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source: palm/trunk/SOURCE/init_pegrid.f90 @ 755

Last change on this file since 755 was 755, checked in by witha, 13 years ago
adapted for lcflow (ForWind? cluster in Oldenburg)
Property svn:keywords set to `Id`
File size: 40.7 KB

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1	SUBROUTINE init_pegrid
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	! 2d-decomposition is default for lcflow (ForWind cluster in Oldenburg)
8	!
9	! ATTENTION: nnz_x undefined problem still has to be solved!!!!!!!!
10	! TEST OUTPUT (TO BE REMOVED) logging mpi2 ierr values
11	!
12	! Former revisions:
13	! -----------------
14	! $Id: init_pegrid.f90 755 2011-08-29 09:55:16Z witha $
15	!
16	! 722 2011-04-11 06:21:09Z raasch
17	! Bugfix: bc_lr/ns_cyc/dirrad/raddir replaced by bc_lr/ns, because variables
18	! are not yet set here; grid_level set to 0
19	!
20	! 709 2011-03-30 09:31:40Z raasch
21	! formatting adjustments
22	!
23	! 707 2011-03-29 11:39:40Z raasch
24	! bc_lr/ns replaced by bc_lr/ns_cyc/dirrad/raddir
25	!
26	! 667 2010-12-23 12:06:00Z suehring/gryschka
27	! Moved determination of target_id's from init_coupling
28	! Determination of parameters needed for coupling (coupling_topology, ngp_a,
29	! ngp_o) with different grid/processor-topology in ocean and atmosphere
30	! Adaption of ngp_xy, ngp_y to a dynamic number of ghost points.
31	! The maximum_grid_level changed from 1 to 0. 0 is the normal grid, 1 to
32	! maximum_grid_level the grids for multigrid, in which 0 and 1 are normal grids.
33	! This distinction is due to reasons of data exchange and performance for the
34	! normal grid and grids in poismg.
35	! The definition of MPI-Vectors adapted to a dynamic numer of ghost points.
36	! New MPI-Vectors for data exchange between left and right boundaries added.
37	! This is due to reasons of performance (10% faster).
38	!
39	! 646 2010-12-15 13:03:52Z raasch
40	! lctit is now using a 2d decomposition by default
41	!
42	! 622 2010-12-10 08:08:13Z raasch
43	! optional barriers included in order to speed up collective operations
44	!
45	! 438 2010-02-01 04:32:43Z raasch
46	! 2d-decomposition is default for Cray-XT machines
47	!
48	! 274 2009-03-26 15:11:21Z heinze
49	! Output of messages replaced by message handling routine.
50	!
51	! 206 2008-10-13 14:59:11Z raasch
52	! Implementation of a MPI-1 coupling: added __parallel within the __mpi2 part
53	! 2d-decomposition is default on SGI-ICE systems
54	!
55	! 197 2008-09-16 15:29:03Z raasch
56	! multigrid levels are limited by subdomains if mg_switch_to_pe0_level = -1,
57	! nz is used instead nnz for calculating mg-levels
58	! Collect on PE0 horizontal index bounds from all other PEs,
59	! broadcast the id of the inflow PE (using the respective communicator)
60	!
61	! 114 2007-10-10 00:03:15Z raasch
62	! Allocation of wall flag arrays for multigrid solver
63	!
64	! 108 2007-08-24 15:10:38Z letzel
65	! Intercommunicator (comm_inter) and derived data type (type_xy) for
66	! coupled model runs created, assign coupling_mode_remote,
67	! indices nxlu and nysv are calculated (needed for non-cyclic boundary
68	! conditions)
69	!
70	! 82 2007-04-16 15:40:52Z raasch
71	! Cpp-directive lcmuk changed to intel_openmp_bug, setting of host on lcmuk by
72	! cpp-directive removed
73	!
74	! 75 2007-03-22 09:54:05Z raasch
75	! uxrp, vynp eliminated,
76	! dirichlet/neumann changed to dirichlet/radiation, etc.,
77	! poisfft_init is only called if fft-solver is switched on
78	!
79	! RCS Log replace by Id keyword, revision history cleaned up
80	!
81	! Revision 1.28 2006/04/26 13:23:32 raasch
82	! lcmuk does not understand the !$ comment so a cpp-directive is required
83	!
84	! Revision 1.1 1997/07/24 11:15:09 raasch
85	! Initial revision
86	!
87	!
88	! Description:
89	! ------------
90	! Determination of the virtual processor topology (if not prescribed by the
91	! user)and computation of the grid point number and array bounds of the local
92	! domains.
93	!------------------------------------------------------------------------------!
94
95	USE control_parameters
96	USE fft_xy
97	USE grid_variables
98	USE indices
99	USE pegrid
100	USE poisfft_mod
101	USE poisfft_hybrid_mod
102	USE statistics
103	USE transpose_indices
104
105
106
107	IMPLICIT NONE
108
109	INTEGER :: gathered_size, i, id_inflow_l, id_recycling_l, ind(5), j, k, &
110	maximum_grid_level_l, mg_switch_to_pe0_level_l, mg_levels_x, &
111	mg_levels_y, mg_levels_z, nnx_y, nnx_z, nny_x, nny_z, nnz_x, &
112	nnz_y, numproc_sqr, nx_total, nxl_l, nxr_l, nyn_l, nys_l, &
113	nzb_l, nzt_l, omp_get_num_threads, subdomain_size
114
115	INTEGER, DIMENSION(:), ALLOCATABLE :: ind_all, nxlf, nxrf, nynf, nysf
116
117	INTEGER, DIMENSION(2) :: pdims_remote
118
119	LOGICAL :: found
120
121	!
122	!-- Get the number of OpenMP threads
123	!$OMP PARALLEL
124	#if defined( __intel_openmp_bug )
125	threads_per_task = omp_get_num_threads()
126	#else
127	!$ threads_per_task = omp_get_num_threads()
128	#endif
129	!$OMP END PARALLEL
130
131
132	#if defined( __parallel )
133
134	!
135	!-- Determine the processor topology or check it, if prescribed by the user
136	IF ( npex == -1 .AND. npey == -1 ) THEN
137
138	!
139	!-- Automatic determination of the topology
140	!-- The default on SMP- and cluster-hosts is a 1d-decomposition along x
141	IF ( host(1:3) == 'ibm' .OR. host(1:3) == 'nec' .OR. &
142	( host(1:2) == 'lc' .AND. host(3:5) /= 'sgi' .AND. &
143	host(3:4) /= 'xt' .AND. host(3:5) /= 'tit' .AND. &
144	host(3:6) /= 'flow' ) .OR. host(1:3) == 'dec' ) THEN
145
146	pdims(1) = numprocs
147	pdims(2) = 1
148
149	ELSE
150
151	numproc_sqr = SQRT( REAL( numprocs ) )
152	pdims(1) = MAX( numproc_sqr , 1 )
153	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
154	pdims(1) = pdims(1) - 1
155	ENDDO
156	pdims(2) = numprocs / pdims(1)
157
158	ENDIF
159
160	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
161
162	!
163	!-- Prescribed by user. Number of processors on the prescribed topology
164	!-- must be equal to the number of PEs available to the job
165	IF ( ( npex * npey ) /= numprocs ) THEN
166	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
167	'topology (', npex*npey,') does not match & the number of ', &
168	'PEs available to the job (', numprocs, ')'
169	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
170	ENDIF
171	pdims(1) = npex
172	pdims(2) = npey
173
174	ELSE
175	!
176	!-- If the processor topology is prescribed by the user, the number of
177	!-- PEs must be given in both directions
178	message_string = 'if the processor topology is prescribed by the, ' // &
179	' user& both values of "npex" and "npey" must be given ' // &
180	'in the &NAMELIST-parameter file'
181	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
182
183	ENDIF
184
185	!
186	!-- The hybrid solver can only be used in case of a 1d-decomposition along x
187	IF ( pdims(2) /= 1 .AND. psolver == 'poisfft_hybrid' ) THEN
188	message_string = 'psolver = "poisfft_hybrid" can only be' // &
189	'& used in case of a 1d-decomposition along x'
190	CALL message( 'init_pegrid', 'PA0223', 1, 2, 0, 6, 0 )
191	ENDIF
192
193	!
194	!-- For communication speedup, set barriers in front of collective
195	!-- communications by default on SGI-type systems
196	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
197
198	!
199	!-- If necessary, set horizontal boundary conditions to non-cyclic
200	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
201	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
202
203	!
204	!-- Create the virtual processor grid
205	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
206	comm2d, ierr )
207	CALL MPI_COMM_RANK( comm2d, myid, ierr )
208	WRITE (myid_char,'(''_'',I4.4)') myid
209
210	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
211	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
212	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
213
214	!
215	!-- Determine sub-topologies for transpositions
216	!-- Transposition from z to x:
217	remain_dims(1) = .TRUE.
218	remain_dims(2) = .FALSE.
219	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
220	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
221	!
222	!-- Transposition from x to y
223	remain_dims(1) = .FALSE.
224	remain_dims(2) = .TRUE.
225	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
226	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
227
228
229	!
230	!-- Find a grid (used for array d) which will match the transposition demands
231	IF ( grid_matching == 'strict' ) THEN
232
233	nxa = nx; nya = ny; nza = nz
234
235	ELSE
236
237	found = .FALSE.
238	xn: DO nxa = nx, 2*nx
239	!
240	!-- Meet conditions for nx
241	IF ( MOD( nxa+1, pdims(1) ) /= 0 .OR. &
242	MOD( nxa+1, pdims(2) ) /= 0 ) CYCLE xn
243
244	yn: DO nya = ny, 2*ny
245	!
246	!-- Meet conditions for ny
247	IF ( MOD( nya+1, pdims(2) ) /= 0 .OR. &
248	MOD( nya+1, pdims(1) ) /= 0 ) CYCLE yn
249
250
251	zn: DO nza = nz, 2*nz
252	!
253	!-- Meet conditions for nz
254	IF ( ( MOD( nza, pdims(1) ) /= 0 .AND. pdims(1) /= 1 .AND. &
255	pdims(2) /= 1 ) .OR. &
256	( MOD( nza, pdims(2) ) /= 0 .AND. dt_dosp /= 9999999.9 &
257	) ) THEN
258	CYCLE zn
259	ELSE
260	found = .TRUE.
261	EXIT xn
262	ENDIF
263
264	ENDDO zn
265
266	ENDDO yn
267
268	ENDDO xn
269
270	IF ( .NOT. found ) THEN
271	message_string = 'no matching grid for transpositions found'
272	CALL message( 'init_pegrid', 'PA0224', 1, 2, 0, 6, 0 )
273	ENDIF
274
275	ENDIF
276
277	!
278	!-- Calculate array bounds in x-direction for every PE.
279	!-- The last PE along x may get less grid points than the others
280	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
281	nysf(0:pdims(2)-1), nnx_pe(0:pdims(1)-1), nny_pe(0:pdims(2)-1) )
282
283	IF ( MOD( nxa+1 , pdims(1) ) /= 0 ) THEN
284	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
285	'is not an& integral divisor of the number ', &
286	'processors (', pdims(1),')'
287	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
288	ELSE
289	nnx = ( nxa + 1 ) / pdims(1)
290	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
291	WRITE( message_string, * ) 'x-direction: nx does not match the', &
292	'requirements given by the number of PEs &used', &
293	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
294	- ( nx + 1 ) ) ), ' instead of nx =', nx
295	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
296	ENDIF
297	ENDIF
298
299	!
300	!-- Left and right array bounds, number of gridpoints
301	DO i = 0, pdims(1)-1
302	nxlf(i) = i * nnx
303	nxrf(i) = ( i + 1 ) * nnx - 1
304	nnx_pe(i) = MIN( nx, nxrf(i) ) - nxlf(i) + 1
305	ENDDO
306
307	!
308	!-- Calculate array bounds in y-direction for every PE.
309	IF ( MOD( nya+1 , pdims(2) ) /= 0 ) THEN
310	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
311	'is not an& integral divisor of the number of', &
312	'processors (', pdims(2),')'
313	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
314	ELSE
315	nny = ( nya + 1 ) / pdims(2)
316	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
317	WRITE( message_string, * ) 'y-direction: ny does not match the', &
318	'requirements given by the number of PEs &used ', &
319	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
320	- ( ny + 1 ) ) ), ' instead of ny =', ny
321	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
322	ENDIF
323	ENDIF
324
325	!
326	!-- South and north array bounds
327	DO j = 0, pdims(2)-1
328	nysf(j) = j * nny
329	nynf(j) = ( j + 1 ) * nny - 1
330	nny_pe(j) = MIN( ny, nynf(j) ) - nysf(j) + 1
331	ENDDO
332
333	!
334	!-- Local array bounds of the respective PEs
335	nxl = nxlf(pcoord(1))
336	nxra = nxrf(pcoord(1))
337	nxr = MIN( nx, nxra )
338	nys = nysf(pcoord(2))
339	nyna = nynf(pcoord(2))
340	nyn = MIN( ny, nyna )
341	nzb = 0
342	nzta = nza
343	nzt = MIN( nz, nzta )
344	nnz = nza
345
346	!
347	!-- Set switches to define if the PE is situated at the border of the virtual
348	!-- processor grid
349	IF ( nxl == 0 ) left_border_pe = .TRUE.
350	IF ( nxr == nx ) right_border_pe = .TRUE.
351	IF ( nys == 0 ) south_border_pe = .TRUE.
352	IF ( nyn == ny ) north_border_pe = .TRUE.
353
354	!
355	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
356	!-- (needed in the pressure solver)
357	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
358	!-- boundaries are omitted, because they are obstructive to the transposition
359
360	!
361	!-- 1. transposition z --> x
362	!-- This transposition is not neccessary in case of a 1d-decomposition along x,
363	!-- except that the uptream-spline method is switched on
364	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
365	scalar_advec == 'ups-scheme' ) THEN
366
367	IF ( pdims(2) == 1 .AND. ( momentum_advec == 'ups-scheme' .OR. &
368	scalar_advec == 'ups-scheme' ) ) THEN
369	message_string = '1d-decomposition along x ' // &
370	'chosen but nz restrictions may occur' // &
371	'& since ups-scheme is activated'
372	CALL message( 'init_pegrid', 'PA0229', 0, 1, 0, 6, 0 )
373	ENDIF
374	nys_x = nys
375	nyn_xa = nyna
376	nyn_x = nyn
377	nny_x = nny
378	IF ( MOD( nza , pdims(1) ) /= 0 ) THEN
379	WRITE( message_string, * ) 'transposition z --> x:', &
380	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
381	pdims(1)
382	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
383	ENDIF
384	nnz_x = nza / pdims(1)
385	nzb_x = 1 + myidx * nnz_x
386	nzt_xa = ( myidx + 1 ) * nnz_x
387	nzt_x = MIN( nzt, nzt_xa )
388
389	sendrecvcount_zx = nnx * nny * nnz_x
390
391	ELSE
392	!
393	!--- Setting of dummy values because otherwise variables are undefined in
394	!--- the next step x --> y
395	!--- WARNING: This case has still to be clarified!!!!!!!!!!!!
396	nnz_x = 1
397	nzb_x = 1
398	nzt_xa = 1
399	nzt_x = 1
400	nny_x = nny
401
402	ENDIF
403
404	!
405	!-- 2. transposition x --> y
406	nnz_y = nnz_x
407	nzb_y = nzb_x
408	nzt_ya = nzt_xa
409	nzt_y = nzt_x
410	IF ( MOD( nxa+1 , pdims(2) ) /= 0 ) THEN
411	WRITE( message_string, * ) 'transposition x --> y:', &
412	'&nx+1=',nx+1,' is not an integral divisor of ',&
413	'pdims(2)=',pdims(2)
414	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
415	ENDIF
416	nnx_y = (nxa+1) / pdims(2)
417	nxl_y = myidy * nnx_y
418	nxr_ya = ( myidy + 1 ) * nnx_y - 1
419	nxr_y = MIN( nx, nxr_ya )
420
421	sendrecvcount_xy = nnx_y * nny_x * nnz_y
422
423	!
424	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
425	!-- along x)
426	IF ( pdims(2) /= 1 .OR. momentum_advec == 'ups-scheme' .OR. &
427	scalar_advec == 'ups-scheme' ) THEN
428	!
429	!-- y --> z
430	!-- This transposition is not neccessary in case of a 1d-decomposition
431	!-- along x, except that the uptream-spline method is switched on
432	nnx_z = nnx_y
433	nxl_z = nxl_y
434	nxr_za = nxr_ya
435	nxr_z = nxr_y
436	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
437	WRITE( message_string, * ) 'transposition y --> z:', &
438	'& ny+1=',ny+1,' is not an integral divisor of ',&
439	'pdims(1)=',pdims(1)
440	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
441	ENDIF
442	nny_z = (nya+1) / pdims(1)
443	nys_z = myidx * nny_z
444	nyn_za = ( myidx + 1 ) * nny_z - 1
445	nyn_z = MIN( ny, nyn_za )
446
447	sendrecvcount_yz = nnx_y * nny_z * nnz_y
448
449	ELSE
450	!
451	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
452	IF ( MOD( nya+1 , pdims(1) ) /= 0 ) THEN
453	WRITE( message_string, * ) 'transposition x --> y:', &
454	'& ny+1=',ny+1,' is not an integral divisor of ',&
455	'pdims(1)=',pdims(1)
456	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
457	ENDIF
458
459	ENDIF
460
461	!
462	!-- Indices for direct transpositions z --> y (used for calculating spectra)
463	IF ( dt_dosp /= 9999999.9 ) THEN
464	IF ( MOD( nza, pdims(2) ) /= 0 ) THEN
465	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
466	'for spectra):& nz=',nz,' is not an integral divisor of ',&
467	'pdims(2)=',pdims(2)
468	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
469	ELSE
470	nxl_yd = nxl
471	nxr_yda = nxra
472	nxr_yd = nxr
473	nzb_yd = 1 + myidy * ( nza / pdims(2) )
474	nzt_yda = ( myidy + 1 ) * ( nza / pdims(2) )
475	nzt_yd = MIN( nzt, nzt_yda )
476
477	sendrecvcount_zyd = nnx * nny * ( nza / pdims(2) )
478	ENDIF
479	ENDIF
480
481	!
482	!-- Indices for direct transpositions y --> x (they are only possible in case
483	!-- of a 1d-decomposition along x)
484	IF ( pdims(2) == 1 ) THEN
485	nny_x = nny / pdims(1)
486	nys_x = myid * nny_x
487	nyn_xa = ( myid + 1 ) * nny_x - 1
488	nyn_x = MIN( ny, nyn_xa )
489	nzb_x = 1
490	nzt_xa = nza
491	nzt_x = nz
492	sendrecvcount_xy = nnx * nny_x * nza
493	ENDIF
494
495	!
496	!-- Indices for direct transpositions x --> y (they are only possible in case
497	!-- of a 1d-decomposition along y)
498	IF ( pdims(1) == 1 ) THEN
499	nnx_y = nnx / pdims(2)
500	nxl_y = myid * nnx_y
501	nxr_ya = ( myid + 1 ) * nnx_y - 1
502	nxr_y = MIN( nx, nxr_ya )
503	nzb_y = 1
504	nzt_ya = nza
505	nzt_y = nz
506	sendrecvcount_xy = nnx_y * nny * nza
507	ENDIF
508
509	!
510	!-- Arrays for storing the array bounds are needed any more
511	DEALLOCATE( nxlf , nxrf , nynf , nysf )
512
513	!
514	!-- Collect index bounds from other PEs (to be written to restart file later)
515	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
516
517	IF ( myid == 0 ) THEN
518
519	hor_index_bounds(1,0) = nxl
520	hor_index_bounds(2,0) = nxr
521	hor_index_bounds(3,0) = nys
522	hor_index_bounds(4,0) = nyn
523
524	!
525	!-- Receive data from all other PEs
526	DO i = 1, numprocs-1
527	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
528	ierr )
529	hor_index_bounds(:,i) = ibuf(1:4)
530	ENDDO
531
532	ELSE
533	!
534	!-- Send index bounds to PE0
535	ibuf(1) = nxl
536	ibuf(2) = nxr
537	ibuf(3) = nys
538	ibuf(4) = nyn
539	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
540
541	ENDIF
542
543	#if defined( __print )
544	!
545	!-- Control output
546	IF ( myid == 0 ) THEN
547	PRINT, ' processor topology *'
548	PRINT*, ' '
549	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
550	&' nys: nyn'
551	PRINT*, '------------------------------------------------------------',&
552	&'-----------'
553	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
554	myidx, myidy, nxl, nxr, nys, nyn
555	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
556	2(2X,I4,':',I4))
557
558	!
559	!-- Receive data from the other PEs
560	DO i = 1,numprocs-1
561	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
562	ierr )
563	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
564	ENDDO
565	ELSE
566
567	!
568	!-- Send data to PE0
569	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
570	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
571	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
572	ibuf(12) = nyn
573	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
574	ENDIF
575	#endif
576
577	#if defined( __parallel )
578	#if defined( __mpi2 )
579	!
580	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
581	!-- and pass it to PE0 of the ocean model
582	IF ( myid == 0 ) THEN
583
584	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
585
586	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
587
588	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
589	ierr )
590
591	!
592	!-- Write a flag file for the ocean model and the other atmosphere
593	!-- processes.
594	!-- There seems to be a bug in MPICH2 which causes hanging processes
595	!-- in case that execution of LOOKUP_NAME is continued too early
596	!-- (i.e. before the port has been created)
597	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
598	WRITE ( 90, '(''TRUE'')' )
599	CLOSE ( 90 )
600
601	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
602
603	!
604	!-- Continue only if the atmosphere model has created the port.
605	!-- There seems to be a bug in MPICH2 which causes hanging processes
606	!-- in case that execution of LOOKUP_NAME is continued too early
607	!-- (i.e. before the port has been created)
608	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
609	DO WHILE ( .NOT. found )
610	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
611	ENDDO
612
613	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
614
615	ENDIF
616
617	ENDIF
618
619	!
620	!-- In case of coupled runs, establish the connection between the atmosphere
621	!-- and the ocean model and define the intercommunicator (comm_inter)
622	CALL MPI_BARRIER( comm2d, ierr )
623	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
624
625	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
626	comm_inter, ierr )
627	coupling_mode_remote = 'ocean_to_atmosphere'
628
629	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
630
631	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
632	comm_inter, ierr )
633	coupling_mode_remote = 'atmosphere_to_ocean'
634
635	ENDIF
636	#endif
637
638	!
639	!-- Determine the number of ghost point layers
640	IF ( scalar_advec == 'ws-scheme' .OR. momentum_advec == 'ws-scheme' ) THEN
641	nbgp = 3
642	ELSE
643	nbgp = 1
644	ENDIF
645
646	!
647	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
648	!-- which is needed for coupled atmosphere-ocean runs.
649	!-- First, calculate number of grid points of an xy-plane.
650	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
651	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
652	CALL MPI_TYPE_COMMIT( type_xy, ierr )
653
654	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
655
656	!
657	!-- Pass the number of grid points of the atmosphere model to
658	!-- the ocean model and vice versa
659	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
660
661	nx_a = nx
662	ny_a = ny
663
664	IF ( myid == 0 ) THEN
665
666	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
667	ierr )
668	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
669	ierr )
670	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
671	ierr )
672	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
673	status, ierr )
674	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
675	status, ierr )
676	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
677	comm_inter, status, ierr )
678	ENDIF
679
680	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
681	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
682	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
683
684	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
685
686	nx_o = nx
687	ny_o = ny
688
689	IF ( myid == 0 ) THEN
690
691	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
692	ierr )
693	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
694	ierr )
695	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
696	status, ierr )
697	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
698	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
699	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
700	ENDIF
701
702	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
703	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
704	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
705
706	ENDIF
707
708	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
709	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
710
711	!
712	!-- Determine if the horizontal grid and the number of PEs in ocean and
713	!-- atmosphere is same or not
714	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
715	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
716	THEN
717	coupling_topology = 0
718	ELSE
719	coupling_topology = 1
720	ENDIF
721
722	!
723	!-- Determine the target PEs for the exchange between ocean and
724	!-- atmosphere (comm2d)
725	IF ( coupling_topology == 0 ) THEN
726	!
727	!-- In case of identical topologies, every atmosphere PE has exactly one
728	!-- ocean PE counterpart and vice versa
729	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
730	target_id = myid + numprocs
731	ELSE
732	target_id = myid
733	ENDIF
734
735	ELSE
736	!
737	!-- In case of nonequivalent topology in ocean and atmosphere only for
738	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
739	!-- data echxchange between ocean and atmosphere will be done only
740	!-- between these PEs.
741	IF ( myid == 0 ) THEN
742
743	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
744	target_id = numprocs
745	ELSE
746	target_id = 0
747	ENDIF
748
749	ENDIF
750
751	ENDIF
752
753	ENDIF
754
755
756	#endif
757
758	#else
759
760	!
761	!-- Array bounds when running on a single PE (respectively a non-parallel
762	!-- machine)
763	nxl = 0
764	nxr = nx
765	nxra = nx
766	nnx = nxr - nxl + 1
767	nys = 0
768	nyn = ny
769	nyna = ny
770	nny = nyn - nys + 1
771	nzb = 0
772	nzt = nz
773	nzta = nz
774	nnz = nz
775
776	ALLOCATE( hor_index_bounds(4,0:0) )
777	hor_index_bounds(1,0) = nxl
778	hor_index_bounds(2,0) = nxr
779	hor_index_bounds(3,0) = nys
780	hor_index_bounds(4,0) = nyn
781
782	!
783	!-- Array bounds for the pressure solver (in the parallel code, these bounds
784	!-- are the ones for the transposed arrays)
785	nys_x = nys
786	nyn_x = nyn
787	nyn_xa = nyn
788	nzb_x = nzb + 1
789	nzt_x = nzt
790	nzt_xa = nzt
791
792	nxl_y = nxl
793	nxr_y = nxr
794	nxr_ya = nxr
795	nzb_y = nzb + 1
796	nzt_y = nzt
797	nzt_ya = nzt
798
799	nxl_z = nxl
800	nxr_z = nxr
801	nxr_za = nxr
802	nys_z = nys
803	nyn_z = nyn
804	nyn_za = nyn
805
806	#endif
807
808	!
809	!-- Calculate number of grid levels necessary for the multigrid poisson solver
810	!-- as well as the gridpoint indices on each level
811	IF ( psolver == 'multigrid' ) THEN
812
813	!
814	!-- First calculate number of possible grid levels for the subdomains
815	mg_levels_x = 1
816	mg_levels_y = 1
817	mg_levels_z = 1
818
819	i = nnx
820	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
821	i = i / 2
822	mg_levels_x = mg_levels_x + 1
823	ENDDO
824
825	j = nny
826	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
827	j = j / 2
828	mg_levels_y = mg_levels_y + 1
829	ENDDO
830
831	k = nz ! do not use nnz because it might be > nz due to transposition
832	! requirements
833	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
834	k = k / 2
835	mg_levels_z = mg_levels_z + 1
836	ENDDO
837
838	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
839
840	!
841	!-- Find out, if the total domain allows more levels. These additional
842	!-- levels are identically processed on all PEs.
843	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
844
845	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
846
847	mg_switch_to_pe0_level_l = maximum_grid_level
848
849	mg_levels_x = 1
850	mg_levels_y = 1
851
852	i = nx+1
853	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
854	i = i / 2
855	mg_levels_x = mg_levels_x + 1
856	ENDDO
857
858	j = ny+1
859	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
860	j = j / 2
861	mg_levels_y = mg_levels_y + 1
862	ENDDO
863
864	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
865
866	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
867	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
868	mg_switch_to_pe0_level_l + 1
869	ELSE
870	mg_switch_to_pe0_level_l = 0
871	ENDIF
872
873	ELSE
874
875	mg_switch_to_pe0_level_l = 0
876	maximum_grid_level_l = maximum_grid_level
877
878	ENDIF
879
880	!
881	!-- Use switch level calculated above only if it is not pre-defined
882	!-- by user
883	IF ( mg_switch_to_pe0_level == 0 ) THEN
884
885	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
886	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
887	maximum_grid_level = maximum_grid_level_l
888	ENDIF
889
890	ELSE
891	!
892	!-- Check pre-defined value and reset to default, if neccessary
893	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
894	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
895	message_string = 'mg_switch_to_pe0_level ' // &
896	'out of range and reset to default (=0)'
897	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
898	mg_switch_to_pe0_level = 0
899	ELSE
900	!
901	!-- Use the largest number of possible levels anyway and recalculate
902	!-- the switch level to this largest number of possible values
903	maximum_grid_level = maximum_grid_level_l
904
905	ENDIF
906
907	ENDIF
908
909	ENDIF
910
911	ALLOCATE( grid_level_count(maximum_grid_level), &
912	nxl_mg(maximum_grid_level), nxr_mg(maximum_grid_level), &
913	nyn_mg(maximum_grid_level), nys_mg(maximum_grid_level), &
914	nzt_mg(maximum_grid_level) )
915
916	grid_level_count = 0
917	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
918
919	DO i = maximum_grid_level, 1 , -1
920
921	IF ( i == mg_switch_to_pe0_level ) THEN
922	#if defined( __parallel )
923	!
924	!-- Save the grid size of the subdomain at the switch level, because
925	!-- it is needed in poismg.
926	ind(1) = nxl_l; ind(2) = nxr_l
927	ind(3) = nys_l; ind(4) = nyn_l
928	ind(5) = nzt_l
929	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
930	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
931	MPI_INTEGER, comm2d, ierr )
932	DO j = 0, numprocs-1
933	DO k = 1, 5
934	mg_loc_ind(k,j) = ind_all(k+j*5)
935	ENDDO
936	ENDDO
937	DEALLOCATE( ind_all )
938	!
939	!-- Calculate the grid size of the total domain
940	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
941	nxl_l = 0
942	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
943	nys_l = 0
944	!
945	!-- The size of this gathered array must not be larger than the
946	!-- array tend, which is used in the multigrid scheme as a temporary
947	!-- array
948	subdomain_size = ( nxr - nxl + 3 ) * ( nyn - nys + 3 ) * &
949	( nzt - nzb + 2 )
950	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
951	( nzt_l - nzb + 2 )
952
953	IF ( gathered_size > subdomain_size ) THEN
954	message_string = 'not enough memory for storing ' // &
955	'gathered multigrid data on PE0'
956	CALL message( 'init_pegrid', 'PA0236', 1, 2, 0, 6, 0 )
957	ENDIF
958	#else
959	message_string = 'multigrid gather/scatter impossible ' // &
960	'in non parallel mode'
961	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
962	#endif
963	ENDIF
964
965	nxl_mg(i) = nxl_l
966	nxr_mg(i) = nxr_l
967	nys_mg(i) = nys_l
968	nyn_mg(i) = nyn_l
969	nzt_mg(i) = nzt_l
970
971	nxl_l = nxl_l / 2
972	nxr_l = nxr_l / 2
973	nys_l = nys_l / 2
974	nyn_l = nyn_l / 2
975	nzt_l = nzt_l / 2
976	ENDDO
977
978	ELSE
979
980	maximum_grid_level = 0
981
982	ENDIF
983
984	!
985	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
986	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
987	!-- is required.
988	grid_level = 0
989
990	#if defined( __parallel )
991	!
992	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
993	ngp_y = nyn - nys + 1 + 2 * nbgp
994
995	!
996	!-- Define new MPI derived datatypes for the exchange of ghost points in
997	!-- x- and y-direction for 2D-arrays (line)
998	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
999	ierr )
1000	CALL MPI_TYPE_COMMIT( type_x, ierr )
1001	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
1002	type_x_int, ierr )
1003	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
1004
1005	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
1006	CALL MPI_TYPE_COMMIT( type_y, ierr )
1007	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
1008	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
1009
1010
1011	!
1012	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1013	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1014	!-- exchange of ghost points in y-direction (xz-plane).
1015	!-- Do these calculations for the model grid and (if necessary) also
1016	!-- for the coarser grid levels used in the multigrid method
1017	ALLOCATE ( ngp_yz(0:maximum_grid_level), type_xz(0:maximum_grid_level),&
1018	type_yz(0:maximum_grid_level) )
1019
1020	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1021
1022	!
1023	!-- Discern between the model grid, which needs nbgp ghost points and
1024	!-- grid levels for the multigrid scheme. In the latter case only one
1025	!-- ghost point is necessary.
1026	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1027	!-- grid. The following loop is needed for data exchange in poismg.f90.
1028	!
1029	!-- Determine number of grid points of yz-layer for exchange
1030	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1031
1032	!
1033	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1034	!-- Although data are contiguous in physical memory (which does not
1035	!-- necessarily require an MPI-derived datatype), the data exchange between
1036	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1037	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1038	MPI_REAL, type_xz(0), ierr )
1039	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1040
1041	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1042	ierr )
1043	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1044
1045	!
1046	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1047	IF ( psolver == 'multigrid' ) THEN
1048	!
1049	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1050	DO i = maximum_grid_level, 1 , -1
1051
1052	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1053
1054	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1055	MPI_REAL, type_xz(i), ierr )
1056	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1057
1058	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1059	ierr )
1060	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1061
1062	nxl_l = nxl_l / 2
1063	nxr_l = nxr_l / 2
1064	nys_l = nys_l / 2
1065	nyn_l = nyn_l / 2
1066	nzt_l = nzt_l / 2
1067
1068	ENDDO
1069
1070	ENDIF
1071	#endif
1072
1073	#if defined( __parallel )
1074	!
1075	!-- Setting of flags for inflow/outflow conditions in case of non-cyclic
1076	!-- horizontal boundary conditions.
1077	IF ( pleft == MPI_PROC_NULL ) THEN
1078	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1079	inflow_l = .TRUE.
1080	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1081	outflow_l = .TRUE.
1082	ENDIF
1083	ENDIF
1084
1085	IF ( pright == MPI_PROC_NULL ) THEN
1086	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1087	outflow_r = .TRUE.
1088	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1089	inflow_r = .TRUE.
1090	ENDIF
1091	ENDIF
1092
1093	IF ( psouth == MPI_PROC_NULL ) THEN
1094	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1095	outflow_s = .TRUE.
1096	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1097	inflow_s = .TRUE.
1098	ENDIF
1099	ENDIF
1100
1101	IF ( pnorth == MPI_PROC_NULL ) THEN
1102	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1103	inflow_n = .TRUE.
1104	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1105	outflow_n = .TRUE.
1106	ENDIF
1107	ENDIF
1108
1109	!
1110	!-- Broadcast the id of the inflow PE
1111	IF ( inflow_l ) THEN
1112	id_inflow_l = myidx
1113	ELSE
1114	id_inflow_l = 0
1115	ENDIF
1116	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1117	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1118	comm1dx, ierr )
1119
1120	!
1121	!-- Broadcast the id of the recycling plane
1122	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1123	IF ( ( recycling_width / dx ) >= nxl .AND. &
1124	( recycling_width / dx ) <= nxr ) THEN
1125	id_recycling_l = myidx
1126	ELSE
1127	id_recycling_l = 0
1128	ENDIF
1129	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1130	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1131	comm1dx, ierr )
1132
1133	#else
1134	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1135	inflow_l = .TRUE.
1136	outflow_r = .TRUE.
1137	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1138	outflow_l = .TRUE.
1139	inflow_r = .TRUE.
1140	ENDIF
1141
1142	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1143	inflow_n = .TRUE.
1144	outflow_s = .TRUE.
1145	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1146	outflow_n = .TRUE.
1147	inflow_s = .TRUE.
1148	ENDIF
1149	#endif
1150	!
1151	!-- At the outflow, u or v, respectively, have to be calculated for one more
1152	!-- grid point.
1153	IF ( outflow_l ) THEN
1154	nxlu = nxl + 1
1155	ELSE
1156	nxlu = nxl
1157	ENDIF
1158	IF ( outflow_s ) THEN
1159	nysv = nys + 1
1160	ELSE
1161	nysv = nys
1162	ENDIF
1163
1164	IF ( psolver == 'poisfft_hybrid' ) THEN
1165	CALL poisfft_hybrid_ini
1166	ELSEIF ( psolver == 'poisfft' ) THEN
1167	CALL poisfft_init
1168	ENDIF
1169
1170	!
1171	!-- Allocate wall flag arrays used in the multigrid solver
1172	IF ( psolver == 'multigrid' ) THEN
1173
1174	DO i = maximum_grid_level, 1, -1
1175
1176	SELECT CASE ( i )
1177
1178	CASE ( 1 )
1179	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1180	nys_mg(i)-1:nyn_mg(i)+1, &
1181	nxl_mg(i)-1:nxr_mg(i)+1) )
1182
1183	CASE ( 2 )
1184	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1185	nys_mg(i)-1:nyn_mg(i)+1, &
1186	nxl_mg(i)-1:nxr_mg(i)+1) )
1187
1188	CASE ( 3 )
1189	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1190	nys_mg(i)-1:nyn_mg(i)+1, &
1191	nxl_mg(i)-1:nxr_mg(i)+1) )
1192
1193	CASE ( 4 )
1194	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1195	nys_mg(i)-1:nyn_mg(i)+1, &
1196	nxl_mg(i)-1:nxr_mg(i)+1) )
1197
1198	CASE ( 5 )
1199	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1200	nys_mg(i)-1:nyn_mg(i)+1, &
1201	nxl_mg(i)-1:nxr_mg(i)+1) )
1202
1203	CASE ( 6 )
1204	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1205	nys_mg(i)-1:nyn_mg(i)+1, &
1206	nxl_mg(i)-1:nxr_mg(i)+1) )
1207
1208	CASE ( 7 )
1209	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1210	nys_mg(i)-1:nyn_mg(i)+1, &
1211	nxl_mg(i)-1:nxr_mg(i)+1) )
1212
1213	CASE ( 8 )
1214	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1215	nys_mg(i)-1:nyn_mg(i)+1, &
1216	nxl_mg(i)-1:nxr_mg(i)+1) )
1217
1218	CASE ( 9 )
1219	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1220	nys_mg(i)-1:nyn_mg(i)+1, &
1221	nxl_mg(i)-1:nxr_mg(i)+1) )
1222
1223	CASE ( 10 )
1224	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1225	nys_mg(i)-1:nyn_mg(i)+1, &
1226	nxl_mg(i)-1:nxr_mg(i)+1) )
1227
1228	CASE DEFAULT
1229	message_string = 'more than 10 multigrid levels'
1230	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1231
1232	END SELECT
1233
1234	ENDDO
1235
1236	ENDIF
1237
1238	END SUBROUTINE init_pegrid

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