source: palm/trunk/SOURCE/time_integration.f90 @ 1277

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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 1277 2014-01-15 13:43:45Z heinze $
27!
28! 1276 2014-01-15 13:40:41Z heinze
29! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
30!
31! 1257 2013-11-08 15:18:40Z raasch
32! acc-update-host directive for timestep removed
33!
34! 1241 2013-10-30 11:36:58Z heinze
35! Generalize calc_mean_profile for wider use
36! Determine shf and qsws in dependence on data from LSF_DATA
37! Determine ug and vg in dependence on data from LSF_DATA
38! 1221 2013-09-10 08:59:13Z raasch
39! host update of arrays before timestep is called
40!
41! 1179 2013-06-14 05:57:58Z raasch
42! mean profiles for reference state are only calculated if required,
43! small bugfix for background communication
44!
45! 1171 2013-05-30 11:27:45Z raasch
46! split of prognostic_equations deactivated (comment lines), for the time being
47!
48! 1128 2013-04-12 06:19:32Z raasch
49! asynchronous transfer of ghost point data realized for acc-optimized version:
50! prognostic_equations are first called two times for those points required for
51! the left-right and north-south exchange, respectively, and then for the
52! remaining points,
53! those parts requiring global communication moved from prognostic_equations to
54! here
55!
56! 1115 2013-03-26 18:16:16Z hoffmann
57! calculation of qr and nr is restricted to precipitation
58!
59! 1113 2013-03-10 02:48:14Z raasch
60! GPU-porting of boundary conditions,
61! openACC directives updated
62! formal parameter removed from routine boundary_conds
63!
64! 1111 2013-03-08 23:54:10Z raasch
65! +internal timestep counter for cpu statistics added,
66! openACC directives updated
67!
68! 1092 2013-02-02 11:24:22Z raasch
69! unused variables removed
70!
71! 1065 2012-11-22 17:42:36Z hoffmann
72! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
73!
74! 1053 2012-11-13 17:11:03Z hoffmann
75! exchange of ghost points for nr, qr added
76!
77! 1036 2012-10-22 13:43:42Z raasch
78! code put under GPL (PALM 3.9)
79!
80! 1019 2012-09-28 06:46:45Z raasch
81! non-optimized version of prognostic_equations removed
82!
83! 1015 2012-09-27 09:23:24Z raasch
84! +call of prognostic_equations_acc
85!
86! 1001 2012-09-13 14:08:46Z raasch
87! all actions concerning leapfrog- and upstream-spline-scheme removed
88!
89! 849 2012-03-15 10:35:09Z raasch
90! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
91!
92! 825 2012-02-19 03:03:44Z raasch
93! wang_collision_kernel renamed wang_kernel
94!
95! 790 2011-11-29 03:11:20Z raasch
96! exchange of ghostpoints for array diss
97!
98! 707 2011-03-29 11:39:40Z raasch
99! bc_lr/ns replaced by bc_lr/ns_cyc, calls of exchange_horiz are modified,
100! adaption to sloping surface
101!
102! 667  2010-12-23 12:06:00Z suehring/gryschka
103! Calls of exchange_horiz are modified.
104! Adaption to slooping surface.
105!
106! 449 2010-02-02 11:23:59Z raasch
107! Bugfix: exchange of ghost points for prho included
108!
109! 410 2009-12-04 17:05:40Z letzel
110! masked data output
111!
112! 388 2009-09-23 09:40:33Z raasch
113! Using prho instead of rho in diffusvities.
114! Coupling with independent precursor runs.
115! Bugfix: output of particle time series only if particle advection is switched
116!         on
117!
118! 151 2008-03-07 13:42:18Z raasch
119! inflow turbulence is imposed by calling new routine inflow_turbulence
120!
121! 108 2007-08-24 15:10:38Z letzel
122! Call of new routine surface_coupler,
123! presure solver is called after the first Runge-Kutta substep instead of the
124! last in case that call_psolver_at_all_substeps = .F.; for this case, the
125! random perturbation has to be added to the velocity fields also after the
126! first substep
127!
128! 97 2007-06-21 08:23:15Z raasch
129! diffusivities is called with argument rho in case of ocean runs,
130! new argument pt_/prho_reference in calls of diffusivities,
131! ghostpoint exchange for salinity and density
132!
133! 87 2007-05-22 15:46:47Z raasch
134! var_hom renamed pr_palm
135!
136! 75 2007-03-22 09:54:05Z raasch
137! Move call of user_actions( 'after_integration' ) below increment of times
138! and counters,
139! calls of prognostic_equations_.. changed to .._noopt, .._cache, and
140! .._vector, these calls are now controlled by switch loop_optimization,
141! uxrp, vynp eliminated, 2nd+3rd argument removed from exchange horiz,
142! moisture renamed humidity
143!
144! RCS Log replace by Id keyword, revision history cleaned up
145!
146! Revision 1.8  2006/08/22 14:16:05  raasch
147! Disturbances are imposed only for the last Runge-Kutta-substep
148!
149! Revision 1.2  2004/04/30 13:03:40  raasch
150! decalpha-specific warning removed, routine name changed to time_integration,
151! particle advection is carried out only once during the intermediate steps,
152! impulse_advec renamed momentum_advec
153!
154! Revision 1.1  1997/08/11 06:19:04  raasch
155! Initial revision
156!
157!
158! Description:
159! ------------
160! Integration in time of the model equations, statistical analysis and graphic
161! output
162!------------------------------------------------------------------------------!
163
164    USE advec_ws
165    USE arrays_3d
166    USE averaging
167    USE buoyancy_mod
168    USE control_parameters
169    USE cpulog
170#if defined( __dvrp_graphics )
171    USE DVRP
172#endif
173    USE grid_variables
174    USE indices
175    USE interaction_droplets_ptq_mod
176    USE interfaces
177    USE ls_forcing_mod
178    USE particle_attributes
179    USE pegrid
180    USE production_e_mod
181    USE prognostic_equations_mod
182    USE statistics
183    USE user_actions_mod
184
185    IMPLICIT NONE
186
187    CHARACTER (LEN=9) ::  time_to_string
188
189!
190!-- At the beginning of a simulation determine the time step as well as
191!-- determine and print out the run control parameters
192    IF ( simulated_time == 0.0 )  CALL timestep
193
194    CALL run_control
195
196
197!
198!-- Data exchange between coupled models in case that a call has been omitted
199!-- at the end of the previous run of a job chain.
200    IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
201!
202!--    In case of model termination initiated by the local model the coupler
203!--    must not be called because this would again cause an MPI hang.
204       DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
205          CALL surface_coupler
206          time_coupling = time_coupling - dt_coupling
207       ENDDO
208       IF (time_coupling == 0.0 .AND. time_since_reference_point < dt_coupling)&
209       THEN
210          time_coupling = time_since_reference_point
211       ENDIF
212    ENDIF
213
214
215#if defined( __dvrp_graphics )
216!
217!-- Time measurement with dvrp software 
218    CALL DVRP_LOG_EVENT( 2, current_timestep_number )
219#endif
220
221!
222!-- Start of the time loop
223    DO  WHILE ( simulated_time < end_time  .AND.  .NOT. stop_dt  .AND. &
224                .NOT. terminate_run )
225
226       CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
227
228!
229!--    Determine size of next time step
230       IF ( simulated_time /= 0.0 )  THEN
231          CALL timestep
232       ENDIF
233
234!
235!--    Determine ug, vg and w_subs in dependence on data from external file
236!--    LSF_DATA
237       IF ( large_scale_forcing .AND. lsf_vert ) THEN
238           CALL ls_forcing_vert ( simulated_time )
239       ENDIF
240
241!
242!--    Execute the user-defined actions
243       CALL user_actions( 'before_timestep' )
244
245!
246!--    Start of intermediate step loop
247       intermediate_timestep_count = 0
248       DO  WHILE ( intermediate_timestep_count < &
249                   intermediate_timestep_count_max )
250
251          intermediate_timestep_count = intermediate_timestep_count + 1
252
253!
254!--       Set the steering factors for the prognostic equations which depend
255!--       on the timestep scheme
256          CALL timestep_scheme_steering
257
258!
259!--       Calculate those variables needed in the tendency terms which need
260!--       global communication
261          IF ( .NOT. use_single_reference_value  .AND. &
262               .NOT. use_initial_profile_as_reference )  THEN
263!
264!--          Horizontally averaged profiles to be used as reference state in
265!--          buoyancy terms (WARNING: only the respective last call of
266!--          calc_mean_profile defines the reference state!)
267             IF ( .NOT. neutral )  CALL calc_mean_profile( pt, 4, 'time_int' )
268             IF ( ocean         )  CALL calc_mean_profile( rho, 64, 'time_int' )
269             IF ( humidity      )  CALL calc_mean_profile( vpt, 44, 'time_int' )
270          ENDIF
271
272          IF ( .NOT. constant_diffusion )  CALL production_e_init
273          IF ( ( ws_scheme_mom .OR. ws_scheme_sca )  .AND.  &
274               intermediate_timestep_count == 1 )  CALL ws_statistics
275
276!
277!--       Solve the prognostic equations. A fast cache optimized version with
278!--       only one single loop is used in case of Piascek-Williams advection
279!--       scheme. NEC vector machines use a different version, because
280!--       in the other versions a good vectorization is prohibited due to
281!--       inlining problems.
282          IF ( loop_optimization == 'cache' )  THEN
283             CALL prognostic_equations_cache
284          ELSEIF ( loop_optimization == 'vector' )  THEN
285             CALL prognostic_equations_vector
286          ELSEIF ( loop_optimization == 'acc' )  THEN
287             i_left  = nxl;         i_right = nxr
288             j_south = nys;         j_north = nyn
289             CALL prognostic_equations_acc
290
291!             i_left  = nxl;         i_right = nxl+nbgp-1
292!             j_south = nys;         j_north = nyn
293!             CALL prognostic_equations_acc
294!             i_left  = nxr-nbgp+1;  i_right = nxr
295!             j_south = nys;         j_north = nyn
296!             CALL prognostic_equations_acc
297
298!
299!--          Exchange of ghost points (lateral boundary conditions)
300             IF ( background_communication )  THEN
301
302                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
303               
304                send_receive = 'lr'
305                sendrecv_in_background = .TRUE.
306                req          = 0
307                req_count    = 0
308
309                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
310                   on_device = .TRUE.         ! to be removed after complete porting
311                ELSE                          ! of ghost point exchange
312                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
313                ENDIF
314
315                CALL exchange_horiz( u_p, nbgp )
316                CALL exchange_horiz( v_p, nbgp )
317                CALL exchange_horiz( w_p, nbgp )
318                CALL exchange_horiz( pt_p, nbgp )
319                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
320                IF ( ocean )  THEN
321                   CALL exchange_horiz( sa_p, nbgp )
322                   CALL exchange_horiz( rho, nbgp )
323                  CALL exchange_horiz( prho, nbgp )
324                ENDIF
325                IF (humidity  .OR.  passive_scalar)  THEN
326                   CALL exchange_horiz( q_p, nbgp )
327                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
328                      CALL exchange_horiz( qr_p, nbgp )
329                      CALL exchange_horiz( nr_p, nbgp )
330                   ENDIF
331                ENDIF
332                IF ( cloud_droplets )  THEN
333                   CALL exchange_horiz( ql, nbgp )
334                   CALL exchange_horiz( ql_c, nbgp )
335                   CALL exchange_horiz( ql_v, nbgp )
336                   CALL exchange_horiz( ql_vp, nbgp )
337                ENDIF
338                IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
339
340                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
341                   on_device = .FALSE.        ! to be removed after complete porting
342                ELSE                          ! of ghost point exchange
343                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
344                ENDIF
345
346                sendrecv_in_background = .FALSE.
347
348                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
349
350             ENDIF
351
352!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
353!             j_south = nys;         j_north = nys+nbgp-1
354!             CALL prognostic_equations_acc
355!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
356!             j_south = nyn-nbgp+1;  j_north = nyn
357!             CALL prognostic_equations_acc
358
359             IF ( background_communication )  THEN
360                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
361#if defined( __parallel )
362                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
363#endif
364                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
365
366                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
367
368                send_receive = 'ns'
369                sendrecv_in_background = .TRUE.
370                req          = 0
371                req_count    = 0
372
373                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
374                   on_device = .TRUE.         ! to be removed after complete porting
375                ELSE                          ! of ghost point exchange
376                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
377                ENDIF
378
379                CALL exchange_horiz( u_p, nbgp )
380                CALL exchange_horiz( v_p, nbgp )
381                CALL exchange_horiz( w_p, nbgp )
382                CALL exchange_horiz( pt_p, nbgp )
383                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
384                IF ( ocean )  THEN
385                   CALL exchange_horiz( sa_p, nbgp )
386                   CALL exchange_horiz( rho, nbgp )
387                  CALL exchange_horiz( prho, nbgp )
388                ENDIF
389                IF (humidity  .OR.  passive_scalar)  THEN
390                   CALL exchange_horiz( q_p, nbgp )
391                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
392                      CALL exchange_horiz( qr_p, nbgp )
393                      CALL exchange_horiz( nr_p, nbgp )
394                   ENDIF
395                ENDIF
396                IF ( cloud_droplets )  THEN
397                   CALL exchange_horiz( ql, nbgp )
398                   CALL exchange_horiz( ql_c, nbgp )
399                   CALL exchange_horiz( ql_v, nbgp )
400                   CALL exchange_horiz( ql_vp, nbgp )
401                ENDIF
402                IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
403
404                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
405                   on_device = .FALSE.        ! to be removed after complete porting
406                ELSE                          ! of ghost point exchange
407                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
408                ENDIF
409
410                sendrecv_in_background = .FALSE.
411
412                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
413
414             ENDIF
415
416!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
417!             j_south = nys+nbgp;    j_north = nyn-nbgp
418!             CALL prognostic_equations_acc
419
420             IF ( background_communication )  THEN
421                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
422#if defined( __parallel )
423                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
424#endif
425                send_receive = 'al'
426                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
427             ENDIF
428
429          ENDIF
430
431!
432!--       Particle transport/physics with the Lagrangian particle model
433!--       (only once during intermediate steps, because it uses an Euler-step)
434!--       ### particle model should be moved before prognostic_equations, in order
435!--       to regard droplet interactions directly
436          IF ( particle_advection  .AND.                         &
437               simulated_time >= particle_advection_start  .AND. &
438               intermediate_timestep_count == 1 )  THEN
439             CALL lpm
440             first_call_lpm = .FALSE.
441          ENDIF
442
443!
444!--       Interaction of droplets with temperature and specific humidity.
445!--       Droplet condensation and evaporation is calculated within
446!--       advec_particles.
447          IF ( cloud_droplets  .AND.  &
448               intermediate_timestep_count == intermediate_timestep_count_max )&
449          THEN
450             CALL interaction_droplets_ptq
451          ENDIF
452
453!
454!--       Exchange of ghost points (lateral boundary conditions)
455          IF ( .NOT. background_communication )  THEN
456
457             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
458
459             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
460                on_device = .TRUE.         ! to be removed after complete porting
461             ELSE                          ! of ghost point exchange
462                !$acc update host( e_p, pt_p, u_p, v_p, w_p )
463             ENDIF
464
465             CALL exchange_horiz( u_p, nbgp )
466             CALL exchange_horiz( v_p, nbgp )
467             CALL exchange_horiz( w_p, nbgp )
468             CALL exchange_horiz( pt_p, nbgp )
469             IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
470             IF ( ocean )  THEN
471                CALL exchange_horiz( sa_p, nbgp )
472                CALL exchange_horiz( rho, nbgp )
473                CALL exchange_horiz( prho, nbgp )
474             ENDIF
475             IF (humidity  .OR.  passive_scalar)  THEN
476                CALL exchange_horiz( q_p, nbgp )
477                IF ( cloud_physics .AND. icloud_scheme == 0  .AND.  &
478                     precipitation )  THEN
479                   CALL exchange_horiz( qr_p, nbgp )
480                   CALL exchange_horiz( nr_p, nbgp )
481                ENDIF
482             ENDIF
483             IF ( cloud_droplets )  THEN
484                CALL exchange_horiz( ql, nbgp )
485                CALL exchange_horiz( ql_c, nbgp )
486                CALL exchange_horiz( ql_v, nbgp )
487                CALL exchange_horiz( ql_vp, nbgp )
488             ENDIF
489             IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
490
491             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
492                on_device = .FALSE.        ! to be removed after complete porting
493             ELSE                          ! of ghost point exchange
494                !$acc update device( e_p, pt_p, u_p, v_p, w_p )
495             ENDIF
496
497             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
498
499          ENDIF
500
501!
502!--       Boundary conditions for the prognostic quantities (except of the
503!--       velocities at the outflow in case of a non-cyclic lateral wall)
504          CALL boundary_conds
505
506!
507!--       Swap the time levels in preparation for the next time step.
508          CALL swap_timelevel
509
510!
511!--       Temperature offset must be imposed at cyclic boundaries in x-direction
512!--       when a sloping surface is used
513          IF ( sloping_surface )  THEN
514             IF ( nxl ==  0 )  pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
515                                                    pt_slope_offset
516             IF ( nxr == nx )  pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
517                                                    pt_slope_offset
518          ENDIF
519
520!
521!--       Impose a turbulent inflow using the recycling method
522          IF ( turbulent_inflow )  CALL  inflow_turbulence
523
524!
525!--       Impose a random perturbation on the horizontal velocity field
526          IF ( create_disturbances  .AND.                                      &
527               ( call_psolver_at_all_substeps  .AND.                           &
528               intermediate_timestep_count == intermediate_timestep_count_max )&
529          .OR. ( .NOT. call_psolver_at_all_substeps  .AND.                     &
530               intermediate_timestep_count == 1 ) )                            &
531          THEN
532             time_disturb = time_disturb + dt_3d
533             IF ( time_disturb >= dt_disturb )  THEN
534                !$acc update host( u, v )
535                IF ( numprocs == 1 )  on_device = .FALSE.  ! workaround, remove later
536                IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit )  THEN
537                   CALL disturb_field( nzb_u_inner, tend, u )
538                   CALL disturb_field( nzb_v_inner, tend, v )
539                ELSEIF ( .NOT. bc_lr_cyc  .OR.  .NOT. bc_ns_cyc )  THEN
540!
541!--                Runs with a non-cyclic lateral wall need perturbations
542!--                near the inflow throughout the whole simulation
543                   dist_range = 1
544                   CALL disturb_field( nzb_u_inner, tend, u )
545                   CALL disturb_field( nzb_v_inner, tend, v )
546                   dist_range = 0
547                ENDIF
548                IF ( numprocs == 1 )  on_device = .TRUE.  ! workaround, remove later
549                !$acc update device( u, v )
550                time_disturb = time_disturb - dt_disturb
551             ENDIF
552          ENDIF
553
554!
555!--       Reduce the velocity divergence via the equation for perturbation
556!--       pressure.
557          IF ( intermediate_timestep_count == 1  .OR. &
558                call_psolver_at_all_substeps )  THEN
559             CALL pres
560          ENDIF
561
562!
563!--       If required, compute liquid water content
564          IF ( cloud_physics )  THEN
565             CALL calc_liquid_water_content
566             !$acc update device( ql )
567          ENDIF
568!
569!--       If required, compute virtual potential temperature
570          IF ( humidity )  THEN
571             CALL compute_vpt 
572             !$acc update device( vpt )
573          ENDIF 
574!
575!--       Compute the diffusion quantities
576          IF ( .NOT. constant_diffusion )  THEN
577
578!
579!--          Determine surface fluxes shf and qsws and surface values
580!--          pt_surface and q_surface in dependence on data from external
581!--          file LSF_DATA respectively
582             IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
583                 intermediate_timestep_count == intermediate_timestep_count_max )&
584             THEN
585                CALL ls_forcing_surf ( simulated_time )
586             ENDIF
587
588!
589!--          First the vertical fluxes in the Prandtl layer are being computed
590             IF ( prandtl_layer )  THEN
591                CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
592                CALL prandtl_fluxes
593                CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
594             ENDIF
595
596!
597!--          Compute the diffusion coefficients
598             CALL cpu_log( log_point(17), 'diffusivities', 'start' )
599             IF ( .NOT. humidity ) THEN
600                IF ( ocean )  THEN
601                   CALL diffusivities( prho, prho_reference )
602                ELSE
603                   CALL diffusivities( pt, pt_reference )
604                ENDIF
605             ELSE
606                CALL diffusivities( vpt, pt_reference )
607             ENDIF
608             CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
609
610          ENDIF
611
612       ENDDO   ! Intermediate step loop
613
614!
615!--    Increase simulation time and output times
616       nr_timesteps_this_run      = nr_timesteps_this_run + 1
617       current_timestep_number    = current_timestep_number + 1
618       simulated_time             = simulated_time   + dt_3d
619       simulated_time_chr         = time_to_string( simulated_time )
620       time_since_reference_point = simulated_time - coupling_start_time
621
622       IF ( simulated_time >= skip_time_data_output_av )  THEN
623          time_do_av         = time_do_av       + dt_3d
624       ENDIF
625       IF ( simulated_time >= skip_time_do2d_xy )  THEN
626          time_do2d_xy       = time_do2d_xy     + dt_3d
627       ENDIF
628       IF ( simulated_time >= skip_time_do2d_xz )  THEN
629          time_do2d_xz       = time_do2d_xz     + dt_3d
630       ENDIF
631       IF ( simulated_time >= skip_time_do2d_yz )  THEN
632          time_do2d_yz       = time_do2d_yz     + dt_3d
633       ENDIF
634       IF ( simulated_time >= skip_time_do3d    )  THEN
635          time_do3d          = time_do3d        + dt_3d
636       ENDIF
637       DO  mid = 1, masks
638          IF ( simulated_time >= skip_time_domask(mid) )  THEN
639             time_domask(mid)= time_domask(mid) + dt_3d
640          ENDIF
641       ENDDO
642       time_dvrp          = time_dvrp        + dt_3d
643       IF ( simulated_time >= skip_time_dosp )  THEN
644          time_dosp       = time_dosp        + dt_3d
645       ENDIF
646       time_dots          = time_dots        + dt_3d
647       IF ( .NOT. first_call_lpm )  THEN
648          time_dopts      = time_dopts       + dt_3d
649       ENDIF
650       IF ( simulated_time >= skip_time_dopr )  THEN
651          time_dopr       = time_dopr        + dt_3d
652       ENDIF
653       time_dopr_listing          = time_dopr_listing        + dt_3d
654       time_run_control   = time_run_control + dt_3d
655
656!
657!--    Data exchange between coupled models
658       IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
659          time_coupling = time_coupling + dt_3d
660
661!
662!--       In case of model termination initiated by the local model
663!--       (terminate_coupled > 0), the coupler must be skipped because it would
664!--       cause an MPI intercomminucation hang.
665!--       If necessary, the coupler will be called at the beginning of the
666!--       next restart run.
667          DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
668             CALL surface_coupler
669             time_coupling = time_coupling - dt_coupling
670          ENDDO
671       ENDIF
672
673!
674!--    Execute user-defined actions
675       CALL user_actions( 'after_integration' )
676
677!
678!--    If Galilei transformation is used, determine the distance that the
679!--    model has moved so far
680       IF ( galilei_transformation )  THEN
681          advected_distance_x = advected_distance_x + u_gtrans * dt_3d
682          advected_distance_y = advected_distance_y + v_gtrans * dt_3d
683       ENDIF
684
685!
686!--    Check, if restart is necessary (because cpu-time is expiring or
687!--    because it is forced by user) and set stop flag
688!--    This call is skipped if the remote model has already initiated a restart.
689       IF ( .NOT. terminate_run )  CALL check_for_restart
690
691!
692!--    Carry out statistical analysis and output at the requested output times.
693!--    The MOD function is used for calculating the output time counters (like
694!--    time_dopr) in order to regard a possible decrease of the output time
695!--    interval in case of restart runs
696
697!
698!--    Set a flag indicating that so far no statistics have been created
699!--    for this time step
700       flow_statistics_called = .FALSE.
701
702!
703!--    If required, call flow_statistics for averaging in time
704       IF ( averaging_interval_pr /= 0.0  .AND.  &
705            ( dt_dopr - time_dopr ) <= averaging_interval_pr  .AND.  &
706            simulated_time >= skip_time_dopr )  THEN
707          time_dopr_av = time_dopr_av + dt_3d
708          IF ( time_dopr_av >= dt_averaging_input_pr )  THEN
709             do_sum = .TRUE.
710             time_dopr_av = MOD( time_dopr_av, &
711                                    MAX( dt_averaging_input_pr, dt_3d ) )
712          ENDIF
713       ENDIF
714       IF ( do_sum )  CALL flow_statistics
715
716!
717!--    Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
718       IF ( averaging_interval /= 0.0  .AND.                                &
719            ( dt_data_output_av - time_do_av ) <= averaging_interval  .AND. &
720            simulated_time >= skip_time_data_output_av )                    &
721       THEN
722          time_do_sla = time_do_sla + dt_3d
723          IF ( time_do_sla >= dt_averaging_input )  THEN
724             CALL sum_up_3d_data
725             average_count_3d = average_count_3d + 1
726             time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
727          ENDIF
728       ENDIF
729
730!
731!--    Calculate spectra for time averaging
732       IF ( averaging_interval_sp /= 0.0  .AND.  &
733            ( dt_dosp - time_dosp ) <= averaging_interval_sp  .AND.  &
734            simulated_time >= skip_time_dosp )  THEN
735          time_dosp_av = time_dosp_av + dt_3d
736          IF ( time_dosp_av >= dt_averaging_input_pr )  THEN
737             CALL calc_spectra
738             time_dosp_av = MOD( time_dosp_av, &
739                                 MAX( dt_averaging_input_pr, dt_3d ) )
740          ENDIF
741       ENDIF
742
743!
744!--    Computation and output of run control parameters.
745!--    This is also done whenever perturbations have been imposed
746       IF ( time_run_control >= dt_run_control  .OR.                     &
747            timestep_scheme(1:5) /= 'runge'  .OR.  disturbance_created ) &
748       THEN
749          CALL run_control
750          IF ( time_run_control >= dt_run_control )  THEN
751             time_run_control = MOD( time_run_control, &
752                                     MAX( dt_run_control, dt_3d ) )
753          ENDIF
754       ENDIF
755
756!
757!--    Profile output (ASCII) on file
758       IF ( time_dopr_listing >= dt_dopr_listing )  THEN
759          CALL print_1d
760          time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
761                                                           dt_3d ) )
762       ENDIF
763
764!
765!--    Graphic output for PROFIL
766       IF ( time_dopr >= dt_dopr )  THEN
767          IF ( dopr_n /= 0 )  CALL data_output_profiles
768          time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
769          time_dopr_av = 0.0    ! due to averaging (see above)
770       ENDIF
771
772!
773!--    Graphic output for time series
774       IF ( time_dots >= dt_dots )  THEN
775          CALL data_output_tseries
776          time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
777       ENDIF
778
779!
780!--    Output of spectra (formatted for use with PROFIL), in case of no
781!--    time averaging, spectra has to be calculated before
782       IF ( time_dosp >= dt_dosp )  THEN
783          IF ( average_count_sp == 0 )  CALL calc_spectra
784          CALL data_output_spectra
785          time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
786       ENDIF
787
788!
789!--    2d-data output (cross-sections)
790       IF ( time_do2d_xy >= dt_do2d_xy )  THEN
791          CALL data_output_2d( 'xy', 0 )
792          time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
793       ENDIF
794       IF ( time_do2d_xz >= dt_do2d_xz )  THEN
795          CALL data_output_2d( 'xz', 0 )
796          time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
797       ENDIF
798       IF ( time_do2d_yz >= dt_do2d_yz )  THEN
799          CALL data_output_2d( 'yz', 0 )
800          time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
801       ENDIF
802
803!
804!--    3d-data output (volume data)
805       IF ( time_do3d >= dt_do3d )  THEN
806          CALL data_output_3d( 0 )
807          time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
808       ENDIF
809
810!
811!--    masked data output
812       DO  mid = 1, masks
813          IF ( time_domask(mid) >= dt_domask(mid) )  THEN
814             CALL data_output_mask( 0 )
815             time_domask(mid) = MOD( time_domask(mid),  &
816                                     MAX( dt_domask(mid), dt_3d ) )
817          ENDIF
818       ENDDO
819
820!
821!--    Output of time-averaged 2d/3d/masked data
822       IF ( time_do_av >= dt_data_output_av )  THEN
823          CALL average_3d_data
824          CALL data_output_2d( 'xy', 1 )
825          CALL data_output_2d( 'xz', 1 )
826          CALL data_output_2d( 'yz', 1 )
827          CALL data_output_3d( 1 )
828          DO  mid = 1, masks
829             CALL data_output_mask( 1 )
830          ENDDO
831          time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
832       ENDIF
833
834!
835!--    Output of particle time series
836       IF ( particle_advection )  THEN
837          IF ( time_dopts >= dt_dopts  .OR. &
838               ( simulated_time >= particle_advection_start  .AND. &
839                 first_call_lpm ) )  THEN
840             CALL data_output_ptseries
841             time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
842          ENDIF
843       ENDIF
844
845!
846!--    Output of dvrp-graphics (isosurface, particles, slicer)
847#if defined( __dvrp_graphics )
848       CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
849#endif
850       IF ( time_dvrp >= dt_dvrp )  THEN
851          CALL data_output_dvrp
852          time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
853       ENDIF
854#if defined( __dvrp_graphics )
855       CALL DVRP_LOG_EVENT( 2, current_timestep_number )
856#endif
857
858!
859!--    If required, set the heat flux for the next time step at a random value
860       IF ( constant_heatflux  .AND.  random_heatflux )  CALL disturb_heatflux
861
862!
863!--    Execute user-defined actions
864       CALL user_actions( 'after_timestep' )
865
866       CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
867
868
869    ENDDO   ! time loop
870
871#if defined( __dvrp_graphics )
872    CALL DVRP_LOG_EVENT( -2, current_timestep_number )
873#endif
874
875 END SUBROUTINE time_integration
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