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1	SUBROUTINE time_integration
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	! Calls of exchange_horiz are modified.
7	! Adaption to slooping surface.
8	!
9	! Former revisions:
10	! -----------------
11	! $Id: time_integration.f90 668 2010-12-23 13:22:58Z gryschka $
12	!
13	! 667 2010-12-23 12:06:00Z suehring/gryschka
14	! Calls of exchange_horiz are modified.
15	! Adaption to slooping surface.
16	!
17	! 449 2010-02-02 11:23:59Z raasch
18	! Bugfix: exchange of ghost points for prho included
19	!
20	! 410 2009-12-04 17:05:40Z letzel
21	! masked data output
22	!
23	! 388 2009-09-23 09:40:33Z raasch
24	! Using prho instead of rho in diffusvities.
25	! Coupling with independent precursor runs.
26	! Bugfix: output of particle time series only if particle advection is switched
27	! on
28	!
29	! 151 2008-03-07 13:42:18Z raasch
30	! inflow turbulence is imposed by calling new routine inflow_turbulence
31	!
32	! 108 2007-08-24 15:10:38Z letzel
33	! Call of new routine surface_coupler,
34	! presure solver is called after the first Runge-Kutta substep instead of the
35	! last in case that call_psolver_at_all_substeps = .F.; for this case, the
36	! random perturbation has to be added to the velocity fields also after the
37	! first substep
38	!
39	! 97 2007-06-21 08:23:15Z raasch
40	! diffusivities is called with argument rho in case of ocean runs,
41	! new argument pt_/prho_reference in calls of diffusivities,
42	! ghostpoint exchange for salinity and density
43	!
44	! 87 2007-05-22 15:46:47Z raasch
45	! var_hom renamed pr_palm
46	!
47	! 75 2007-03-22 09:54:05Z raasch
48	! Move call of user_actions( 'after_integration' ) below increment of times
49	! and counters,
50	! calls of prognostic_equations_.. changed to .._noopt, .._cache, and
51	! .._vector, these calls are now controlled by switch loop_optimization,
52	! uxrp, vynp eliminated, 2nd+3rd argument removed from exchange horiz,
53	! moisture renamed humidity
54	!
55	! RCS Log replace by Id keyword, revision history cleaned up
56	!
57	! Revision 1.8 2006/08/22 14:16:05 raasch
58	! Disturbances are imposed only for the last Runge-Kutta-substep
59	!
60	! Revision 1.2 2004/04/30 13:03:40 raasch
61	! decalpha-specific warning removed, routine name changed to time_integration,
62	! particle advection is carried out only once during the intermediate steps,
63	! impulse_advec renamed momentum_advec
64	!
65	! Revision 1.1 1997/08/11 06:19:04 raasch
66	! Initial revision
67	!
68	!
69	! Description:
70	! ------------
71	! Integration in time of the model equations, statistical analysis and graphic
72	! output
73	!------------------------------------------------------------------------------!
74
75	USE arrays_3d
76	USE averaging
77	USE control_parameters
78	USE cpulog
79	#if defined( __dvrp_graphics )
80	USE DVRP
81	#endif
82	USE grid_variables
83	USE indices
84	USE interaction_droplets_ptq_mod
85	USE interfaces
86	USE particle_attributes
87	USE pegrid
88	USE prognostic_equations_mod
89	USE statistics
90	USE user_actions_mod
91
92	IMPLICIT NONE
93
94	CHARACTER (LEN=9) :: time_to_string
95	INTEGER :: i, j, k
96
97	!
98	!-- At the beginning of a simulation determine the time step as well as
99	!-- determine and print out the run control parameters
100	IF ( simulated_time == 0.0 ) CALL timestep
101
102	CALL run_control
103
104
105	!
106	!-- Data exchange between coupled models in case that a call has been omitted
107	!-- at the end of the previous run of a job chain.
108	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
109	!
110	!-- In case of model termination initiated by the local model the coupler
111	!-- must not be called because this would again cause an MPI hang.
112	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
113	CALL surface_coupler
114	time_coupling = time_coupling - dt_coupling
115	ENDDO
116	IF (time_coupling == 0.0 .AND. time_since_reference_point < dt_coupling)&
117	THEN
118	time_coupling = time_since_reference_point
119	ENDIF
120	ENDIF
121
122
123	#if defined( __dvrp_graphics )
124	!
125	!-- Time measurement with dvrp software
126	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
127	#endif
128
129	!
130	!-- Start of the time loop
131	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
132	.NOT. terminate_run )
133
134	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
135	!
136	!-- Determine size of next time step
137	IF ( simulated_time /= 0.0 ) CALL timestep
138	!
139	!-- Execute the user-defined actions
140	CALL user_actions( 'before_timestep' )
141
142	!
143	!-- Start of intermediate step loop
144	intermediate_timestep_count = 0
145	DO WHILE ( intermediate_timestep_count < &
146	intermediate_timestep_count_max )
147
148	intermediate_timestep_count = intermediate_timestep_count + 1
149
150	!
151	!-- Set the steering factors for the prognostic equations which depend
152	!-- on the timestep scheme
153	CALL timestep_scheme_steering
154
155	!
156	!-- Solve the prognostic equations. A fast cache optimized version with
157	!-- only one single loop is used in case of Piascek-Williams advection
158	!-- scheme. NEC vector machines use a different version, because
159	!-- in the other versions a good vectorization is prohibited due to
160	!-- inlining problems.
161	IF ( loop_optimization == 'vector' ) THEN
162	CALL prognostic_equations_vector
163	ELSE
164	IF ( momentum_advec == 'ups-scheme' .OR. &
165	scalar_advec == 'ups-scheme' .OR. &
166	scalar_advec == 'bc-scheme' ) &
167	THEN
168	CALL prognostic_equations_noopt
169	ELSE
170	CALL prognostic_equations_cache
171	ENDIF
172	ENDIF
173
174	!
175	!-- Particle advection (only once during intermediate steps, because
176	!-- it uses an Euler-step)
177	IF ( particle_advection .AND. &
178	simulated_time >= particle_advection_start .AND. &
179	intermediate_timestep_count == 1 ) THEN
180	CALL advec_particles
181	first_call_advec_particles = .FALSE.
182	ENDIF
183
184	!
185	!-- Interaction of droplets with temperature and specific humidity.
186	!-- Droplet condensation and evaporation is calculated within
187	!-- advec_particles.
188	IF ( cloud_droplets .AND. &
189	intermediate_timestep_count == intermediate_timestep_count_max )&
190	THEN
191	CALL interaction_droplets_ptq
192	ENDIF
193
194	!
195	!-- Exchange of ghost points (lateral boundary conditions)
196	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
197	CALL exchange_horiz( u_p, nbgp )
198	CALL exchange_horiz( v_p, nbgp )
199	CALL exchange_horiz( w_p, nbgp )
200	CALL exchange_horiz( pt_p, nbgp )
201	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, nbgp )
202	IF ( ocean ) THEN
203	CALL exchange_horiz( sa_p, nbgp )
204	CALL exchange_horiz( rho, nbgp )
205	CALL exchange_horiz( prho, nbgp )
206	ENDIF
207	IF (humidity .OR. passive_scalar) CALL exchange_horiz( q_p, nbgp )
208	IF ( cloud_droplets ) THEN
209	CALL exchange_horiz( ql, nbgp )
210	CALL exchange_horiz( ql_c, nbgp )
211	CALL exchange_horiz( ql_v, nbgp )
212	CALL exchange_horiz( ql_vp, nbgp )
213	ENDIF
214
215	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
216
217	!
218	!-- Apply time filter in case of leap-frog timestep
219	IF ( tsc(2) == 2.0 .AND. timestep_scheme(1:8) == 'leapfrog' ) THEN
220	CALL asselin_filter
221	ENDIF
222
223	!
224	!-- Boundary conditions for the prognostic quantities (except of the
225	!-- velocities at the outflow in case of a non-cyclic lateral wall)
226	CALL boundary_conds( 'main' )
227
228	!
229	!-- Swap the time levels in preparation for the next time step.
230	CALL swap_timelevel
231
232	!
233	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
234	!-- when a sloping surface is used
235	IF ( sloping_surface ) THEN
236	IF ( nxl == 0 ) pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - pt_slope_offset
237	IF ( nxr == nx ) pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + pt_slope_offset
238	ENDIF
239
240	!
241	!-- Impose a turbulent inflow using the recycling method
242	IF ( turbulent_inflow ) CALL inflow_turbulence
243
244	!
245	!-- Impose a random perturbation on the horizontal velocity field
246	IF ( create_disturbances .AND. &
247	( call_psolver_at_all_substeps .AND. &
248	intermediate_timestep_count == intermediate_timestep_count_max )&
249	.OR. ( .NOT. call_psolver_at_all_substeps .AND. &
250	intermediate_timestep_count == 1 ) ) &
251	THEN
252	time_disturb = time_disturb + dt_3d
253	IF ( time_disturb >= dt_disturb ) THEN
254	IF ( hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit ) THEN
255	CALL disturb_field( nzb_u_inner, tend, u )
256	CALL disturb_field( nzb_v_inner, tend, v )
257	ELSEIF ( bc_lr /= 'cyclic' .OR. bc_ns /= 'cyclic' ) THEN
258	!
259	!-- Runs with a non-cyclic lateral wall need perturbations
260	!-- near the inflow throughout the whole simulation
261	dist_range = 1
262	CALL disturb_field( nzb_u_inner, tend, u )
263	CALL disturb_field( nzb_v_inner, tend, v )
264	dist_range = 0
265	ENDIF
266	time_disturb = time_disturb - dt_disturb
267	ENDIF
268	ENDIF
269
270	!
271	!-- Reduce the velocity divergence via the equation for perturbation
272	!-- pressure.
273	IF ( intermediate_timestep_count == 1 .OR. &
274	call_psolver_at_all_substeps ) THEN
275	CALL pres
276	ENDIF
277
278	!
279	!-- If required, compute virtuell potential temperature
280	IF ( humidity ) CALL compute_vpt
281
282	!
283	!-- If required, compute liquid water content
284	IF ( cloud_physics ) CALL calc_liquid_water_content
285
286	!
287	!-- Compute the diffusion quantities
288	IF ( .NOT. constant_diffusion ) THEN
289
290	!
291	!-- First the vertical fluxes in the Prandtl layer are being computed
292	IF ( prandtl_layer ) THEN
293	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
294	CALL prandtl_fluxes
295	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
296	ENDIF
297
298	!
299	!-- Compute the diffusion coefficients
300	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
301	IF ( .NOT. humidity ) THEN
302	IF ( ocean ) THEN
303	CALL diffusivities( prho, prho_reference )
304	ELSE
305	CALL diffusivities( pt, pt_reference )
306	ENDIF
307	ELSE
308	CALL diffusivities( vpt, pt_reference )
309	ENDIF
310	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
311
312	ENDIF
313
314	ENDDO ! Intermediate step loop
315
316	!
317	!-- Increase simulation time and output times
318	current_timestep_number = current_timestep_number + 1
319	simulated_time = simulated_time + dt_3d
320	simulated_time_chr = time_to_string( simulated_time )
321	time_since_reference_point = simulated_time - coupling_start_time
322
323	IF ( simulated_time >= skip_time_data_output_av ) THEN
324	time_do_av = time_do_av + dt_3d
325	ENDIF
326	IF ( simulated_time >= skip_time_do2d_xy ) THEN
327	time_do2d_xy = time_do2d_xy + dt_3d
328	ENDIF
329	IF ( simulated_time >= skip_time_do2d_xz ) THEN
330	time_do2d_xz = time_do2d_xz + dt_3d
331	ENDIF
332	IF ( simulated_time >= skip_time_do2d_yz ) THEN
333	time_do2d_yz = time_do2d_yz + dt_3d
334	ENDIF
335	IF ( simulated_time >= skip_time_do3d ) THEN
336	time_do3d = time_do3d + dt_3d
337	ENDIF
338	DO mid = 1, masks
339	IF ( simulated_time >= skip_time_domask(mid) ) THEN
340	time_domask(mid)= time_domask(mid) + dt_3d
341	ENDIF
342	ENDDO
343	time_dvrp = time_dvrp + dt_3d
344	IF ( simulated_time >= skip_time_dosp ) THEN
345	time_dosp = time_dosp + dt_3d
346	ENDIF
347	time_dots = time_dots + dt_3d
348	IF ( .NOT. first_call_advec_particles ) THEN
349	time_dopts = time_dopts + dt_3d
350	ENDIF
351	IF ( simulated_time >= skip_time_dopr ) THEN
352	time_dopr = time_dopr + dt_3d
353	ENDIF
354	time_dopr_listing = time_dopr_listing + dt_3d
355	time_run_control = time_run_control + dt_3d
356
357	!
358	!-- Data exchange between coupled models
359	IF ( coupling_mode /= 'uncoupled' .AND. run_coupled ) THEN
360	time_coupling = time_coupling + dt_3d
361
362	!
363	!-- In case of model termination initiated by the local model
364	!-- (terminate_coupled > 0), the coupler must be skipped because it would
365	!-- cause an MPI intercomminucation hang.
366	!-- If necessary, the coupler will be called at the beginning of the
367	!-- next restart run.
368	DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
369	CALL surface_coupler
370	time_coupling = time_coupling - dt_coupling
371	ENDDO
372	ENDIF
373
374	!
375	!-- Execute user-defined actions
376	CALL user_actions( 'after_integration' )
377
378	!
379	!-- If Galilei transformation is used, determine the distance that the
380	!-- model has moved so far
381	IF ( galilei_transformation ) THEN
382	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
383	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
384	ENDIF
385
386	!
387	!-- Check, if restart is necessary (because cpu-time is expiring or
388	!-- because it is forced by user) and set stop flag
389	!-- This call is skipped if the remote model has already initiated a restart.
390	IF ( .NOT. terminate_run ) CALL check_for_restart
391
392	!
393	!-- Carry out statistical analysis and output at the requested output times.
394	!-- The MOD function is used for calculating the output time counters (like
395	!-- time_dopr) in order to regard a possible decrease of the output time
396	!-- interval in case of restart runs
397
398	!
399	!-- Set a flag indicating that so far no statistics have been created
400	!-- for this time step
401	flow_statistics_called = .FALSE.
402
403	!
404	!-- If required, call flow_statistics for averaging in time
405	IF ( averaging_interval_pr /= 0.0 .AND. &
406	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
407	simulated_time >= skip_time_dopr ) THEN
408	time_dopr_av = time_dopr_av + dt_3d
409	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
410	do_sum = .TRUE.
411	time_dopr_av = MOD( time_dopr_av, &
412	MAX( dt_averaging_input_pr, dt_3d ) )
413	ENDIF
414	ENDIF
415	IF ( do_sum ) CALL flow_statistics
416
417	!
418	!-- Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
419	IF ( averaging_interval /= 0.0 .AND. &
420	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
421	simulated_time >= skip_time_data_output_av ) &
422	THEN
423	time_do_sla = time_do_sla + dt_3d
424	IF ( time_do_sla >= dt_averaging_input ) THEN
425	CALL sum_up_3d_data
426	average_count_3d = average_count_3d + 1
427	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
428	ENDIF
429	ENDIF
430
431	!
432	!-- Calculate spectra for time averaging
433	IF ( averaging_interval_sp /= 0.0 .AND. &
434	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
435	simulated_time >= skip_time_dosp ) THEN
436	time_dosp_av = time_dosp_av + dt_3d
437	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
438	CALL calc_spectra
439	time_dosp_av = MOD( time_dosp_av, &
440	MAX( dt_averaging_input_pr, dt_3d ) )
441	ENDIF
442	ENDIF
443
444	!
445	!-- Computation and output of run control parameters.
446	!-- This is also done whenever the time step has changed or perturbations
447	!-- have been imposed
448	IF ( time_run_control >= dt_run_control .OR. &
449	( dt_changed .AND. timestep_scheme(1:5) /= 'runge' ) .OR. &
450	disturbance_created ) &
451	THEN
452	CALL run_control
453	IF ( time_run_control >= dt_run_control ) THEN
454	time_run_control = MOD( time_run_control, &
455	MAX( dt_run_control, dt_3d ) )
456	ENDIF
457	ENDIF
458
459	!
460	!-- Profile output (ASCII) on file
461	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
462	CALL print_1d
463	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
464	dt_3d ) )
465	ENDIF
466
467	!
468	!-- Graphic output for PROFIL
469	IF ( time_dopr >= dt_dopr ) THEN
470	IF ( dopr_n /= 0 ) CALL data_output_profiles
471	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
472	time_dopr_av = 0.0 ! due to averaging (see above)
473	ENDIF
474
475	!
476	!-- Graphic output for time series
477	IF ( time_dots >= dt_dots ) THEN
478	CALL data_output_tseries
479	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
480	ENDIF
481
482	!
483	!-- Output of spectra (formatted for use with PROFIL), in case of no
484	!-- time averaging, spectra has to be calculated before
485	IF ( time_dosp >= dt_dosp ) THEN
486	IF ( average_count_sp == 0 ) CALL calc_spectra
487	CALL data_output_spectra
488	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
489	ENDIF
490
491	!
492	!-- 2d-data output (cross-sections)
493	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
494	CALL data_output_2d( 'xy', 0 )
495	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
496	ENDIF
497	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
498	CALL data_output_2d( 'xz', 0 )
499	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
500	ENDIF
501	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
502	CALL data_output_2d( 'yz', 0 )
503	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
504	ENDIF
505
506	!
507	!-- 3d-data output (volume data)
508	IF ( time_do3d >= dt_do3d ) THEN
509	CALL data_output_3d( 0 )
510	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
511	ENDIF
512
513	!
514	!-- masked data output
515	DO mid = 1, masks
516	IF ( time_domask(mid) >= dt_domask(mid) ) THEN
517	CALL data_output_mask( 0 )
518	time_domask(mid) = MOD( time_domask(mid), &
519	MAX( dt_domask(mid), dt_3d ) )
520	ENDIF
521	ENDDO
522
523	!
524	!-- Output of time-averaged 2d/3d/masked data
525	IF ( time_do_av >= dt_data_output_av ) THEN
526	CALL average_3d_data
527	CALL data_output_2d( 'xy', 1 )
528	CALL data_output_2d( 'xz', 1 )
529	CALL data_output_2d( 'yz', 1 )
530	CALL data_output_3d( 1 )
531	DO mid = 1, masks
532	CALL data_output_mask( 1 )
533	ENDDO
534	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
535	ENDIF
536
537	!
538	!-- Output of particle time series
539	IF ( particle_advection ) THEN
540	IF ( time_dopts >= dt_dopts .OR. &
541	( simulated_time >= particle_advection_start .AND. &
542	first_call_advec_particles ) ) THEN
543	CALL data_output_ptseries
544	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
545	ENDIF
546	ENDIF
547
548	!
549	!-- Output of dvrp-graphics (isosurface, particles, slicer)
550	#if defined( __dvrp_graphics )
551	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
552	#endif
553	IF ( time_dvrp >= dt_dvrp ) THEN
554	CALL data_output_dvrp
555	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
556	ENDIF
557	#if defined( __dvrp_graphics )
558	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
559	#endif
560
561	!
562	!-- If required, set the heat flux for the next time step at a random value
563	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
564
565	!
566	!-- Execute user-defined actions
567	CALL user_actions( 'after_timestep' )
568
569	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
570
571
572	ENDDO ! time loop
573
574	#if defined( __dvrp_graphics )
575	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
576	#endif
577
578	END SUBROUTINE time_integration

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