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source: palm/trunk/SOURCE/init_pegrid.f90 @ 4180

Last change on this file since 4180 was 4180, checked in by scharf, 5 years ago
removed comments in 'Former revisions' section that are older than 01.01.2019
Property svn:keywords set to `Id`
File size: 49.5 KB

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1	!> @file init_pegrid.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2019 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_pegrid.f90 4180 2019-08-21 14:37:54Z scharf $
27	! bugfix: kind attribute added to nint function to allow for large integers which may appear in
28	! case of default recycling width and small grid spacings
29	!
30	! 3999 2019-05-23 16:09:37Z suehring
31	! Spend 3 ghost points also in case of pw-scheme when nesting is applied
32	!
33	! 3897 2019-04-15 11:51:14Z suehring
34	! Minor revision of multigrid check; give warning instead of an abort.
35	!
36	! 3890 2019-04-12 15:59:20Z suehring
37	! Check if grid coarsening is possible on subdomain, in order to avoid that
38	! multigrid approach effectively reduces to a Gauss-Seidel scheme.
39	!
40	! 3885 2019-04-11 11:29:34Z kanani
41	! Changes related to global restructuring of location messages and introduction
42	! of additional debug messages
43	!
44	! 3884 2019-04-10 13:31:55Z Giersch
45	! id_recycling is only calculated in case of tubulent inflow
46	!
47	! 3761 2019-02-25 15:31:42Z raasch
48	! unused variable removed
49	!
50	! 3655 2019-01-07 16:51:22Z knoop
51	! variables documented
52	!
53	!
54	! Description:
55	! ------------
56	!> Determination of the virtual processor topology (if not prescribed by the
57	!> user)and computation of the grid point number and array bounds of the local
58	!> domains.
59	!> @todo: remove MPI-data types for 2D exchange on coarse multigrid level (not
60	!> used any more)
61	!------------------------------------------------------------------------------!
62	SUBROUTINE init_pegrid
63
64
65	USE control_parameters, &
66	ONLY: bc_dirichlet_l, bc_dirichlet_n, bc_dirichlet_r, bc_dirichlet_s, &
67	bc_lr, bc_ns, bc_radiation_l, bc_radiation_n, bc_radiation_r, &
68	bc_radiation_s, coupling_mode, coupling_topology, gathered_size,&
69	grid_level, grid_level_count, maximum_grid_level, &
70	message_string, mg_switch_to_pe0_level, momentum_advec, &
71	psolver, outflow_source_plane, recycling_width, scalar_advec, &
72	subdomain_size, turbulent_inflow, turbulent_outflow, y_shift
73
74	USE grid_variables, &
75	ONLY: dx
76
77	USE indices, &
78	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
79	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
80	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
81	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
82	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
83
84	USE kinds
85
86	USE pegrid
87
88	USE pmc_interface, &
89	ONLY: nested_run
90
91	USE spectra_mod, &
92	ONLY: calculate_spectra, dt_dosp
93
94	USE synthetic_turbulence_generator_mod, &
95	ONLY: id_stg_left, id_stg_north, id_stg_right, id_stg_south, &
96	use_syn_turb_gen
97
98	USE transpose_indices, &
99	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
100	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
101
102	USE vertical_nesting_mod, &
103	ONLY: vnested, vnest_init_pegrid_domain, vnest_init_pegrid_rank
104
105	IMPLICIT NONE
106
107	INTEGER(iwp) :: i !< running index over number of processors or number of multigrid level
108	INTEGER(iwp) :: id_inflow_l !< ID indicating processors located at the left inflow boundary
109	INTEGER(iwp) :: id_outflow_l !< local value of id_outflow
110	INTEGER(iwp) :: id_outflow_source_l !< local value of id_outflow_source
111	INTEGER(iwp) :: id_recycling_l !< ID indicating processors located at the recycling plane
112	INTEGER(iwp) :: id_stg_left_l !< left lateral boundary local core id in case of turbulence generator
113	INTEGER(iwp) :: id_stg_north_l !< north lateral boundary local core id in case of turbulence generator
114	INTEGER(iwp) :: id_stg_right_l !< right lateral boundary local core id in case of turbulence generator
115	INTEGER(iwp) :: id_stg_south_l !< south lateral boundary local core id in case of turbulence generator
116	INTEGER(iwp) :: ind(5) !< array containing the subdomain bounds
117	INTEGER(iwp) :: j !< running index, used for various loops
118	INTEGER(iwp) :: k !< number of vertical grid points in different multigrid level
119	INTEGER(iwp) :: maximum_grid_level_l !< maximum number of grid level without switching to PE 0
120	INTEGER(iwp) :: mg_levels_x !< maximum number of grid level allowed along x-direction
121	INTEGER(iwp) :: mg_levels_y !< maximum number of grid level allowed along y-direction
122	INTEGER(iwp) :: mg_levels_z !< maximum number of grid level allowed along z-direction
123	INTEGER(iwp) :: mg_switch_to_pe0_level_l !< maximum number of grid level with switching to PE 0
124	INTEGER(iwp) :: nnx_y !< quotient of number of grid points along x-direction and number of PEs used along y-direction
125	INTEGER(iwp) :: nny_x !< quotient of number of grid points along y-direction and number of PEs used along x-direction
126	INTEGER(iwp) :: nny_z !< quotient of number of grid points along y-direction and number of PEs used along x-direction
127	INTEGER(iwp) :: nnz_x !< quotient of number of grid points along z-direction and number of PEs used along x-direction
128	INTEGER(iwp) :: nnz_y !< quotient of number of grid points along z-direction and number of PEs used along x-direction
129	INTEGER(iwp) :: numproc_sqr !< square root of the number of processors
130	INTEGER(iwp) :: nxl_l !< lower index bound along x-direction on subdomain and different multigrid level
131	INTEGER(iwp) :: nxr_l !< upper index bound along x-direction on subdomain and different multigrid level
132	INTEGER(iwp) :: nyn_l !< lower index bound along y-direction on subdomain and different multigrid level
133	INTEGER(iwp) :: nys_l !< upper index bound along y-direction on subdomain and different multigrid level
134	INTEGER(iwp) :: nzb_l !< lower index bound along z-direction on subdomain and different multigrid level
135	INTEGER(iwp) :: nzt_l !< upper index bound along z-direction on subdomain and different multigrid level
136	!$ INTEGER(iwp) :: omp_get_num_threads !< number of OpenMP threads
137
138	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !< dummy array containing index bounds on subdomain, used for gathering
139	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !< lower index bound allong x-direction for every PE
140	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !< upper index bound allong x-direction for every PE
141	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !< lower index bound allong y-direction for every PE
142	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !< lower index bound allong y-direction for every PE
143
144	INTEGER(iwp), DIMENSION(2) :: pdims_remote !< number of PEs used for coupled model (only in atmospher-ocean coupling)
145	INTEGER(iwp) :: lcoord(2) !< PE coordinates of left neighbor along x and y
146	INTEGER(iwp) :: rcoord(2) !< PE coordinates of right neighbor along x and y
147
148	!
149	!-- Get the number of OpenMP threads
150	!$OMP PARALLEL
151	!$ threads_per_task = omp_get_num_threads()
152	!$OMP END PARALLEL
153
154
155	#if defined( __parallel )
156
157	CALL location_message( 'creating virtual PE grids + MPI derived data types', 'start' )
158
159	!
160	!-- Determine the processor topology or check it, if prescribed by the user
161	IF ( npex == -1 .AND. npey == -1 ) THEN
162
163	!
164	!-- Automatic determination of the topology
165	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
166	pdims(1) = MAX( numproc_sqr , 1 )
167	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
168	pdims(1) = pdims(1) - 1
169	ENDDO
170	pdims(2) = numprocs / pdims(1)
171
172	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
173
174	!
175	!-- Prescribed by user. Number of processors on the prescribed topology
176	!-- must be equal to the number of PEs available to the job
177	IF ( ( npex * npey ) /= numprocs ) THEN
178	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
179	'topology (', npex*npey,') does not match & the number of ', &
180	'PEs available to the job (', numprocs, ')'
181	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
182	ENDIF
183	pdims(1) = npex
184	pdims(2) = npey
185
186	ELSE
187	!
188	!-- If the processor topology is prescribed by the user, the number of
189	!-- PEs must be given in both directions
190	message_string = 'if the processor topology is prescribed by th' // &
191	'e user & both values of "npex" and "npey" must be given' // &
192	' in the &NAMELIST-parameter file'
193	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
194
195	ENDIF
196
197	!
198	!-- If necessary, set horizontal boundary conditions to non-cyclic
199	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
200	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
201
202
203	!
204	!-- Create the virtual processor grid
205	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
206	comm2d, ierr )
207	CALL MPI_COMM_RANK( comm2d, myid, ierr )
208	WRITE (myid_char,'(''_'',I6.6)') myid
209
210	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
211	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
212	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
213	!
214	!-- In case of cyclic boundary conditions, a y-shift at the boundaries in
215	!-- x-direction can be introduced via parameter y_shift. The shift is done
216	!-- by modifying the processor grid in such a way that processors located
217	!-- at the x-boundary communicate across it to processors with y-coordinate
218	!-- shifted by y_shift relative to their own. This feature can not be used
219	!-- in combination with an fft pressure solver. It has been implemented to
220	!-- counter the effect of streak structures in case of cyclic boundary
221	!-- conditions. For a description of these see Munters
222	!-- (2016; dx.doi.org/10.1063/1.4941912)
223	!--
224	!-- Get coordinates of left and right neighbor on PE grid
225	IF ( y_shift /= 0 ) THEN
226
227	IF ( bc_lr /= 'cyclic' .OR. bc_ns /= 'cyclic' ) THEN
228	message_string = 'y_shift /= 0 is only allowed for cyclic ' // &
229	'boundary conditions in both directions '
230	CALL message( 'check_parameters', 'PA0467', 1, 2, 0, 6, 0 )
231	ENDIF
232	IF ( TRIM( psolver ) /= 'multigrid' .AND. &
233	TRIM( psolver ) /= 'multigrid_noopt') &
234	THEN
235	message_string = 'y_shift /= 0 requires a multigrid pressure solver '
236	CALL message( 'check_parameters', 'PA0468', 1, 2, 0, 6, 0 )
237	ENDIF
238
239	CALL MPI_CART_COORDS( comm2d, pright, ndim, rcoord, ierr )
240	CALL MPI_CART_COORDS( comm2d, pleft, ndim, lcoord, ierr )
241
242	!
243	!-- If the x(y)-coordinate of the right (left) neighbor is smaller (greater)
244	!-- than that of the calling process, then the calling process is located on
245	!-- the right (left) boundary of the processor grid. In that case,
246	!-- the y-coordinate of that neighbor is increased (decreased) by y_shift.
247	!-- The rank of the process with that coordinate is then inquired and the
248	!-- neighbor rank for MPI_SENDRECV, pright (pleft) is set to it.
249	!-- In this way, the calling process receives a new right (left) neighbor
250	!-- for all future MPI_SENDRECV calls. That neighbor has a y-coordinate
251	!-- of y+(-)y_shift, where y is the original right (left) neighbor's
252	!-- y-coordinate. The modulo-operation ensures that if the neighbor's
253	!-- y-coordinate exceeds the grid-boundary, it will be relocated to
254	!-- the opposite part of the grid cyclicly.
255	IF ( rcoord(1) < pcoord(1) ) THEN
256	rcoord(2) = MODULO( rcoord(2) + y_shift, pdims(2) )
257	CALL MPI_CART_RANK( comm2d, rcoord, pright, ierr )
258	ENDIF
259
260	IF ( lcoord(1) > pcoord(1) ) THEN
261	lcoord(2) = MODULO( lcoord(2) - y_shift, pdims(2) )
262	CALL MPI_CART_RANK( comm2d, lcoord, pleft, ierr )
263	ENDIF
264	ENDIF
265	!
266	!-- Vertical nesting: store four lists that identify partner ranks to exchange
267	!-- data
268	IF ( vnested ) CALL vnest_init_pegrid_rank
269
270	!
271	!-- Determine sub-topologies for transpositions
272	!-- Transposition from z to x:
273	remain_dims(1) = .TRUE.
274	remain_dims(2) = .FALSE.
275	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
276	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
277	!
278	!-- Transposition from x to y
279	remain_dims(1) = .FALSE.
280	remain_dims(2) = .TRUE.
281	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
282	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
283
284
285	!
286	!-- Calculate array bounds along x-direction for every PE.
287	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
288	nysf(0:pdims(2)-1) )
289
290	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
291	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ', &
292	'is not an& integral divisor of the number ', &
293	'of processors (', pdims(1),')'
294	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
295	ELSE
296	nnx = ( nx + 1 ) / pdims(1)
297	ENDIF
298
299	!
300	!-- Left and right array bounds, number of gridpoints
301	DO i = 0, pdims(1)-1
302	nxlf(i) = i * nnx
303	nxrf(i) = ( i + 1 ) * nnx - 1
304	ENDDO
305
306	!
307	!-- Calculate array bounds in y-direction for every PE.
308	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
309	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
310	'is not an& integral divisor of the number of', &
311	'processors (', pdims(2),')'
312	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
313	ELSE
314	nny = ( ny + 1 ) / pdims(2)
315	ENDIF
316
317	!
318	!-- South and north array bounds
319	DO j = 0, pdims(2)-1
320	nysf(j) = j * nny
321	nynf(j) = ( j + 1 ) * nny - 1
322	ENDDO
323
324	!
325	!-- Local array bounds of the respective PEs
326	nxl = nxlf(pcoord(1))
327	nxr = nxrf(pcoord(1))
328	nys = nysf(pcoord(2))
329	nyn = nynf(pcoord(2))
330	nzb = 0
331	nzt = nz
332	nnz = nz
333
334	!
335	!-- Set switches to define if the PE is situated at the border of the virtual
336	!-- processor grid
337	IF ( nxl == 0 ) left_border_pe = .TRUE.
338	IF ( nxr == nx ) right_border_pe = .TRUE.
339	IF ( nys == 0 ) south_border_pe = .TRUE.
340	IF ( nyn == ny ) north_border_pe = .TRUE.
341
342	!
343	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
344	!-- (needed in the pressure solver)
345	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
346	!-- boundaries are omitted, because they are obstructive to the transposition
347
348	!
349	!-- 1. transposition z --> x
350	!-- This transposition is not neccessary in case of a 1d-decomposition along x
351	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
352
353	IF ( pdims(2) /= 1 ) THEN
354	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
355	WRITE( message_string, * ) 'transposition z --> x:', &
356	'& nz=',nz,' is not an integral divisior of pdims(1)=', &
357	pdims(1)
358	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
359	ENDIF
360	ENDIF
361
362	nys_x = nys
363	nyn_x = nyn
364	nny_x = nny
365	nnz_x = nz / pdims(1)
366	nzb_x = 1 + myidx * nnz_x
367	nzt_x = ( myidx + 1 ) * nnz_x
368	sendrecvcount_zx = nnx * nny * nnz_x
369
370	ENDIF
371
372
373	IF ( psolver == 'poisfft' ) THEN
374	!
375	!-- 2. transposition x --> y
376	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
377	WRITE( message_string, * ) 'transposition x --> y:', &
378	'& nx+1=',nx+1,' is not an integral divisor of ', &
379	'pdims(2)=',pdims(2)
380	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
381	ENDIF
382
383	nnz_y = nnz_x
384	nzb_y = nzb_x
385	nzt_y = nzt_x
386	nnx_y = (nx+1) / pdims(2)
387	nxl_y = myidy * nnx_y
388	nxr_y = ( myidy + 1 ) * nnx_y - 1
389	sendrecvcount_xy = nnx_y * nny_x * nnz_y
390	!
391	!-- 3. transposition y --> z
392	!-- (ELSE: x --> y in case of 1D-decomposition along x)
393	nxl_z = nxl_y
394	nxr_z = nxr_y
395	nny_z = (ny+1) / pdims(1)
396	nys_z = myidx * nny_z
397	nyn_z = ( myidx + 1 ) * nny_z - 1
398	sendrecvcount_yz = nnx_y * nny_z * nnz_y
399
400	IF ( pdims(2) /= 1 ) THEN
401	!
402	!-- y --> z
403	!-- This transposition is not neccessary in case of a 1d-decomposition
404	!-- along x, except that the uptream-spline method is switched on
405	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
406	WRITE( message_string, * ) 'transposition y --> z:', &
407	'& ny+1=',ny+1,' is not an integral divisor of',&
408	' pdims(1)=',pdims(1)
409	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
410	ENDIF
411
412	ELSE
413	!
414	!-- x --> y
415	!-- This condition must be fulfilled for a 1D-decomposition along x
416	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
417	WRITE( message_string, * ) 'transposition x --> y:', &
418	'& ny+1=',ny+1,' is not an integral divisor of',&
419	' pdims(1)=',pdims(1)
420	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
421	ENDIF
422
423	ENDIF
424
425	ENDIF
426
427	!
428	!-- Indices for direct transpositions z --> y (used for calculating spectra)
429	IF ( calculate_spectra ) THEN
430	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
431	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
432	'for spectra): nz=',nz,' is not an integral divisor of ', &
433	'pdims(2)=',pdims(2)
434	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
435	ELSE
436	nxl_yd = nxl
437	nxr_yd = nxr
438	nzb_yd = 1 + myidy * ( nz / pdims(2) )
439	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
440	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
441	ENDIF
442	ENDIF
443
444	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
445	!
446	!-- Indices for direct transpositions y --> x
447	!-- (they are only possible in case of a 1d-decomposition along x)
448	IF ( pdims(2) == 1 ) THEN
449	nny_x = nny / pdims(1)
450	nys_x = myid * nny_x
451	nyn_x = ( myid + 1 ) * nny_x - 1
452	nzb_x = 1
453	nzt_x = nz
454	sendrecvcount_xy = nnx * nny_x * nz
455	ENDIF
456
457	ENDIF
458
459	IF ( psolver == 'poisfft' ) THEN
460	!
461	!-- Indices for direct transpositions x --> y
462	!-- (they are only possible in case of a 1d-decomposition along y)
463	IF ( pdims(1) == 1 ) THEN
464	nnx_y = nnx / pdims(2)
465	nxl_y = myid * nnx_y
466	nxr_y = ( myid + 1 ) * nnx_y - 1
467	nzb_y = 1
468	nzt_y = nz
469	sendrecvcount_xy = nnx_y * nny * nz
470	ENDIF
471
472	ENDIF
473
474	!
475	!-- Arrays for storing the array bounds are needed any more
476	DEALLOCATE( nxlf , nxrf , nynf , nysf )
477
478
479	!
480	!-- Collect index bounds from other PEs (to be written to restart file later)
481	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
482
483	IF ( myid == 0 ) THEN
484
485	hor_index_bounds(1,0) = nxl
486	hor_index_bounds(2,0) = nxr
487	hor_index_bounds(3,0) = nys
488	hor_index_bounds(4,0) = nyn
489
490	!
491	!-- Receive data from all other PEs
492	DO i = 1, numprocs-1
493	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
494	ierr )
495	hor_index_bounds(:,i) = ibuf(1:4)
496	ENDDO
497
498	ELSE
499	!
500	!-- Send index bounds to PE0
501	ibuf(1) = nxl
502	ibuf(2) = nxr
503	ibuf(3) = nys
504	ibuf(4) = nyn
505	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
506
507	ENDIF
508
509
510	#if defined( __print )
511	!
512	!-- Control output
513	IF ( myid == 0 ) THEN
514	PRINT, ' processor topology *'
515	PRINT*, ' '
516	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
517	&' nys: nyn'
518	PRINT*, '------------------------------------------------------------',&
519	&'-----------'
520	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
521	myidx, myidy, nxl, nxr, nys, nyn
522	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
523	2(2X,I4,':',I4))
524
525	!
526	!-- Receive data from the other PEs
527	DO i = 1,numprocs-1
528	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
529	ierr )
530	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
531	ENDDO
532	ELSE
533
534	!
535	!-- Send data to PE0
536	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
537	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
538	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
539	ibuf(12) = nyn
540	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
541	ENDIF
542	#endif
543
544	!
545	!-- Determine the number of ghost point layers
546	IF ( scalar_advec == 'ws-scheme' .OR. &
547	momentum_advec == 'ws-scheme' .OR. nested_run ) THEN
548	nbgp = 3
549	ELSE
550	nbgp = 1
551	ENDIF
552
553	!
554	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
555	!-- which is needed for coupled atmosphere-ocean runs.
556	!-- First, calculate number of grid points of an xy-plane.
557	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
558	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
559	CALL MPI_TYPE_COMMIT( type_xy, ierr )
560
561	IF ( TRIM( coupling_mode ) /= 'uncoupled' .AND. .NOT. vnested ) THEN
562
563	!
564	!-- Pass the number of grid points of the atmosphere model to
565	!-- the ocean model and vice versa
566	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
567
568	nx_a = nx
569	ny_a = ny
570
571	IF ( myid == 0 ) THEN
572
573	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
574	ierr )
575	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
576	ierr )
577	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
578	ierr )
579	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
580	status, ierr )
581	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
582	status, ierr )
583	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
584	comm_inter, status, ierr )
585	ENDIF
586
587	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
588	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
589	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
590
591	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
592
593	nx_o = nx
594	ny_o = ny
595
596	IF ( myid == 0 ) THEN
597
598	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
599	ierr )
600	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
601	ierr )
602	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
603	status, ierr )
604	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
605	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
606	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
607	ENDIF
608
609	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
610	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
611	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
612
613	ENDIF
614
615	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
616	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
617
618	!
619	!-- Determine if the horizontal grid and the number of PEs in ocean and
620	!-- atmosphere is same or not
621	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
622	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
623	THEN
624	coupling_topology = 0
625	ELSE
626	coupling_topology = 1
627	ENDIF
628
629	!
630	!-- Determine the target PEs for the exchange between ocean and
631	!-- atmosphere (comm2d)
632	IF ( coupling_topology == 0 ) THEN
633	!
634	!-- In case of identical topologies, every atmosphere PE has exactly one
635	!-- ocean PE counterpart and vice versa
636	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
637	target_id = myid + numprocs
638	ELSE
639	target_id = myid
640	ENDIF
641
642	ELSE
643	!
644	!-- In case of nonequivalent topology in ocean and atmosphere only for
645	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
646	!-- data echxchange between ocean and atmosphere will be done only
647	!-- between these PEs.
648	IF ( myid == 0 ) THEN
649
650	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
651	target_id = numprocs
652	ELSE
653	target_id = 0
654	ENDIF
655
656	ENDIF
657
658	ENDIF
659
660	ENDIF
661
662	!
663	!-- Store partner grid point co-ordinates as lists.
664	!-- Create custom MPI vector datatypes for contiguous data transfer
665	IF ( vnested ) CALL vnest_init_pegrid_domain
666
667	#else
668
669	!
670	!-- Array bounds when running on a single PE (respectively a non-parallel
671	!-- machine)
672	nxl = 0
673	nxr = nx
674	nnx = nxr - nxl + 1
675	nys = 0
676	nyn = ny
677	nny = nyn - nys + 1
678	nzb = 0
679	nzt = nz
680	nnz = nz
681
682	ALLOCATE( hor_index_bounds(4,0:0) )
683	hor_index_bounds(1,0) = nxl
684	hor_index_bounds(2,0) = nxr
685	hor_index_bounds(3,0) = nys
686	hor_index_bounds(4,0) = nyn
687
688	!
689	!-- Array bounds for the pressure solver (in the parallel code, these bounds
690	!-- are the ones for the transposed arrays)
691	nys_x = nys
692	nyn_x = nyn
693	nzb_x = nzb + 1
694	nzt_x = nzt
695
696	nxl_y = nxl
697	nxr_y = nxr
698	nzb_y = nzb + 1
699	nzt_y = nzt
700
701	nxl_z = nxl
702	nxr_z = nxr
703	nys_z = nys
704	nyn_z = nyn
705
706	#endif
707
708	!
709	!-- Calculate number of grid levels necessary for the multigrid poisson solver
710	!-- as well as the gridpoint indices on each level
711	IF ( psolver(1:9) == 'multigrid' ) THEN
712
713	!
714	!-- First calculate number of possible grid levels for the subdomains
715	mg_levels_x = 1
716	mg_levels_y = 1
717	mg_levels_z = 1
718
719	i = nnx
720	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
721	i = i / 2
722	mg_levels_x = mg_levels_x + 1
723	ENDDO
724
725	j = nny
726	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
727	j = j / 2
728	mg_levels_y = mg_levels_y + 1
729	ENDDO
730
731	k = nz ! do not use nnz because it might be > nz due to transposition
732	! requirements
733	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
734	k = k / 2
735	mg_levels_z = mg_levels_z + 1
736	ENDDO
737	!
738	!-- The optimized MG-solver does not allow odd values for nz at the coarsest
739	!-- grid level
740	IF ( TRIM( psolver ) /= 'multigrid_noopt' ) THEN
741	IF ( MOD( k, 2 ) /= 0 ) mg_levels_z = mg_levels_z - 1
742	!
743	!-- An odd value of nz does not work. The finest level must have an even
744	!-- value.
745	IF ( mg_levels_z == 0 ) THEN
746	message_string = 'optimized multigrid method requires nz to be even'
747	CALL message( 'init_pegrid', 'PA0495', 1, 2, 0, 6, 0 )
748	ENDIF
749	ENDIF
750
751	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
752	!
753	!-- Check if subdomain sizes prevents any coarsening.
754	!-- This case, the maximum number of grid levels is 1, i.e. effectively
755	!-- a Gauss-Seidel scheme is applied rather than a multigrid approach.
756	!-- Give a warning in this case.
757	IF ( maximum_grid_level == 1 .AND. mg_switch_to_pe0_level == -1 ) THEN
758	message_string = 'No grid coarsening possible, multigrid ' // &
759	'approach effectively reduces to a Gauss-Seidel ' //&
760	'scheme.'
761
762	CALL message( 'poismg', 'PA0648', 0, 1, 0, 6, 0 )
763	ENDIF
764
765	!
766	!-- Find out, if the total domain allows more levels. These additional
767	!-- levels are identically processed on all PEs.
768	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
769
770	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
771
772	mg_switch_to_pe0_level_l = maximum_grid_level
773
774	mg_levels_x = 1
775	mg_levels_y = 1
776
777	i = nx+1
778	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
779	i = i / 2
780	mg_levels_x = mg_levels_x + 1
781	ENDDO
782
783	j = ny+1
784	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
785	j = j / 2
786	mg_levels_y = mg_levels_y + 1
787	ENDDO
788
789	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
790
791	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
792	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
793	mg_switch_to_pe0_level_l + 1
794	ELSE
795	mg_switch_to_pe0_level_l = 0
796	ENDIF
797
798	ELSE
799
800	mg_switch_to_pe0_level_l = 0
801	maximum_grid_level_l = maximum_grid_level
802
803	ENDIF
804
805	!
806	!-- Use switch level calculated above only if it is not pre-defined
807	!-- by user
808	IF ( mg_switch_to_pe0_level == 0 ) THEN
809	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
810	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
811	maximum_grid_level = maximum_grid_level_l
812	ENDIF
813
814	ELSE
815	!
816	!-- Check pre-defined value and reset to default, if neccessary
817	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
818	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
819	message_string = 'mg_switch_to_pe0_level ' // &
820	'out of range and reset to 0'
821	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
822	mg_switch_to_pe0_level = 0
823	ELSE
824	!
825	!-- Use the largest number of possible levels anyway and recalculate
826	!-- the switch level to this largest number of possible values
827	maximum_grid_level = maximum_grid_level_l
828
829	ENDIF
830
831	ENDIF
832
833	ENDIF
834
835	ALLOCATE( grid_level_count(maximum_grid_level), &
836	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
837	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
838	nzt_mg(0:maximum_grid_level) )
839
840	grid_level_count = 0
841	!
842	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
843	!-- recursive subroutine next_mg_level
844	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
845
846	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
847
848	DO i = maximum_grid_level, 1 , -1
849
850	IF ( i == mg_switch_to_pe0_level ) THEN
851	#if defined( __parallel )
852	!
853	!-- Save the grid size of the subdomain at the switch level, because
854	!-- it is needed in poismg.
855	ind(1) = nxl_l; ind(2) = nxr_l
856	ind(3) = nys_l; ind(4) = nyn_l
857	ind(5) = nzt_l
858	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
859	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
860	MPI_INTEGER, comm2d, ierr )
861	DO j = 0, numprocs-1
862	DO k = 1, 5
863	mg_loc_ind(k,j) = ind_all(k+j*5)
864	ENDDO
865	ENDDO
866	DEALLOCATE( ind_all )
867	!
868	!-- Calculate the grid size of the total domain
869	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
870	nxl_l = 0
871	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
872	nys_l = 0
873	!
874	!-- The size of this gathered array must not be larger than the
875	!-- array tend, which is used in the multigrid scheme as a temporary
876	!-- array. Therefore the subdomain size of an PE is calculated and
877	!-- the size of the gathered grid. These values are used in
878	!-- routines pres and poismg
879	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
880	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
881	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
882	( nzt_l - nzb + 2 )
883
884	#else
885	message_string = 'multigrid gather/scatter impossible ' // &
886	'in non parallel mode'
887	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
888	#endif
889	ENDIF
890
891	nxl_mg(i) = nxl_l
892	nxr_mg(i) = nxr_l
893	nys_mg(i) = nys_l
894	nyn_mg(i) = nyn_l
895	nzt_mg(i) = nzt_l
896
897	nxl_l = nxl_l / 2
898	nxr_l = nxr_l / 2
899	nys_l = nys_l / 2
900	nyn_l = nyn_l / 2
901	nzt_l = nzt_l / 2
902
903	ENDDO
904
905	!
906	!-- Temporary problem: Currently calculation of maxerror in routine poismg crashes
907	!-- if grid data are collected on PE0 already on the finest grid level.
908	!-- To be solved later.
909	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
910	message_string = 'grid coarsening on subdomain level cannot be performed'
911	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
912	ENDIF
913
914	ELSE
915
916	maximum_grid_level = 0
917
918	ENDIF
919
920	!
921	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
922	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
923	!-- is required.
924	grid_level = 0
925
926	#if defined( __parallel )
927	!
928	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
929	ngp_y = nyn - nys + 1 + 2 * nbgp
930
931	!
932	!-- Define new MPI derived datatypes for the exchange of ghost points in
933	!-- x- and y-direction for 2D-arrays (line)
934	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
935	ierr )
936	CALL MPI_TYPE_COMMIT( type_x, ierr )
937
938	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
939	CALL MPI_TYPE_COMMIT( type_y, ierr )
940	!
941	!-- Define new MPI derived datatypes for the exchange of ghost points in
942	!-- x- and y-direction for 2D-INTEGER arrays (line) - on normal grid.
943	!-- Define types for 32-bit and 8-bit Integer. The 8-bit Integer are only
944	!-- required on normal grid, while 32-bit Integer may be also required on
945	!-- coarser grid level in case of multigrid solver.
946	!
947	!-- 8-bit Integer
948	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_BYTE, &
949	type_x_byte, ierr )
950	CALL MPI_TYPE_COMMIT( type_x_byte, ierr )
951
952	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_BYTE, &
953	type_y_byte, ierr )
954	CALL MPI_TYPE_COMMIT( type_y_byte, ierr )
955	!
956	!-- 32-bit Integer
957	ALLOCATE( type_x_int(0:maximum_grid_level), &
958	type_y_int(0:maximum_grid_level) )
959
960	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
961	type_x_int(0), ierr )
962	CALL MPI_TYPE_COMMIT( type_x_int(0), ierr )
963
964	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int(0), ierr )
965	CALL MPI_TYPE_COMMIT( type_y_int(0), ierr )
966	!
967	!-- Calculate gridpoint numbers for the exchange of ghost points along x
968	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
969	!-- exchange of ghost points in y-direction (xz-plane).
970	!-- Do these calculations for the model grid and (if necessary) also
971	!-- for the coarser grid levels used in the multigrid method
972	ALLOCATE ( ngp_xz(0:maximum_grid_level), &
973	ngp_xz_int(0:maximum_grid_level), &
974	ngp_yz(0:maximum_grid_level), &
975	ngp_yz_int(0:maximum_grid_level), &
976	type_xz(0:maximum_grid_level), &
977	type_xz_int(0:maximum_grid_level), &
978	type_yz(0:maximum_grid_level), &
979	type_yz_int(0:maximum_grid_level) )
980
981	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
982
983	!
984	!-- Discern between the model grid, which needs nbgp ghost points and
985	!-- grid levels for the multigrid scheme. In the latter case only one
986	!-- ghost point is necessary.
987	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
988	!-- grid. The following loop is needed for data exchange in poismg.f90.
989	!
990	!-- Determine number of grid points of yz-layer for exchange
991	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
992
993	!
994	!-- Define an MPI-datatype for the exchange of left/right boundaries.
995	!-- Although data are contiguous in physical memory (which does not
996	!-- necessarily require an MPI-derived datatype), the data exchange between
997	!-- left and right PE's using the MPI-derived type is 10% faster than without.
998	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
999	MPI_REAL, type_xz(0), ierr )
1000	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1001
1002	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1003	ierr )
1004	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1005
1006	!
1007	!-- Define data types for exchange of 3D Integer arrays.
1008	ngp_yz_int(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1009
1010	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int(0), &
1011	MPI_INTEGER, type_xz_int(0), ierr )
1012	CALL MPI_TYPE_COMMIT( type_xz_int(0), ierr )
1013
1014	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int(0), ngp_yz_int(0), MPI_INTEGER, &
1015	type_yz_int(0), ierr )
1016	CALL MPI_TYPE_COMMIT( type_yz_int(0), ierr )
1017
1018	!
1019	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1020	IF ( psolver(1:9) == 'multigrid' ) THEN
1021	!
1022	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1023	DO i = maximum_grid_level, 1 , -1
1024	!
1025	!-- For 3D-exchange on different multigrid level, one ghost point for
1026	!-- REAL arrays, two ghost points for INTEGER arrays
1027	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1028	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1029
1030	ngp_xz_int(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1031	ngp_yz_int(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1032	!
1033	!-- MPI data type for REAL arrays, for xz-layers
1034	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1035	MPI_REAL, type_xz(i), ierr )
1036	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1037
1038	!
1039	!-- MPI data type for INTEGER arrays, for xz-layers
1040	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz_int(i), &
1041	MPI_INTEGER, type_xz_int(i), ierr )
1042	CALL MPI_TYPE_COMMIT( type_xz_int(i), ierr )
1043
1044	!
1045	!-- MPI data type for REAL arrays, for yz-layers
1046	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1047	ierr )
1048	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1049	!
1050	!-- MPI data type for INTEGER arrays, for yz-layers
1051	CALL MPI_TYPE_VECTOR( 1, ngp_yz_int(i), ngp_yz_int(i), MPI_INTEGER, &
1052	type_yz_int(i), ierr )
1053	CALL MPI_TYPE_COMMIT( type_yz_int(i), ierr )
1054
1055
1056	!-- For 2D-exchange of INTEGER arrays on coarser grid level, where 2 ghost
1057	!-- points need to be exchanged. Only required for 32-bit Integer arrays.
1058	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+5, 2, nyn_l-nys_l+5, MPI_INTEGER, &
1059	type_x_int(i), ierr )
1060	CALL MPI_TYPE_COMMIT( type_x_int(i), ierr )
1061
1062
1063	CALL MPI_TYPE_VECTOR( 2, nyn_l-nys_l+5, nyn_l-nys_l+5, MPI_INTEGER, &
1064	type_y_int(i), ierr )
1065	CALL MPI_TYPE_COMMIT( type_y_int(i), ierr )
1066
1067	nxl_l = nxl_l / 2
1068	nxr_l = nxr_l / 2
1069	nys_l = nys_l / 2
1070	nyn_l = nyn_l / 2
1071	nzt_l = nzt_l / 2
1072
1073	ENDDO
1074
1075	ENDIF
1076
1077	#endif
1078
1079	#if defined( __parallel )
1080	!
1081	!-- Setting of flags for inflow/outflow/nesting conditions.
1082	IF ( pleft == MPI_PROC_NULL ) THEN
1083	IF ( bc_lr == 'dirichlet/radiation' .OR. bc_lr == 'nested' .OR. &
1084	bc_lr == 'nesting_offline' ) THEN
1085	bc_dirichlet_l = .TRUE.
1086	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1087	bc_radiation_l = .TRUE.
1088	ENDIF
1089	ENDIF
1090
1091	IF ( pright == MPI_PROC_NULL ) THEN
1092	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1093	bc_radiation_r = .TRUE.
1094	ELSEIF ( bc_lr == 'radiation/dirichlet' .OR. bc_lr == 'nested' .OR. &
1095	bc_lr == 'nesting_offline' ) THEN
1096	bc_dirichlet_r = .TRUE.
1097	ENDIF
1098	ENDIF
1099
1100	IF ( psouth == MPI_PROC_NULL ) THEN
1101	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1102	bc_radiation_s = .TRUE.
1103	ELSEIF ( bc_ns == 'radiation/dirichlet' .OR. bc_ns == 'nested' .OR. &
1104	bc_ns == 'nesting_offline' ) THEN
1105	bc_dirichlet_s = .TRUE.
1106	ENDIF
1107	ENDIF
1108
1109	IF ( pnorth == MPI_PROC_NULL ) THEN
1110	IF ( bc_ns == 'dirichlet/radiation' .OR. bc_ns == 'nested' .OR. &
1111	bc_ns == 'nesting_offline' ) THEN
1112	bc_dirichlet_n = .TRUE.
1113	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1114	bc_radiation_n = .TRUE.
1115	ENDIF
1116	ENDIF
1117	!
1118	!-- In case of synthetic turbulence geneartor determine ids.
1119	!-- Please note, if no forcing or nesting is applied, the generator is applied
1120	!-- only at the left lateral boundary.
1121	IF ( use_syn_turb_gen ) THEN
1122	IF ( bc_dirichlet_l ) THEN
1123	id_stg_left_l = myidx
1124	ELSE
1125	id_stg_left_l = 0
1126	ENDIF
1127	IF ( bc_dirichlet_r ) THEN
1128	id_stg_right_l = myidx
1129	ELSE
1130	id_stg_right_l = 0
1131	ENDIF
1132	IF ( bc_dirichlet_s ) THEN
1133	id_stg_south_l = myidy
1134	ELSE
1135	id_stg_south_l = 0
1136	ENDIF
1137	IF ( bc_dirichlet_n ) THEN
1138	id_stg_north_l = myidy
1139	ELSE
1140	id_stg_north_l = 0
1141	ENDIF
1142
1143	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1144	CALL MPI_ALLREDUCE( id_stg_left_l, id_stg_left, 1, MPI_INTEGER, &
1145	MPI_SUM, comm1dx, ierr )
1146
1147	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1148	CALL MPI_ALLREDUCE( id_stg_right_l, id_stg_right, 1, MPI_INTEGER, &
1149	MPI_SUM, comm1dx, ierr )
1150
1151	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1152	CALL MPI_ALLREDUCE( id_stg_south_l, id_stg_south, 1, MPI_INTEGER, &
1153	MPI_SUM, comm1dy, ierr )
1154
1155	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1156	CALL MPI_ALLREDUCE( id_stg_north_l, id_stg_north, 1, MPI_INTEGER, &
1157	MPI_SUM, comm1dy, ierr )
1158
1159	ENDIF
1160
1161	!
1162	!-- Broadcast the id of the inflow PE
1163	IF ( bc_dirichlet_l ) THEN
1164	id_inflow_l = myidx
1165	ELSE
1166	id_inflow_l = 0
1167	ENDIF
1168	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1169	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1170	comm1dx, ierr )
1171
1172	!
1173	!-- Broadcast the id of the recycling plane
1174	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1175	IF ( turbulent_inflow ) THEN
1176
1177	IF ( NINT( recycling_width / dx, KIND=idp ) >= nxl .AND. &
1178	NINT( recycling_width / dx, KIND=idp ) <= nxr ) THEN
1179	id_recycling_l = myidx
1180	ELSE
1181	id_recycling_l = 0
1182	ENDIF
1183	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1184	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1185	comm1dx, ierr )
1186
1187	ENDIF
1188
1189	!
1190	!-- Broadcast the id of the outflow PE and outflow-source plane
1191	IF ( turbulent_outflow ) THEN
1192
1193	IF ( bc_radiation_r ) THEN
1194	id_outflow_l = myidx
1195	ELSE
1196	id_outflow_l = 0
1197	ENDIF
1198	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1199	CALL MPI_ALLREDUCE( id_outflow_l, id_outflow, 1, MPI_INTEGER, MPI_SUM, &
1200	comm1dx, ierr )
1201
1202	IF ( NINT( outflow_source_plane / dx ) >= nxl .AND. &
1203	NINT( outflow_source_plane / dx ) <= nxr ) THEN
1204	id_outflow_source_l = myidx
1205	ELSE
1206	id_outflow_source_l = 0
1207	ENDIF
1208	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1209	CALL MPI_ALLREDUCE( id_outflow_source_l, id_outflow_source, 1, &
1210	MPI_INTEGER, MPI_SUM, comm1dx, ierr )
1211
1212	ENDIF
1213
1214	CALL location_message( 'creating virtual PE grids + MPI derived data types', 'finished' )
1215
1216	#else
1217	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1218	bc_dirichlet_l = .TRUE.
1219	bc_radiation_r = .TRUE.
1220	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1221	bc_radiation_l = .TRUE.
1222	bc_dirichlet_r = .TRUE.
1223	ENDIF
1224
1225	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1226	bc_dirichlet_n = .TRUE.
1227	bc_radiation_s = .TRUE.
1228	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1229	bc_radiation_n = .TRUE.
1230	bc_dirichlet_s = .TRUE.
1231	ENDIF
1232	#endif
1233
1234	!
1235	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1236	!-- one more grid point.
1237	IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN
1238	nxlu = nxl + 1
1239	ELSE
1240	nxlu = nxl
1241	ENDIF
1242	IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN
1243	nysv = nys + 1
1244	ELSE
1245	nysv = nys
1246	ENDIF
1247
1248	!
1249	!-- Allocate wall flag arrays used in the multigrid solver
1250	IF ( psolver(1:9) == 'multigrid' ) THEN
1251
1252	DO i = maximum_grid_level, 1, -1
1253
1254	SELECT CASE ( i )
1255
1256	CASE ( 1 )
1257	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1258	nys_mg(i)-1:nyn_mg(i)+1, &
1259	nxl_mg(i)-1:nxr_mg(i)+1) )
1260
1261	CASE ( 2 )
1262	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1263	nys_mg(i)-1:nyn_mg(i)+1, &
1264	nxl_mg(i)-1:nxr_mg(i)+1) )
1265
1266	CASE ( 3 )
1267	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1268	nys_mg(i)-1:nyn_mg(i)+1, &
1269	nxl_mg(i)-1:nxr_mg(i)+1) )
1270
1271	CASE ( 4 )
1272	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1273	nys_mg(i)-1:nyn_mg(i)+1, &
1274	nxl_mg(i)-1:nxr_mg(i)+1) )
1275
1276	CASE ( 5 )
1277	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1278	nys_mg(i)-1:nyn_mg(i)+1, &
1279	nxl_mg(i)-1:nxr_mg(i)+1) )
1280
1281	CASE ( 6 )
1282	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1283	nys_mg(i)-1:nyn_mg(i)+1, &
1284	nxl_mg(i)-1:nxr_mg(i)+1) )
1285
1286	CASE ( 7 )
1287	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1288	nys_mg(i)-1:nyn_mg(i)+1, &
1289	nxl_mg(i)-1:nxr_mg(i)+1) )
1290
1291	CASE ( 8 )
1292	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1293	nys_mg(i)-1:nyn_mg(i)+1, &
1294	nxl_mg(i)-1:nxr_mg(i)+1) )
1295
1296	CASE ( 9 )
1297	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1298	nys_mg(i)-1:nyn_mg(i)+1, &
1299	nxl_mg(i)-1:nxr_mg(i)+1) )
1300
1301	CASE ( 10 )
1302	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1303	nys_mg(i)-1:nyn_mg(i)+1, &
1304	nxl_mg(i)-1:nxr_mg(i)+1) )
1305
1306	CASE DEFAULT
1307	message_string = 'more than 10 multigrid levels'
1308	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1309
1310	END SELECT
1311
1312	ENDDO
1313
1314	ENDIF
1315
1316	END SUBROUTINE init_pegrid

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