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source: palm/trunk/SOURCE/init_pegrid.f90 @ 1762

Last change on this file since 1762 was 1762, checked in by hellstea, 8 years ago
Introduction of nested domain system
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1	!> @file init_pegrid.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2014 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	! Introduction of nested domain feature
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: init_pegrid.f90 1762 2016-02-25 12:31:13Z hellstea $
26	!
27	! 1682 2015-10-07 23:56:08Z knoop
28	! Code annotations made doxygen readable
29	!
30	! 1677 2015-10-02 13:25:23Z boeske
31	! New MPI-data types for exchange of 3D integer arrays.
32	!
33	! 1575 2015-03-27 09:56:27Z raasch
34	! adjustments for psolver-queries, calculation of ngp_xz added
35	!
36	! 1565 2015-03-09 20:59:31Z suehring
37	! Refine if-clause for setting nbgp.
38	!
39	! 1557 2015-03-05 16:43:04Z suehring
40	! Adjustment for monotonic limiter
41	!
42	! 1468 2014-09-24 14:06:57Z maronga
43	! Adapted for use on up to 6-digit processor cores
44	!
45	! 1435 2014-07-21 10:37:02Z keck
46	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
47	!
48	! 1402 2014-05-09 14:25:13Z raasch
49	! location messages modified
50	!
51	! 1384 2014-05-02 14:31:06Z raasch
52	! location messages added
53	!
54	! 1353 2014-04-08 15:21:23Z heinze
55	! REAL constants provided with KIND-attribute
56	!
57	! 1322 2014-03-20 16:38:49Z raasch
58	! REAL functions provided with KIND-attribute
59	!
60	! 1320 2014-03-20 08:40:49Z raasch
61	! ONLY-attribute added to USE-statements,
62	! kind-parameters added to all INTEGER and REAL declaration statements,
63	! kinds are defined in new module kinds,
64	! revision history before 2012 removed,
65	! comment fields (!:) to be used for variable explanations added to
66	! all variable declaration statements
67	!
68	! 1304 2014-03-12 10:29:42Z raasch
69	! bugfix: single core MPI runs missed some settings of transpose indices
70	!
71	! 1212 2013-08-15 08:46:27Z raasch
72	! error message for poisfft_hybrid removed
73	!
74	! 1159 2013-05-21 11:58:22Z fricke
75	! dirichlet/neumann and neumann/dirichlet removed
76	!
77	! 1139 2013-04-18 07:25:03Z raasch
78	! bugfix for calculating the id of the PE carrying the recycling plane
79	!
80	! 1111 2013-03-08 23:54:10Z raasch
81	! initialization of poisfft moved to module poisfft
82	!
83	! 1092 2013-02-02 11:24:22Z raasch
84	! unused variables removed
85	!
86	! 1056 2012-11-16 15:28:04Z raasch
87	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
88	! p2 as automatic arrays in recursive subroutine next_mg_level
89	!
90	! 1041 2012-11-06 02:36:29Z raasch
91	! a 2d virtual processor topology is used by default for all machines
92	!
93	! 1036 2012-10-22 13:43:42Z raasch
94	! code put under GPL (PALM 3.9)
95	!
96	! 1003 2012-09-14 14:35:53Z raasch
97	! subdomains must have identical size (grid matching = "match" removed)
98	!
99	! 1001 2012-09-13 14:08:46Z raasch
100	! all actions concerning upstream-spline-method removed
101	!
102	! 978 2012-08-09 08:28:32Z fricke
103	! dirichlet/neumann and neumann/dirichlet added
104	! nxlu and nysv are also calculated for inflow boundary
105	!
106	! 809 2012-01-30 13:32:58Z maronga
107	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
108	!
109	! 807 2012-01-25 11:53:51Z maronga
110	! New cpp directive "__check" implemented which is used by check_namelist_files
111	!
112	! Revision 1.1 1997/07/24 11:15:09 raasch
113	! Initial revision
114	!
115	!
116	! Description:
117	! ------------
118	!> Determination of the virtual processor topology (if not prescribed by the
119	!> user)and computation of the grid point number and array bounds of the local
120	!> domains.
121	!------------------------------------------------------------------------------!
122	SUBROUTINE init_pegrid
123
124
125	USE control_parameters, &
126	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
127	coupling_topology, dt_dosp, gathered_size, grid_level, &
128	grid_level_count, host, inflow_l, inflow_n, inflow_r, inflow_s, &
129	io_blocks, io_group, maximum_grid_level, &
130	maximum_parallel_io_streams, message_string, &
131	mg_switch_to_pe0_level, momentum_advec, nest_bound_l, &
132	nest_bound_n, nest_bound_r, nest_bound_s, neutral, psolver, &
133	outflow_l, outflow_n, outflow_r, outflow_s, recycling_width, &
134	scalar_advec, subdomain_size
135
136	USE grid_variables, &
137	ONLY: dx
138
139	USE indices, &
140	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
141	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
142	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
143	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
144	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
145
146	USE kinds
147
148	USE pegrid
149
150	#if defined( PMC_ACTIVE )
151	USE pmc_interface, &
152	ONLY: cpl_npex,cpl_npey
153	#endif
154
155	USE transpose_indices, &
156	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
157	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
158
159	IMPLICIT NONE
160
161	INTEGER(iwp) :: i !<
162	INTEGER(iwp) :: id_inflow_l !<
163	INTEGER(iwp) :: id_recycling_l !<
164	INTEGER(iwp) :: ind(5) !<
165	INTEGER(iwp) :: j !<
166	INTEGER(iwp) :: k !<
167	INTEGER(iwp) :: maximum_grid_level_l !<
168	INTEGER(iwp) :: mg_levels_x !<
169	INTEGER(iwp) :: mg_levels_y !<
170	INTEGER(iwp) :: mg_levels_z !<
171	INTEGER(iwp) :: mg_switch_to_pe0_level_l !<
172	INTEGER(iwp) :: nnx_y !<
173	INTEGER(iwp) :: nnx_z !<
174	INTEGER(iwp) :: nny_x !<
175	INTEGER(iwp) :: nny_z !<
176	INTEGER(iwp) :: nnz_x !<
177	INTEGER(iwp) :: nnz_y !<
178	INTEGER(iwp) :: numproc_sqr !<
179	INTEGER(iwp) :: nxl_l !<
180	INTEGER(iwp) :: nxr_l !<
181	INTEGER(iwp) :: nyn_l !<
182	INTEGER(iwp) :: nys_l !<
183	INTEGER(iwp) :: nzb_l !<
184	INTEGER(iwp) :: nzt_l !<
185	INTEGER(iwp) :: omp_get_num_threads !<
186
187	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !<
188	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !<
189	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !<
190	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !<
191	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !<
192
193	INTEGER(iwp), DIMENSION(2) :: pdims_remote !<
194
195	#if defined( __mpi2 )
196	LOGICAL :: found !<
197	#endif
198
199	!
200	!-- Get the number of OpenMP threads
201	!$OMP PARALLEL
202	#if defined( __intel_openmp_bug )
203	threads_per_task = omp_get_num_threads()
204	#else
205	!$ threads_per_task = omp_get_num_threads()
206	#endif
207	!$OMP END PARALLEL
208
209
210	#if defined( __parallel )
211
212	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
213	.FALSE. )
214	#if defined( PMC_ACTIVE )
215	!
216	!-- In case of nested-domain runs, the processor grid is explicitly given
217	!-- by the user in the nestpar-NAMELIST
218	pdims(1) = cpl_npex
219	pdims(2) = cpl_npey
220	#else
221	!
222	!-- Determine the processor topology or check it, if prescribed by the user
223	IF ( npex == -1 .AND. npey == -1 ) THEN
224
225	!
226	!-- Automatic determination of the topology
227	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
228	pdims(1) = MAX( numproc_sqr , 1 )
229	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
230	pdims(1) = pdims(1) - 1
231	ENDDO
232	pdims(2) = numprocs / pdims(1)
233
234	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
235
236	!
237	!-- Prescribed by user. Number of processors on the prescribed topology
238	!-- must be equal to the number of PEs available to the job
239	IF ( ( npex * npey ) /= numprocs ) THEN
240	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
241	'topology (', npex*npey,') does not match & the number of ', &
242	'PEs available to the job (', numprocs, ')'
243	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
244	ENDIF
245	pdims(1) = npex
246	pdims(2) = npey
247
248	ELSE
249	!
250	!-- If the processor topology is prescribed by the user, the number of
251	!-- PEs must be given in both directions
252	message_string = 'if the processor topology is prescribed by the, ' // &
253	' user& both values of "npex" and "npey" must be given ' // &
254	'in the &NAMELIST-parameter file'
255	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
256
257	ENDIF
258	#endif
259
260	!
261	!-- For communication speedup, set barriers in front of collective
262	!-- communications by default on SGI-type systems
263	IF ( host(3:5) == 'sgi' ) collective_wait = .TRUE.
264
265	!
266	!-- If necessary, set horizontal boundary conditions to non-cyclic
267	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
268	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
269
270
271	#if ! defined( __check)
272	!
273	!-- Create the virtual processor grid
274	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
275	comm2d, ierr )
276	CALL MPI_COMM_RANK( comm2d, myid, ierr )
277	WRITE (myid_char,'(''_'',I6.6)') myid
278
279	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
280	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
281	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
282
283	!
284	!-- Determine sub-topologies for transpositions
285	!-- Transposition from z to x:
286	remain_dims(1) = .TRUE.
287	remain_dims(2) = .FALSE.
288	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
289	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
290	!
291	!-- Transposition from x to y
292	remain_dims(1) = .FALSE.
293	remain_dims(2) = .TRUE.
294	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
295	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
296
297	#endif
298
299	!
300	!-- Calculate array bounds along x-direction for every PE.
301	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
302	nysf(0:pdims(2)-1) )
303
304	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
305	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ',&
306	'is not an& integral divisor of the number ', &
307	'processors (', pdims(1),')'
308	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
309	ELSE
310	nnx = ( nx + 1 ) / pdims(1)
311	IF ( nnx*pdims(1) - ( nx + 1) > nnx ) THEN
312	WRITE( message_string, * ) 'x-direction: nx does not match the', &
313	'requirements given by the number of PEs &used', &
314	'& please use nx = ', nx - ( pdims(1) - ( nnx*pdims(1) &
315	- ( nx + 1 ) ) ), ' instead of nx =', nx
316	CALL message( 'init_pegrid', 'PA0226', 1, 2, 0, 6, 0 )
317	ENDIF
318	ENDIF
319
320	!
321	!-- Left and right array bounds, number of gridpoints
322	DO i = 0, pdims(1)-1
323	nxlf(i) = i * nnx
324	nxrf(i) = ( i + 1 ) * nnx - 1
325	ENDDO
326
327	!
328	!-- Calculate array bounds in y-direction for every PE.
329	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
330	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
331	'is not an& integral divisor of the number of', &
332	'processors (', pdims(2),')'
333	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
334	ELSE
335	nny = ( ny + 1 ) / pdims(2)
336	IF ( nny*pdims(2) - ( ny + 1) > nny ) THEN
337	WRITE( message_string, * ) 'y-direction: ny does not match the', &
338	'requirements given by the number of PEs &used ', &
339	'& please use ny = ', ny - ( pdims(2) - ( nnx*pdims(2) &
340	- ( ny + 1 ) ) ), ' instead of ny =', ny
341	CALL message( 'init_pegrid', 'PA0228', 1, 2, 0, 6, 0 )
342	ENDIF
343	ENDIF
344
345	!
346	!-- South and north array bounds
347	DO j = 0, pdims(2)-1
348	nysf(j) = j * nny
349	nynf(j) = ( j + 1 ) * nny - 1
350	ENDDO
351
352	!
353	!-- Local array bounds of the respective PEs
354	nxl = nxlf(pcoord(1))
355	nxr = nxrf(pcoord(1))
356	nys = nysf(pcoord(2))
357	nyn = nynf(pcoord(2))
358	nzb = 0
359	nzt = nz
360	nnz = nz
361
362	!
363	!-- Set switches to define if the PE is situated at the border of the virtual
364	!-- processor grid
365	IF ( nxl == 0 ) left_border_pe = .TRUE.
366	IF ( nxr == nx ) right_border_pe = .TRUE.
367	IF ( nys == 0 ) south_border_pe = .TRUE.
368	IF ( nyn == ny ) north_border_pe = .TRUE.
369
370	!
371	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
372	!-- (needed in the pressure solver)
373	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
374	!-- boundaries are omitted, because they are obstructive to the transposition
375
376	!
377	!-- 1. transposition z --> x
378	!-- This transposition is not neccessary in case of a 1d-decomposition along x
379	nys_x = nys
380	nyn_x = nyn
381	nny_x = nny
382	nnz_x = nz / pdims(1)
383	nzb_x = 1 + myidx * nnz_x
384	nzt_x = ( myidx + 1 ) * nnz_x
385	sendrecvcount_zx = nnx * nny * nnz_x
386
387	IF ( pdims(2) /= 1 ) THEN
388	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
389	WRITE( message_string, * ) 'transposition z --> x:', &
390	'&nz=',nz,' is not an integral divisior of pdims(1)=', &
391	pdims(1)
392	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
393	ENDIF
394	ENDIF
395
396	!
397	!-- 2. transposition x --> y
398	nnz_y = nnz_x
399	nzb_y = nzb_x
400	nzt_y = nzt_x
401	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
402	WRITE( message_string, * ) 'transposition x --> y:', &
403	'&nx+1=',nx+1,' is not an integral divisor of ',&
404	'pdims(2)=',pdims(2)
405	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
406	ENDIF
407	nnx_y = (nx+1) / pdims(2)
408	nxl_y = myidy * nnx_y
409	nxr_y = ( myidy + 1 ) * nnx_y - 1
410	sendrecvcount_xy = nnx_y * nny_x * nnz_y
411
412	!
413	!-- 3. transposition y --> z (ELSE: x --> y in case of 1D-decomposition
414	!-- along x)
415	nnx_z = nnx_y
416	nxl_z = nxl_y
417	nxr_z = nxr_y
418	nny_z = (ny+1) / pdims(1)
419	nys_z = myidx * nny_z
420	nyn_z = ( myidx + 1 ) * nny_z - 1
421	sendrecvcount_yz = nnx_y * nny_z * nnz_y
422
423	IF ( pdims(2) /= 1 ) 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	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
429	WRITE( message_string, * ) 'transposition y --> z:', &
430	'& ny+1=',ny+1,' is not an integral divisor of ',&
431	'pdims(1)=',pdims(1)
432	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
433	ENDIF
434
435	ELSE
436	!
437	!-- x --> y. This condition must be fulfilled for a 1D-decomposition along x
438	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
439	WRITE( message_string, * ) 'transposition x --> y:', &
440	'& ny+1=',ny+1,' is not an integral divisor of ',&
441	'pdims(1)=',pdims(1)
442	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
443	ENDIF
444
445	ENDIF
446
447	!
448	!-- Indices for direct transpositions z --> y (used for calculating spectra)
449	IF ( dt_dosp /= 9999999.9_wp ) THEN
450	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
451	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
452	'for spectra):& nz=',nz,' is not an integral divisor of ',&
453	'pdims(2)=',pdims(2)
454	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
455	ELSE
456	nxl_yd = nxl
457	nxr_yd = nxr
458	nzb_yd = 1 + myidy * ( nz / pdims(2) )
459	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
460	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
461	ENDIF
462	ENDIF
463
464	!
465	!-- Indices for direct transpositions y --> x (they are only possible in case
466	!-- of a 1d-decomposition along x)
467	IF ( pdims(2) == 1 ) THEN
468	nny_x = nny / pdims(1)
469	nys_x = myid * nny_x
470	nyn_x = ( myid + 1 ) * nny_x - 1
471	nzb_x = 1
472	nzt_x = nz
473	sendrecvcount_xy = nnx * nny_x * nz
474	ENDIF
475
476	!
477	!-- Indices for direct transpositions x --> y (they are only possible in case
478	!-- of a 1d-decomposition along y)
479	IF ( pdims(1) == 1 ) THEN
480	nnx_y = nnx / pdims(2)
481	nxl_y = myid * nnx_y
482	nxr_y = ( myid + 1 ) * nnx_y - 1
483	nzb_y = 1
484	nzt_y = nz
485	sendrecvcount_xy = nnx_y * nny * nz
486	ENDIF
487
488	!
489	!-- Arrays for storing the array bounds are needed any more
490	DEALLOCATE( nxlf , nxrf , nynf , nysf )
491
492
493	#if ! defined( __check)
494	!
495	!-- Collect index bounds from other PEs (to be written to restart file later)
496	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
497
498	IF ( myid == 0 ) THEN
499
500	hor_index_bounds(1,0) = nxl
501	hor_index_bounds(2,0) = nxr
502	hor_index_bounds(3,0) = nys
503	hor_index_bounds(4,0) = nyn
504
505	!
506	!-- Receive data from all other PEs
507	DO i = 1, numprocs-1
508	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
509	ierr )
510	hor_index_bounds(:,i) = ibuf(1:4)
511	ENDDO
512
513	ELSE
514	!
515	!-- Send index bounds to PE0
516	ibuf(1) = nxl
517	ibuf(2) = nxr
518	ibuf(3) = nys
519	ibuf(4) = nyn
520	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
521
522	ENDIF
523
524	#endif
525
526	#if defined( __print )
527	!
528	!-- Control output
529	IF ( myid == 0 ) THEN
530	PRINT, ' processor topology *'
531	PRINT*, ' '
532	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
533	&' nys: nyn'
534	PRINT*, '------------------------------------------------------------',&
535	&'-----------'
536	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
537	myidx, myidy, nxl, nxr, nys, nyn
538	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
539	2(2X,I4,':',I4))
540
541	!
542	!-- Receive data from the other PEs
543	DO i = 1,numprocs-1
544	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
545	ierr )
546	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
547	ENDDO
548	ELSE
549
550	!
551	!-- Send data to PE0
552	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
553	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
554	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
555	ibuf(12) = nyn
556	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
557	ENDIF
558	#endif
559
560	#if defined( __parallel ) && ! defined( __check)
561	#if defined( __mpi2 )
562	!
563	!-- In case of coupled runs, get the port name on PE0 of the atmosphere model
564	!-- and pass it to PE0 of the ocean model
565	IF ( myid == 0 ) THEN
566
567	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
568
569	CALL MPI_OPEN_PORT( MPI_INFO_NULL, port_name, ierr )
570
571	CALL MPI_PUBLISH_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, &
572	ierr )
573
574	!
575	!-- Write a flag file for the ocean model and the other atmosphere
576	!-- processes.
577	!-- There seems to be a bug in MPICH2 which causes hanging processes
578	!-- in case that execution of LOOKUP_NAME is continued too early
579	!-- (i.e. before the port has been created)
580	OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
581	WRITE ( 90, '(''TRUE'')' )
582	CLOSE ( 90 )
583
584	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
585
586	!
587	!-- Continue only if the atmosphere model has created the port.
588	!-- There seems to be a bug in MPICH2 which causes hanging processes
589	!-- in case that execution of LOOKUP_NAME is continued too early
590	!-- (i.e. before the port has been created)
591	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
592	DO WHILE ( .NOT. found )
593	INQUIRE( FILE='COUPLING_PORT_OPENED', EXIST=found )
594	ENDDO
595
596	CALL MPI_LOOKUP_NAME( 'palm_coupler', MPI_INFO_NULL, port_name, ierr )
597
598	ENDIF
599
600	ENDIF
601
602	!
603	!-- In case of coupled runs, establish the connection between the atmosphere
604	!-- and the ocean model and define the intercommunicator (comm_inter)
605	CALL MPI_BARRIER( comm2d, ierr )
606	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
607
608	CALL MPI_COMM_ACCEPT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
609	comm_inter, ierr )
610	coupling_mode_remote = 'ocean_to_atmosphere'
611
612	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
613
614	CALL MPI_COMM_CONNECT( port_name, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &
615	comm_inter, ierr )
616	coupling_mode_remote = 'atmosphere_to_ocean'
617
618	ENDIF
619	#endif
620
621	!
622	!-- Determine the number of ghost point layers
623	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
624	scalar_advec == 'ws-scheme-mono' .OR. &
625	momentum_advec == 'ws-scheme' ) THEN
626	nbgp = 3
627	ELSE
628	nbgp = 1
629	ENDIF
630
631	!
632	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
633	!-- which is needed for coupled atmosphere-ocean runs.
634	!-- First, calculate number of grid points of an xy-plane.
635	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
636	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
637	CALL MPI_TYPE_COMMIT( type_xy, ierr )
638
639	IF ( TRIM( coupling_mode ) /= 'uncoupled' ) THEN
640
641	!
642	!-- Pass the number of grid points of the atmosphere model to
643	!-- the ocean model and vice versa
644	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
645
646	nx_a = nx
647	ny_a = ny
648
649	IF ( myid == 0 ) THEN
650
651	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
652	ierr )
653	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
654	ierr )
655	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
656	ierr )
657	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
658	status, ierr )
659	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
660	status, ierr )
661	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
662	comm_inter, status, ierr )
663	ENDIF
664
665	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
666	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
667	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
668
669	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
670
671	nx_o = nx
672	ny_o = ny
673
674	IF ( myid == 0 ) THEN
675
676	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
677	ierr )
678	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
679	ierr )
680	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
681	status, ierr )
682	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
683	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
684	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
685	ENDIF
686
687	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
688	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
689	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
690
691	ENDIF
692
693	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
694	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
695
696	!
697	!-- Determine if the horizontal grid and the number of PEs in ocean and
698	!-- atmosphere is same or not
699	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
700	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
701	THEN
702	coupling_topology = 0
703	ELSE
704	coupling_topology = 1
705	ENDIF
706
707	!
708	!-- Determine the target PEs for the exchange between ocean and
709	!-- atmosphere (comm2d)
710	IF ( coupling_topology == 0 ) THEN
711	!
712	!-- In case of identical topologies, every atmosphere PE has exactly one
713	!-- ocean PE counterpart and vice versa
714	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
715	target_id = myid + numprocs
716	ELSE
717	target_id = myid
718	ENDIF
719
720	ELSE
721	!
722	!-- In case of nonequivalent topology in ocean and atmosphere only for
723	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
724	!-- data echxchange between ocean and atmosphere will be done only
725	!-- between these PEs.
726	IF ( myid == 0 ) THEN
727
728	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
729	target_id = numprocs
730	ELSE
731	target_id = 0
732	ENDIF
733
734	ENDIF
735
736	ENDIF
737
738	ENDIF
739
740
741	#endif
742
743	#else
744
745	!
746	!-- Array bounds when running on a single PE (respectively a non-parallel
747	!-- machine)
748	nxl = 0
749	nxr = nx
750	nnx = nxr - nxl + 1
751	nys = 0
752	nyn = ny
753	nny = nyn - nys + 1
754	nzb = 0
755	nzt = nz
756	nnz = nz
757
758	ALLOCATE( hor_index_bounds(4,0:0) )
759	hor_index_bounds(1,0) = nxl
760	hor_index_bounds(2,0) = nxr
761	hor_index_bounds(3,0) = nys
762	hor_index_bounds(4,0) = nyn
763
764	!
765	!-- Array bounds for the pressure solver (in the parallel code, these bounds
766	!-- are the ones for the transposed arrays)
767	nys_x = nys
768	nyn_x = nyn
769	nzb_x = nzb + 1
770	nzt_x = nzt
771
772	nxl_y = nxl
773	nxr_y = nxr
774	nzb_y = nzb + 1
775	nzt_y = nzt
776
777	nxl_z = nxl
778	nxr_z = nxr
779	nys_z = nys
780	nyn_z = nyn
781
782	#endif
783
784	!
785	!-- Calculate number of grid levels necessary for the multigrid poisson solver
786	!-- as well as the gridpoint indices on each level
787	IF ( psolver(1:9) == 'multigrid' ) THEN
788
789	!
790	!-- First calculate number of possible grid levels for the subdomains
791	mg_levels_x = 1
792	mg_levels_y = 1
793	mg_levels_z = 1
794
795	i = nnx
796	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
797	i = i / 2
798	mg_levels_x = mg_levels_x + 1
799	ENDDO
800
801	j = nny
802	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
803	j = j / 2
804	mg_levels_y = mg_levels_y + 1
805	ENDDO
806
807	k = nz ! do not use nnz because it might be > nz due to transposition
808	! requirements
809	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
810	k = k / 2
811	mg_levels_z = mg_levels_z + 1
812	ENDDO
813
814	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
815
816	!
817	!-- Find out, if the total domain allows more levels. These additional
818	!-- levels are identically processed on all PEs.
819	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
820
821	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
822
823	mg_switch_to_pe0_level_l = maximum_grid_level
824
825	mg_levels_x = 1
826	mg_levels_y = 1
827
828	i = nx+1
829	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
830	i = i / 2
831	mg_levels_x = mg_levels_x + 1
832	ENDDO
833
834	j = ny+1
835	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
836	j = j / 2
837	mg_levels_y = mg_levels_y + 1
838	ENDDO
839
840	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
841
842	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
843	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
844	mg_switch_to_pe0_level_l + 1
845	ELSE
846	mg_switch_to_pe0_level_l = 0
847	ENDIF
848
849	ELSE
850	mg_switch_to_pe0_level_l = 0
851	maximum_grid_level_l = maximum_grid_level
852
853	ENDIF
854
855	!
856	!-- Use switch level calculated above only if it is not pre-defined
857	!-- by user
858	IF ( mg_switch_to_pe0_level == 0 ) THEN
859	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
860	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
861	maximum_grid_level = maximum_grid_level_l
862	ENDIF
863
864	ELSE
865	!
866	!-- Check pre-defined value and reset to default, if neccessary
867	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
868	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
869	message_string = 'mg_switch_to_pe0_level ' // &
870	'out of range and reset to default (=0)'
871	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
872	mg_switch_to_pe0_level = 0
873	ELSE
874	!
875	!-- Use the largest number of possible levels anyway and recalculate
876	!-- the switch level to this largest number of possible values
877	maximum_grid_level = maximum_grid_level_l
878
879	ENDIF
880
881	ENDIF
882
883	ENDIF
884
885	ALLOCATE( grid_level_count(maximum_grid_level), &
886	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
887	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
888	nzt_mg(0:maximum_grid_level) )
889
890	grid_level_count = 0
891	!
892	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
893	!-- recursive subroutine next_mg_level
894	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
895
896	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
897
898	DO i = maximum_grid_level, 1 , -1
899
900	IF ( i == mg_switch_to_pe0_level ) THEN
901	#if defined( __parallel ) && ! defined( __check )
902	!
903	!-- Save the grid size of the subdomain at the switch level, because
904	!-- it is needed in poismg.
905	ind(1) = nxl_l; ind(2) = nxr_l
906	ind(3) = nys_l; ind(4) = nyn_l
907	ind(5) = nzt_l
908	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
909	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
910	MPI_INTEGER, comm2d, ierr )
911	DO j = 0, numprocs-1
912	DO k = 1, 5
913	mg_loc_ind(k,j) = ind_all(k+j*5)
914	ENDDO
915	ENDDO
916	DEALLOCATE( ind_all )
917	!
918	!-- Calculate the grid size of the total domain
919	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
920	nxl_l = 0
921	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
922	nys_l = 0
923	!
924	!-- The size of this gathered array must not be larger than the
925	!-- array tend, which is used in the multigrid scheme as a temporary
926	!-- array. Therefore the subdomain size of an PE is calculated and
927	!-- the size of the gathered grid. These values are used in
928	!-- routines pres and poismg
929	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
930	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
931	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
932	( nzt_l - nzb + 2 )
933
934	#elif ! defined ( __parallel )
935	message_string = 'multigrid gather/scatter impossible ' // &
936	'in non parallel mode'
937	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
938	#endif
939	ENDIF
940
941	nxl_mg(i) = nxl_l
942	nxr_mg(i) = nxr_l
943	nys_mg(i) = nys_l
944	nyn_mg(i) = nyn_l
945	nzt_mg(i) = nzt_l
946
947	nxl_l = nxl_l / 2
948	nxr_l = nxr_l / 2
949	nys_l = nys_l / 2
950	nyn_l = nyn_l / 2
951	nzt_l = nzt_l / 2
952
953	ENDDO
954
955	!
956	!-- Temporary problem: Currently calculation of maxerror iin routine poismg crashes
957	!-- if grid data are collected on PE0 already on the finest grid level.
958	!-- To be solved later.
959	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
960	message_string = 'grid coarsening on subdomain level cannot be performed'
961	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
962	ENDIF
963
964	ELSE
965
966	maximum_grid_level = 0
967
968	ENDIF
969
970	!
971	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
972	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
973	!-- is required.
974	grid_level = 0
975
976	#if defined( __parallel ) && ! defined ( __check )
977	!
978	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
979	ngp_y = nyn - nys + 1 + 2 * nbgp
980
981	!
982	!-- Define new MPI derived datatypes for the exchange of ghost points in
983	!-- x- and y-direction for 2D-arrays (line)
984	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
985	ierr )
986	CALL MPI_TYPE_COMMIT( type_x, ierr )
987	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
988	type_x_int, ierr )
989	CALL MPI_TYPE_COMMIT( type_x_int, ierr )
990
991	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
992	CALL MPI_TYPE_COMMIT( type_y, ierr )
993	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int, ierr )
994	CALL MPI_TYPE_COMMIT( type_y_int, ierr )
995
996
997	!
998	!-- Calculate gridpoint numbers for the exchange of ghost points along x
999	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1000	!-- exchange of ghost points in y-direction (xz-plane).
1001	!-- Do these calculations for the model grid and (if necessary) also
1002	!-- for the coarser grid levels used in the multigrid method
1003	ALLOCATE ( ngp_xz(0:maximum_grid_level), ngp_yz(0:maximum_grid_level), &
1004	type_xz(0:maximum_grid_level), type_yz(0:maximum_grid_level) )
1005
1006	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1007
1008	!
1009	!-- Discern between the model grid, which needs nbgp ghost points and
1010	!-- grid levels for the multigrid scheme. In the latter case only one
1011	!-- ghost point is necessary.
1012	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1013	!-- grid. The following loop is needed for data exchange in poismg.f90.
1014	!
1015	!-- Determine number of grid points of yz-layer for exchange
1016	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1017
1018	!
1019	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1020	!-- Although data are contiguous in physical memory (which does not
1021	!-- necessarily require an MPI-derived datatype), the data exchange between
1022	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1023	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1024	MPI_REAL, type_xz(0), ierr )
1025	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1026
1027	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1028	ierr )
1029	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1030
1031	!
1032	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1033	IF ( psolver(1:9) == 'multigrid' ) THEN
1034	!
1035	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1036	DO i = maximum_grid_level, 1 , -1
1037
1038	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1039	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1040
1041	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1042	MPI_REAL, type_xz(i), ierr )
1043	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1044
1045	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1046	ierr )
1047	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1048
1049	nxl_l = nxl_l / 2
1050	nxr_l = nxr_l / 2
1051	nys_l = nys_l / 2
1052	nyn_l = nyn_l / 2
1053	nzt_l = nzt_l / 2
1054
1055	ENDDO
1056
1057	ENDIF
1058	!
1059	!-- Define data types for exchange of 3D Integer arrays.
1060	ngp_yz_int = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1061
1062	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int, &
1063	MPI_INTEGER, type_xz_int, ierr )
1064	CALL MPI_TYPE_COMMIT( type_xz_int, ierr )
1065
1066	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int, ngp_yz_int, MPI_INTEGER, type_yz_int, &
1067	ierr )
1068	CALL MPI_TYPE_COMMIT( type_yz_int, ierr )
1069
1070	#endif
1071
1072	#if defined( __parallel ) && ! defined ( __check )
1073	!
1074	!-- Setting of flags for inflow/outflow/nesting conditions in case of non-cyclic
1075	!-- horizontal boundary conditions.
1076	IF ( pleft == MPI_PROC_NULL ) THEN
1077	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1078	inflow_l = .TRUE.
1079	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1080	outflow_l = .TRUE.
1081	#if defined( PMC_ACTIVE )
1082	ELSEIF ( bc_lr == 'nested' ) THEN
1083	nest_bound_l = .TRUE.
1084	#endif
1085	ENDIF
1086	ENDIF
1087
1088	IF ( pright == MPI_PROC_NULL ) THEN
1089	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1090	outflow_r = .TRUE.
1091	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1092	inflow_r = .TRUE.
1093	#if defined( PMC_ACTIVE )
1094	ELSEIF ( bc_lr == 'nested' ) THEN
1095	nest_bound_r = .TRUE.
1096	#endif
1097	ENDIF
1098	ENDIF
1099
1100	IF ( psouth == MPI_PROC_NULL ) THEN
1101	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1102	outflow_s = .TRUE.
1103	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1104	inflow_s = .TRUE.
1105	#if defined( PMC_ACTIVE )
1106	ELSEIF ( bc_ns == 'nested' ) THEN
1107	nest_bound_s = .TRUE.
1108	#endif
1109	ENDIF
1110	ENDIF
1111
1112	IF ( pnorth == MPI_PROC_NULL ) THEN
1113	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1114	inflow_n = .TRUE.
1115	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1116	outflow_n = .TRUE.
1117	#if defined( PMC_ACTIVE )
1118	ELSEIF ( bc_ns == 'nested' ) THEN
1119	nest_bound_n = .TRUE.
1120	#endif
1121	ENDIF
1122	ENDIF
1123
1124	!
1125	!-- Broadcast the id of the inflow PE
1126	IF ( inflow_l ) THEN
1127	id_inflow_l = myidx
1128	ELSE
1129	id_inflow_l = 0
1130	ENDIF
1131	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1132	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1133	comm1dx, ierr )
1134
1135	!
1136	!-- Broadcast the id of the recycling plane
1137	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1138	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
1139	NINT( recycling_width / dx ) <= nxr ) THEN
1140	id_recycling_l = myidx
1141	ELSE
1142	id_recycling_l = 0
1143	ENDIF
1144	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1145	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1146	comm1dx, ierr )
1147
1148	CALL location_message( 'finished', .TRUE. )
1149
1150	#elif ! defined ( __parallel )
1151	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1152	inflow_l = .TRUE.
1153	outflow_r = .TRUE.
1154	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1155	outflow_l = .TRUE.
1156	inflow_r = .TRUE.
1157	ENDIF
1158
1159	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1160	inflow_n = .TRUE.
1161	outflow_s = .TRUE.
1162	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1163	outflow_n = .TRUE.
1164	inflow_s = .TRUE.
1165	ENDIF
1166	#endif
1167
1168	!
1169	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1170	!-- one more grid point.
1171	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) THEN
1172	nxlu = nxl + 1
1173	ELSE
1174	nxlu = nxl
1175	ENDIF
1176	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) THEN
1177	nysv = nys + 1
1178	ELSE
1179	nysv = nys
1180	ENDIF
1181
1182	!
1183	!-- Allocate wall flag arrays used in the multigrid solver
1184	IF ( psolver(1:9) == 'multigrid' ) THEN
1185
1186	DO i = maximum_grid_level, 1, -1
1187
1188	SELECT CASE ( i )
1189
1190	CASE ( 1 )
1191	ALLOCATE( wall_flags_1(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 ( 2 )
1196	ALLOCATE( wall_flags_2(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 ( 3 )
1201	ALLOCATE( wall_flags_3(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 ( 4 )
1206	ALLOCATE( wall_flags_4(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 ( 5 )
1211	ALLOCATE( wall_flags_5(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 ( 6 )
1216	ALLOCATE( wall_flags_6(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 ( 7 )
1221	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1222	nys_mg(i)-1:nyn_mg(i)+1, &
1223	nxl_mg(i)-1:nxr_mg(i)+1) )
1224
1225	CASE ( 8 )
1226	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1227	nys_mg(i)-1:nyn_mg(i)+1, &
1228	nxl_mg(i)-1:nxr_mg(i)+1) )
1229
1230	CASE ( 9 )
1231	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1232	nys_mg(i)-1:nyn_mg(i)+1, &
1233	nxl_mg(i)-1:nxr_mg(i)+1) )
1234
1235	CASE ( 10 )
1236	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1237	nys_mg(i)-1:nyn_mg(i)+1, &
1238	nxl_mg(i)-1:nxr_mg(i)+1) )
1239
1240	CASE DEFAULT
1241	message_string = 'more than 10 multigrid levels'
1242	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1243
1244	END SELECT
1245
1246	ENDDO
1247
1248	ENDIF
1249
1250	!
1251	!-- Calculate the number of groups into which parallel I/O is split.
1252	!-- The default for files which are opened by all PEs (or where each
1253	!-- PE opens his own independent file) is, that all PEs are doing input/output
1254	!-- in parallel at the same time. This might cause performance or even more
1255	!-- severe problems depending on the configuration of the underlying file
1256	!-- system.
1257	!-- First, set the default:
1258	IF ( maximum_parallel_io_streams == -1 .OR. &
1259	maximum_parallel_io_streams > numprocs ) THEN
1260	maximum_parallel_io_streams = numprocs
1261	ENDIF
1262
1263	!
1264	!-- Now calculate the number of io_blocks and the io_group to which the
1265	!-- respective PE belongs. I/O of the groups is done in serial, but in parallel
1266	!-- for all PEs belonging to the same group. A preliminary setting with myid
1267	!-- based on MPI_COMM_WORLD has been done in parin.
1268	io_blocks = numprocs / maximum_parallel_io_streams
1269	io_group = MOD( myid+1, io_blocks )
1270
1271
1272	END SUBROUTINE init_pegrid

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