source: palm/trunk/SOURCE/time_integration.f90 @ 1252

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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 1997-2012  Leibniz University Hannover
18!--------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: time_integration.f90 1242 2013-10-30 11:50:11Z heinze $
27!
28! 1241 2013-10-30 11:36:58Z heinze
29! Generalize calc_mean_profile for wider use
30! Determine shf and qsws in dependence on data from LSF_DATA
31! Determine ug and vg in dependence on data from LSF_DATA
32! 1221 2013-09-10 08:59:13Z raasch
33! host update of arrays before timestep is called
34!
35! 1179 2013-06-14 05:57:58Z raasch
36! mean profiles for reference state are only calculated if required,
37! small bugfix for background communication
38!
39! 1171 2013-05-30 11:27:45Z raasch
40! split of prognostic_equations deactivated (comment lines), for the time being
41!
42! 1128 2013-04-12 06:19:32Z raasch
43! asynchronous transfer of ghost point data realized for acc-optimized version:
44! prognostic_equations are first called two times for those points required for
45! the left-right and north-south exchange, respectively, and then for the
46! remaining points,
47! those parts requiring global communication moved from prognostic_equations to
48! here
49!
50! 1115 2013-03-26 18:16:16Z hoffmann
51! calculation of qr and nr is restricted to precipitation
52!
53! 1113 2013-03-10 02:48:14Z raasch
54! GPU-porting of boundary conditions,
55! openACC directives updated
56! formal parameter removed from routine boundary_conds
57!
58! 1111 2013-03-08 23:54:10Z raasch
59! +internal timestep counter for cpu statistics added,
60! openACC directives updated
61!
62! 1092 2013-02-02 11:24:22Z raasch
63! unused variables removed
64!
65! 1065 2012-11-22 17:42:36Z hoffmann
66! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
67!
68! 1053 2012-11-13 17:11:03Z hoffmann
69! exchange of ghost points for nr, qr added
70!
71! 1036 2012-10-22 13:43:42Z raasch
72! code put under GPL (PALM 3.9)
73!
74! 1019 2012-09-28 06:46:45Z raasch
75! non-optimized version of prognostic_equations removed
76!
77! 1015 2012-09-27 09:23:24Z raasch
78! +call of prognostic_equations_acc
79!
80! 1001 2012-09-13 14:08:46Z raasch
81! all actions concerning leapfrog- and upstream-spline-scheme removed
82!
83! 849 2012-03-15 10:35:09Z raasch
84! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
85!
86! 825 2012-02-19 03:03:44Z raasch
87! wang_collision_kernel renamed wang_kernel
88!
89! 790 2011-11-29 03:11:20Z raasch
90! exchange of ghostpoints for array diss
91!
92! 707 2011-03-29 11:39:40Z raasch
93! bc_lr/ns replaced by bc_lr/ns_cyc, calls of exchange_horiz are modified,
94! adaption to sloping surface
95!
96! 667  2010-12-23 12:06:00Z suehring/gryschka
97! Calls of exchange_horiz are modified.
98! Adaption to slooping surface.
99!
100! 449 2010-02-02 11:23:59Z raasch
101! Bugfix: exchange of ghost points for prho included
102!
103! 410 2009-12-04 17:05:40Z letzel
104! masked data output
105!
106! 388 2009-09-23 09:40:33Z raasch
107! Using prho instead of rho in diffusvities.
108! Coupling with independent precursor runs.
109! Bugfix: output of particle time series only if particle advection is switched
110!         on
111!
112! 151 2008-03-07 13:42:18Z raasch
113! inflow turbulence is imposed by calling new routine inflow_turbulence
114!
115! 108 2007-08-24 15:10:38Z letzel
116! Call of new routine surface_coupler,
117! presure solver is called after the first Runge-Kutta substep instead of the
118! last in case that call_psolver_at_all_substeps = .F.; for this case, the
119! random perturbation has to be added to the velocity fields also after the
120! first substep
121!
122! 97 2007-06-21 08:23:15Z raasch
123! diffusivities is called with argument rho in case of ocean runs,
124! new argument pt_/prho_reference in calls of diffusivities,
125! ghostpoint exchange for salinity and density
126!
127! 87 2007-05-22 15:46:47Z raasch
128! var_hom renamed pr_palm
129!
130! 75 2007-03-22 09:54:05Z raasch
131! Move call of user_actions( 'after_integration' ) below increment of times
132! and counters,
133! calls of prognostic_equations_.. changed to .._noopt, .._cache, and
134! .._vector, these calls are now controlled by switch loop_optimization,
135! uxrp, vynp eliminated, 2nd+3rd argument removed from exchange horiz,
136! moisture renamed humidity
137!
138! RCS Log replace by Id keyword, revision history cleaned up
139!
140! Revision 1.8  2006/08/22 14:16:05  raasch
141! Disturbances are imposed only for the last Runge-Kutta-substep
142!
143! Revision 1.2  2004/04/30 13:03:40  raasch
144! decalpha-specific warning removed, routine name changed to time_integration,
145! particle advection is carried out only once during the intermediate steps,
146! impulse_advec renamed momentum_advec
147!
148! Revision 1.1  1997/08/11 06:19:04  raasch
149! Initial revision
150!
151!
152! Description:
153! ------------
154! Integration in time of the model equations, statistical analysis and graphic
155! output
156!------------------------------------------------------------------------------!
157
158    USE advec_ws
159    USE arrays_3d
160    USE averaging
161    USE buoyancy_mod
162    USE control_parameters
163    USE cpulog
164#if defined( __dvrp_graphics )
165    USE DVRP
166#endif
167    USE grid_variables
168    USE indices
169    USE interaction_droplets_ptq_mod
170    USE interfaces
171    USE ls_forcing_mod
172    USE particle_attributes
173    USE pegrid
174    USE production_e_mod
175    USE prognostic_equations_mod
176    USE statistics
177    USE user_actions_mod
178
179    IMPLICIT NONE
180
181    CHARACTER (LEN=9) ::  time_to_string
182
183!
184!-- At the beginning of a simulation determine the time step as well as
185!-- determine and print out the run control parameters
186    IF ( simulated_time == 0.0 )  CALL timestep
187
188    CALL run_control
189
190
191!
192!-- Data exchange between coupled models in case that a call has been omitted
193!-- at the end of the previous run of a job chain.
194    IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
195!
196!--    In case of model termination initiated by the local model the coupler
197!--    must not be called because this would again cause an MPI hang.
198       DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
199          CALL surface_coupler
200          time_coupling = time_coupling - dt_coupling
201       ENDDO
202       IF (time_coupling == 0.0 .AND. time_since_reference_point < dt_coupling)&
203       THEN
204          time_coupling = time_since_reference_point
205       ENDIF
206    ENDIF
207
208
209#if defined( __dvrp_graphics )
210!
211!-- Time measurement with dvrp software 
212    CALL DVRP_LOG_EVENT( 2, current_timestep_number )
213#endif
214
215!
216!-- Start of the time loop
217    DO  WHILE ( simulated_time < end_time  .AND.  .NOT. stop_dt  .AND. &
218                .NOT. terminate_run )
219
220       CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
221
222!
223!--    Determine size of next time step
224       IF ( simulated_time /= 0.0 )  THEN
225          !$acc update host( kh, km, u, v, w )
226          CALL timestep
227       ENDIF
228
229!
230!--    Determine ug, vg and w_subs in dependence on data from external file
231!--    LSF_DATA
232       IF ( large_scale_forcing .AND. lsf_vert ) THEN
233           CALL ls_forcing_vert ( simulated_time )
234       ENDIF
235
236!
237!--    Execute the user-defined actions
238       CALL user_actions( 'before_timestep' )
239
240!
241!--    Start of intermediate step loop
242       intermediate_timestep_count = 0
243       DO  WHILE ( intermediate_timestep_count < &
244                   intermediate_timestep_count_max )
245
246          intermediate_timestep_count = intermediate_timestep_count + 1
247
248!
249!--       Set the steering factors for the prognostic equations which depend
250!--       on the timestep scheme
251          CALL timestep_scheme_steering
252
253!
254!--       Calculate those variables needed in the tendency terms which need
255!--       global communication
256          IF ( .NOT. use_single_reference_value  .AND. &
257               .NOT. use_initial_profile_as_reference )  THEN
258!
259!--          Horizontally averaged profiles to be used as reference state in
260!--          buoyancy terms (WARNING: only the respective last call of
261!--          calc_mean_profile defines the reference state!)
262             IF ( .NOT. neutral )  CALL calc_mean_profile( pt, 4, 'time_int' )
263             IF ( ocean         )  CALL calc_mean_profile( rho, 64, 'time_int' )
264             IF ( humidity      )  CALL calc_mean_profile( vpt, 44, 'time_int' )
265          ENDIF
266
267          IF ( .NOT. constant_diffusion )  CALL production_e_init
268          IF ( ( ws_scheme_mom .OR. ws_scheme_sca )  .AND.  &
269               intermediate_timestep_count == 1 )  CALL ws_statistics
270
271!
272!--       Solve the prognostic equations. A fast cache optimized version with
273!--       only one single loop is used in case of Piascek-Williams advection
274!--       scheme. NEC vector machines use a different version, because
275!--       in the other versions a good vectorization is prohibited due to
276!--       inlining problems.
277          IF ( loop_optimization == 'cache' )  THEN
278             CALL prognostic_equations_cache
279          ELSEIF ( loop_optimization == 'vector' )  THEN
280             CALL prognostic_equations_vector
281          ELSEIF ( loop_optimization == 'acc' )  THEN
282             i_left  = nxl;         i_right = nxr
283             j_south = nys;         j_north = nyn
284             CALL prognostic_equations_acc
285
286!             i_left  = nxl;         i_right = nxl+nbgp-1
287!             j_south = nys;         j_north = nyn
288!             CALL prognostic_equations_acc
289!             i_left  = nxr-nbgp+1;  i_right = nxr
290!             j_south = nys;         j_north = nyn
291!             CALL prognostic_equations_acc
292
293!
294!--          Exchange of ghost points (lateral boundary conditions)
295             IF ( background_communication )  THEN
296
297                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
298               
299                send_receive = 'lr'
300                sendrecv_in_background = .TRUE.
301                req          = 0
302                req_count    = 0
303
304                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
305                   on_device = .TRUE.         ! to be removed after complete porting
306                ELSE                          ! of ghost point exchange
307                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
308                ENDIF
309
310                CALL exchange_horiz( u_p, nbgp )
311                CALL exchange_horiz( v_p, nbgp )
312                CALL exchange_horiz( w_p, nbgp )
313                CALL exchange_horiz( pt_p, nbgp )
314                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
315                IF ( ocean )  THEN
316                   CALL exchange_horiz( sa_p, nbgp )
317                   CALL exchange_horiz( rho, nbgp )
318                  CALL exchange_horiz( prho, nbgp )
319                ENDIF
320                IF (humidity  .OR.  passive_scalar)  THEN
321                   CALL exchange_horiz( q_p, nbgp )
322                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
323                      CALL exchange_horiz( qr_p, nbgp )
324                      CALL exchange_horiz( nr_p, nbgp )
325                   ENDIF
326                ENDIF
327                IF ( cloud_droplets )  THEN
328                   CALL exchange_horiz( ql, nbgp )
329                   CALL exchange_horiz( ql_c, nbgp )
330                   CALL exchange_horiz( ql_v, nbgp )
331                   CALL exchange_horiz( ql_vp, nbgp )
332                ENDIF
333                IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
334
335                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
336                   on_device = .FALSE.        ! to be removed after complete porting
337                ELSE                          ! of ghost point exchange
338                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
339                ENDIF
340
341                sendrecv_in_background = .FALSE.
342
343                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
344
345             ENDIF
346
347!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
348!             j_south = nys;         j_north = nys+nbgp-1
349!             CALL prognostic_equations_acc
350!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
351!             j_south = nyn-nbgp+1;  j_north = nyn
352!             CALL prognostic_equations_acc
353
354             IF ( background_communication )  THEN
355                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
356#if defined( __parallel )
357                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
358#endif
359                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
360
361                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
362
363                send_receive = 'ns'
364                sendrecv_in_background = .TRUE.
365                req          = 0
366                req_count    = 0
367
368                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
369                   on_device = .TRUE.         ! to be removed after complete porting
370                ELSE                          ! of ghost point exchange
371                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
372                ENDIF
373
374                CALL exchange_horiz( u_p, nbgp )
375                CALL exchange_horiz( v_p, nbgp )
376                CALL exchange_horiz( w_p, nbgp )
377                CALL exchange_horiz( pt_p, nbgp )
378                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
379                IF ( ocean )  THEN
380                   CALL exchange_horiz( sa_p, nbgp )
381                   CALL exchange_horiz( rho, nbgp )
382                  CALL exchange_horiz( prho, nbgp )
383                ENDIF
384                IF (humidity  .OR.  passive_scalar)  THEN
385                   CALL exchange_horiz( q_p, nbgp )
386                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
387                      CALL exchange_horiz( qr_p, nbgp )
388                      CALL exchange_horiz( nr_p, nbgp )
389                   ENDIF
390                ENDIF
391                IF ( cloud_droplets )  THEN
392                   CALL exchange_horiz( ql, nbgp )
393                   CALL exchange_horiz( ql_c, nbgp )
394                   CALL exchange_horiz( ql_v, nbgp )
395                   CALL exchange_horiz( ql_vp, nbgp )
396                ENDIF
397                IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
398
399                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
400                   on_device = .FALSE.        ! to be removed after complete porting
401                ELSE                          ! of ghost point exchange
402                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
403                ENDIF
404
405                sendrecv_in_background = .FALSE.
406
407                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
408
409             ENDIF
410
411!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
412!             j_south = nys+nbgp;    j_north = nyn-nbgp
413!             CALL prognostic_equations_acc
414
415             IF ( background_communication )  THEN
416                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
417#if defined( __parallel )
418                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
419#endif
420                send_receive = 'al'
421                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
422             ENDIF
423
424          ENDIF
425
426!
427!--       Particle transport/physics with the Lagrangian particle model
428!--       (only once during intermediate steps, because it uses an Euler-step)
429!--       ### particle model should be moved before prognostic_equations, in order
430!--       to regard droplet interactions directly
431          IF ( particle_advection  .AND.                         &
432               simulated_time >= particle_advection_start  .AND. &
433               intermediate_timestep_count == 1 )  THEN
434             CALL lpm
435             first_call_lpm = .FALSE.
436          ENDIF
437
438!
439!--       Interaction of droplets with temperature and specific humidity.
440!--       Droplet condensation and evaporation is calculated within
441!--       advec_particles.
442          IF ( cloud_droplets  .AND.  &
443               intermediate_timestep_count == intermediate_timestep_count_max )&
444          THEN
445             CALL interaction_droplets_ptq
446          ENDIF
447
448!
449!--       Exchange of ghost points (lateral boundary conditions)
450          IF ( .NOT. background_communication )  THEN
451
452             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
453
454             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
455                on_device = .TRUE.         ! to be removed after complete porting
456             ELSE                          ! of ghost point exchange
457                !$acc update host( e_p, pt_p, u_p, v_p, w_p )
458             ENDIF
459
460             CALL exchange_horiz( u_p, nbgp )
461             CALL exchange_horiz( v_p, nbgp )
462             CALL exchange_horiz( w_p, nbgp )
463             CALL exchange_horiz( pt_p, nbgp )
464             IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
465             IF ( ocean )  THEN
466                CALL exchange_horiz( sa_p, nbgp )
467                CALL exchange_horiz( rho, nbgp )
468                CALL exchange_horiz( prho, nbgp )
469             ENDIF
470             IF (humidity  .OR.  passive_scalar)  THEN
471                CALL exchange_horiz( q_p, nbgp )
472                IF ( cloud_physics .AND. icloud_scheme == 0  .AND.  &
473                     precipitation )  THEN
474                   CALL exchange_horiz( qr_p, nbgp )
475                   CALL exchange_horiz( nr_p, nbgp )
476                ENDIF
477             ENDIF
478             IF ( cloud_droplets )  THEN
479                CALL exchange_horiz( ql, nbgp )
480                CALL exchange_horiz( ql_c, nbgp )
481                CALL exchange_horiz( ql_v, nbgp )
482                CALL exchange_horiz( ql_vp, nbgp )
483             ENDIF
484             IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
485
486             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
487                on_device = .FALSE.        ! to be removed after complete porting
488             ELSE                          ! of ghost point exchange
489                !$acc update device( e_p, pt_p, u_p, v_p, w_p )
490             ENDIF
491
492             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
493
494          ENDIF
495
496!
497!--       Boundary conditions for the prognostic quantities (except of the
498!--       velocities at the outflow in case of a non-cyclic lateral wall)
499          CALL boundary_conds
500
501!
502!--       Swap the time levels in preparation for the next time step.
503          CALL swap_timelevel
504
505!
506!--       Temperature offset must be imposed at cyclic boundaries in x-direction
507!--       when a sloping surface is used
508          IF ( sloping_surface )  THEN
509             IF ( nxl ==  0 )  pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
510                                                    pt_slope_offset
511             IF ( nxr == nx )  pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
512                                                    pt_slope_offset
513          ENDIF
514
515!
516!--       Impose a turbulent inflow using the recycling method
517          IF ( turbulent_inflow )  CALL  inflow_turbulence
518
519!
520!--       Impose a random perturbation on the horizontal velocity field
521          IF ( create_disturbances  .AND.                                      &
522               ( call_psolver_at_all_substeps  .AND.                           &
523               intermediate_timestep_count == intermediate_timestep_count_max )&
524          .OR. ( .NOT. call_psolver_at_all_substeps  .AND.                     &
525               intermediate_timestep_count == 1 ) )                            &
526          THEN
527             time_disturb = time_disturb + dt_3d
528             IF ( time_disturb >= dt_disturb )  THEN
529                !$acc update host( u, v )
530                IF ( numprocs == 1 )  on_device = .FALSE.  ! workaround, remove later
531                IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit )  THEN
532                   CALL disturb_field( nzb_u_inner, tend, u )
533                   CALL disturb_field( nzb_v_inner, tend, v )
534                ELSEIF ( .NOT. bc_lr_cyc  .OR.  .NOT. bc_ns_cyc )  THEN
535!
536!--                Runs with a non-cyclic lateral wall need perturbations
537!--                near the inflow throughout the whole simulation
538                   dist_range = 1
539                   CALL disturb_field( nzb_u_inner, tend, u )
540                   CALL disturb_field( nzb_v_inner, tend, v )
541                   dist_range = 0
542                ENDIF
543                IF ( numprocs == 1 )  on_device = .TRUE.  ! workaround, remove later
544                !$acc update device( u, v )
545                time_disturb = time_disturb - dt_disturb
546             ENDIF
547          ENDIF
548
549!
550!--       Reduce the velocity divergence via the equation for perturbation
551!--       pressure.
552          IF ( intermediate_timestep_count == 1  .OR. &
553                call_psolver_at_all_substeps )  THEN
554             CALL pres
555          ENDIF
556
557!
558!--       If required, compute liquid water content
559          IF ( cloud_physics )  THEN
560             CALL calc_liquid_water_content
561             !$acc update device( ql )
562          ENDIF
563!
564!--       If required, compute virtual potential temperature
565          IF ( humidity )  THEN
566             CALL compute_vpt 
567             !$acc update device( vpt )
568          ENDIF 
569!
570!--       Compute the diffusion quantities
571          IF ( .NOT. constant_diffusion )  THEN
572
573!
574!--          First the vertical fluxes in the Prandtl layer are being computed
575             IF ( prandtl_layer )  THEN
576                CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
577                CALL prandtl_fluxes
578                CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
579             ENDIF
580
581!
582!--          Determine shf and qsws in dependence on data from external file
583!--          LSF_DATA
584             IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
585                 intermediate_timestep_count == intermediate_timestep_count_max )&
586             THEN
587                CALL ls_forcing_surf ( simulated_time )
588             ENDIF
589
590!
591!--          Compute the diffusion coefficients
592             CALL cpu_log( log_point(17), 'diffusivities', 'start' )
593             IF ( .NOT. humidity ) THEN
594                IF ( ocean )  THEN
595                   CALL diffusivities( prho, prho_reference )
596                ELSE
597                   CALL diffusivities( pt, pt_reference )
598                ENDIF
599             ELSE
600                CALL diffusivities( vpt, pt_reference )
601             ENDIF
602             CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
603
604          ENDIF
605
606       ENDDO   ! Intermediate step loop
607
608!
609!--    Increase simulation time and output times
610       nr_timesteps_this_run      = nr_timesteps_this_run + 1
611       current_timestep_number    = current_timestep_number + 1
612       simulated_time             = simulated_time   + dt_3d
613       simulated_time_chr         = time_to_string( simulated_time )
614       time_since_reference_point = simulated_time - coupling_start_time
615
616       IF ( simulated_time >= skip_time_data_output_av )  THEN
617          time_do_av         = time_do_av       + dt_3d
618       ENDIF
619       IF ( simulated_time >= skip_time_do2d_xy )  THEN
620          time_do2d_xy       = time_do2d_xy     + dt_3d
621       ENDIF
622       IF ( simulated_time >= skip_time_do2d_xz )  THEN
623          time_do2d_xz       = time_do2d_xz     + dt_3d
624       ENDIF
625       IF ( simulated_time >= skip_time_do2d_yz )  THEN
626          time_do2d_yz       = time_do2d_yz     + dt_3d
627       ENDIF
628       IF ( simulated_time >= skip_time_do3d    )  THEN
629          time_do3d          = time_do3d        + dt_3d
630       ENDIF
631       DO  mid = 1, masks
632          IF ( simulated_time >= skip_time_domask(mid) )  THEN
633             time_domask(mid)= time_domask(mid) + dt_3d
634          ENDIF
635       ENDDO
636       time_dvrp          = time_dvrp        + dt_3d
637       IF ( simulated_time >= skip_time_dosp )  THEN
638          time_dosp       = time_dosp        + dt_3d
639       ENDIF
640       time_dots          = time_dots        + dt_3d
641       IF ( .NOT. first_call_lpm )  THEN
642          time_dopts      = time_dopts       + dt_3d
643       ENDIF
644       IF ( simulated_time >= skip_time_dopr )  THEN
645          time_dopr       = time_dopr        + dt_3d
646       ENDIF
647       time_dopr_listing          = time_dopr_listing        + dt_3d
648       time_run_control   = time_run_control + dt_3d
649
650!
651!--    Data exchange between coupled models
652       IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
653          time_coupling = time_coupling + dt_3d
654
655!
656!--       In case of model termination initiated by the local model
657!--       (terminate_coupled > 0), the coupler must be skipped because it would
658!--       cause an MPI intercomminucation hang.
659!--       If necessary, the coupler will be called at the beginning of the
660!--       next restart run.
661          DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
662             CALL surface_coupler
663             time_coupling = time_coupling - dt_coupling
664          ENDDO
665       ENDIF
666
667!
668!--    Execute user-defined actions
669       CALL user_actions( 'after_integration' )
670
671!
672!--    If Galilei transformation is used, determine the distance that the
673!--    model has moved so far
674       IF ( galilei_transformation )  THEN
675          advected_distance_x = advected_distance_x + u_gtrans * dt_3d
676          advected_distance_y = advected_distance_y + v_gtrans * dt_3d
677       ENDIF
678
679!
680!--    Check, if restart is necessary (because cpu-time is expiring or
681!--    because it is forced by user) and set stop flag
682!--    This call is skipped if the remote model has already initiated a restart.
683       IF ( .NOT. terminate_run )  CALL check_for_restart
684
685!
686!--    Carry out statistical analysis and output at the requested output times.
687!--    The MOD function is used for calculating the output time counters (like
688!--    time_dopr) in order to regard a possible decrease of the output time
689!--    interval in case of restart runs
690
691!
692!--    Set a flag indicating that so far no statistics have been created
693!--    for this time step
694       flow_statistics_called = .FALSE.
695
696!
697!--    If required, call flow_statistics for averaging in time
698       IF ( averaging_interval_pr /= 0.0  .AND.  &
699            ( dt_dopr - time_dopr ) <= averaging_interval_pr  .AND.  &
700            simulated_time >= skip_time_dopr )  THEN
701          time_dopr_av = time_dopr_av + dt_3d
702          IF ( time_dopr_av >= dt_averaging_input_pr )  THEN
703             do_sum = .TRUE.
704             time_dopr_av = MOD( time_dopr_av, &
705                                    MAX( dt_averaging_input_pr, dt_3d ) )
706          ENDIF
707       ENDIF
708       IF ( do_sum )  CALL flow_statistics
709
710!
711!--    Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
712       IF ( averaging_interval /= 0.0  .AND.                                &
713            ( dt_data_output_av - time_do_av ) <= averaging_interval  .AND. &
714            simulated_time >= skip_time_data_output_av )                    &
715       THEN
716          time_do_sla = time_do_sla + dt_3d
717          IF ( time_do_sla >= dt_averaging_input )  THEN
718             CALL sum_up_3d_data
719             average_count_3d = average_count_3d + 1
720             time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
721          ENDIF
722       ENDIF
723
724!
725!--    Calculate spectra for time averaging
726       IF ( averaging_interval_sp /= 0.0  .AND.  &
727            ( dt_dosp - time_dosp ) <= averaging_interval_sp  .AND.  &
728            simulated_time >= skip_time_dosp )  THEN
729          time_dosp_av = time_dosp_av + dt_3d
730          IF ( time_dosp_av >= dt_averaging_input_pr )  THEN
731             CALL calc_spectra
732             time_dosp_av = MOD( time_dosp_av, &
733                                 MAX( dt_averaging_input_pr, dt_3d ) )
734          ENDIF
735       ENDIF
736
737!
738!--    Computation and output of run control parameters.
739!--    This is also done whenever perturbations have been imposed
740       IF ( time_run_control >= dt_run_control  .OR.                     &
741            timestep_scheme(1:5) /= 'runge'  .OR.  disturbance_created ) &
742       THEN
743          CALL run_control
744          IF ( time_run_control >= dt_run_control )  THEN
745             time_run_control = MOD( time_run_control, &
746                                     MAX( dt_run_control, dt_3d ) )
747          ENDIF
748       ENDIF
749
750!
751!--    Profile output (ASCII) on file
752       IF ( time_dopr_listing >= dt_dopr_listing )  THEN
753          CALL print_1d
754          time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
755                                                           dt_3d ) )
756       ENDIF
757
758!
759!--    Graphic output for PROFIL
760       IF ( time_dopr >= dt_dopr )  THEN
761          IF ( dopr_n /= 0 )  CALL data_output_profiles
762          time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
763          time_dopr_av = 0.0    ! due to averaging (see above)
764       ENDIF
765
766!
767!--    Graphic output for time series
768       IF ( time_dots >= dt_dots )  THEN
769          CALL data_output_tseries
770          time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
771       ENDIF
772
773!
774!--    Output of spectra (formatted for use with PROFIL), in case of no
775!--    time averaging, spectra has to be calculated before
776       IF ( time_dosp >= dt_dosp )  THEN
777          IF ( average_count_sp == 0 )  CALL calc_spectra
778          CALL data_output_spectra
779          time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
780       ENDIF
781
782!
783!--    2d-data output (cross-sections)
784       IF ( time_do2d_xy >= dt_do2d_xy )  THEN
785          CALL data_output_2d( 'xy', 0 )
786          time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
787       ENDIF
788       IF ( time_do2d_xz >= dt_do2d_xz )  THEN
789          CALL data_output_2d( 'xz', 0 )
790          time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
791       ENDIF
792       IF ( time_do2d_yz >= dt_do2d_yz )  THEN
793          CALL data_output_2d( 'yz', 0 )
794          time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
795       ENDIF
796
797!
798!--    3d-data output (volume data)
799       IF ( time_do3d >= dt_do3d )  THEN
800          CALL data_output_3d( 0 )
801          time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
802       ENDIF
803
804!
805!--    masked data output
806       DO  mid = 1, masks
807          IF ( time_domask(mid) >= dt_domask(mid) )  THEN
808             CALL data_output_mask( 0 )
809             time_domask(mid) = MOD( time_domask(mid),  &
810                                     MAX( dt_domask(mid), dt_3d ) )
811          ENDIF
812       ENDDO
813
814!
815!--    Output of time-averaged 2d/3d/masked data
816       IF ( time_do_av >= dt_data_output_av )  THEN
817          CALL average_3d_data
818          CALL data_output_2d( 'xy', 1 )
819          CALL data_output_2d( 'xz', 1 )
820          CALL data_output_2d( 'yz', 1 )
821          CALL data_output_3d( 1 )
822          DO  mid = 1, masks
823             CALL data_output_mask( 1 )
824          ENDDO
825          time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
826       ENDIF
827
828!
829!--    Output of particle time series
830       IF ( particle_advection )  THEN
831          IF ( time_dopts >= dt_dopts  .OR. &
832               ( simulated_time >= particle_advection_start  .AND. &
833                 first_call_lpm ) )  THEN
834             CALL data_output_ptseries
835             time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
836          ENDIF
837       ENDIF
838
839!
840!--    Output of dvrp-graphics (isosurface, particles, slicer)
841#if defined( __dvrp_graphics )
842       CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
843#endif
844       IF ( time_dvrp >= dt_dvrp )  THEN
845          CALL data_output_dvrp
846          time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
847       ENDIF
848#if defined( __dvrp_graphics )
849       CALL DVRP_LOG_EVENT( 2, current_timestep_number )
850#endif
851
852!
853!--    If required, set the heat flux for the next time step at a random value
854       IF ( constant_heatflux  .AND.  random_heatflux )  CALL disturb_heatflux
855
856!
857!--    Execute user-defined actions
858       CALL user_actions( 'after_timestep' )
859
860       CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
861
862
863    ENDDO   ! time loop
864
865#if defined( __dvrp_graphics )
866    CALL DVRP_LOG_EVENT( -2, current_timestep_number )
867#endif
868
869 END SUBROUTINE time_integration
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