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source: palm/trunk/SOURCE/time_integration.f90 @ 30

Last change on this file since 30 was 4, checked in by raasch, 18 years ago
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1	SUBROUTINE time_integration
2
3	!------------------------------------------------------------------------------!
4	! Actual revisions:
5	! -----------------
6	!
7	!
8	! Former revisions:
9	! -----------------
10	! $Id: time_integration.f90 4 2007-02-13 11:33:16Z raasch $
11	! RCS Log replace by Id keyword, revision history cleaned up
12	!
13	! Revision 1.8 2006/08/22 14:16:05 raasch
14	! Disturbances are imposed only for the last Runge-Kutta-substep
15	!
16	! Revision 1.2 2004/04/30 13:03:40 raasch
17	! decalpha-specific warning removed, routine name changed to time_integration,
18	! particle advection is carried out only once during the intermediate steps,
19	! impulse_advec renamed momentum_advec
20	!
21	! Revision 1.1 1997/08/11 06:19:04 raasch
22	! Initial revision
23	!
24	!
25	! Description:
26	! ------------
27	! Integration in time of the model equations, statistical analysis and graphic
28	! output
29	!------------------------------------------------------------------------------!
30
31	USE arrays_3d
32	USE averaging
33	USE control_parameters
34	USE cpulog
35	#if defined( __dvrp_graphics )
36	USE DVRP
37	#endif
38	USE grid_variables
39	USE indices
40	USE interaction_droplets_ptq_mod
41	USE interfaces
42	USE particle_attributes
43	USE pegrid
44	USE prognostic_equations_mod
45	USE statistics
46	USE user_actions_mod
47
48	IMPLICIT NONE
49
50	CHARACTER (LEN=9) :: time_to_string
51	INTEGER :: i, j, k
52
53	!
54	!-- At the beginning of a simulation determine the time step as well as
55	!-- determine and print out the run control parameters
56	IF ( simulated_time == 0.0 ) CALL timestep
57	CALL run_control
58
59	#if defined( __dvrp_graphics )
60	!
61	!-- Time measurement with dvrp software
62	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
63	#endif
64
65	!
66	!-- Start of the time loop
67	DO WHILE ( simulated_time < end_time .AND. .NOT. stop_dt .AND. &
68	.NOT. terminate_run )
69
70	CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
71
72	!
73	!-- Determine size of next time step
74	IF ( simulated_time /= 0.0 ) CALL timestep
75
76	!
77	!-- Execute the user-defined actions
78	CALL user_actions( 'before_timestep' )
79
80	!
81	!-- Start of intermediate step loop
82	intermediate_timestep_count = 0
83	DO WHILE ( intermediate_timestep_count < &
84	intermediate_timestep_count_max )
85
86	intermediate_timestep_count = intermediate_timestep_count + 1
87
88	!
89	!-- Set the steering factors for the prognostic equations which depend
90	!-- on the timestep scheme
91	CALL timestep_scheme_steering
92
93	!
94	!-- Solve the prognostic equations. A fast cache optimized version with
95	!-- only one single loop is used in case of Piascek-Williams advection
96	!-- scheme. NEC vector machines use a different version, because
97	!-- in the other versions a good vectorization is prohibited due to
98	!-- inlining problems.
99	IF ( host(1:3) == 'nec' ) THEN
100	CALL prognostic_equations_vec
101	ELSE
102	IF ( momentum_advec == 'ups-scheme' .OR. &
103	scalar_advec == 'ups-scheme' .OR. &
104	scalar_advec == 'bc-scheme' ) &
105	THEN
106	CALL prognostic_equations
107	ELSE
108	CALL prognostic_equations_fast
109	ENDIF
110	ENDIF
111
112	!
113	!-- Particle advection (only once during intermediate steps, because
114	!-- it uses an Euler-step)
115	IF ( simulated_time >= particle_advection_start .AND. &
116	intermediate_timestep_count == 1 ) THEN
117	CALL advec_particles
118	first_call_advec_particles = .FALSE.
119	ENDIF
120
121	!
122	!-- Interaction of droplets with temperature and specific humidity.
123	!-- Droplet condensation and evaporation is calculated within
124	!-- advec_particles.
125	IF ( cloud_droplets .AND. &
126	intermediate_timestep_count == intermediate_timestep_count_max )&
127	THEN
128	CALL interaction_droplets_ptq
129	ENDIF
130
131	!
132	!-- Exchange of ghost points (lateral boundary conditions)
133	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
134	CALL exchange_horiz( u_p, uxrp, 0 )
135	CALL exchange_horiz( v_p, 0, vynp )
136	CALL exchange_horiz( w_p, 0, 0 )
137	CALL exchange_horiz( pt_p, 0, 0 )
138	IF ( .NOT. constant_diffusion ) CALL exchange_horiz( e_p, 0, 0)
139	IF ( moisture .OR. passive_scalar ) CALL exchange_horiz( q_p, 0, 0)
140	IF ( cloud_droplets ) THEN
141	CALL exchange_horiz( ql, 0, 0 )
142	CALL exchange_horiz( ql_c, 0, 0 )
143	CALL exchange_horiz( ql_v, 0, 0 )
144	CALL exchange_horiz( ql_vp, 0, 0 )
145	ENDIF
146
147	CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
148
149	!
150	!-- Apply time filter in case of leap-frog timestep
151	IF ( tsc(2) == 2.0 .AND. timestep_scheme(1:8) == 'leapfrog' ) THEN
152	CALL asselin_filter
153	ENDIF
154
155	!
156	!-- Swap the time levels in preparation for the next time step.
157	CALL swap_timelevel
158
159	!
160	!-- Boundary conditions for the prognostic quantities (except of the
161	!-- velocities at the outflow in case of a non-cyclic lateral wall)
162	CALL boundary_conds( 'main' )
163
164	!
165	!-- Temperature offset must be imposed at cyclic boundaries in x-direction
166	!-- when a sloping surface is used
167	IF ( sloping_surface ) THEN
168	IF ( nxl == 0 ) pt(:,:,nxl-1) = pt(:,:,nxl-1) - pt_slope_offset
169	IF ( nxr == nx ) pt(:,:,nxr+1) = pt(:,:,nxr+1) + pt_slope_offset
170	ENDIF
171
172	!
173	!-- Impose a random perturbation on the horizontal velocity field
174	IF ( create_disturbances .AND. &
175	intermediate_timestep_count == intermediate_timestep_count_max )&
176	THEN
177	time_disturb = time_disturb + dt_3d
178	IF ( time_disturb >= dt_disturb ) THEN
179	IF ( hom(nzb+5,1,var_hom,0) < disturbance_energy_limit ) THEN
180	CALL disturb_field( nzb_u_inner, tend, u, uxrp, 0 )
181	CALL disturb_field( nzb_v_inner, tend, v , 0, vynp )
182	ELSEIF ( bc_lr /= 'cyclic' .OR. bc_ns /= 'cyclic' ) THEN
183	!
184	!-- Runs with a non-cyclic lateral wall need perturbations
185	!-- near the inflow throughout the whole simulation
186	dist_range = 1
187	CALL disturb_field( nzb_u_inner, tend, u, uxrp, 0 )
188	CALL disturb_field( nzb_v_inner, tend, v , 0, vynp )
189	dist_range = 0
190	ENDIF
191	time_disturb = time_disturb - dt_disturb
192	ENDIF
193	ENDIF
194
195	!
196	!-- Reduce the velocity divergence via the equation for perturbation
197	!-- pressure.
198	IF ( intermediate_timestep_count == intermediate_timestep_count_max &
199	.OR. call_psolver_at_all_substeps ) THEN
200	CALL pres
201	ENDIF
202
203	!
204	!-- In case of a non-cyclic lateral wall, set the boundary conditions for
205	!-- the velocities at the outflow
206	IF ( bc_lr /= 'cyclic' .OR. bc_ns /= 'cyclic' ) THEN
207	CALL boundary_conds( 'outflow_uvw' )
208	ENDIF
209
210	!
211	!-- If required, compute virtuell potential temperature
212	IF ( moisture ) CALL compute_vpt
213
214	!
215	!-- If required, compute liquid water content
216	IF ( cloud_physics ) CALL calc_liquid_water_content
217
218	!
219	!-- Compute the diffusion quantities
220	IF ( .NOT. constant_diffusion ) THEN
221
222	!
223	!-- First the vertical fluxes in the Prandtl layer are being computed
224	IF ( prandtl_layer ) THEN
225	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'start' )
226	CALL prandtl_fluxes
227	CALL cpu_log( log_point(19), 'prandtl_fluxes', 'stop' )
228	ENDIF
229
230	!
231	!-- Compute the diffusion coefficients
232	CALL cpu_log( log_point(17), 'diffusivities', 'start' )
233	IF ( .NOT. moisture ) THEN
234	CALL diffusivities( pt )
235	ELSE
236	CALL diffusivities( vpt )
237	ENDIF
238	CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
239
240	ENDIF
241
242	ENDDO ! Intermediate step loop
243
244	!
245	!-- Execute user-defined actions
246	CALL user_actions( 'after_integration' )
247
248	!
249	!-- Increase simulation time and output times
250	current_timestep_number = current_timestep_number + 1
251	simulated_time = simulated_time + dt_3d
252	simulated_time_chr = time_to_string( simulated_time )
253	IF ( simulated_time >= skip_time_data_output_av ) THEN
254	time_do_av = time_do_av + dt_3d
255	ENDIF
256	IF ( simulated_time >= skip_time_do2d_xy ) THEN
257	time_do2d_xy = time_do2d_xy + dt_3d
258	ENDIF
259	IF ( simulated_time >= skip_time_do2d_xz ) THEN
260	time_do2d_xz = time_do2d_xz + dt_3d
261	ENDIF
262	IF ( simulated_time >= skip_time_do2d_yz ) THEN
263	time_do2d_yz = time_do2d_yz + dt_3d
264	ENDIF
265	IF ( simulated_time >= skip_time_do3d ) THEN
266	time_do3d = time_do3d + dt_3d
267	ENDIF
268	time_dvrp = time_dvrp + dt_3d
269	IF ( simulated_time >= skip_time_dosp ) THEN
270	time_dosp = time_dosp + dt_3d
271	ENDIF
272	time_dots = time_dots + dt_3d
273	IF ( .NOT. first_call_advec_particles ) THEN
274	time_dopts = time_dopts + dt_3d
275	ENDIF
276	IF ( simulated_time >= skip_time_dopr ) THEN
277	time_dopr = time_dopr + dt_3d
278	ENDIF
279	time_dopr_listing = time_dopr_listing + dt_3d
280	time_run_control = time_run_control + dt_3d
281
282	!
283	!-- If Galilei transformation is used, determine the distance that the
284	!-- model has moved so far
285	IF ( galilei_transformation ) THEN
286	advected_distance_x = advected_distance_x + u_gtrans * dt_3d
287	advected_distance_y = advected_distance_y + v_gtrans * dt_3d
288	ENDIF
289
290	!
291	!-- Check, if restart is necessary (because cpu-time is expiring or
292	!-- because it is forced by user) and set stop flag
293	CALL check_for_restart
294
295	!
296	!-- Carry out statistical analysis and output at the requested output times.
297	!-- The MOD function is used for calculating the output time counters (like
298	!-- time_dopr) in order to regard a possible decrease of the output time
299	!-- interval in case of restart runs
300
301	!
302	!-- Set a flag indicating that so far no statistics have been created
303	!-- for this time step
304	flow_statistics_called = .FALSE.
305
306	!
307	!-- If required, call flow_statistics for averaging in time
308	IF ( averaging_interval_pr /= 0.0 .AND. &
309	( dt_dopr - time_dopr ) <= averaging_interval_pr .AND. &
310	simulated_time >= skip_time_dopr ) THEN
311	time_dopr_av = time_dopr_av + dt_3d
312	IF ( time_dopr_av >= dt_averaging_input_pr ) THEN
313	do_sum = .TRUE.
314	time_dopr_av = MOD( time_dopr_av, &
315	MAX( dt_averaging_input_pr, dt_3d ) )
316	ENDIF
317	ENDIF
318	IF ( do_sum ) CALL flow_statistics
319
320	!
321	!-- Sum-up 3d-arrays for later output of time-averaged data
322	IF ( averaging_interval /= 0.0 .AND. &
323	( dt_data_output_av - time_do_av ) <= averaging_interval .AND. &
324	simulated_time >= skip_time_data_output_av ) &
325	THEN
326	time_do_sla = time_do_sla + dt_3d
327	IF ( time_do_sla >= dt_averaging_input ) THEN
328	CALL sum_up_3d_data
329	average_count_3d = average_count_3d + 1
330	time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
331	ENDIF
332	ENDIF
333
334	!
335	!-- Calculate spectra for time averaging
336	IF ( averaging_interval_sp /= 0.0 .AND. &
337	( dt_dosp - time_dosp ) <= averaging_interval_sp .AND. &
338	simulated_time >= skip_time_dosp ) THEN
339	time_dosp_av = time_dosp_av + dt_3d
340	IF ( time_dosp_av >= dt_averaging_input_pr ) THEN
341	CALL calc_spectra
342	time_dosp_av = MOD( time_dosp_av, &
343	MAX( dt_averaging_input_pr, dt_3d ) )
344	ENDIF
345	ENDIF
346
347	!
348	!-- Computation and output of run control parameters.
349	!-- This is also done whenever the time step has changed or perturbations
350	!-- have been imposed
351	IF ( time_run_control >= dt_run_control .OR. &
352	( dt_changed .AND. timestep_scheme(1:5) /= 'runge' ) .OR. &
353	disturbance_created ) &
354	THEN
355	CALL run_control
356	IF ( time_run_control >= dt_run_control ) THEN
357	time_run_control = MOD( time_run_control, &
358	MAX( dt_run_control, dt_3d ) )
359	ENDIF
360	ENDIF
361
362	!
363	!-- Profile output (ASCII) on file
364	IF ( time_dopr_listing >= dt_dopr_listing ) THEN
365	CALL print_1d
366	time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
367	dt_3d ) )
368	ENDIF
369
370	!
371	!-- Graphic output for PROFIL
372	IF ( time_dopr >= dt_dopr ) THEN
373	IF ( dopr_n /= 0 ) CALL data_output_profiles
374	time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
375	time_dopr_av = 0.0 ! due to averaging (see above)
376	ENDIF
377
378	!
379	!-- Graphic output for time series
380	IF ( time_dots >= dt_dots ) THEN
381	IF ( dots_n /= 0 ) CALL data_output_tseries
382	time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
383	ENDIF
384
385	!
386	!-- Output of spectra (formatted for use with PROFIL), in case of no
387	!-- time averaging, spectra has to be calculated before
388	IF ( time_dosp >= dt_dosp ) THEN
389	IF ( average_count_sp == 0 ) CALL calc_spectra
390	CALL data_output_spectra
391	time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
392	ENDIF
393
394	!
395	!-- 2d-data output (cross-sections)
396	IF ( time_do2d_xy >= dt_do2d_xy ) THEN
397	CALL data_output_2d( 'xy', 0 )
398	time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
399	ENDIF
400	IF ( time_do2d_xz >= dt_do2d_xz ) THEN
401	CALL data_output_2d( 'xz', 0 )
402	time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
403	ENDIF
404	IF ( time_do2d_yz >= dt_do2d_yz ) THEN
405	CALL data_output_2d( 'yz', 0 )
406	time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
407	ENDIF
408
409	!
410	!-- 3d-data output (volume data)
411	IF ( time_do3d >= dt_do3d ) THEN
412	CALL data_output_3d( 0 )
413	time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
414	ENDIF
415
416	!
417	!-- Output of time-averaged 2d/3d-data
418	IF ( time_do_av >= dt_data_output_av ) THEN
419	CALL average_3d_data
420	CALL data_output_2d( 'xy', 1 )
421	CALL data_output_2d( 'xz', 1 )
422	CALL data_output_2d( 'yz', 1 )
423	CALL data_output_3d( 1 )
424	time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
425	ENDIF
426
427	!
428	!-- Output of particle time series
429	IF ( time_dopts >= dt_dopts .OR. &
430	( simulated_time >= particle_advection_start .AND. &
431	first_call_advec_particles ) ) THEN
432	CALL data_output_ptseries
433	time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
434	ENDIF
435
436	!
437	!-- Output of dvrp-graphics (isosurface, particles, slicer)
438	#if defined( __dvrp_graphics )
439	CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
440	#endif
441	IF ( time_dvrp >= dt_dvrp ) THEN
442	CALL data_output_dvrp
443	time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
444	ENDIF
445	#if defined( __dvrp_graphics )
446	CALL DVRP_LOG_EVENT( 2, current_timestep_number )
447	#endif
448
449	!
450	!-- If required, set the heat flux for the next time step at a random value
451	IF ( constant_heatflux .AND. random_heatflux ) CALL disturb_heatflux
452
453	!
454	!-- Execute user-defined actions
455	CALL user_actions( 'after_timestep' )
456
457	CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
458
459	ENDDO ! time loop
460
461	#if defined( __dvrp_graphics )
462	CALL DVRP_LOG_EVENT( -2, current_timestep_number )
463	#endif
464
465	END SUBROUTINE time_integration

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