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source: palm/trunk/SOURCE/time_integration.f90 @ 1395

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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 1385 2014-05-02 14:39:33Z keck $
27	!
28	! 1384 2014-05-02 14:31:06Z raasch
29	! location messages added
30	!
31	! 1380 2014-04-28 12:40:45Z heinze
32	! CALL of nudge_ref added
33	! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
34	!
35	! 1365 2014-04-22 15:03:56Z boeske
36	! Reset sums_ls_l to zero at each timestep
37	! +sums_ls_l
38	! Calculation of reference state (previously in subroutine calc_mean_profile)
39
40	! 1342 2014-03-26 17:04:47Z kanani
41	! REAL constants defined as wp-kind
42	!
43	! 1320 2014-03-20 08:40:49Z raasch
44	! ONLY-attribute added to USE-statements,
45	! kind-parameters added to all INTEGER and REAL declaration statements,
46	! kinds are defined in new module kinds,
47	! old module precision_kind is removed,
48	! revision history before 2012 removed,
49	! comment fields (!:) to be used for variable explanations added to
50	! all variable declaration statements
51	! 1318 2014-03-17 13:35:16Z raasch
52	! module interfaces removed
53	!
54	! 1308 2014-03-13 14:58:42Z fricke
55	! +netcdf_data_format_save
56	! For masked data, parallel netcdf output is not tested so far, hence
57	! netcdf_data_format is switched back to non-paralell output.
58	!
59	! 1276 2014-01-15 13:40:41Z heinze
60	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
61	!
62	! 1257 2013-11-08 15:18:40Z raasch
63	! acc-update-host directive for timestep removed
64	!
65	! 1241 2013-10-30 11:36:58Z heinze
66	! Generalize calc_mean_profile for wider use
67	! Determine shf and qsws in dependence on data from LSF_DATA
68	! Determine ug and vg in dependence on data from LSF_DATA
69	! 1221 2013-09-10 08:59:13Z raasch
70	! host update of arrays before timestep is called
71	!
72	! 1179 2013-06-14 05:57:58Z raasch
73	! mean profiles for reference state are only calculated if required,
74	! small bugfix for background communication
75	!
76	! 1171 2013-05-30 11:27:45Z raasch
77	! split of prognostic_equations deactivated (comment lines), for the time being
78	!
79	! 1128 2013-04-12 06:19:32Z raasch
80	! asynchronous transfer of ghost point data realized for acc-optimized version:
81	! prognostic_equations are first called two times for those points required for
82	! the left-right and north-south exchange, respectively, and then for the
83	! remaining points,
84	! those parts requiring global communication moved from prognostic_equations to
85	! here
86	!
87	! 1115 2013-03-26 18:16:16Z hoffmann
88	! calculation of qr and nr is restricted to precipitation
89	!
90	! 1113 2013-03-10 02:48:14Z raasch
91	! GPU-porting of boundary conditions,
92	! openACC directives updated
93	! formal parameter removed from routine boundary_conds
94	!
95	! 1111 2013-03-08 23:54:10Z raasch
96	! +internal timestep counter for cpu statistics added,
97	! openACC directives updated
98	!
99	! 1092 2013-02-02 11:24:22Z raasch
100	! unused variables removed
101	!
102	! 1065 2012-11-22 17:42:36Z hoffmann
103	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
104	!
105	! 1053 2012-11-13 17:11:03Z hoffmann
106	! exchange of ghost points for nr, qr added
107	!
108	! 1036 2012-10-22 13:43:42Z raasch
109	! code put under GPL (PALM 3.9)
110	!
111	! 1019 2012-09-28 06:46:45Z raasch
112	! non-optimized version of prognostic_equations removed
113	!
114	! 1015 2012-09-27 09:23:24Z raasch
115	! +call of prognostic_equations_acc
116	!
117	! 1001 2012-09-13 14:08:46Z raasch
118	! all actions concerning leapfrog- and upstream-spline-scheme removed
119	!
120	! 849 2012-03-15 10:35:09Z raasch
121	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
122	!
123	! 825 2012-02-19 03:03:44Z raasch
124	! wang_collision_kernel renamed wang_kernel
125	!
126	! Revision 1.1 1997/08/11 06:19:04 raasch
127	! Initial revision
128	!
129	!
130	! Description:
131	! ------------
132	! Integration in time of the model equations, statistical analysis and graphic
133	! output
134	!------------------------------------------------------------------------------!
135
136	USE advec_ws, &
137	ONLY: ws_statistics
138
139	USE arrays_3d, &
140	ONLY: diss, dzu, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q, ql, &
141	ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend, u, &
142	u_p, v, vpt, v_p, w_p
143
144	USE calc_mean_profile_mod, &
145	ONLY: calc_mean_profile
146
147	USE control_parameters, &
148	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
149	average_count_sp, averaging_interval, averaging_interval_pr, &
150	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, &
151	bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets, &
152	cloud_physics, constant_heatflux, create_disturbances, dopr_n, &
153	constant_diffusion, coupling_mode, coupling_start_time, &
154	current_timestep_number, disturbance_created, &
155	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
156	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
157	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
158	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
159	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
160	end_time, first_call_lpm, galilei_transformation, humidity, &
161	icloud_scheme, intermediate_timestep_count, &
162	intermediate_timestep_count_max, large_scale_forcing, &
163	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
164	netcdf_data_format, neutral, nr_timesteps_this_run, nudging, &
165	ocean, on_device, passive_scalar, prandtl_layer, precipitation, &
166	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
167	run_coupled, simulated_time, simulated_time_chr, &
168	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
169	skip_time_do3d, skip_time_domask, skip_time_dopr, &
170	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
171	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
172	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
173	time_do3d, time_domask, time_dopr, time_dopr_av, &
174	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
175	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
176	time_run_control, time_since_reference_point, turbulence, &
177	turbulent_inflow, use_initial_profile_as_reference, &
178	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
179	ws_scheme_sca
180
181	USE cpulog, &
182	ONLY: cpu_log, log_point, log_point_s
183
184	USE indices, &
185	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
186	nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
187
188	USE interaction_droplets_ptq_mod, &
189	ONLY: interaction_droplets_ptq
190
191	USE kinds
192
193	USE ls_forcing_mod, &
194	ONLY: ls_forcing_surf, ls_forcing_vert
195
196	USE nudge_mod, &
197	ONLY: calc_tnudge, nudge_ref
198
199	USE particle_attributes, &
200	ONLY: particle_advection, particle_advection_start, wang_kernel
201
202	USE pegrid
203
204	USE production_e_mod, &
205	ONLY: production_e_init
206
207	USE prognostic_equations_mod, &
208	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
209	prognostic_equations_vector
210
211	USE statistics, &
212	ONLY: flow_statistics_called, hom, pr_palm, sums_ls_l
213
214	USE user_actions_mod, &
215	ONLY: user_actions
216
217	IMPLICIT NONE
218
219	CHARACTER (LEN=9) :: time_to_string !:
220
221	INTEGER(iwp) :: netcdf_data_format_save !:
222
223	!
224	!-- At the beginning of a simulation determine the time step as well as
225	!-- determine and print out the run control parameters
226	IF ( simulated_time == 0.0_wp ) CALL timestep
227
228	CALL run_control
229
230
231	!
232	!-- Data exchange between coupled models in case that a call has been omitted
233	!-- at the end of the previous run of a job chain.
234	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
235	!
236	!-- In case of model termination initiated by the local model the coupler
237	!-- must not be called because this would again cause an MPI hang.
238	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
239	CALL surface_coupler
240	time_coupling = time_coupling - dt_coupling
241	ENDDO
242	IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
243	THEN
244	time_coupling = time_since_reference_point
245	ENDIF
246	ENDIF
247
248
249	#if defined( __dvrp_graphics )
250	!
251	!-- Time measurement with dvrp software
252	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
253	#endif
254
255	CALL location_message( 'beginning with time-stepping' )
256	!
257	!-- Start of the time loop
258	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
259	.NOT. terminate_run )
260
261	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
262
263	!
264	!-- Determine size of next time step
265	IF ( simulated_time /= 0.0_wp ) THEN
266	CALL timestep
267	ENDIF
268
269	!
270	!-- Determine ug, vg and w_subs in dependence on data from external file
271	!-- LSF_DATA
272	IF ( large_scale_forcing .AND. lsf_vert ) THEN
273	CALL ls_forcing_vert ( simulated_time )
274	sums_ls_l = 0.0_wp
275	ENDIF
276
277	!
278	!-- Set pt_init and q_init to the current profiles taken from
279	!-- NUDGING_DATA
280	IF ( nudging ) THEN
281	CALL nudge_ref ( simulated_time )
282	!
283	!-- Store temperature gradient at the top boundary for possible Neumann
284	!-- boundary condition
285	bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
286	bc_q_t_val = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
287	ENDIF
288
289	!
290	!-- Execute the user-defined actions
291	CALL user_actions( 'before_timestep' )
292
293	!
294	!-- Start of intermediate step loop
295	intermediate_timestep_count = 0
296	DO WHILE ( intermediate_timestep_count < &
297	intermediate_timestep_count_max )
298
299	intermediate_timestep_count = intermediate_timestep_count + 1
300
301	!
302	!-- Set the steering factors for the prognostic equations which depend
303	!-- on the timestep scheme
304	CALL timestep_scheme_steering
305
306	!
307	!-- Calculate those variables needed in the tendency terms which need
308	!-- global communication
309	IF ( .NOT. use_single_reference_value .AND. &
310	.NOT. use_initial_profile_as_reference ) THEN
311	!
312	!-- Horizontally averaged profiles to be used as reference state in
313	!-- buoyancy terms (WARNING: only the respective last call of
314	!-- calc_mean_profile defines the reference state!)
315	IF ( .NOT. neutral ) THEN
316	CALL calc_mean_profile( pt, 4 )
317	ref_state(:) = hom(:,1,4,0) ! this is used in the buoyancy term
318	ENDIF
319	IF ( ocean ) THEN
320	CALL calc_mean_profile( rho, 64 )
321	ref_state(:) = hom(:,1,64,0)
322	ENDIF
323	IF ( humidity ) THEN
324	CALL calc_mean_profile( vpt, 44 )
325	ref_state(:) = hom(:,1,44,0)
326	ENDIF
327
328	ENDIF
329
330	IF ( .NOT. constant_diffusion ) CALL production_e_init
331	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
332	intermediate_timestep_count == 1 ) CALL ws_statistics
333	!
334	!-- In case of nudging calculate current nudging time scale and horizontal
335	!-- means of u, v, pt and q
336	IF ( nudging ) THEN
337	CALL calc_tnudge( simulated_time )
338	CALL calc_mean_profile( u, 1 )
339	CALL calc_mean_profile( v, 2 )
340	CALL calc_mean_profile( pt, 4 )
341	CALL calc_mean_profile( q, 41 )
342	ENDIF
343
344	!
345	!-- Solve the prognostic equations. A fast cache optimized version with
346	!-- only one single loop is used in case of Piascek-Williams advection
347	!-- scheme. NEC vector machines use a different version, because
348	!-- in the other versions a good vectorization is prohibited due to
349	!-- inlining problems.
350	IF ( loop_optimization == 'cache' ) THEN
351	CALL prognostic_equations_cache
352	ELSEIF ( loop_optimization == 'vector' ) THEN
353	CALL prognostic_equations_vector
354	ELSEIF ( loop_optimization == 'acc' ) THEN
355	i_left = nxl; i_right = nxr
356	j_south = nys; j_north = nyn
357	CALL prognostic_equations_acc
358
359	! i_left = nxl; i_right = nxl+nbgp-1
360	! j_south = nys; j_north = nyn
361	! CALL prognostic_equations_acc
362	! i_left = nxr-nbgp+1; i_right = nxr
363	! j_south = nys; j_north = nyn
364	! CALL prognostic_equations_acc
365
366	!
367	!-- Exchange of ghost points (lateral boundary conditions)
368	IF ( background_communication ) THEN
369
370	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
371
372	send_receive = 'lr'
373	sendrecv_in_background = .TRUE.
374	req = 0
375	req_count = 0
376
377	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
378	on_device = .TRUE. ! to be removed after complete porting
379	ELSE ! of ghost point exchange
380	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
381	ENDIF
382
383	CALL exchange_horiz( u_p, nbgp )
384	CALL exchange_horiz( v_p, nbgp )
385	CALL exchange_horiz( w_p, nbgp )
386	CALL exchange_horiz( pt_p, nbgp )
387	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
388	IF ( ocean ) THEN
389	CALL exchange_horiz( sa_p, nbgp )
390	CALL exchange_horiz( rho, nbgp )
391	CALL exchange_horiz( prho, nbgp )
392	ENDIF
393	IF (humidity .OR. passive_scalar) THEN
394	CALL exchange_horiz( q_p, nbgp )
395	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
396	CALL exchange_horiz( qr_p, nbgp )
397	CALL exchange_horiz( nr_p, nbgp )
398	ENDIF
399	ENDIF
400	IF ( cloud_droplets ) THEN
401	CALL exchange_horiz( ql, nbgp )
402	CALL exchange_horiz( ql_c, nbgp )
403	CALL exchange_horiz( ql_v, nbgp )
404	CALL exchange_horiz( ql_vp, nbgp )
405	ENDIF
406	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
407
408	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
409	on_device = .FALSE. ! to be removed after complete porting
410	ELSE ! of ghost point exchange
411	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
412	ENDIF
413
414	sendrecv_in_background = .FALSE.
415
416	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
417
418	ENDIF
419
420	! i_left = nxl+nbgp; i_right = nxr-nbgp
421	! j_south = nys; j_north = nys+nbgp-1
422	! CALL prognostic_equations_acc
423	! i_left = nxl+nbgp; i_right = nxr-nbgp
424	! j_south = nyn-nbgp+1; j_north = nyn
425	! CALL prognostic_equations_acc
426
427	IF ( background_communication ) THEN
428	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
429	#if defined( __parallel )
430	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
431	#endif
432	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
433
434	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
435
436	send_receive = 'ns'
437	sendrecv_in_background = .TRUE.
438	req = 0
439	req_count = 0
440
441	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
442	on_device = .TRUE. ! to be removed after complete porting
443	ELSE ! of ghost point exchange
444	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
445	ENDIF
446
447	CALL exchange_horiz( u_p, nbgp )
448	CALL exchange_horiz( v_p, nbgp )
449	CALL exchange_horiz( w_p, nbgp )
450	CALL exchange_horiz( pt_p, nbgp )
451	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
452	IF ( ocean ) THEN
453	CALL exchange_horiz( sa_p, nbgp )
454	CALL exchange_horiz( rho, nbgp )
455	CALL exchange_horiz( prho, nbgp )
456	ENDIF
457	IF (humidity .OR. passive_scalar) THEN
458	CALL exchange_horiz( q_p, nbgp )
459	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
460	CALL exchange_horiz( qr_p, nbgp )
461	CALL exchange_horiz( nr_p, nbgp )
462	ENDIF
463	ENDIF
464	IF ( cloud_droplets ) THEN
465	CALL exchange_horiz( ql, nbgp )
466	CALL exchange_horiz( ql_c, nbgp )
467	CALL exchange_horiz( ql_v, nbgp )
468	CALL exchange_horiz( ql_vp, nbgp )
469	ENDIF
470	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
471
472	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
473	on_device = .FALSE. ! to be removed after complete porting
474	ELSE ! of ghost point exchange
475	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
476	ENDIF
477
478	sendrecv_in_background = .FALSE.
479
480	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
481
482	ENDIF
483
484	! i_left = nxl+nbgp; i_right = nxr-nbgp
485	! j_south = nys+nbgp; j_north = nyn-nbgp
486	! CALL prognostic_equations_acc
487
488	IF ( background_communication ) THEN
489	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
490	#if defined( __parallel )
491	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
492	#endif
493	send_receive = 'al'
494	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
495	ENDIF
496
497	ENDIF
498
499	!
500	!-- Particle transport/physics with the Lagrangian particle model
501	!-- (only once during intermediate steps, because it uses an Euler-step)
502	!-- ### particle model should be moved before prognostic_equations, in order
503	!-- to regard droplet interactions directly
504	IF ( particle_advection .AND. &
505	simulated_time >= particle_advection_start .AND. &
506	intermediate_timestep_count == 1 ) THEN
507	CALL lpm
508	first_call_lpm = .FALSE.
509	ENDIF
510
511	!
512	!-- Interaction of droplets with temperature and specific humidity.
513	!-- Droplet condensation and evaporation is calculated within
514	!-- advec_particles.
515	IF ( cloud_droplets .AND. &
516	intermediate_timestep_count == intermediate_timestep_count_max )&
517	THEN
518	CALL interaction_droplets_ptq
519	ENDIF
520
521	!
522	!-- Exchange of ghost points (lateral boundary conditions)
523	IF ( .NOT. background_communication ) THEN
524
525	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
526
527	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
528	on_device = .TRUE. ! to be removed after complete porting
529	ELSE ! of ghost point exchange
530	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
531	ENDIF
532
533	CALL exchange_horiz( u_p, nbgp )
534	CALL exchange_horiz( v_p, nbgp )
535	CALL exchange_horiz( w_p, nbgp )
536	CALL exchange_horiz( pt_p, nbgp )
537	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
538	IF ( ocean ) THEN
539	CALL exchange_horiz( sa_p, nbgp )
540	CALL exchange_horiz( rho, nbgp )
541	CALL exchange_horiz( prho, nbgp )
542	ENDIF
543	IF (humidity .OR. passive_scalar) THEN
544	CALL exchange_horiz( q_p, nbgp )
545	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
546	precipitation ) THEN
547	CALL exchange_horiz( qr_p, nbgp )
548	CALL exchange_horiz( nr_p, nbgp )
549	ENDIF
550	ENDIF
551	IF ( cloud_droplets ) THEN
552	CALL exchange_horiz( ql, nbgp )
553	CALL exchange_horiz( ql_c, nbgp )
554	CALL exchange_horiz( ql_v, nbgp )
555	CALL exchange_horiz( ql_vp, nbgp )
556	ENDIF
557	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
558
559	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
560	on_device = .FALSE. ! to be removed after complete porting
561	ELSE ! of ghost point exchange
562	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
563	ENDIF
564
565	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
566
567	ENDIF
568
569	!
570	!-- Boundary conditions for the prognostic quantities (except of the
571	!-- velocities at the outflow in case of a non-cyclic lateral wall)
572	CALL boundary_conds
573
574	!
575	!-- Swap the time levels in preparation for the next time step.
576	CALL swap_timelevel
577
578	!
579	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
580	!-- when a sloping surface is used
581	IF ( sloping_surface ) THEN
582	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
583	pt_slope_offset
584	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
585	pt_slope_offset
586	ENDIF
587
588	!
589	!-- Impose a turbulent inflow using the recycling method
590	IF ( turbulent_inflow ) CALL inflow_turbulence
591
592	!
593	!-- Impose a random perturbation on the horizontal velocity field
594	IF ( create_disturbances .AND. &
595	( call_psolver_at_all_substeps .AND. &
596	intermediate_timestep_count == intermediate_timestep_count_max )&
597	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
598	intermediate_timestep_count == 1 ) ) &
599	THEN
600	time_disturb = time_disturb + dt_3d
601	IF ( time_disturb >= dt_disturb ) THEN
602	!$acc update host( u, v )
603	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
604	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
605	CALL disturb_field( nzb_u_inner, tend, u )
606	CALL disturb_field( nzb_v_inner, tend, v )
607	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
608	!
609	!-- Runs with a non-cyclic lateral wall need perturbations
610	!-- near the inflow throughout the whole simulation
611	dist_range = 1
612	CALL disturb_field( nzb_u_inner, tend, u )
613	CALL disturb_field( nzb_v_inner, tend, v )
614	dist_range = 0
615	ENDIF
616	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
617	!$acc update device( u, v )
618	time_disturb = time_disturb - dt_disturb
619	ENDIF
620	ENDIF
621
622	!
623	!-- Reduce the velocity divergence via the equation for perturbation
624	!-- pressure.
625	IF ( intermediate_timestep_count == 1 .OR. &
626	call_psolver_at_all_substeps ) THEN
627	CALL pres
628	ENDIF
629
630	!
631	!-- If required, compute liquid water content
632	IF ( cloud_physics ) THEN
633	CALL calc_liquid_water_content
634	!$acc update device( ql )
635	ENDIF
636	!
637	!-- If required, compute virtual potential temperature
638	IF ( humidity ) THEN
639	CALL compute_vpt
640	!$acc update device( vpt )
641	ENDIF
642	!
643	!-- Compute the diffusion quantities
644	IF ( .NOT. constant_diffusion ) THEN
645
646	!
647	!-- Determine surface fluxes shf and qsws and surface values
648	!-- pt_surface and q_surface in dependence on data from external
649	!-- file LSF_DATA respectively
650	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
651	intermediate_timestep_count == intermediate_timestep_count_max )&
652	THEN
653	CALL ls_forcing_surf ( simulated_time )
654	ENDIF
655
656	!
657	!-- First the vertical fluxes in the Prandtl layer are being computed
658	IF ( prandtl_layer ) THEN
659	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
660	CALL prandtl_fluxes
661	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
662	ENDIF
663
664	!
665	!-- Compute the diffusion coefficients
666	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
667	IF ( .NOT. humidity ) THEN
668	IF ( ocean ) THEN
669	CALL diffusivities( prho, prho_reference )
670	ELSE
671	CALL diffusivities( pt, pt_reference )
672	ENDIF
673	ELSE
674	CALL diffusivities( vpt, pt_reference )
675	ENDIF
676	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
677
678	ENDIF
679
680	ENDDO ! Intermediate step loop
681
682	!
683	!-- Increase simulation time and output times
684	nr_timesteps_this_run = nr_timesteps_this_run + 1
685	current_timestep_number = current_timestep_number + 1
686	simulated_time = simulated_time + dt_3d
687	simulated_time_chr = time_to_string( simulated_time )
688	time_since_reference_point = simulated_time - coupling_start_time
689
690	IF ( simulated_time >= skip_time_data_output_av ) THEN
691	time_do_av = time_do_av + dt_3d
692	ENDIF
693	IF ( simulated_time >= skip_time_do2d_xy ) THEN
694	time_do2d_xy = time_do2d_xy + dt_3d
695	ENDIF
696	IF ( simulated_time >= skip_time_do2d_xz ) THEN
697	time_do2d_xz = time_do2d_xz + dt_3d
698	ENDIF
699	IF ( simulated_time >= skip_time_do2d_yz ) THEN
700	time_do2d_yz = time_do2d_yz + dt_3d
701	ENDIF
702	IF ( simulated_time >= skip_time_do3d ) THEN
703	time_do3d = time_do3d + dt_3d
704	ENDIF
705	DO mid = 1, masks
706	IF ( simulated_time >= skip_time_domask(mid) ) THEN
707	time_domask(mid)= time_domask(mid) + dt_3d
708	ENDIF
709	ENDDO
710	time_dvrp = time_dvrp + dt_3d
711	IF ( simulated_time >= skip_time_dosp ) THEN
712	time_dosp = time_dosp + dt_3d
713	ENDIF
714	time_dots = time_dots + dt_3d
715	IF ( .NOT. first_call_lpm ) THEN
716	time_dopts = time_dopts + dt_3d
717	ENDIF
718	IF ( simulated_time >= skip_time_dopr ) THEN
719	time_dopr = time_dopr + dt_3d
720	ENDIF
721	time_dopr_listing = time_dopr_listing + dt_3d
722	time_run_control = time_run_control + dt_3d
723
724	!
725	!-- Data exchange between coupled models
726	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
727	time_coupling = time_coupling + dt_3d
728
729	!
730	!-- In case of model termination initiated by the local model
731	!-- (terminate_coupled > 0), the coupler must be skipped because it would
732	!-- cause an MPI intercomminucation hang.
733	!-- If necessary, the coupler will be called at the beginning of the
734	!-- next restart run.
735	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
736	CALL surface_coupler
737	time_coupling = time_coupling - dt_coupling
738	ENDDO
739	ENDIF
740
741	!
742	!-- Execute user-defined actions
743	CALL user_actions( 'after_integration' )
744
745	!
746	!-- If Galilei transformation is used, determine the distance that the
747	!-- model has moved so far
748	IF ( galilei_transformation ) THEN
749	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
750	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
751	ENDIF
752
753	!
754	!-- Check, if restart is necessary (because cpu-time is expiring or
755	!-- because it is forced by user) and set stop flag
756	!-- This call is skipped if the remote model has already initiated a restart.
757	IF ( .NOT. terminate_run ) CALL check_for_restart
758
759	!
760	!-- Carry out statistical analysis and output at the requested output times.
761	!-- The MOD function is used for calculating the output time counters (like
762	!-- time_dopr) in order to regard a possible decrease of the output time
763	!-- interval in case of restart runs
764
765	!
766	!-- Set a flag indicating that so far no statistics have been created
767	!-- for this time step
768	flow_statistics_called = .FALSE.
769
770	!
771	!-- If required, call flow_statistics for averaging in time
772	IF ( averaging_interval_pr /= 0.0_wp .AND. &
773	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
774	simulated_time >= skip_time_dopr ) THEN
775	time_dopr_av = time_dopr_av + dt_3d
776	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
777	do_sum = .TRUE.
778	time_dopr_av = MOD( time_dopr_av, &
779	MAX( dt_averaging_input_pr, dt_3d ) )
780	ENDIF
781	ENDIF
782	IF ( do_sum ) CALL flow_statistics
783
784	!
785	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
786	IF ( averaging_interval /= 0.0_wp .AND. &
787	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
788	simulated_time >= skip_time_data_output_av ) &
789	THEN
790	time_do_sla = time_do_sla + dt_3d
791	IF ( time_do_sla >= dt_averaging_input ) THEN
792	CALL sum_up_3d_data
793	average_count_3d = average_count_3d + 1
794	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
795	ENDIF
796	ENDIF
797
798	!
799	!-- Calculate spectra for time averaging
800	IF ( averaging_interval_sp /= 0.0_wp .AND. &
801	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
802	simulated_time >= skip_time_dosp ) THEN
803	time_dosp_av = time_dosp_av + dt_3d
804	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
805	CALL calc_spectra
806	time_dosp_av = MOD( time_dosp_av, &
807	MAX( dt_averaging_input_pr, dt_3d ) )
808	ENDIF
809	ENDIF
810
811	!
812	!-- Computation and output of run control parameters.
813	!-- This is also done whenever perturbations have been imposed
814	IF ( time_run_control >= dt_run_control .OR. &
815	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
816	THEN
817	CALL run_control
818	IF ( time_run_control >= dt_run_control ) THEN
819	time_run_control = MOD( time_run_control, &
820	MAX( dt_run_control, dt_3d ) )
821	ENDIF
822	ENDIF
823
824	!
825	!-- Profile output (ASCII) on file
826	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
827	CALL print_1d
828	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
829	dt_3d ) )
830	ENDIF
831
832	!
833	!-- Graphic output for PROFIL
834	IF ( time_dopr >= dt_dopr ) THEN
835	IF ( dopr_n /= 0 ) CALL data_output_profiles
836	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
837	time_dopr_av = 0.0_wp ! due to averaging (see above)
838	ENDIF
839
840	!
841	!-- Graphic output for time series
842	IF ( time_dots >= dt_dots ) THEN
843	CALL data_output_tseries
844	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
845	ENDIF
846
847	!
848	!-- Output of spectra (formatted for use with PROFIL), in case of no
849	!-- time averaging, spectra has to be calculated before
850	IF ( time_dosp >= dt_dosp ) THEN
851	IF ( average_count_sp == 0 ) CALL calc_spectra
852	CALL data_output_spectra
853	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
854	ENDIF
855
856	!
857	!-- 2d-data output (cross-sections)
858	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
859	CALL data_output_2d( 'xy', 0 )
860	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
861	ENDIF
862	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
863	CALL data_output_2d( 'xz', 0 )
864	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
865	ENDIF
866	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
867	CALL data_output_2d( 'yz', 0 )
868	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
869	ENDIF
870
871	!
872	!-- 3d-data output (volume data)
873	IF ( time_do3d >= dt_do3d ) THEN
874	CALL data_output_3d( 0 )
875	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
876	ENDIF
877
878	!
879	!-- masked data output
880	!-- Parallel netcdf output is not tested so far for masked data, hence
881	!-- netcdf_data_format is switched back to non-paralell output.
882	netcdf_data_format_save = netcdf_data_format
883	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
884	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
885	DO mid = 1, masks
886	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
887	CALL data_output_mask( 0 )
888	time_domask(mid) = MOD( time_domask(mid), &
889	MAX( dt_domask(mid), dt_3d ) )
890	ENDIF
891	ENDDO
892	netcdf_data_format = netcdf_data_format_save
893
894	!
895	!-- Output of time-averaged 2d/3d/masked data
896	IF ( time_do_av >= dt_data_output_av ) THEN
897	CALL average_3d_data
898	CALL data_output_2d( 'xy', 1 )
899	CALL data_output_2d( 'xz', 1 )
900	CALL data_output_2d( 'yz', 1 )
901	CALL data_output_3d( 1 )
902	!-- Parallel netcdf output is not tested so far for masked data, hence
903	!-- netcdf_data_format is switched back to non-paralell output.
904	netcdf_data_format_save = netcdf_data_format
905	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
906	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
907	DO mid = 1, masks
908	CALL data_output_mask( 1 )
909	ENDDO
910	netcdf_data_format = netcdf_data_format_save
911	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
912	ENDIF
913
914	!
915	!-- Output of particle time series
916	IF ( particle_advection ) THEN
917	IF ( time_dopts >= dt_dopts .OR. &
918	( simulated_time >= particle_advection_start .AND. &
919	first_call_lpm ) ) THEN
920	CALL data_output_ptseries
921	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
922	ENDIF
923	ENDIF
924
925	!
926	!-- Output of dvrp-graphics (isosurface, particles, slicer)
927	#if defined( __dvrp_graphics )
928	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
929	#endif
930	IF ( time_dvrp >= dt_dvrp ) THEN
931	CALL data_output_dvrp
932	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
933	ENDIF
934	#if defined( __dvrp_graphics )
935	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
936	#endif
937
938	!
939	!-- If required, set the heat flux for the next time step at a random value
940	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
941
942	!
943	!-- Execute user-defined actions
944	CALL user_actions( 'after_timestep' )
945
946	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
947
948
949	ENDDO ! time loop
950
951	#if defined( __dvrp_graphics )
952	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
953	#endif
954
955	CALL location_message( 'finished time-stepping' )
956
957	END SUBROUTINE time_integration

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