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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 1319 2014-03-17 15:08:44Z raasch $
27!
28! 1318 2014-03-17 13:35:16Z raasch
29! module interfaces removed
30!
31! 1308 2014-03-13 14:58:42Z fricke
32! +netcdf_data_format_save
33! For masked data, parallel netcdf output is not tested so far, hence
34! netcdf_data_format is switched back to non-paralell output.
35!
36! 1276 2014-01-15 13:40:41Z heinze
37! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
38!
39! 1257 2013-11-08 15:18:40Z raasch
40! acc-update-host directive for timestep removed
41!
42! 1241 2013-10-30 11:36:58Z heinze
43! Generalize calc_mean_profile for wider use
44! Determine shf and qsws in dependence on data from LSF_DATA
45! Determine ug and vg in dependence on data from LSF_DATA
46! 1221 2013-09-10 08:59:13Z raasch
47! host update of arrays before timestep is called
48!
49! 1179 2013-06-14 05:57:58Z raasch
50! mean profiles for reference state are only calculated if required,
51! small bugfix for background communication
52!
53! 1171 2013-05-30 11:27:45Z raasch
54! split of prognostic_equations deactivated (comment lines), for the time being
55!
56! 1128 2013-04-12 06:19:32Z raasch
57! asynchronous transfer of ghost point data realized for acc-optimized version:
58! prognostic_equations are first called two times for those points required for
59! the left-right and north-south exchange, respectively, and then for the
60! remaining points,
61! those parts requiring global communication moved from prognostic_equations to
62! here
63!
64! 1115 2013-03-26 18:16:16Z hoffmann
65! calculation of qr and nr is restricted to precipitation
66!
67! 1113 2013-03-10 02:48:14Z raasch
68! GPU-porting of boundary conditions,
69! openACC directives updated
70! formal parameter removed from routine boundary_conds
71!
72! 1111 2013-03-08 23:54:10Z raasch
73! +internal timestep counter for cpu statistics added,
74! openACC directives updated
75!
76! 1092 2013-02-02 11:24:22Z raasch
77! unused variables removed
78!
79! 1065 2012-11-22 17:42:36Z hoffmann
80! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
81!
82! 1053 2012-11-13 17:11:03Z hoffmann
83! exchange of ghost points for nr, qr added
84!
85! 1036 2012-10-22 13:43:42Z raasch
86! code put under GPL (PALM 3.9)
87!
88! 1019 2012-09-28 06:46:45Z raasch
89! non-optimized version of prognostic_equations removed
90!
91! 1015 2012-09-27 09:23:24Z raasch
92! +call of prognostic_equations_acc
93!
94! 1001 2012-09-13 14:08:46Z raasch
95! all actions concerning leapfrog- and upstream-spline-scheme removed
96!
97! 849 2012-03-15 10:35:09Z raasch
98! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
99!
100! 825 2012-02-19 03:03:44Z raasch
101! wang_collision_kernel renamed wang_kernel
102!
103! 790 2011-11-29 03:11:20Z raasch
104! exchange of ghostpoints for array diss
105!
106! 707 2011-03-29 11:39:40Z raasch
107! bc_lr/ns replaced by bc_lr/ns_cyc, calls of exchange_horiz are modified,
108! adaption to sloping surface
109!
110! 667  2010-12-23 12:06:00Z suehring/gryschka
111! Calls of exchange_horiz are modified.
112! Adaption to slooping surface.
113!
114! 449 2010-02-02 11:23:59Z raasch
115! Bugfix: exchange of ghost points for prho included
116!
117! 410 2009-12-04 17:05:40Z letzel
118! masked data output
119!
120! 388 2009-09-23 09:40:33Z raasch
121! Using prho instead of rho in diffusvities.
122! Coupling with independent precursor runs.
123! Bugfix: output of particle time series only if particle advection is switched
124!         on
125!
126! 151 2008-03-07 13:42:18Z raasch
127! inflow turbulence is imposed by calling new routine inflow_turbulence
128!
129! 108 2007-08-24 15:10:38Z letzel
130! Call of new routine surface_coupler,
131! presure solver is called after the first Runge-Kutta substep instead of the
132! last in case that call_psolver_at_all_substeps = .F.; for this case, the
133! random perturbation has to be added to the velocity fields also after the
134! first substep
135!
136! 97 2007-06-21 08:23:15Z raasch
137! diffusivities is called with argument rho in case of ocean runs,
138! new argument pt_/prho_reference in calls of diffusivities,
139! ghostpoint exchange for salinity and density
140!
141! 87 2007-05-22 15:46:47Z raasch
142! var_hom renamed pr_palm
143!
144! 75 2007-03-22 09:54:05Z raasch
145! Move call of user_actions( 'after_integration' ) below increment of times
146! and counters,
147! calls of prognostic_equations_.. changed to .._noopt, .._cache, and
148! .._vector, these calls are now controlled by switch loop_optimization,
149! uxrp, vynp eliminated, 2nd+3rd argument removed from exchange horiz,
150! moisture renamed humidity
151!
152! RCS Log replace by Id keyword, revision history cleaned up
153!
154! Revision 1.8  2006/08/22 14:16:05  raasch
155! Disturbances are imposed only for the last Runge-Kutta-substep
156!
157! Revision 1.2  2004/04/30 13:03:40  raasch
158! decalpha-specific warning removed, routine name changed to time_integration,
159! particle advection is carried out only once during the intermediate steps,
160! impulse_advec renamed momentum_advec
161!
162! Revision 1.1  1997/08/11 06:19:04  raasch
163! Initial revision
164!
165!
166! Description:
167! ------------
168! Integration in time of the model equations, statistical analysis and graphic
169! output
170!------------------------------------------------------------------------------!
171
172    USE advec_ws
173    USE arrays_3d
174    USE averaging
175    USE buoyancy_mod
176    USE control_parameters
177    USE cpulog
178#if defined( __dvrp_graphics )
179    USE DVRP
180#endif
181    USE grid_variables
182    USE indices
183    USE interaction_droplets_ptq_mod
184    USE ls_forcing_mod
185    USE particle_attributes
186    USE pegrid
187    USE production_e_mod
188    USE prognostic_equations_mod
189    USE statistics
190    USE user_actions_mod
191
192    IMPLICIT NONE
193
194    CHARACTER (LEN=9) ::  time_to_string
195    INTEGER           ::  netcdf_data_format_save
196
197!
198!-- At the beginning of a simulation determine the time step as well as
199!-- determine and print out the run control parameters
200    IF ( simulated_time == 0.0 )  CALL timestep
201
202    CALL run_control
203
204
205!
206!-- Data exchange between coupled models in case that a call has been omitted
207!-- at the end of the previous run of a job chain.
208    IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
209!
210!--    In case of model termination initiated by the local model the coupler
211!--    must not be called because this would again cause an MPI hang.
212       DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
213          CALL surface_coupler
214          time_coupling = time_coupling - dt_coupling
215       ENDDO
216       IF (time_coupling == 0.0 .AND. time_since_reference_point < dt_coupling)&
217       THEN
218          time_coupling = time_since_reference_point
219       ENDIF
220    ENDIF
221
222
223#if defined( __dvrp_graphics )
224!
225!-- Time measurement with dvrp software 
226    CALL DVRP_LOG_EVENT( 2, current_timestep_number )
227#endif
228
229!
230!-- Start of the time loop
231    DO  WHILE ( simulated_time < end_time  .AND.  .NOT. stop_dt  .AND. &
232                .NOT. terminate_run )
233
234       CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
235
236!
237!--    Determine size of next time step
238       IF ( simulated_time /= 0.0 )  THEN
239          CALL timestep
240       ENDIF
241
242!
243!--    Determine ug, vg and w_subs in dependence on data from external file
244!--    LSF_DATA
245       IF ( large_scale_forcing .AND. lsf_vert ) THEN
246           CALL ls_forcing_vert ( simulated_time )
247       ENDIF
248
249!
250!--    Execute the user-defined actions
251       CALL user_actions( 'before_timestep' )
252
253!
254!--    Start of intermediate step loop
255       intermediate_timestep_count = 0
256       DO  WHILE ( intermediate_timestep_count < &
257                   intermediate_timestep_count_max )
258
259          intermediate_timestep_count = intermediate_timestep_count + 1
260
261!
262!--       Set the steering factors for the prognostic equations which depend
263!--       on the timestep scheme
264          CALL timestep_scheme_steering
265
266!
267!--       Calculate those variables needed in the tendency terms which need
268!--       global communication
269          IF ( .NOT. use_single_reference_value  .AND. &
270               .NOT. use_initial_profile_as_reference )  THEN
271!
272!--          Horizontally averaged profiles to be used as reference state in
273!--          buoyancy terms (WARNING: only the respective last call of
274!--          calc_mean_profile defines the reference state!)
275             IF ( .NOT. neutral )  CALL calc_mean_profile( pt, 4, 'time_int' )
276             IF ( ocean         )  CALL calc_mean_profile( rho, 64, 'time_int' )
277             IF ( humidity      )  CALL calc_mean_profile( vpt, 44, 'time_int' )
278          ENDIF
279
280          IF ( .NOT. constant_diffusion )  CALL production_e_init
281          IF ( ( ws_scheme_mom .OR. ws_scheme_sca )  .AND.  &
282               intermediate_timestep_count == 1 )  CALL ws_statistics
283
284!
285!--       Solve the prognostic equations. A fast cache optimized version with
286!--       only one single loop is used in case of Piascek-Williams advection
287!--       scheme. NEC vector machines use a different version, because
288!--       in the other versions a good vectorization is prohibited due to
289!--       inlining problems.
290          IF ( loop_optimization == 'cache' )  THEN
291             CALL prognostic_equations_cache
292          ELSEIF ( loop_optimization == 'vector' )  THEN
293             CALL prognostic_equations_vector
294          ELSEIF ( loop_optimization == 'acc' )  THEN
295             i_left  = nxl;         i_right = nxr
296             j_south = nys;         j_north = nyn
297             CALL prognostic_equations_acc
298
299!             i_left  = nxl;         i_right = nxl+nbgp-1
300!             j_south = nys;         j_north = nyn
301!             CALL prognostic_equations_acc
302!             i_left  = nxr-nbgp+1;  i_right = nxr
303!             j_south = nys;         j_north = nyn
304!             CALL prognostic_equations_acc
305
306!
307!--          Exchange of ghost points (lateral boundary conditions)
308             IF ( background_communication )  THEN
309
310                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
311               
312                send_receive = 'lr'
313                sendrecv_in_background = .TRUE.
314                req          = 0
315                req_count    = 0
316
317                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
318                   on_device = .TRUE.         ! to be removed after complete porting
319                ELSE                          ! of ghost point exchange
320                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
321                ENDIF
322
323                CALL exchange_horiz( u_p, nbgp )
324                CALL exchange_horiz( v_p, nbgp )
325                CALL exchange_horiz( w_p, nbgp )
326                CALL exchange_horiz( pt_p, nbgp )
327                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
328                IF ( ocean )  THEN
329                   CALL exchange_horiz( sa_p, nbgp )
330                   CALL exchange_horiz( rho, nbgp )
331                  CALL exchange_horiz( prho, nbgp )
332                ENDIF
333                IF (humidity  .OR.  passive_scalar)  THEN
334                   CALL exchange_horiz( q_p, nbgp )
335                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
336                      CALL exchange_horiz( qr_p, nbgp )
337                      CALL exchange_horiz( nr_p, nbgp )
338                   ENDIF
339                ENDIF
340                IF ( cloud_droplets )  THEN
341                   CALL exchange_horiz( ql, nbgp )
342                   CALL exchange_horiz( ql_c, nbgp )
343                   CALL exchange_horiz( ql_v, nbgp )
344                   CALL exchange_horiz( ql_vp, nbgp )
345                ENDIF
346                IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
347
348                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
349                   on_device = .FALSE.        ! to be removed after complete porting
350                ELSE                          ! of ghost point exchange
351                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
352                ENDIF
353
354                sendrecv_in_background = .FALSE.
355
356                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
357
358             ENDIF
359
360!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
361!             j_south = nys;         j_north = nys+nbgp-1
362!             CALL prognostic_equations_acc
363!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
364!             j_south = nyn-nbgp+1;  j_north = nyn
365!             CALL prognostic_equations_acc
366
367             IF ( background_communication )  THEN
368                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
369#if defined( __parallel )
370                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
371#endif
372                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
373
374                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
375
376                send_receive = 'ns'
377                sendrecv_in_background = .TRUE.
378                req          = 0
379                req_count    = 0
380
381                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
382                   on_device = .TRUE.         ! to be removed after complete porting
383                ELSE                          ! of ghost point exchange
384                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
385                ENDIF
386
387                CALL exchange_horiz( u_p, nbgp )
388                CALL exchange_horiz( v_p, nbgp )
389                CALL exchange_horiz( w_p, nbgp )
390                CALL exchange_horiz( pt_p, nbgp )
391                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
392                IF ( ocean )  THEN
393                   CALL exchange_horiz( sa_p, nbgp )
394                   CALL exchange_horiz( rho, nbgp )
395                  CALL exchange_horiz( prho, nbgp )
396                ENDIF
397                IF (humidity  .OR.  passive_scalar)  THEN
398                   CALL exchange_horiz( q_p, nbgp )
399                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
400                      CALL exchange_horiz( qr_p, nbgp )
401                      CALL exchange_horiz( nr_p, nbgp )
402                   ENDIF
403                ENDIF
404                IF ( cloud_droplets )  THEN
405                   CALL exchange_horiz( ql, nbgp )
406                   CALL exchange_horiz( ql_c, nbgp )
407                   CALL exchange_horiz( ql_v, nbgp )
408                   CALL exchange_horiz( ql_vp, nbgp )
409                ENDIF
410                IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
411
412                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
413                   on_device = .FALSE.        ! to be removed after complete porting
414                ELSE                          ! of ghost point exchange
415                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
416                ENDIF
417
418                sendrecv_in_background = .FALSE.
419
420                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
421
422             ENDIF
423
424!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
425!             j_south = nys+nbgp;    j_north = nyn-nbgp
426!             CALL prognostic_equations_acc
427
428             IF ( background_communication )  THEN
429                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
430#if defined( __parallel )
431                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
432#endif
433                send_receive = 'al'
434                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
435             ENDIF
436
437          ENDIF
438
439!
440!--       Particle transport/physics with the Lagrangian particle model
441!--       (only once during intermediate steps, because it uses an Euler-step)
442!--       ### particle model should be moved before prognostic_equations, in order
443!--       to regard droplet interactions directly
444          IF ( particle_advection  .AND.                         &
445               simulated_time >= particle_advection_start  .AND. &
446               intermediate_timestep_count == 1 )  THEN
447             CALL lpm
448             first_call_lpm = .FALSE.
449          ENDIF
450
451!
452!--       Interaction of droplets with temperature and specific humidity.
453!--       Droplet condensation and evaporation is calculated within
454!--       advec_particles.
455          IF ( cloud_droplets  .AND.  &
456               intermediate_timestep_count == intermediate_timestep_count_max )&
457          THEN
458             CALL interaction_droplets_ptq
459          ENDIF
460
461!
462!--       Exchange of ghost points (lateral boundary conditions)
463          IF ( .NOT. background_communication )  THEN
464
465             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
466
467             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
468                on_device = .TRUE.         ! to be removed after complete porting
469             ELSE                          ! of ghost point exchange
470                !$acc update host( e_p, pt_p, u_p, v_p, w_p )
471             ENDIF
472
473             CALL exchange_horiz( u_p, nbgp )
474             CALL exchange_horiz( v_p, nbgp )
475             CALL exchange_horiz( w_p, nbgp )
476             CALL exchange_horiz( pt_p, nbgp )
477             IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
478             IF ( ocean )  THEN
479                CALL exchange_horiz( sa_p, nbgp )
480                CALL exchange_horiz( rho, nbgp )
481                CALL exchange_horiz( prho, nbgp )
482             ENDIF
483             IF (humidity  .OR.  passive_scalar)  THEN
484                CALL exchange_horiz( q_p, nbgp )
485                IF ( cloud_physics .AND. icloud_scheme == 0  .AND.  &
486                     precipitation )  THEN
487                   CALL exchange_horiz( qr_p, nbgp )
488                   CALL exchange_horiz( nr_p, nbgp )
489                ENDIF
490             ENDIF
491             IF ( cloud_droplets )  THEN
492                CALL exchange_horiz( ql, nbgp )
493                CALL exchange_horiz( ql_c, nbgp )
494                CALL exchange_horiz( ql_v, nbgp )
495                CALL exchange_horiz( ql_vp, nbgp )
496             ENDIF
497             IF ( wang_kernel  .OR.  turbulence )  CALL exchange_horiz( diss, nbgp )
498
499             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
500                on_device = .FALSE.        ! to be removed after complete porting
501             ELSE                          ! of ghost point exchange
502                !$acc update device( e_p, pt_p, u_p, v_p, w_p )
503             ENDIF
504
505             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
506
507          ENDIF
508
509!
510!--       Boundary conditions for the prognostic quantities (except of the
511!--       velocities at the outflow in case of a non-cyclic lateral wall)
512          CALL boundary_conds
513
514!
515!--       Swap the time levels in preparation for the next time step.
516          CALL swap_timelevel
517
518!
519!--       Temperature offset must be imposed at cyclic boundaries in x-direction
520!--       when a sloping surface is used
521          IF ( sloping_surface )  THEN
522             IF ( nxl ==  0 )  pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
523                                                    pt_slope_offset
524             IF ( nxr == nx )  pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
525                                                    pt_slope_offset
526          ENDIF
527
528!
529!--       Impose a turbulent inflow using the recycling method
530          IF ( turbulent_inflow )  CALL  inflow_turbulence
531
532!
533!--       Impose a random perturbation on the horizontal velocity field
534          IF ( create_disturbances  .AND.                                      &
535               ( call_psolver_at_all_substeps  .AND.                           &
536               intermediate_timestep_count == intermediate_timestep_count_max )&
537          .OR. ( .NOT. call_psolver_at_all_substeps  .AND.                     &
538               intermediate_timestep_count == 1 ) )                            &
539          THEN
540             time_disturb = time_disturb + dt_3d
541             IF ( time_disturb >= dt_disturb )  THEN
542                !$acc update host( u, v )
543                IF ( numprocs == 1 )  on_device = .FALSE.  ! workaround, remove later
544                IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit )  THEN
545                   CALL disturb_field( nzb_u_inner, tend, u )
546                   CALL disturb_field( nzb_v_inner, tend, v )
547                ELSEIF ( .NOT. bc_lr_cyc  .OR.  .NOT. bc_ns_cyc )  THEN
548!
549!--                Runs with a non-cyclic lateral wall need perturbations
550!--                near the inflow throughout the whole simulation
551                   dist_range = 1
552                   CALL disturb_field( nzb_u_inner, tend, u )
553                   CALL disturb_field( nzb_v_inner, tend, v )
554                   dist_range = 0
555                ENDIF
556                IF ( numprocs == 1 )  on_device = .TRUE.  ! workaround, remove later
557                !$acc update device( u, v )
558                time_disturb = time_disturb - dt_disturb
559             ENDIF
560          ENDIF
561
562!
563!--       Reduce the velocity divergence via the equation for perturbation
564!--       pressure.
565          IF ( intermediate_timestep_count == 1  .OR. &
566                call_psolver_at_all_substeps )  THEN
567             CALL pres
568          ENDIF
569
570!
571!--       If required, compute liquid water content
572          IF ( cloud_physics )  THEN
573             CALL calc_liquid_water_content
574             !$acc update device( ql )
575          ENDIF
576!
577!--       If required, compute virtual potential temperature
578          IF ( humidity )  THEN
579             CALL compute_vpt 
580             !$acc update device( vpt )
581          ENDIF 
582!
583!--       Compute the diffusion quantities
584          IF ( .NOT. constant_diffusion )  THEN
585
586!
587!--          Determine surface fluxes shf and qsws and surface values
588!--          pt_surface and q_surface in dependence on data from external
589!--          file LSF_DATA respectively
590             IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
591                 intermediate_timestep_count == intermediate_timestep_count_max )&
592             THEN
593                CALL ls_forcing_surf ( simulated_time )
594             ENDIF
595
596!
597!--          First the vertical fluxes in the Prandtl layer are being computed
598             IF ( prandtl_layer )  THEN
599                CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
600                CALL prandtl_fluxes
601                CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
602             ENDIF
603
604!
605!--          Compute the diffusion coefficients
606             CALL cpu_log( log_point(17), 'diffusivities', 'start' )
607             IF ( .NOT. humidity ) THEN
608                IF ( ocean )  THEN
609                   CALL diffusivities( prho, prho_reference )
610                ELSE
611                   CALL diffusivities( pt, pt_reference )
612                ENDIF
613             ELSE
614                CALL diffusivities( vpt, pt_reference )
615             ENDIF
616             CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
617
618          ENDIF
619
620       ENDDO   ! Intermediate step loop
621
622!
623!--    Increase simulation time and output times
624       nr_timesteps_this_run      = nr_timesteps_this_run + 1
625       current_timestep_number    = current_timestep_number + 1
626       simulated_time             = simulated_time   + dt_3d
627       simulated_time_chr         = time_to_string( simulated_time )
628       time_since_reference_point = simulated_time - coupling_start_time
629
630       IF ( simulated_time >= skip_time_data_output_av )  THEN
631          time_do_av         = time_do_av       + dt_3d
632       ENDIF
633       IF ( simulated_time >= skip_time_do2d_xy )  THEN
634          time_do2d_xy       = time_do2d_xy     + dt_3d
635       ENDIF
636       IF ( simulated_time >= skip_time_do2d_xz )  THEN
637          time_do2d_xz       = time_do2d_xz     + dt_3d
638       ENDIF
639       IF ( simulated_time >= skip_time_do2d_yz )  THEN
640          time_do2d_yz       = time_do2d_yz     + dt_3d
641       ENDIF
642       IF ( simulated_time >= skip_time_do3d    )  THEN
643          time_do3d          = time_do3d        + dt_3d
644       ENDIF
645       DO  mid = 1, masks
646          IF ( simulated_time >= skip_time_domask(mid) )  THEN
647             time_domask(mid)= time_domask(mid) + dt_3d
648          ENDIF
649       ENDDO
650       time_dvrp          = time_dvrp        + dt_3d
651       IF ( simulated_time >= skip_time_dosp )  THEN
652          time_dosp       = time_dosp        + dt_3d
653       ENDIF
654       time_dots          = time_dots        + dt_3d
655       IF ( .NOT. first_call_lpm )  THEN
656          time_dopts      = time_dopts       + dt_3d
657       ENDIF
658       IF ( simulated_time >= skip_time_dopr )  THEN
659          time_dopr       = time_dopr        + dt_3d
660       ENDIF
661       time_dopr_listing          = time_dopr_listing        + dt_3d
662       time_run_control   = time_run_control + dt_3d
663
664!
665!--    Data exchange between coupled models
666       IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
667          time_coupling = time_coupling + dt_3d
668
669!
670!--       In case of model termination initiated by the local model
671!--       (terminate_coupled > 0), the coupler must be skipped because it would
672!--       cause an MPI intercomminucation hang.
673!--       If necessary, the coupler will be called at the beginning of the
674!--       next restart run.
675          DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
676             CALL surface_coupler
677             time_coupling = time_coupling - dt_coupling
678          ENDDO
679       ENDIF
680
681!
682!--    Execute user-defined actions
683       CALL user_actions( 'after_integration' )
684
685!
686!--    If Galilei transformation is used, determine the distance that the
687!--    model has moved so far
688       IF ( galilei_transformation )  THEN
689          advected_distance_x = advected_distance_x + u_gtrans * dt_3d
690          advected_distance_y = advected_distance_y + v_gtrans * dt_3d
691       ENDIF
692
693!
694!--    Check, if restart is necessary (because cpu-time is expiring or
695!--    because it is forced by user) and set stop flag
696!--    This call is skipped if the remote model has already initiated a restart.
697       IF ( .NOT. terminate_run )  CALL check_for_restart
698
699!
700!--    Carry out statistical analysis and output at the requested output times.
701!--    The MOD function is used for calculating the output time counters (like
702!--    time_dopr) in order to regard a possible decrease of the output time
703!--    interval in case of restart runs
704
705!
706!--    Set a flag indicating that so far no statistics have been created
707!--    for this time step
708       flow_statistics_called = .FALSE.
709
710!
711!--    If required, call flow_statistics for averaging in time
712       IF ( averaging_interval_pr /= 0.0  .AND.  &
713            ( dt_dopr - time_dopr ) <= averaging_interval_pr  .AND.  &
714            simulated_time >= skip_time_dopr )  THEN
715          time_dopr_av = time_dopr_av + dt_3d
716          IF ( time_dopr_av >= dt_averaging_input_pr )  THEN
717             do_sum = .TRUE.
718             time_dopr_av = MOD( time_dopr_av, &
719                                    MAX( dt_averaging_input_pr, dt_3d ) )
720          ENDIF
721       ENDIF
722       IF ( do_sum )  CALL flow_statistics
723
724!
725!--    Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
726       IF ( averaging_interval /= 0.0  .AND.                                &
727            ( dt_data_output_av - time_do_av ) <= averaging_interval  .AND. &
728            simulated_time >= skip_time_data_output_av )                    &
729       THEN
730          time_do_sla = time_do_sla + dt_3d
731          IF ( time_do_sla >= dt_averaging_input )  THEN
732             CALL sum_up_3d_data
733             average_count_3d = average_count_3d + 1
734             time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
735          ENDIF
736       ENDIF
737
738!
739!--    Calculate spectra for time averaging
740       IF ( averaging_interval_sp /= 0.0  .AND.  &
741            ( dt_dosp - time_dosp ) <= averaging_interval_sp  .AND.  &
742            simulated_time >= skip_time_dosp )  THEN
743          time_dosp_av = time_dosp_av + dt_3d
744          IF ( time_dosp_av >= dt_averaging_input_pr )  THEN
745             CALL calc_spectra
746             time_dosp_av = MOD( time_dosp_av, &
747                                 MAX( dt_averaging_input_pr, dt_3d ) )
748          ENDIF
749       ENDIF
750
751!
752!--    Computation and output of run control parameters.
753!--    This is also done whenever perturbations have been imposed
754       IF ( time_run_control >= dt_run_control  .OR.                     &
755            timestep_scheme(1:5) /= 'runge'  .OR.  disturbance_created ) &
756       THEN
757          CALL run_control
758          IF ( time_run_control >= dt_run_control )  THEN
759             time_run_control = MOD( time_run_control, &
760                                     MAX( dt_run_control, dt_3d ) )
761          ENDIF
762       ENDIF
763
764!
765!--    Profile output (ASCII) on file
766       IF ( time_dopr_listing >= dt_dopr_listing )  THEN
767          CALL print_1d
768          time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
769                                                           dt_3d ) )
770       ENDIF
771
772!
773!--    Graphic output for PROFIL
774       IF ( time_dopr >= dt_dopr )  THEN
775          IF ( dopr_n /= 0 )  CALL data_output_profiles
776          time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
777          time_dopr_av = 0.0    ! due to averaging (see above)
778       ENDIF
779
780!
781!--    Graphic output for time series
782       IF ( time_dots >= dt_dots )  THEN
783          CALL data_output_tseries
784          time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
785       ENDIF
786
787!
788!--    Output of spectra (formatted for use with PROFIL), in case of no
789!--    time averaging, spectra has to be calculated before
790       IF ( time_dosp >= dt_dosp )  THEN
791          IF ( average_count_sp == 0 )  CALL calc_spectra
792          CALL data_output_spectra
793          time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
794       ENDIF
795
796!
797!--    2d-data output (cross-sections)
798       IF ( time_do2d_xy >= dt_do2d_xy )  THEN
799          CALL data_output_2d( 'xy', 0 )
800          time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
801       ENDIF
802       IF ( time_do2d_xz >= dt_do2d_xz )  THEN
803          CALL data_output_2d( 'xz', 0 )
804          time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
805       ENDIF
806       IF ( time_do2d_yz >= dt_do2d_yz )  THEN
807          CALL data_output_2d( 'yz', 0 )
808          time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
809       ENDIF
810
811!
812!--    3d-data output (volume data)
813       IF ( time_do3d >= dt_do3d )  THEN
814          CALL data_output_3d( 0 )
815          time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
816       ENDIF
817
818!
819!--    masked data output
820!--    Parallel netcdf output is not tested so far for masked data, hence
821!--    netcdf_data_format is switched back to non-paralell output.
822       netcdf_data_format_save = netcdf_data_format
823       IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
824       IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
825       DO  mid = 1, masks
826          IF ( time_domask(mid) >= dt_domask(mid) )  THEN
827             CALL data_output_mask( 0 )
828             time_domask(mid) = MOD( time_domask(mid),  &
829                                     MAX( dt_domask(mid), dt_3d ) )
830          ENDIF
831       ENDDO
832       netcdf_data_format = netcdf_data_format_save
833
834!
835!--    Output of time-averaged 2d/3d/masked data
836       IF ( time_do_av >= dt_data_output_av )  THEN
837          CALL average_3d_data
838          CALL data_output_2d( 'xy', 1 )
839          CALL data_output_2d( 'xz', 1 )
840          CALL data_output_2d( 'yz', 1 )
841          CALL data_output_3d( 1 )
842!--       Parallel netcdf output is not tested so far for masked data, hence
843!--       netcdf_data_format is switched back to non-paralell output.
844          netcdf_data_format_save = netcdf_data_format
845          IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
846          IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
847          DO  mid = 1, masks
848             CALL data_output_mask( 1 )
849          ENDDO
850          netcdf_data_format = netcdf_data_format_save
851          time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
852       ENDIF
853
854!
855!--    Output of particle time series
856       IF ( particle_advection )  THEN
857          IF ( time_dopts >= dt_dopts  .OR. &
858               ( simulated_time >= particle_advection_start  .AND. &
859                 first_call_lpm ) )  THEN
860             CALL data_output_ptseries
861             time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
862          ENDIF
863       ENDIF
864
865!
866!--    Output of dvrp-graphics (isosurface, particles, slicer)
867#if defined( __dvrp_graphics )
868       CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
869#endif
870       IF ( time_dvrp >= dt_dvrp )  THEN
871          CALL data_output_dvrp
872          time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
873       ENDIF
874#if defined( __dvrp_graphics )
875       CALL DVRP_LOG_EVENT( 2, current_timestep_number )
876#endif
877
878!
879!--    If required, set the heat flux for the next time step at a random value
880       IF ( constant_heatflux  .AND.  random_heatflux )  CALL disturb_heatflux
881
882!
883!--    Execute user-defined actions
884       CALL user_actions( 'after_timestep' )
885
886       CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
887
888
889    ENDDO   ! time loop
890
891#if defined( __dvrp_graphics )
892    CALL DVRP_LOG_EVENT( -2, current_timestep_number )
893#endif
894
895 END SUBROUTINE time_integration
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