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source: palm/trunk/SOURCE/init_pegrid.f90 @ 722

Last change on this file since 722 was 722, checked in by raasch, 13 years ago
bugfixes for r707 concerning multigrid method for non-cyclic boundary conditions
Property svn:keywords set to `Id`
File size: 40.6 KB

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

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