data_format = netcdf_data_format_save
908	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
909	ENDIF
910
911	!
912	!-- Output of particle time series
913	IF ( particle_advection ) THEN
914	IF ( time_dopts >= dt_dopts .OR. &
915	( simulated_time >= particle_advection_start .AND. &
916	first_call_lpm ) ) THEN
917	CALL data_output_ptseries
918	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
919	ENDIF
920	ENDIF
921
922	!
923	!-- Output of dvrp-graphics (isosurface, particles, slicer)
924	#if defined( __dvrp_graphics )
925	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
926	#endif
927	IF ( time_dvrp >= dt_dvrp ) THEN
928	CALL data_output_dvrp
929	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
930	ENDIF
931	#if defined( __dvrp_graphics )
932	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
933	#endif
934
935	!
936	!-- If required, set the heat flux for the next time step at a random value
937	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
938
939	!
940	!-- Execute user-defined actions
941	CALL user_actions( 'after_timestep' )
942
943	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
944
945
946	ENDDO ! time loop
947
948	#if defined( __dvrp_graphics )
949	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
950	#endif
951
952	CALL location_message( 'finished time-stepping' )
953
954	END SUBROUTINE time_integration

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