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source: palm/trunk/SOURCE/time_integration.f90 @ 1321

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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 1321 2014-03-20 09:40:40Z raasch $
27	!
28	! 1320 2014-03-20 08:40:49Z raasch
29	! ONLY-attribute added to USE-statements,
30	! kind-parameters added to all INTEGER and REAL declaration statements,
31	! kinds are defined in new module kinds,
32	! old module precision_kind is removed,
33	! revision history before 2012 removed,
34	! comment fields (!:) to be used for variable explanations added to
35	! all variable declaration statements
36	! 1318 2014-03-17 13:35:16Z raasch
37	! module interfaces removed
38	!
39	! 1308 2014-03-13 14:58:42Z fricke
40	! +netcdf_data_format_save
41	! For masked data, parallel netcdf output is not tested so far, hence
42	! netcdf_data_format is switched back to non-paralell output.
43	!
44	! 1276 2014-01-15 13:40:41Z heinze
45	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
46	!
47	! 1257 2013-11-08 15:18:40Z raasch
48	! acc-update-host directive for timestep removed
49	!
50	! 1241 2013-10-30 11:36:58Z heinze
51	! Generalize calc_mean_profile for wider use
52	! Determine shf and qsws in dependence on data from LSF_DATA
53	! Determine ug and vg in dependence on data from LSF_DATA
54	! 1221 2013-09-10 08:59:13Z raasch
55	! host update of arrays before timestep is called
56	!
57	! 1179 2013-06-14 05:57:58Z raasch
58	! mean profiles for reference state are only calculated if required,
59	! small bugfix for background communication
60	!
61	! 1171 2013-05-30 11:27:45Z raasch
62	! split of prognostic_equations deactivated (comment lines), for the time being
63	!
64	! 1128 2013-04-12 06:19:32Z raasch
65	! asynchronous transfer of ghost point data realized for acc-optimized version:
66	! prognostic_equations are first called two times for those points required for
67	! the left-right and north-south exchange, respectively, and then for the
68	! remaining points,
69	! those parts requiring global communication moved from prognostic_equations to
70	! here
71	!
72	! 1115 2013-03-26 18:16:16Z hoffmann
73	! calculation of qr and nr is restricted to precipitation
74	!
75	! 1113 2013-03-10 02:48:14Z raasch
76	! GPU-porting of boundary conditions,
77	! openACC directives updated
78	! formal parameter removed from routine boundary_conds
79	!
80	! 1111 2013-03-08 23:54:10Z raasch
81	! +internal timestep counter for cpu statistics added,
82	! openACC directives updated
83	!
84	! 1092 2013-02-02 11:24:22Z raasch
85	! unused variables removed
86	!
87	! 1065 2012-11-22 17:42:36Z hoffmann
88	! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
89	!
90	! 1053 2012-11-13 17:11:03Z hoffmann
91	! exchange of ghost points for nr, qr added
92	!
93	! 1036 2012-10-22 13:43:42Z raasch
94	! code put under GPL (PALM 3.9)
95	!
96	! 1019 2012-09-28 06:46:45Z raasch
97	! non-optimized version of prognostic_equations removed
98	!
99	! 1015 2012-09-27 09:23:24Z raasch
100	! +call of prognostic_equations_acc
101	!
102	! 1001 2012-09-13 14:08:46Z raasch
103	! all actions concerning leapfrog- and upstream-spline-scheme removed
104	!
105	! 849 2012-03-15 10:35:09Z raasch
106	! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
107	!
108	! 825 2012-02-19 03:03:44Z raasch
109	! wang_collision_kernel renamed wang_kernel
110	!
111	! Revision 1.1 1997/08/11 06:19:04 raasch
112	! Initial revision
113	!
114	!
115	! Description:
116	! ------------
117	! Integration in time of the model equations, statistical analysis and graphic
118	! output
119	!------------------------------------------------------------------------------!
120
121	USE advec_ws, &
122	ONLY: ws_statistics
123
124	USE arrays_3d, &
125	ONLY: diss, e_p, nr_p, prho, pt, pt_p, ql, ql_c, ql_v, ql_vp, qr_p, &
126	q_p, rho, sa_p, tend, u, u_p, v, vpt, v_p, w_p
127
128	USE buoyancy_mod, &
129	ONLY: calc_mean_profile
130
131	USE control_parameters, &
132	ONLY: advected_distance_x, advected_distance_y, average_count_3d, &
133	average_count_sp, averaging_interval, averaging_interval_pr, &
134	averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, &
135	call_psolver_at_all_substeps, cloud_droplets, cloud_physics, &
136	constant_heatflux, create_disturbances, dopr_n, &
137	constant_diffusion, coupling_mode, coupling_start_time, &
138	current_timestep_number, disturbance_created, &
139	disturbance_energy_limit, dist_range, do_sum, dt_3d, &
140	dt_averaging_input, dt_averaging_input_pr, dt_coupling, &
141	dt_data_output_av, dt_disturb, dt_do2d_xy, dt_do2d_xz, &
142	dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr, &
143	dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control, &
144	end_time, first_call_lpm, galilei_transformation, humidity, &
145	icloud_scheme, intermediate_timestep_count, &
146	intermediate_timestep_count_max, large_scale_forcing, &
147	loop_optimization, lsf_surf, lsf_vert, masks, mid, &
148	netcdf_data_format, neutral, nr_timesteps_this_run, ocean, &
149	on_device, passive_scalar, prandtl_layer, precipitation, &
150	prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
151	run_coupled, simulated_time, simulated_time_chr, &
152	skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz, &
153	skip_time_do3d, skip_time_domask, skip_time_dopr, &
154	skip_time_dosp, skip_time_data_output_av, sloping_surface, &
155	stop_dt, terminate_coupled, terminate_run, timestep_scheme, &
156	time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz, &
157	time_do3d, time_domask, time_dopr, time_dopr_av, &
158	time_dopr_listing, time_dopts, time_dosp, time_dosp_av, &
159	time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp, &
160	time_run_control, time_since_reference_point, turbulence, &
161	turbulent_inflow, use_initial_profile_as_reference, &
162	use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom, &
163	ws_scheme_sca
164
165	USE cpulog, &
166	ONLY: cpu_log, log_point, log_point_s
167
168	USE indices, &
169	ONLY: i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr, &
170	nxrg, nyn, nys, nzb, nzb_u_inner, nzb_v_inner
171
172	USE interaction_droplets_ptq_mod, &
173	ONLY: interaction_droplets_ptq
174
175	USE kinds
176
177	USE ls_forcing_mod, &
178	ONLY: ls_forcing_surf, ls_forcing_vert
179
180	USE particle_attributes, &
181	ONLY: particle_advection, particle_advection_start, wang_kernel
182
183	USE pegrid
184
185	USE production_e_mod, &
186	ONLY: production_e_init
187
188	USE prognostic_equations_mod, &
189	ONLY: prognostic_equations_acc, prognostic_equations_cache, &
190	prognostic_equations_vector
191
192	USE statistics, &
193	ONLY: flow_statistics_called, hom, pr_palm
194
195	USE user_actions_mod, &
196	ONLY: user_actions
197
198	IMPLICIT NONE
199
200	CHARACTER (LEN=9) :: time_to_string !:
201
202	INTEGER(iwp) :: netcdf_data_format_save !:
203
204	!
205	!-- At the beginning of a simulation determine the time step as well as
206	!-- determine and print out the run control parameters
207	IF ( simulated_time == 0.0 ) CALL timestep
208
209	CALL run_control
210
211
212	!
213	!-- Data exchange between coupled models in case that a call has been omitted
214	!-- at the end of the previous run of a job chain.
215	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
216	!
217	!-- In case of model termination initiated by the local model the coupler
218	!-- must not be called because this would again cause an MPI hang.
219	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
220	CALL surface_coupler
221	time_coupling = time_coupling - dt_coupling
222	ENDDO
223	IF (time_coupling == 0.0 .AND. time_since_reference_point < dt_coupling)&
224	THEN
225	time_coupling = time_since_reference_point
226	ENDIF
227	ENDIF
228
229
230	#if defined( __dvrp_graphics )
231	!
232	!-- Time measurement with dvrp software
233	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
234	#endif
235
236	!
237	!-- Start of the time loop
238	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
239	.NOT. terminate_run )
240
241	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
242
243	!
244	!-- Determine size of next time step
245	IF ( simulated_time /= 0.0 ) THEN
246	CALL timestep
247	ENDIF
248
249	!
250	!-- Determine ug, vg and w_subs in dependence on data from external file
251	!-- LSF_DATA
252	IF ( large_scale_forcing .AND. lsf_vert ) THEN
253	CALL ls_forcing_vert ( simulated_time )
254	ENDIF
255
256	!
257	!-- Execute the user-defined actions
258	CALL user_actions( 'before_timestep' )
259
260	!
261	!-- Start of intermediate step loop
262	intermediate_timestep_count = 0
263	DO WHILE ( intermediate_timestep_count < &
264	intermediate_timestep_count_max )
265
266	intermediate_timestep_count = intermediate_timestep_count + 1
267
268	!
269	!-- Set the steering factors for the prognostic equations which depend
270	!-- on the timestep scheme
271	CALL timestep_scheme_steering
272
273	!
274	!-- Calculate those variables needed in the tendency terms which need
275	!-- global communication
276	IF ( .NOT. use_single_reference_value .AND. &
277	.NOT. use_initial_profile_as_reference ) THEN
278	!
279	!-- Horizontally averaged profiles to be used as reference state in
280	!-- buoyancy terms (WARNING: only the respective last call of
281	!-- calc_mean_profile defines the reference state!)
282	IF ( .NOT. neutral ) CALL calc_mean_profile( pt, 4, 'time_int' )
283	IF ( ocean ) CALL calc_mean_profile( rho, 64, 'time_int' )
284	IF ( humidity ) CALL calc_mean_profile( vpt, 44, 'time_int' )
285	ENDIF
286
287	IF ( .NOT. constant_diffusion ) CALL production_e_init
288	IF ( ( ws_scheme_mom .OR. ws_scheme_sca ) .AND. &
289	intermediate_timestep_count == 1 ) CALL ws_statistics
290
291	!
292	!-- Solve the prognostic equations. A fast cache optimized version with
293	!-- only one single loop is used in case of Piascek-Williams advection
294	!-- scheme. NEC vector machines use a different version, because
295	!-- in the other versions a good vectorization is prohibited due to
296	!-- inlining problems.
297	IF ( loop_optimization == 'cache' ) THEN
298	CALL prognostic_equations_cache
299	ELSEIF ( loop_optimization == 'vector' ) THEN
300	CALL prognostic_equations_vector
301	ELSEIF ( loop_optimization == 'acc' ) THEN
302	i_left = nxl; i_right = nxr
303	j_south = nys; j_north = nyn
304	CALL prognostic_equations_acc
305
306	! i_left = nxl; i_right = nxl+nbgp-1
307	! j_south = nys; j_north = nyn
308	! CALL prognostic_equations_acc
309	! i_left = nxr-nbgp+1; i_right = nxr
310	! j_south = nys; j_north = nyn
311	! CALL prognostic_equations_acc
312
313	!
314	!-- Exchange of ghost points (lateral boundary conditions)
315	IF ( background_communication ) THEN
316
317	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
318
319	send_receive = 'lr'
320	sendrecv_in_background = .TRUE.
321	req = 0
322	req_count = 0
323
324	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
325	on_device = .TRUE. ! to be removed after complete porting
326	ELSE ! of ghost point exchange
327	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
328	ENDIF
329
330	CALL exchange_horiz( u_p, nbgp )
331	CALL exchange_horiz( v_p, nbgp )
332	CALL exchange_horiz( w_p, nbgp )
333	CALL exchange_horiz( pt_p, nbgp )
334	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
335	IF ( ocean ) THEN
336	CALL exchange_horiz( sa_p, nbgp )
337	CALL exchange_horiz( rho, nbgp )
338	CALL exchange_horiz( prho, nbgp )
339	ENDIF
340	IF (humidity .OR. passive_scalar) THEN
341	CALL exchange_horiz( q_p, nbgp )
342	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
343	CALL exchange_horiz( qr_p, nbgp )
344	CALL exchange_horiz( nr_p, nbgp )
345	ENDIF
346	ENDIF
347	IF ( cloud_droplets ) THEN
348	CALL exchange_horiz( ql, nbgp )
349	CALL exchange_horiz( ql_c, nbgp )
350	CALL exchange_horiz( ql_v, nbgp )
351	CALL exchange_horiz( ql_vp, nbgp )
352	ENDIF
353	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
354
355	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
356	on_device = .FALSE. ! to be removed after complete porting
357	ELSE ! of ghost point exchange
358	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
359	ENDIF
360
361	sendrecv_in_background = .FALSE.
362
363	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
364
365	ENDIF
366
367	! i_left = nxl+nbgp; i_right = nxr-nbgp
368	! j_south = nys; j_north = nys+nbgp-1
369	! CALL prognostic_equations_acc
370	! i_left = nxl+nbgp; i_right = nxr-nbgp
371	! j_south = nyn-nbgp+1; j_north = nyn
372	! CALL prognostic_equations_acc
373
374	IF ( background_communication ) THEN
375	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
376	#if defined( __parallel )
377	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
378	#endif
379	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
380
381	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
382
383	send_receive = 'ns'
384	sendrecv_in_background = .TRUE.
385	req = 0
386	req_count = 0
387
388	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
389	on_device = .TRUE. ! to be removed after complete porting
390	ELSE ! of ghost point exchange
391	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
392	ENDIF
393
394	CALL exchange_horiz( u_p, nbgp )
395	CALL exchange_horiz( v_p, nbgp )
396	CALL exchange_horiz( w_p, nbgp )
397	CALL exchange_horiz( pt_p, nbgp )
398	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
399	IF ( ocean ) THEN
400	CALL exchange_horiz( sa_p, nbgp )
401	CALL exchange_horiz( rho, nbgp )
402	CALL exchange_horiz( prho, nbgp )
403	ENDIF
404	IF (humidity .OR. passive_scalar) THEN
405	CALL exchange_horiz( q_p, nbgp )
406	IF ( cloud_physics .AND. icloud_scheme == 0 ) THEN
407	CALL exchange_horiz( qr_p, nbgp )
408	CALL exchange_horiz( nr_p, nbgp )
409	ENDIF
410	ENDIF
411	IF ( cloud_droplets ) THEN
412	CALL exchange_horiz( ql, nbgp )
413	CALL exchange_horiz( ql_c, nbgp )
414	CALL exchange_horiz( ql_v, nbgp )
415	CALL exchange_horiz( ql_vp, nbgp )
416	ENDIF
417	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
418
419	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
420	on_device = .FALSE. ! to be removed after complete porting
421	ELSE ! of ghost point exchange
422	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
423	ENDIF
424
425	sendrecv_in_background = .FALSE.
426
427	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
428
429	ENDIF
430
431	! i_left = nxl+nbgp; i_right = nxr-nbgp
432	! j_south = nys+nbgp; j_north = nyn-nbgp
433	! CALL prognostic_equations_acc
434
435	IF ( background_communication ) THEN
436	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
437	#if defined( __parallel )
438	CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
439	#endif
440	send_receive = 'al'
441	CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
442	ENDIF
443
444	ENDIF
445
446	!
447	!-- Particle transport/physics with the Lagrangian particle model
448	!-- (only once during intermediate steps, because it uses an Euler-step)
449	!-- ### particle model should be moved before prognostic_equations, in order
450	!-- to regard droplet interactions directly
451	IF ( particle_advection .AND. &
452	simulated_time >= particle_advection_start .AND. &
453	intermediate_timestep_count == 1 ) THEN
454	CALL lpm
455	first_call_lpm = .FALSE.
456	ENDIF
457
458	!
459	!-- Interaction of droplets with temperature and specific humidity.
460	!-- Droplet condensation and evaporation is calculated within
461	!-- advec_particles.
462	IF ( cloud_droplets .AND. &
463	intermediate_timestep_count == intermediate_timestep_count_max )&
464	THEN
465	CALL interaction_droplets_ptq
466	ENDIF
467
468	!
469	!-- Exchange of ghost points (lateral boundary conditions)
470	IF ( .NOT. background_communication ) THEN
471
472	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
473
474	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
475	on_device = .TRUE. ! to be removed after complete porting
476	ELSE ! of ghost point exchange
477	!$acc update host( e_p, pt_p, u_p, v_p, w_p )
478	ENDIF
479
480	CALL exchange_horiz( u_p, nbgp )
481	CALL exchange_horiz( v_p, nbgp )
482	CALL exchange_horiz( w_p, nbgp )
483	CALL exchange_horiz( pt_p, nbgp )
484	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
485	IF ( ocean ) THEN
486	CALL exchange_horiz( sa_p, nbgp )
487	CALL exchange_horiz( rho, nbgp )
488	CALL exchange_horiz( prho, nbgp )
489	ENDIF
490	IF (humidity .OR. passive_scalar) THEN
491	CALL exchange_horiz( q_p, nbgp )
492	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
493	precipitation ) THEN
494	CALL exchange_horiz( qr_p, nbgp )
495	CALL exchange_horiz( nr_p, nbgp )
496	ENDIF
497	ENDIF
498	IF ( cloud_droplets ) THEN
499	CALL exchange_horiz( ql, nbgp )
500	CALL exchange_horiz( ql_c, nbgp )
501	CALL exchange_horiz( ql_v, nbgp )
502	CALL exchange_horiz( ql_vp, nbgp )
503	ENDIF
504	IF ( wang_kernel .OR. turbulence ) CALL exchange_horiz( diss, nbgp )
505
506	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
507	on_device = .FALSE. ! to be removed after complete porting
508	ELSE ! of ghost point exchange
509	!$acc update device( e_p, pt_p, u_p, v_p, w_p )
510	ENDIF
511
512	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
513
514	ENDIF
515
516	!
517	!-- Boundary conditions for the prognostic quantities (except of the
518	!-- velocities at the outflow in case of a non-cyclic lateral wall)
519	CALL boundary_conds
520
521	!
522	!-- Swap the time levels in preparation for the next time step.
523	CALL swap_timelevel
524
525	!
526	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
527	!-- when a sloping surface is used
528	IF ( sloping_surface ) THEN
529	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
530	pt_slope_offset
531	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
532	pt_slope_offset
533	ENDIF
534
535	!
536	!-- Impose a turbulent inflow using the recycling method
537	IF ( turbulent_inflow ) CALL inflow_turbulence
538
539	!
540	!-- Impose a random perturbation on the horizontal velocity field
541	IF ( create_disturbances .AND. &
542	( call_psolver_at_all_substeps .AND. &
543	intermediate_timestep_count == intermediate_timestep_count_max )&
544	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
545	intermediate_timestep_count == 1 ) ) &
546	THEN
547	time_disturb = time_disturb + dt_3d
548	IF ( time_disturb >= dt_disturb ) THEN
549	!$acc update host( u, v )
550	IF ( numprocs == 1 ) on_device = .FALSE. ! workaround, remove later
551	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
552	CALL disturb_field( nzb_u_inner, tend, u )
553	CALL disturb_field( nzb_v_inner, tend, v )
554	ELSEIF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
555	!
556	!-- Runs with a non-cyclic lateral wall need perturbations
557	!-- near the inflow throughout the whole simulation
558	dist_range = 1
559	CALL disturb_field( nzb_u_inner, tend, u )
560	CALL disturb_field( nzb_v_inner, tend, v )
561	dist_range = 0
562	ENDIF
563	IF ( numprocs == 1 ) on_device = .TRUE. ! workaround, remove later
564	!$acc update device( u, v )
565	time_disturb = time_disturb - dt_disturb
566	ENDIF
567	ENDIF
568
569	!
570	!-- Reduce the velocity divergence via the equation for perturbation
571	!-- pressure.
572	IF ( intermediate_timestep_count == 1 .OR. &
573	call_psolver_at_all_substeps ) THEN
574	CALL pres
575	ENDIF
576
577	!
578	!-- If required, compute liquid water content
579	IF ( cloud_physics ) THEN
580	CALL calc_liquid_water_content
581	!$acc update device( ql )
582	ENDIF
583	!
584	!-- If required, compute virtual potential temperature
585	IF ( humidity ) THEN
586	CALL compute_vpt
587	!$acc update device( vpt )
588	ENDIF
589	!
590	!-- Compute the diffusion quantities
591	IF ( .NOT. constant_diffusion ) THEN
592
593	!
594	!-- Determine surface fluxes shf and qsws and surface values
595	!-- pt_surface and q_surface in dependence on data from external
596	!-- file LSF_DATA respectively
597	IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
598	intermediate_timestep_count == intermediate_timestep_count_max )&
599	THEN
600	CALL ls_forcing_surf ( simulated_time )
601	ENDIF
602
603	!
604	!-- First the vertical fluxes in the Prandtl layer are being computed
605	IF ( prandtl_layer ) THEN
606	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
607	CALL prandtl_fluxes
608	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
609	ENDIF
610
611	!
612	!-- Compute the diffusion coefficients
613	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
614	IF ( .NOT. humidity ) THEN
615	IF ( ocean ) THEN
616	CALL diffusivities( prho, prho_reference )
617	ELSE
618	CALL diffusivities( pt, pt_reference )
619	ENDIF
620	ELSE
621	CALL diffusivities( vpt, pt_reference )
622	ENDIF
623	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
624
625	ENDIF
626
627	ENDDO ! Intermediate step loop
628
629	!
630	!-- Increase simulation time and output times
631	nr_timesteps_this_run = nr_timesteps_this_run + 1
632	current_timestep_number = current_timestep_number + 1
633	simulated_time = simulated_time + dt_3d
634	simulated_time_chr = time_to_string( simulated_time )
635	time_since_reference_point = simulated_time - coupling_start_time
636
637	IF ( simulated_time >= skip_time_data_output_av ) THEN
638	time_do_av = time_do_av + dt_3d
639	ENDIF
640	IF ( simulated_time >= skip_time_do2d_xy ) THEN
641	time_do2d_xy = time_do2d_xy + dt_3d
642	ENDIF
643	IF ( simulated_time >= skip_time_do2d_xz ) THEN
644	time_do2d_xz = time_do2d_xz + dt_3d
645	ENDIF
646	IF ( simulated_time >= skip_time_do2d_yz ) THEN
647	time_do2d_yz = time_do2d_yz + dt_3d
648	ENDIF
649	IF ( simulated_time >= skip_time_do3d ) THEN
650	time_do3d = time_do3d + dt_3d
651	ENDIF
652	DO mid = 1, masks
653	IF ( simulated_time >= skip_time_domask(mid) ) THEN
654	time_domask(mid)= time_domask(mid) + dt_3d
655	ENDIF
656	ENDDO
657	time_dvrp = time_dvrp + dt_3d
658	IF ( simulated_time >= skip_time_dosp ) THEN
659	time_dosp = time_dosp + dt_3d
660	ENDIF
661	time_dots = time_dots + dt_3d
662	IF ( .NOT. first_call_lpm ) THEN
663	time_dopts = time_dopts + dt_3d
664	ENDIF
665	IF ( simulated_time >= skip_time_dopr ) THEN
666	time_dopr = time_dopr + dt_3d
667	ENDIF
668	time_dopr_listing = time_dopr_listing + dt_3d
669	time_run_control = time_run_control + dt_3d
670
671	!
672	!-- Data exchange between coupled models
673	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
674	time_coupling = time_coupling + dt_3d
675
676	!
677	!-- In case of model termination initiated by the local model
678	!-- (terminate_coupled > 0), the coupler must be skipped because it would
679	!-- cause an MPI intercomminucation hang.
680	!-- If necessary, the coupler will be called at the beginning of the
681	!-- next restart run.
682	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
683	CALL surface_coupler
684	time_coupling = time_coupling - dt_coupling
685	ENDDO
686	ENDIF
687
688	!
689	!-- Execute user-defined actions
690	CALL user_actions( 'after_integration' )
691
692	!
693	!-- If Galilei transformation is used, determine the distance that the
694	!-- model has moved so far
695	IF ( galilei_transformation ) THEN
696	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
697	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
698	ENDIF
699
700	!
701	!-- Check, if restart is necessary (because cpu-time is expiring or
702	!-- because it is forced by user) and set stop flag
703	!-- This call is skipped if the remote model has already initiated a restart.
704	IF ( .NOT. terminate_run ) CALL check_for_restart
705
706	!
707	!-- Carry out statistical analysis and output at the requested output times.
708	!-- The MOD function is used for calculating the output time counters (like
709	!-- time_dopr) in order to regard a possible decrease of the output time
710	!-- interval in case of restart runs
711
712	!
713	!-- Set a flag indicating that so far no statistics have been created
714	!-- for this time step
715	flow_statistics_called = .FALSE.
716
717	!
718	!-- If required, call flow_statistics for averaging in time
719	IF ( averaging_interval_pr /= 0.0 .AND. &
720	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
721	simulated_time >= skip_time_dopr ) THEN
722	time_dopr_av = time_dopr_av + dt_3d
723	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
724	do_sum = .TRUE.
725	time_dopr_av = MOD( time_dopr_av, &
726	MAX( dt_averaging_input_pr, dt_3d ) )
727	ENDIF
728	ENDIF
729	IF ( do_sum ) CALL flow_statistics
730
731	!
732	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
733	IF ( averaging_interval /= 0.0 .AND. &
734	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
735	simulated_time >= skip_time_data_output_av ) &
736	THEN
737	time_do_sla = time_do_sla + dt_3d
738	IF ( time_do_sla >= dt_averaging_input ) THEN
739	CALL sum_up_3d_data
740	average_count_3d = average_count_3d + 1
741	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
742	ENDIF
743	ENDIF
744
745	!
746	!-- Calculate spectra for time averaging
747	IF ( averaging_interval_sp /= 0.0 .AND. &
748	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
749	simulated_time >= skip_time_dosp ) THEN
750	time_dosp_av = time_dosp_av + dt_3d
751	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
752	CALL calc_spectra
753	time_dosp_av = MOD( time_dosp_av, &
754	MAX( dt_averaging_input_pr, dt_3d ) )
755	ENDIF
756	ENDIF
757
758	!
759	!-- Computation and output of run control parameters.
760	!-- This is also done whenever perturbations have been imposed
761	IF ( time_run_control >= dt_run_control .OR. &
762	timestep_scheme(1:5) /= 'runge' .OR. disturbance_created ) &
763	THEN
764	CALL run_control
765	IF ( time_run_control >= dt_run_control ) THEN
766	time_run_control = MOD( time_run_control, &
767	MAX( dt_run_control, dt_3d ) )
768	ENDIF
769	ENDIF
770
771	!
772	!-- Profile output (ASCII) on file
773	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
774	CALL print_1d
775	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
776	dt_3d ) )
777	ENDIF
778
779	!
780	!-- Graphic output for PROFIL
781	IF ( time_dopr >= dt_dopr ) THEN
782	IF ( dopr_n /= 0 ) CALL data_output_profiles
783	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
784	time_dopr_av = 0.0 ! due to averaging (see above)
785	ENDIF
786
787	!
788	!-- Graphic output for time series
789	IF ( time_dots >= dt_dots ) THEN
790	CALL data_output_tseries
791	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
792	ENDIF
793
794	!
795	!-- Output of spectra (formatted for use with PROFIL), in case of no
796	!-- time averaging, spectra has to be calculated before
797	IF ( time_dosp >= dt_dosp ) THEN
798	IF ( average_count_sp == 0 ) CALL calc_spectra
799	CALL data_output_spectra
800	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
801	ENDIF
802
803	!
804	!-- 2d-data output (cross-sections)
805	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
806	CALL data_output_2d( 'xy', 0 )
807	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
808	ENDIF
809	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
810	CALL data_output_2d( 'xz', 0 )
811	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
812	ENDIF
813	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
814	CALL data_output_2d( 'yz', 0 )
815	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
816	ENDIF
817
818	!
819	!-- 3d-data output (volume data)
820	IF ( time_do3d >= dt_do3d ) THEN
821	CALL data_output_3d( 0 )
822	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
823	ENDIF
824
825	!
826	!-- masked data output
827	!-- Parallel netcdf output is not tested so far for masked data, hence
828	!-- netcdf_data_format is switched back to non-paralell output.
829	netcdf_data_format_save = netcdf_data_format
830	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
831	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
832	DO mid = 1, masks
833	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
834	CALL data_output_mask( 0 )
835	time_domask(mid) = MOD( time_domask(mid), &
836	MAX( dt_domask(mid), dt_3d ) )
837	ENDIF
838	ENDDO
839	netcdf_data_format = netcdf_data_format_save
840
841	!
842	!-- Output of time-averaged 2d/3d/masked data
843	IF ( time_do_av >= dt_data_output_av ) THEN
844	CALL average_3d_data
845	CALL data_output_2d( 'xy', 1 )
846	CALL data_output_2d( 'xz', 1 )
847	CALL data_output_2d( 'yz', 1 )
848	CALL data_output_3d( 1 )
849	!-- Parallel netcdf output is not tested so far for masked data, hence
850	!-- netcdf_data_format is switched back to non-paralell output.
851	netcdf_data_format_save = netcdf_data_format
852	IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
853	IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
854	DO mid = 1, masks
855	CALL data_output_mask( 1 )
856	ENDDO
857	netcdf_data_format = netcdf_data_format_save
858	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
859	ENDIF
860
861	!
862	!-- Output of particle time series
863	IF ( particle_advection ) THEN
864	IF ( time_dopts >= dt_dopts .OR. &
865	( simulated_time >= particle_advection_start .AND. &
866	first_call_lpm ) ) THEN
867	CALL data_output_ptseries
868	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
869	ENDIF
870	ENDIF
871
872	!
873	!-- Output of dvrp-graphics (isosurface, particles, slicer)
874	#if defined( __dvrp_graphics )
875	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
876	#endif
877	IF ( time_dvrp >= dt_dvrp ) THEN
878	CALL data_output_dvrp
879	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
880	ENDIF
881	#if defined( __dvrp_graphics )
882	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
883	#endif
884
885	!
886	!-- If required, set the heat flux for the next time step at a random value
887	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
888
889	!
890	!-- Execute user-defined actions
891	CALL user_actions( 'after_timestep' )
892
893	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
894
895
896	ENDDO ! time loop
897
898	#if defined( __dvrp_graphics )
899	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
900	#endif
901
902	END SUBROUTINE time_integration

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