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source: palm/trunk/SOURCE/init_pegrid.f90 @ 668

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

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