source: palm/trunk/SOURCE/time_integration.f90 @ 1765

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1!> @file time_integration.f90
2!--------------------------------------------------------------------------------!
3! This file is part of PALM.
4!
5! PALM is free software: you can redistribute it and/or modify it under the terms
6! of the GNU General Public License as published by the Free Software Foundation,
7! either version 3 of the License, or (at your option) any later version.
8!
9! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
12!
13! You should have received a copy of the GNU General Public License along with
14! PALM. If not, see <http://www.gnu.org/licenses/>.
15!
16! Copyright 1997-2015 Leibniz Universitaet Hannover
17!--------------------------------------------------------------------------------!
18!
19! Current revisions:
20! ------------------
21!
22!
23! Former revisions:
24! -----------------
25! $Id: time_integration.f90 1765 2016-02-28 13:30:40Z raasch $
26!
27! 1764 2016-02-28 12:45:19Z raasch
28! PMC_ACTIVE flags removed,
29! bugfix: nest synchronization after first call of timestep
30!
31! 1762 2016-02-25 12:31:13Z hellstea
32! Introduction of nested domain feature
33!
34! 1736 2015-12-04 08:56:33Z raasch
35! no perturbations added to total domain if energy limit has been set zero
36!
37! 1691 2015-10-26 16:17:44Z maronga
38! Added option for spin-ups without land surface and radiation models. Moved calls
39! for radiation and lan surface schemes.
40!
41! 1682 2015-10-07 23:56:08Z knoop
42! Code annotations made doxygen readable
43!
44! 1671 2015-09-25 03:29:37Z raasch
45! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
46! for particles
47!
48! 1585 2015-04-30 07:05:52Z maronga
49! Moved call of radiation scheme. Added support for RRTM
50!
51! 1551 2015-03-03 14:18:16Z maronga
52! Added interface for different radiation schemes.
53!
54! 1496 2014-12-02 17:25:50Z maronga
55! Added calls for the land surface model and radiation scheme
56!
57! 1402 2014-05-09 14:25:13Z raasch
58! location messages modified
59!
60! 1384 2014-05-02 14:31:06Z raasch
61! location messages added
62!
63! 1380 2014-04-28 12:40:45Z heinze
64! CALL of nudge_ref added
65! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
66!
67! 1365 2014-04-22 15:03:56Z boeske
68! Reset sums_ls_l to zero at each timestep
69! +sums_ls_l
70! Calculation of reference state (previously in subroutine calc_mean_profile)
71
72! 1342 2014-03-26 17:04:47Z kanani
73! REAL constants defined as wp-kind
74!
75! 1320 2014-03-20 08:40:49Z raasch
76! ONLY-attribute added to USE-statements,
77! kind-parameters added to all INTEGER and REAL declaration statements,
78! kinds are defined in new module kinds,
79! old module precision_kind is removed,
80! revision history before 2012 removed,
81! comment fields (!:) to be used for variable explanations added to
82! all variable declaration statements
83! 1318 2014-03-17 13:35:16Z raasch
84! module interfaces removed
85!
86! 1308 2014-03-13 14:58:42Z fricke
87! +netcdf_data_format_save
88! For masked data, parallel netcdf output is not tested so far, hence
89! netcdf_data_format is switched back to non-paralell output.
90!
91! 1276 2014-01-15 13:40:41Z heinze
92! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
93!
94! 1257 2013-11-08 15:18:40Z raasch
95! acc-update-host directive for timestep removed
96!
97! 1241 2013-10-30 11:36:58Z heinze
98! Generalize calc_mean_profile for wider use
99! Determine shf and qsws in dependence on data from LSF_DATA
100! Determine ug and vg in dependence on data from LSF_DATA
101! 1221 2013-09-10 08:59:13Z raasch
102! host update of arrays before timestep is called
103!
104! 1179 2013-06-14 05:57:58Z raasch
105! mean profiles for reference state are only calculated if required,
106! small bugfix for background communication
107!
108! 1171 2013-05-30 11:27:45Z raasch
109! split of prognostic_equations deactivated (comment lines), for the time being
110!
111! 1128 2013-04-12 06:19:32Z raasch
112! asynchronous transfer of ghost point data realized for acc-optimized version:
113! prognostic_equations are first called two times for those points required for
114! the left-right and north-south exchange, respectively, and then for the
115! remaining points,
116! those parts requiring global communication moved from prognostic_equations to
117! here
118!
119! 1115 2013-03-26 18:16:16Z hoffmann
120! calculation of qr and nr is restricted to precipitation
121!
122! 1113 2013-03-10 02:48:14Z raasch
123! GPU-porting of boundary conditions,
124! openACC directives updated
125! formal parameter removed from routine boundary_conds
126!
127! 1111 2013-03-08 23:54:10Z raasch
128! +internal timestep counter for cpu statistics added,
129! openACC directives updated
130!
131! 1092 2013-02-02 11:24:22Z raasch
132! unused variables removed
133!
134! 1065 2012-11-22 17:42:36Z hoffmann
135! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
136!
137! 1053 2012-11-13 17:11:03Z hoffmann
138! exchange of ghost points for nr, qr added
139!
140! 1036 2012-10-22 13:43:42Z raasch
141! code put under GPL (PALM 3.9)
142!
143! 1019 2012-09-28 06:46:45Z raasch
144! non-optimized version of prognostic_equations removed
145!
146! 1015 2012-09-27 09:23:24Z raasch
147! +call of prognostic_equations_acc
148!
149! 1001 2012-09-13 14:08:46Z raasch
150! all actions concerning leapfrog- and upstream-spline-scheme removed
151!
152! 849 2012-03-15 10:35:09Z raasch
153! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
154!
155! 825 2012-02-19 03:03:44Z raasch
156! wang_collision_kernel renamed wang_kernel
157!
158! Revision 1.1  1997/08/11 06:19:04  raasch
159! Initial revision
160!
161!
162! Description:
163! ------------
164!> Integration in time of the model equations, statistical analysis and graphic
165!> output
166!------------------------------------------------------------------------------!
167 SUBROUTINE time_integration
168 
169
170    USE advec_ws,                                                              &
171        ONLY:  ws_statistics
172
173    USE arrays_3d,                                                             &
174        ONLY:  diss, dzu, e, e_p, nr_p, prho, pt, pt_p, pt_init, q_init, q,    &
175               ql, ql_c, ql_v, ql_vp, qr_p, q_p, ref_state, rho, sa_p, tend,   &
176               u, u_p, v, vpt, v_p, w, w_p
177
178    USE calc_mean_profile_mod,                                                 &
179        ONLY:  calc_mean_profile
180
181    USE control_parameters,                                                    &
182        ONLY:  advected_distance_x, advected_distance_y, average_count_3d,     &
183               average_count_sp, averaging_interval, averaging_interval_pr,    &
184               averaging_interval_sp, bc_lr_cyc, bc_ns_cyc, bc_pt_t_val,       &
185               bc_q_t_val, call_psolver_at_all_substeps, cloud_droplets,       &
186               cloud_physics, constant_flux_layer, constant_heatflux,          &
187               create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
188               coupling_start_time, current_timestep_number,                   &
189               disturbance_created, disturbance_energy_limit, dist_range,      &
190               do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr,       &
191               dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy,         &
192               dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr,   &
193               dt_dopr_listing, dt_dosp, dt_dots, dt_dvrp, dt_run_control,     &
194               end_time, first_call_lpm, galilei_transformation, humidity,     &
195               icloud_scheme, intermediate_timestep_count,                     &
196               intermediate_timestep_count_max, large_scale_forcing,           &
197               loop_optimization, lsf_surf, lsf_vert, masks, mid, nest_domain, &
198               netcdf_data_format, neutral, nr_timesteps_this_run, nudging,    &
199               ocean, on_device, passive_scalar, precipitation,                &
200               prho_reference, pt_reference, pt_slope_offset, random_heatflux, &
201               run_coupled, simulated_time, simulated_time_chr,                &
202               skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz,        &
203               skip_time_do3d, skip_time_domask, skip_time_dopr,               &
204               skip_time_dosp, skip_time_data_output_av, sloping_surface,      &
205               stop_dt, terminate_coupled, terminate_run, timestep_scheme,     &
206               time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz,        &
207               time_do3d, time_domask, time_dopr, time_dopr_av,                &
208               time_dopr_listing, time_dopts, time_dosp, time_dosp_av,         &
209               time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp,    &
210               time_run_control, time_since_reference_point,                   &
211               turbulence,                                                     &
212               turbulent_inflow, use_initial_profile_as_reference,             &
213               use_single_reference_value, u_gtrans, v_gtrans, ws_scheme_mom,  &
214               ws_scheme_sca
215
216    USE cpulog,                                                                &
217        ONLY:  cpu_log, log_point, log_point_s
218
219    USE indices,                                                               &
220        ONLY:  i_left, i_right, j_north, j_south, nbgp, nx, nxl, nxlg, nxr,    &
221               nxrg, nyn, nys, nzb, nzt, nzb_u_inner, nzb_v_inner
222
223    USE interaction_droplets_ptq_mod,                                          &
224        ONLY:  interaction_droplets_ptq
225
226    USE kinds
227
228    USE land_surface_model_mod,                                                &
229        ONLY:  land_surface, lsm_energy_balance, lsm_soil_model,               &
230               skip_time_do_lsm
231
232    USE ls_forcing_mod,                                                        &
233        ONLY:  ls_forcing_surf, ls_forcing_vert
234
235    USE nudge_mod,                                                             &
236        ONLY:  calc_tnudge, nudge_ref
237
238    USE particle_attributes,                                                   &
239        ONLY:  particle_advection, particle_advection_start,                   &
240               use_sgs_for_particles, wang_kernel
241
242    USE pegrid
243
244    USE pmc_interface,                                                         &
245        ONLY:  client_to_server, nested_run, nesting_mode,                     &
246               pmci_ensure_nest_mass_conservation, pmci_client_datatrans,      &
247               pmci_client_initialize, pmci_client_synchronize,                &
248               pmci_server_datatrans, pmci_server_initialize,                  &
249               pmci_server_synchronize, pmci_update_new, server_to_client
250
251    USE production_e_mod,                                                      &
252        ONLY:  production_e_init
253
254    USE progress_bar,                                                          &
255        ONLY:  finish_progress_bar, output_progress_bar
256
257    USE prognostic_equations_mod,                                              &
258        ONLY:  prognostic_equations_acc, prognostic_equations_cache,           &
259               prognostic_equations_vector
260
261    USE radiation_model_mod,                                                   &
262        ONLY: dt_radiation, force_radiation_call, radiation,                   &
263              radiation_clearsky, radiation_rrtmg, radiation_scheme,           &
264              skip_time_do_radiation, time_radiation
265
266    USE statistics,                                                            &
267        ONLY:  flow_statistics_called, hom, pr_palm, sums_ls_l
268
269    USE surface_layer_fluxes_mod,                                              &
270        ONLY:  surface_layer_fluxes
271
272    USE user_actions_mod,                                                      &
273        ONLY:  user_actions
274
275    IMPLICIT NONE
276
277    CHARACTER (LEN=9) ::  time_to_string          !<
278
279    INTEGER(iwp)      ::  netcdf_data_format_save !<
280
281!
282!-- At the beginning of a simulation determine the time step as well as
283!-- determine and print out the run control parameters
284    IF ( simulated_time == 0.0_wp )  CALL timestep
285
286!
287!-- Synchronize the timestep in case of nested run.
288!-- The server side must be called first
289    IF ( nested_run )  THEN
290       CALL pmci_server_synchronize
291       CALL pmci_client_synchronize
292    ENDIF
293
294    CALL run_control
295
296!
297!-- Data exchange between coupled models in case that a call has been omitted
298!-- at the end of the previous run of a job chain.
299    IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
300!
301!--    In case of model termination initiated by the local model the coupler
302!--    must not be called because this would again cause an MPI hang.
303       DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
304          CALL surface_coupler
305          time_coupling = time_coupling - dt_coupling
306       ENDDO
307       IF (time_coupling == 0.0_wp .AND. time_since_reference_point < dt_coupling)&
308       THEN
309          time_coupling = time_since_reference_point
310       ENDIF
311    ENDIF
312
313    IF ( nested_run )  THEN
314!
315!--    TO_DO: try to give more meaningful comments here
316!--    Domain nesting: From server to client commmunication
317!--    ( direction=SERVER_TO_CLIENT )
318!--    Nest initial conditions
319!
320!--    Send initial condition data from server to client
321       CALL pmci_server_initialize
322!
323!--    Receive and interpolate initial data on client
324       CALL pmci_client_initialize
325!
326!--    TO_DO, maybe removed
327!--    Obs. Nesting may be unnecessary at this point.
328!
329!--    Nest boundary conditions
330       CALL pmci_server_datatrans( server_to_client )
331       CALL pmci_client_datatrans( server_to_client )
332
333       IF ( nesting_mode == 'two-way' )  THEN
334          CALL pmci_server_datatrans( client_to_server )
335          CALL pmci_client_datatrans( client_to_server )
336!
337!--       Exchange_horiz is needed for all server-domains after the anterpolation
338          CALL exchange_horiz( u, nbgp )
339          CALL exchange_horiz( v, nbgp )
340          CALL exchange_horiz( w, nbgp )
341          CALL exchange_horiz( pt, nbgp )
342          IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e, nbgp )
343          intermediate_timestep_count = 0
344          CALL pres
345       ENDIF
346!
347!--    Correct the w top-BC in nest domains to ensure mass conservation.
348!--    Copy the interpolated/anterpolated boundary values to the _p
349!--    arrays, too, to make sure the interpolated/anterpolated boundary
350!--    values are carried over from one RK inner step to another.
351!--    These actions must not be done for the root domain.
352       IF ( nest_domain )  THEN
353          CALL pmci_ensure_nest_mass_conservation
354          CALL pmci_update_new
355       ENDIF
356
357    ENDIF
358
359#if defined( __dvrp_graphics )
360!
361!-- Time measurement with dvrp software 
362    CALL DVRP_LOG_EVENT( 2, current_timestep_number )
363#endif
364
365    CALL location_message( 'start with time-stepping', .TRUE. )
366!
367!-- Start of the time loop
368    DO  WHILE ( simulated_time < end_time  .AND.  .NOT. stop_dt  .AND. &
369                .NOT. terminate_run )
370
371       CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
372
373!
374!--    Determine size of next time step
375       IF ( simulated_time /= 0.0_wp )  THEN
376          CALL timestep
377
378          IF ( nested_run )  THEN
379!
380!--          TO_DO: try to give more detailed and meaningful comments here
381!--          Server side must be called first
382             CALL pmci_server_synchronize
383             CALL pmci_client_synchronize
384          ENDIF
385       ENDIF
386
387
388!
389!--    Determine ug, vg and w_subs in dependence on data from external file
390!--    LSF_DATA
391       IF ( large_scale_forcing .AND. lsf_vert )  THEN
392           CALL ls_forcing_vert ( simulated_time )
393           sums_ls_l = 0.0_wp
394       ENDIF
395
396!
397!--    Set pt_init and q_init to the current profiles taken from
398!--    NUDGING_DATA
399       IF ( nudging )  THEN
400           CALL nudge_ref ( simulated_time )
401!
402!--        Store temperature gradient at the top boundary for possible Neumann
403!--        boundary condition
404           bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
405           bc_q_t_val  = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
406       ENDIF
407
408!
409!--    Execute the user-defined actions
410       CALL user_actions( 'before_timestep' )
411
412!
413!--    Start of intermediate step loop
414       intermediate_timestep_count = 0
415       DO  WHILE ( intermediate_timestep_count < &
416                   intermediate_timestep_count_max )
417
418          intermediate_timestep_count = intermediate_timestep_count + 1
419
420!
421!--       Set the steering factors for the prognostic equations which depend
422!--       on the timestep scheme
423          CALL timestep_scheme_steering
424
425!
426!--       Calculate those variables needed in the tendency terms which need
427!--       global communication
428          IF ( .NOT. use_single_reference_value  .AND. &
429               .NOT. use_initial_profile_as_reference )  THEN
430!
431!--          Horizontally averaged profiles to be used as reference state in
432!--          buoyancy terms (WARNING: only the respective last call of
433!--          calc_mean_profile defines the reference state!)
434             IF ( .NOT. neutral )  THEN
435                CALL calc_mean_profile( pt, 4 )
436                ref_state(:)  = hom(:,1,4,0) ! this is used in the buoyancy term
437             ENDIF
438             IF ( ocean )  THEN
439                CALL calc_mean_profile( rho, 64 )
440                ref_state(:)  = hom(:,1,64,0)
441             ENDIF
442             IF ( humidity )  THEN
443                CALL calc_mean_profile( vpt, 44 )
444                ref_state(:)  = hom(:,1,44,0)
445             ENDIF
446
447          ENDIF
448
449          IF ( .NOT. constant_diffusion )  CALL production_e_init
450          IF ( ( ws_scheme_mom .OR. ws_scheme_sca )  .AND.  &
451               intermediate_timestep_count == 1 )  CALL ws_statistics
452!
453!--       In case of nudging calculate current nudging time scale and horizontal
454!--       means of u, v, pt and q
455          IF ( nudging )  THEN
456             CALL calc_tnudge( simulated_time )
457             CALL calc_mean_profile( u, 1 )
458             CALL calc_mean_profile( v, 2 )
459             CALL calc_mean_profile( pt, 4 )
460             CALL calc_mean_profile( q, 41 )
461          ENDIF
462
463!
464!--       Solve the prognostic equations. A fast cache optimized version with
465!--       only one single loop is used in case of Piascek-Williams advection
466!--       scheme. NEC vector machines use a different version, because
467!--       in the other versions a good vectorization is prohibited due to
468!--       inlining problems.
469          IF ( loop_optimization == 'cache' )  THEN
470             CALL prognostic_equations_cache
471          ELSEIF ( loop_optimization == 'vector' )  THEN
472             CALL prognostic_equations_vector
473          ELSEIF ( loop_optimization == 'acc' )  THEN
474             i_left  = nxl;         i_right = nxr
475             j_south = nys;         j_north = nyn
476             CALL prognostic_equations_acc
477
478!             i_left  = nxl;         i_right = nxl+nbgp-1
479!             j_south = nys;         j_north = nyn
480!             CALL prognostic_equations_acc
481!             i_left  = nxr-nbgp+1;  i_right = nxr
482!             j_south = nys;         j_north = nyn
483!             CALL prognostic_equations_acc
484
485!
486!--          Exchange of ghost points (lateral boundary conditions)
487             IF ( background_communication )  THEN
488
489                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
490               
491                send_receive = 'lr'
492                sendrecv_in_background = .TRUE.
493                req          = 0
494                req_count    = 0
495
496                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
497                   on_device = .TRUE.         ! to be removed after complete porting
498                ELSE                          ! of ghost point exchange
499                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
500                ENDIF
501
502                CALL exchange_horiz( u_p, nbgp )
503                CALL exchange_horiz( v_p, nbgp )
504                CALL exchange_horiz( w_p, nbgp )
505                CALL exchange_horiz( pt_p, nbgp )
506                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
507                IF ( ocean )  THEN
508                   CALL exchange_horiz( sa_p, nbgp )
509                   CALL exchange_horiz( rho, nbgp )
510                  CALL exchange_horiz( prho, nbgp )
511                ENDIF
512                IF (humidity  .OR.  passive_scalar)  THEN
513                   CALL exchange_horiz( q_p, nbgp )
514                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
515                      CALL exchange_horiz( qr_p, nbgp )
516                      CALL exchange_horiz( nr_p, nbgp )
517                   ENDIF
518                ENDIF
519                IF ( cloud_droplets )  THEN
520                   CALL exchange_horiz( ql, nbgp )
521                   CALL exchange_horiz( ql_c, nbgp )
522                   CALL exchange_horiz( ql_v, nbgp )
523                   CALL exchange_horiz( ql_vp, nbgp )
524                ENDIF
525                IF ( wang_kernel  .OR.  turbulence  .OR.  use_sgs_for_particles ) &
526                THEN
527                   CALL exchange_horiz( diss, nbgp )
528                ENDIF
529
530                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
531                   on_device = .FALSE.        ! to be removed after complete porting
532                ELSE                          ! of ghost point exchange
533                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
534                ENDIF
535
536                sendrecv_in_background = .FALSE.
537
538                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'pause' )
539
540             ENDIF
541
542!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
543!             j_south = nys;         j_north = nys+nbgp-1
544!             CALL prognostic_equations_acc
545!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
546!             j_south = nyn-nbgp+1;  j_north = nyn
547!             CALL prognostic_equations_acc
548
549             IF ( background_communication )  THEN
550                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'start' )
551#if defined( __parallel )
552                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
553#endif
554                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'pause' )
555
556                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'continue' )
557
558                send_receive = 'ns'
559                sendrecv_in_background = .TRUE.
560                req          = 0
561                req_count    = 0
562
563                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
564                   on_device = .TRUE.         ! to be removed after complete porting
565                ELSE                          ! of ghost point exchange
566                   !$acc update host( e_p, pt_p, u_p, v_p, w_p )
567                ENDIF
568
569                CALL exchange_horiz( u_p, nbgp )
570                CALL exchange_horiz( v_p, nbgp )
571                CALL exchange_horiz( w_p, nbgp )
572                CALL exchange_horiz( pt_p, nbgp )
573                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
574                IF ( ocean )  THEN
575                   CALL exchange_horiz( sa_p, nbgp )
576                   CALL exchange_horiz( rho, nbgp )
577                  CALL exchange_horiz( prho, nbgp )
578                ENDIF
579                IF (humidity  .OR.  passive_scalar)  THEN
580                   CALL exchange_horiz( q_p, nbgp )
581                   IF ( cloud_physics .AND. icloud_scheme == 0 )  THEN
582                      CALL exchange_horiz( qr_p, nbgp )
583                      CALL exchange_horiz( nr_p, nbgp )
584                   ENDIF
585                ENDIF
586                IF ( cloud_droplets )  THEN
587                   CALL exchange_horiz( ql, nbgp )
588                   CALL exchange_horiz( ql_c, nbgp )
589                   CALL exchange_horiz( ql_v, nbgp )
590                   CALL exchange_horiz( ql_vp, nbgp )
591                ENDIF
592                IF ( wang_kernel  .OR.  turbulence  .OR.  use_sgs_for_particles ) &
593                THEN
594                   CALL exchange_horiz( diss, nbgp )
595                ENDIF
596
597                IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
598                   on_device = .FALSE.        ! to be removed after complete porting
599                ELSE                          ! of ghost point exchange
600                   !$acc update device( e_p, pt_p, u_p, v_p, w_p )
601                ENDIF
602
603                sendrecv_in_background = .FALSE.
604
605                CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
606
607             ENDIF
608
609!             i_left  = nxl+nbgp;    i_right = nxr-nbgp
610!             j_south = nys+nbgp;    j_north = nyn-nbgp
611!             CALL prognostic_equations_acc
612
613             IF ( background_communication )  THEN
614                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'continue' )
615#if defined( __parallel )
616                CALL MPI_WAITALL( req_count, req, wait_stat, ierr )
617#endif
618                send_receive = 'al'
619                CALL cpu_log( log_point(41), 'exchange-horiz-wait', 'stop' )
620             ENDIF
621
622          ENDIF
623
624!
625!--       Particle transport/physics with the Lagrangian particle model
626!--       (only once during intermediate steps, because it uses an Euler-step)
627!--       ### particle model should be moved before prognostic_equations, in order
628!--       to regard droplet interactions directly
629          IF ( particle_advection  .AND.                         &
630               simulated_time >= particle_advection_start  .AND. &
631               intermediate_timestep_count == 1 )  THEN
632             CALL lpm
633             first_call_lpm = .FALSE.
634          ENDIF
635
636!
637!--       Interaction of droplets with temperature and specific humidity.
638!--       Droplet condensation and evaporation is calculated within
639!--       advec_particles.
640          IF ( cloud_droplets  .AND.  &
641               intermediate_timestep_count == intermediate_timestep_count_max )&
642          THEN
643             CALL interaction_droplets_ptq
644          ENDIF
645
646!
647!--       Exchange of ghost points (lateral boundary conditions)
648          IF ( .NOT. background_communication )  THEN
649
650             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
651
652             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
653                on_device = .TRUE.         ! to be removed after complete porting
654             ELSE                          ! of ghost point exchange
655                !$acc update host( e_p, pt_p, u_p, v_p, w_p )
656             ENDIF
657
658             CALL exchange_horiz( u_p, nbgp )
659             CALL exchange_horiz( v_p, nbgp )
660             CALL exchange_horiz( w_p, nbgp )
661             CALL exchange_horiz( pt_p, nbgp )
662             IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
663             IF ( ocean )  THEN
664                CALL exchange_horiz( sa_p, nbgp )
665                CALL exchange_horiz( rho, nbgp )
666                CALL exchange_horiz( prho, nbgp )
667             ENDIF
668             IF (humidity  .OR.  passive_scalar)  THEN
669                CALL exchange_horiz( q_p, nbgp )
670                IF ( cloud_physics .AND. icloud_scheme == 0  .AND.  &
671                     precipitation )  THEN
672                   CALL exchange_horiz( qr_p, nbgp )
673                   CALL exchange_horiz( nr_p, nbgp )
674                ENDIF
675             ENDIF
676             IF ( cloud_droplets )  THEN
677                CALL exchange_horiz( ql, nbgp )
678                CALL exchange_horiz( ql_c, nbgp )
679                CALL exchange_horiz( ql_v, nbgp )
680                CALL exchange_horiz( ql_vp, nbgp )
681             ENDIF
682             IF ( wang_kernel  .OR.  turbulence  .OR.  use_sgs_for_particles ) &
683             THEN
684                CALL exchange_horiz( diss, nbgp )
685             ENDIF
686
687             IF ( numprocs == 1 )  THEN    ! workaround for single-core GPU runs
688                on_device = .FALSE.        ! to be removed after complete porting
689             ELSE                          ! of ghost point exchange
690                !$acc update device( e_p, pt_p, u_p, v_p, w_p )
691             ENDIF
692
693             CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
694
695          ENDIF
696
697!
698!--       Boundary conditions for the prognostic quantities (except of the
699!--       velocities at the outflow in case of a non-cyclic lateral wall)
700          CALL boundary_conds
701
702!
703!--       Swap the time levels in preparation for the next time step.
704          CALL swap_timelevel
705
706          IF ( nested_run )  THEN
707!
708!--          TO_DO: try to give more meaningful comments here
709!--          Domain nesting
710!--          Note that the nesting operations are omitted intentionally on the
711!--          first two RK-substeps.
712             CALL cpu_log( log_point(60), 'nesting', 'start' )
713!
714!--          From server to client commmunication ( direction=SERVER_TO_CLIENT )
715             CALL pmci_server_datatrans( server_to_client )
716             CALL pmci_client_datatrans( server_to_client )
717
718             IF ( nesting_mode == 'two-way' )  THEN
719!
720!--             From client to server commmunication ( direction=CLIENT_TO_SERVER )
721                CALL pmci_server_datatrans( client_to_server )
722                CALL pmci_client_datatrans( client_to_server )
723!
724!--             Exchange_horiz is needed for all server-domains after the
725!--             anterpolation
726                CALL exchange_horiz( u, nbgp )
727                CALL exchange_horiz( v, nbgp )
728                CALL exchange_horiz( w, nbgp )
729                CALL exchange_horiz( pt, nbgp )
730                IF ( humidity  .OR.  passive_scalar )  THEN
731                   CALL exchange_horiz( q, nbgp )
732                ENDIF
733                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e, nbgp )
734             ENDIF
735!
736!--          Correct the w top-BC in nest domains to ensure mass conservation.
737!--          This action must never be done for the root domain.
738             IF ( nest_domain )  THEN
739                CALL pmci_ensure_nest_mass_conservation
740!
741!--             pmc_update_new is not necessary if nesting is made at each
742!--             substep
743                CALL pmci_update_new
744             ENDIF
745
746             CALL cpu_log( log_point(60), 'nesting', 'stop' )
747
748          ENDIF
749
750!
751!--       Temperature offset must be imposed at cyclic boundaries in x-direction
752!--       when a sloping surface is used
753          IF ( sloping_surface )  THEN
754             IF ( nxl ==  0 )  pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
755                                                    pt_slope_offset
756             IF ( nxr == nx )  pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
757                                                    pt_slope_offset
758          ENDIF
759
760!
761!--       Impose a turbulent inflow using the recycling method
762          IF ( turbulent_inflow )  CALL  inflow_turbulence
763
764!
765!--       Impose a random perturbation on the horizontal velocity field
766          IF ( create_disturbances  .AND.                                      &
767               ( call_psolver_at_all_substeps  .AND.                           &
768               intermediate_timestep_count == intermediate_timestep_count_max )&
769          .OR. ( .NOT. call_psolver_at_all_substeps  .AND.                     &
770               intermediate_timestep_count == 1 ) )                            &
771          THEN
772             time_disturb = time_disturb + dt_3d
773             IF ( time_disturb >= dt_disturb )  THEN
774                !$acc update host( u, v )
775                IF ( numprocs == 1 )  on_device = .FALSE.  ! workaround, remove later
776                IF ( disturbance_energy_limit /= 0.0_wp  .AND.                 &
777                     hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit )  THEN
778                   CALL disturb_field( nzb_u_inner, tend, u )
779                   CALL disturb_field( nzb_v_inner, tend, v )
780                ELSEIF ( .NOT. bc_lr_cyc  .OR.  .NOT. bc_ns_cyc )  THEN
781!
782!--                Runs with a non-cyclic lateral wall need perturbations
783!--                near the inflow throughout the whole simulation
784                   dist_range = 1
785                   CALL disturb_field( nzb_u_inner, tend, u )
786                   CALL disturb_field( nzb_v_inner, tend, v )
787                   dist_range = 0
788                ENDIF
789                IF ( numprocs == 1 )  on_device = .TRUE.  ! workaround, remove later
790                !$acc update device( u, v )
791                time_disturb = time_disturb - dt_disturb
792             ENDIF
793          ENDIF
794
795!
796!--       Reduce the velocity divergence via the equation for perturbation
797!--       pressure.
798          IF ( intermediate_timestep_count == 1  .OR. &
799                call_psolver_at_all_substeps )  THEN
800             CALL pres
801          ENDIF
802
803!
804!--       If required, compute liquid water content
805          IF ( cloud_physics )  THEN
806             CALL calc_liquid_water_content
807             !$acc update device( ql )
808          ENDIF
809!
810!--       If required, compute virtual potential temperature
811          IF ( humidity )  THEN
812             CALL compute_vpt
813             !$acc update device( vpt )
814          ENDIF
815
816!
817!--       Compute the diffusion quantities
818          IF ( .NOT. constant_diffusion )  THEN
819
820!
821!--          Determine surface fluxes shf and qsws and surface values
822!--          pt_surface and q_surface in dependence on data from external
823!--          file LSF_DATA respectively
824             IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
825                 intermediate_timestep_count == intermediate_timestep_count_max )&
826             THEN
827                CALL ls_forcing_surf ( simulated_time )
828             ENDIF
829
830!
831!--          First the vertical fluxes in the surface (constant flux) layer are computed
832             IF ( constant_flux_layer )  THEN
833                CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
834                CALL surface_layer_fluxes
835                CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
836             ENDIF
837
838!
839!--          If required, solve the energy balance for the surface and run soil
840!--          model
841             IF ( land_surface .AND. simulated_time > skip_time_do_lsm)  THEN
842
843                CALL cpu_log( log_point(54), 'land_surface', 'start' )
844                CALL lsm_energy_balance
845                CALL lsm_soil_model
846                CALL cpu_log( log_point(54), 'land_surface', 'stop' )
847             ENDIF
848!
849!--          Compute the diffusion coefficients
850             CALL cpu_log( log_point(17), 'diffusivities', 'start' )
851             IF ( .NOT. humidity ) THEN
852                IF ( ocean )  THEN
853                   CALL diffusivities( prho, prho_reference )
854                ELSE
855                   CALL diffusivities( pt, pt_reference )
856                ENDIF
857             ELSE
858                CALL diffusivities( vpt, pt_reference )
859             ENDIF
860             CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
861
862          ENDIF
863
864!
865!--       If required, calculate radiative fluxes and heating rates
866          IF ( radiation .AND. intermediate_timestep_count                     &
867               == intermediate_timestep_count_max .AND. simulated_time >    &
868               skip_time_do_radiation )  THEN
869
870               time_radiation = time_radiation + dt_3d
871
872             IF ( time_radiation >= dt_radiation .OR. force_radiation_call )   &
873             THEN
874
875                CALL cpu_log( log_point(50), 'radiation', 'start' )
876
877                IF ( .NOT. force_radiation_call )  THEN
878                   time_radiation = time_radiation - dt_radiation
879                ELSE
880                   WRITE(9,*) "Unscheduled radiation call at ", simulated_time
881                   CALL LOCAL_FLUSH ( 9 )
882                ENDIF
883
884                IF ( radiation_scheme == 'clear-sky' )  THEN
885                   CALL radiation_clearsky
886                ELSEIF ( radiation_scheme == 'rrtmg' )  THEN
887                   CALL radiation_rrtmg
888                ENDIF
889
890                CALL cpu_log( log_point(50), 'radiation', 'stop' )
891             ENDIF
892          ENDIF
893
894       ENDDO   ! Intermediate step loop
895
896!
897!--    Increase simulation time and output times
898       nr_timesteps_this_run      = nr_timesteps_this_run + 1
899       current_timestep_number    = current_timestep_number + 1
900       simulated_time             = simulated_time   + dt_3d
901       simulated_time_chr         = time_to_string( simulated_time )
902       time_since_reference_point = simulated_time - coupling_start_time
903
904       IF ( simulated_time >= skip_time_data_output_av )  THEN
905          time_do_av         = time_do_av       + dt_3d
906       ENDIF
907       IF ( simulated_time >= skip_time_do2d_xy )  THEN
908          time_do2d_xy       = time_do2d_xy     + dt_3d
909       ENDIF
910       IF ( simulated_time >= skip_time_do2d_xz )  THEN
911          time_do2d_xz       = time_do2d_xz     + dt_3d
912       ENDIF
913       IF ( simulated_time >= skip_time_do2d_yz )  THEN
914          time_do2d_yz       = time_do2d_yz     + dt_3d
915       ENDIF
916       IF ( simulated_time >= skip_time_do3d    )  THEN
917          time_do3d          = time_do3d        + dt_3d
918       ENDIF
919       DO  mid = 1, masks
920          IF ( simulated_time >= skip_time_domask(mid) )  THEN
921             time_domask(mid)= time_domask(mid) + dt_3d
922          ENDIF
923       ENDDO
924       time_dvrp          = time_dvrp        + dt_3d
925       IF ( simulated_time >= skip_time_dosp )  THEN
926          time_dosp       = time_dosp        + dt_3d
927       ENDIF
928       time_dots          = time_dots        + dt_3d
929       IF ( .NOT. first_call_lpm )  THEN
930          time_dopts      = time_dopts       + dt_3d
931       ENDIF
932       IF ( simulated_time >= skip_time_dopr )  THEN
933          time_dopr       = time_dopr        + dt_3d
934       ENDIF
935       time_dopr_listing          = time_dopr_listing        + dt_3d
936       time_run_control   = time_run_control + dt_3d
937
938!
939!--    Data exchange between coupled models
940       IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled )  THEN
941          time_coupling = time_coupling + dt_3d
942
943!
944!--       In case of model termination initiated by the local model
945!--       (terminate_coupled > 0), the coupler must be skipped because it would
946!--       cause an MPI intercomminucation hang.
947!--       If necessary, the coupler will be called at the beginning of the
948!--       next restart run.
949          DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
950             CALL surface_coupler
951             time_coupling = time_coupling - dt_coupling
952          ENDDO
953       ENDIF
954
955!
956!--    Execute user-defined actions
957       CALL user_actions( 'after_integration' )
958
959!
960!--    If Galilei transformation is used, determine the distance that the
961!--    model has moved so far
962       IF ( galilei_transformation )  THEN
963          advected_distance_x = advected_distance_x + u_gtrans * dt_3d
964          advected_distance_y = advected_distance_y + v_gtrans * dt_3d
965       ENDIF
966
967!
968!--    Check, if restart is necessary (because cpu-time is expiring or
969!--    because it is forced by user) and set stop flag
970!--    This call is skipped if the remote model has already initiated a restart.
971       IF ( .NOT. terminate_run )  CALL check_for_restart
972
973!
974!--    Carry out statistical analysis and output at the requested output times.
975!--    The MOD function is used for calculating the output time counters (like
976!--    time_dopr) in order to regard a possible decrease of the output time
977!--    interval in case of restart runs
978
979!
980!--    Set a flag indicating that so far no statistics have been created
981!--    for this time step
982       flow_statistics_called = .FALSE.
983
984!
985!--    If required, call flow_statistics for averaging in time
986       IF ( averaging_interval_pr /= 0.0_wp  .AND.  &
987            ( dt_dopr - time_dopr ) <= averaging_interval_pr  .AND.  &
988            simulated_time >= skip_time_dopr )  THEN
989          time_dopr_av = time_dopr_av + dt_3d
990          IF ( time_dopr_av >= dt_averaging_input_pr )  THEN
991             do_sum = .TRUE.
992             time_dopr_av = MOD( time_dopr_av, &
993                                    MAX( dt_averaging_input_pr, dt_3d ) )
994          ENDIF
995       ENDIF
996       IF ( do_sum )  CALL flow_statistics
997
998!
999!--    Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1000       IF ( averaging_interval /= 0.0_wp  .AND.                                &
1001            ( dt_data_output_av - time_do_av ) <= averaging_interval  .AND. &
1002            simulated_time >= skip_time_data_output_av )                    &
1003       THEN
1004          time_do_sla = time_do_sla + dt_3d
1005          IF ( time_do_sla >= dt_averaging_input )  THEN
1006             CALL sum_up_3d_data
1007             average_count_3d = average_count_3d + 1
1008             time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1009          ENDIF
1010       ENDIF
1011
1012!
1013!--    Calculate spectra for time averaging
1014       IF ( averaging_interval_sp /= 0.0_wp  .AND.  &
1015            ( dt_dosp - time_dosp ) <= averaging_interval_sp  .AND.  &
1016            simulated_time >= skip_time_dosp )  THEN
1017          time_dosp_av = time_dosp_av + dt_3d
1018          IF ( time_dosp_av >= dt_averaging_input_pr )  THEN
1019             CALL calc_spectra
1020             time_dosp_av = MOD( time_dosp_av, &
1021                                 MAX( dt_averaging_input_pr, dt_3d ) )
1022          ENDIF
1023       ENDIF
1024
1025!
1026!--    Computation and output of run control parameters.
1027!--    This is also done whenever perturbations have been imposed
1028       IF ( time_run_control >= dt_run_control  .OR.                     &
1029            timestep_scheme(1:5) /= 'runge'  .OR.  disturbance_created ) &
1030       THEN
1031          CALL run_control
1032          IF ( time_run_control >= dt_run_control )  THEN
1033             time_run_control = MOD( time_run_control, &
1034                                     MAX( dt_run_control, dt_3d ) )
1035          ENDIF
1036       ENDIF
1037
1038!
1039!--    Profile output (ASCII) on file
1040       IF ( time_dopr_listing >= dt_dopr_listing )  THEN
1041          CALL print_1d
1042          time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1043                                                           dt_3d ) )
1044       ENDIF
1045
1046!
1047!--    Graphic output for PROFIL
1048       IF ( time_dopr >= dt_dopr )  THEN
1049          IF ( dopr_n /= 0 )  CALL data_output_profiles
1050          time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1051          time_dopr_av = 0.0_wp    ! due to averaging (see above)
1052       ENDIF
1053
1054!
1055!--    Graphic output for time series
1056       IF ( time_dots >= dt_dots )  THEN
1057          CALL data_output_tseries
1058          time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1059       ENDIF
1060
1061!
1062!--    Output of spectra (formatted for use with PROFIL), in case of no
1063!--    time averaging, spectra has to be calculated before
1064       IF ( time_dosp >= dt_dosp )  THEN
1065          IF ( average_count_sp == 0 )  CALL calc_spectra
1066          CALL data_output_spectra
1067          time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1068       ENDIF
1069
1070!
1071!--    2d-data output (cross-sections)
1072       IF ( time_do2d_xy >= dt_do2d_xy )  THEN
1073          CALL data_output_2d( 'xy', 0 )
1074          time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1075       ENDIF
1076       IF ( time_do2d_xz >= dt_do2d_xz )  THEN
1077          CALL data_output_2d( 'xz', 0 )
1078          time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1079       ENDIF
1080       IF ( time_do2d_yz >= dt_do2d_yz )  THEN
1081          CALL data_output_2d( 'yz', 0 )
1082          time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1083       ENDIF
1084
1085!
1086!--    3d-data output (volume data)
1087       IF ( time_do3d >= dt_do3d )  THEN
1088          CALL data_output_3d( 0 )
1089          time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1090       ENDIF
1091
1092!
1093!--    masked data output
1094!--    Parallel netcdf output is not tested so far for masked data, hence
1095!--    netcdf_data_format is switched back to non-paralell output.
1096       netcdf_data_format_save = netcdf_data_format
1097       IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1098       IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1099       DO  mid = 1, masks
1100          IF ( time_domask(mid) >= dt_domask(mid) )  THEN
1101             CALL data_output_mask( 0 )
1102             time_domask(mid) = MOD( time_domask(mid),  &
1103                                     MAX( dt_domask(mid), dt_3d ) )
1104          ENDIF
1105       ENDDO
1106       netcdf_data_format = netcdf_data_format_save
1107
1108!
1109!--    Output of time-averaged 2d/3d/masked data
1110       IF ( time_do_av >= dt_data_output_av )  THEN
1111          CALL average_3d_data
1112          CALL data_output_2d( 'xy', 1 )
1113          CALL data_output_2d( 'xz', 1 )
1114          CALL data_output_2d( 'yz', 1 )
1115          CALL data_output_3d( 1 )
1116!--       Parallel netcdf output is not tested so far for masked data, hence
1117!--       netcdf_data_format is switched back to non-paralell output.
1118          netcdf_data_format_save = netcdf_data_format
1119          IF ( netcdf_data_format == 5 ) netcdf_data_format = 3
1120          IF ( netcdf_data_format == 6 ) netcdf_data_format = 4
1121          DO  mid = 1, masks
1122             CALL data_output_mask( 1 )
1123          ENDDO
1124          netcdf_data_format = netcdf_data_format_save
1125          time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1126       ENDIF
1127
1128!
1129!--    Output of particle time series
1130       IF ( particle_advection )  THEN
1131          IF ( time_dopts >= dt_dopts  .OR. &
1132               ( simulated_time >= particle_advection_start  .AND. &
1133                 first_call_lpm ) )  THEN
1134             CALL data_output_ptseries
1135             time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1136          ENDIF
1137       ENDIF
1138
1139!
1140!--    Output of dvrp-graphics (isosurface, particles, slicer)
1141#if defined( __dvrp_graphics )
1142       CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1143#endif
1144       IF ( time_dvrp >= dt_dvrp )  THEN
1145          CALL data_output_dvrp
1146          time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1147       ENDIF
1148#if defined( __dvrp_graphics )
1149       CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1150#endif
1151
1152!
1153!--    If required, set the heat flux for the next time step at a random value
1154       IF ( constant_heatflux  .AND.  random_heatflux )  CALL disturb_heatflux
1155
1156!
1157!--    Execute user-defined actions
1158       CALL user_actions( 'after_timestep' )
1159
1160!
1161!--    Output elapsed simulated time in form of a progress bar on stdout
1162       IF ( myid == 0 )  CALL output_progress_bar
1163
1164       CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1165
1166
1167    ENDDO   ! time loop
1168
1169    IF ( myid == 0 )  CALL finish_progress_bar
1170
1171#if defined( __dvrp_graphics )
1172    CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1173#endif
1174
1175    CALL location_message( 'finished time-stepping', .TRUE. )
1176
1177 END SUBROUTINE time_integration
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