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source: palm/trunk/SOURCE/init_pegrid.f90 @ 4454

Last change on this file since 4454 was 4444, checked in by raasch, 5 years ago
bugfix: cpp-directives for serial mode added
Property svn:keywords set to `Id`
File size: 51.6 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 1997-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: init_pegrid.f90 4444 2020-03-05 15:59:50Z forkel $
27	! bugfix: cpp-directives for serial mode added
28	!
29	! 4360 2020-01-07 11:25:50Z suehring
30	! changed message PA0467
31	!
32	! 4264 2019-10-15 16:00:23Z scharf
33	! corrected error message string
34	!
35	! 4241 2019-09-27 06:32:47Z raasch
36	! Check added to ensure that subdomain grid has at least the size as given by the number
37	! of ghost points
38	!
39	! 4182 2019-08-22 15:20:23Z scharf
40	! Corrected "Former revisions" section
41	!
42	! 4045 2019-06-21 10:58:47Z raasch
43	! bugfix: kind attribute added to nint function to allow for large integers which may appear in
44	! case of default recycling width and small grid spacings
45	!
46	! 3999 2019-05-23 16:09:37Z suehring
47	! Spend 3 ghost points also in case of pw-scheme when nesting is applied
48	!
49	! 3897 2019-04-15 11:51:14Z suehring
50	! Minor revision of multigrid check; give warning instead of an abort.
51	!
52	! 3890 2019-04-12 15:59:20Z suehring
53	! Check if grid coarsening is possible on subdomain, in order to avoid that
54	! multigrid approach effectively reduces to a Gauss-Seidel scheme.
55	!
56	! 3885 2019-04-11 11:29:34Z kanani
57	! Changes related to global restructuring of location messages and introduction
58	! of additional debug messages
59	!
60	! 3884 2019-04-10 13:31:55Z Giersch
61	! id_recycling is only calculated in case of tubulent inflow
62	!
63	! 3761 2019-02-25 15:31:42Z raasch
64	! unused variable removed
65	!
66	! 3655 2019-01-07 16:51:22Z knoop
67	! variables documented
68	!
69	! Revision 1.1 1997/07/24 11:15:09 raasch
70	! Initial revision
71	!
72	!
73	! Description:
74	! ------------
75	!> Determination of the virtual processor topology (if not prescribed by the
76	!> user)and computation of the grid point number and array bounds of the local
77	!> domains.
78	!> @todo: remove MPI-data types for 2D exchange on coarse multigrid level (not
79	!> used any more)
80	!------------------------------------------------------------------------------!
81	SUBROUTINE init_pegrid
82
83
84	USE control_parameters, &
85	ONLY: bc_dirichlet_l, bc_dirichlet_n, bc_dirichlet_r, bc_dirichlet_s, &
86	bc_lr, bc_ns, bc_radiation_l, bc_radiation_n, bc_radiation_r, &
87	bc_radiation_s, &
88	grid_level, grid_level_count, maximum_grid_level, &
89	message_string, mg_switch_to_pe0_level, &
90	psolver
91
92
93	#if defined( __parallel )
94	USE control_parameters, &
95	ONLY: coupling_mode, coupling_topology, gathered_size, momentum_advec, &
96	outflow_source_plane, recycling_width, scalar_advec, subdomain_size, &
97	turbulent_inflow, turbulent_outflow, y_shift
98
99	USE grid_variables, &
100	ONLY: dx
101	#endif
102
103	USE indices, &
104	ONLY: nnx, nny, nnz, nx, nxl, nxl_mg, &
105	nxlu, nxr, nxr_mg, ny, nyn, nyn_mg, nys, nys_mg, &
106	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
107	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
108	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
109
110	#if defined( __parallel )
111	USE indices, &
112	ONLY: mg_loc_ind, nbgp, nx_a, nx_o, ny_a, ny_o
113	#endif
114
115	USE kinds
116
117	USE pegrid
118
119	#if defined( __parallel )
120	USE pmc_interface, &
121	ONLY: nested_run
122
123	USE spectra_mod, &
124	ONLY: calculate_spectra
125
126	USE synthetic_turbulence_generator_mod, &
127	ONLY: id_stg_left, id_stg_north, id_stg_right, id_stg_south, &
128	use_syn_turb_gen
129	#endif
130
131	USE transpose_indices, &
132	ONLY: nxl_y, nxl_z, nxr_y, nxr_z, nyn_x, nyn_z, nys_x,&
133	nys_z, nzb_x, nzb_y, nzt_x, nzt_y
134
135	#if defined( __parallel )
136	USE transpose_indices, &
137	ONLY: nxl_yd, nxr_yd, nzb_yd, nzt_yd
138
139	USE vertical_nesting_mod, &
140	ONLY: vnested, vnest_init_pegrid_domain, vnest_init_pegrid_rank
141	#endif
142
143	IMPLICIT NONE
144
145	INTEGER(iwp) :: i !< running index over number of processors or number of multigrid level
146	#if defined( __parallel )
147	INTEGER(iwp) :: id_inflow_l !< ID indicating processors located at the left inflow boundary
148	INTEGER(iwp) :: id_outflow_l !< local value of id_outflow
149	INTEGER(iwp) :: id_outflow_source_l !< local value of id_outflow_source
150	INTEGER(iwp) :: id_recycling_l !< ID indicating processors located at the recycling plane
151	INTEGER(iwp) :: id_stg_left_l !< left lateral boundary local core id in case of turbulence generator
152	INTEGER(iwp) :: id_stg_north_l !< north lateral boundary local core id in case of turbulence generator
153	INTEGER(iwp) :: id_stg_right_l !< right lateral boundary local core id in case of turbulence generator
154	INTEGER(iwp) :: id_stg_south_l !< south lateral boundary local core id in case of turbulence generator
155	INTEGER(iwp) :: ind(5) !< array containing the subdomain bounds
156	#endif
157	INTEGER(iwp) :: j !< running index, used for various loops
158	INTEGER(iwp) :: k !< number of vertical grid points in different multigrid level
159	INTEGER(iwp) :: maximum_grid_level_l !< maximum number of grid level without switching to PE 0
160	INTEGER(iwp) :: mg_levels_x !< maximum number of grid level allowed along x-direction
161	INTEGER(iwp) :: mg_levels_y !< maximum number of grid level allowed along y-direction
162	INTEGER(iwp) :: mg_levels_z !< maximum number of grid level allowed along z-direction
163	INTEGER(iwp) :: mg_switch_to_pe0_level_l !< maximum number of grid level with switching to PE 0
164	#if defined( __parallel )
165	INTEGER(iwp) :: nnx_y !< quotient of number of grid points along x-direction and number of PEs used along y-direction
166	INTEGER(iwp) :: nny_x !< quotient of number of grid points along y-direction and number of PEs used along x-direction
167	INTEGER(iwp) :: nny_z !< quotient of number of grid points along y-direction and number of PEs used along x-direction
168	INTEGER(iwp) :: nnz_x !< quotient of number of grid points along z-direction and number of PEs used along x-direction
169	INTEGER(iwp) :: nnz_y !< quotient of number of grid points along z-direction and number of PEs used along x-direction
170	INTEGER(iwp) :: numproc_sqr !< square root of the number of processors
171	#endif
172	INTEGER(iwp) :: nxl_l !< lower index bound along x-direction on subdomain and different multigrid level
173	INTEGER(iwp) :: nxr_l !< upper index bound along x-direction on subdomain and different multigrid level
174	INTEGER(iwp) :: nyn_l !< lower index bound along y-direction on subdomain and different multigrid level
175	INTEGER(iwp) :: nys_l !< upper index bound along y-direction on subdomain and different multigrid level
176	#if defined( __parallel )
177	INTEGER(iwp) :: nzb_l !< lower index bound along z-direction on subdomain and different multigrid level
178	#endif
179	INTEGER(iwp) :: nzt_l !< upper index bound along z-direction on subdomain and different multigrid level
180	!$ INTEGER(iwp) :: omp_get_num_threads !< number of OpenMP threads
181
182	#if defined( __parallel )
183	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !< dummy array containing index bounds on subdomain, used for gathering
184	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !< lower index bound allong x-direction for every PE
185	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !< upper index bound allong x-direction for every PE
186	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !< lower index bound allong y-direction for every PE
187	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !< lower index bound allong y-direction for every PE
188
189	INTEGER(iwp), DIMENSION(2) :: pdims_remote !< number of PEs used for coupled model (only in atmospher-ocean coupling)
190	INTEGER(iwp) :: lcoord(2) !< PE coordinates of left neighbor along x and y
191	INTEGER(iwp) :: rcoord(2) !< PE coordinates of right neighbor along x and y
192	#endif
193
194	!
195	!-- Get the number of OpenMP threads
196	!$OMP PARALLEL
197	!$ threads_per_task = omp_get_num_threads()
198	!$OMP END PARALLEL
199
200
201	#if defined( __parallel )
202
203	CALL location_message( 'creating virtual PE grids + MPI derived data types', 'start' )
204
205	!
206	!-- Determine the processor topology or check it, if prescribed by the user
207	IF ( npex == -1 .AND. npey == -1 ) THEN
208
209	!
210	!-- Automatic determination of the topology
211	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
212	pdims(1) = MAX( numproc_sqr , 1 )
213	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
214	pdims(1) = pdims(1) - 1
215	ENDDO
216	pdims(2) = numprocs / pdims(1)
217
218	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
219
220	!
221	!-- Prescribed by user. Number of processors on the prescribed topology
222	!-- must be equal to the number of PEs available to the job
223	IF ( ( npex * npey ) /= numprocs ) THEN
224	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
225	'topology (', npex*npey,') does not match & the number of ', &
226	'PEs available to the job (', numprocs, ')'
227	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
228	ENDIF
229	pdims(1) = npex
230	pdims(2) = npey
231
232	ELSE
233	!
234	!-- If the processor topology is prescribed by the user, the number of
235	!-- PEs must be given in both directions
236	message_string = 'if the processor topology is prescribed by th' // &
237	'e user & both values of "npex" and "npey" must be given' // &
238	' in the &NAMELIST-parameter file'
239	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
240
241	ENDIF
242
243	!
244	!-- If necessary, set horizontal boundary conditions to non-cyclic
245	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
246	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
247
248
249	!
250	!-- Create the virtual processor grid
251	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
252	comm2d, ierr )
253	CALL MPI_COMM_RANK( comm2d, myid, ierr )
254	WRITE (myid_char,'(''_'',I6.6)') myid
255
256	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
257	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
258	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
259	!
260	!-- In case of cyclic boundary conditions, a y-shift at the boundaries in
261	!-- x-direction can be introduced via parameter y_shift. The shift is done
262	!-- by modifying the processor grid in such a way that processors located
263	!-- at the x-boundary communicate across it to processors with y-coordinate
264	!-- shifted by y_shift relative to their own. This feature can not be used
265	!-- in combination with an fft pressure solver. It has been implemented to
266	!-- counter the effect of streak structures in case of cyclic boundary
267	!-- conditions. For a description of these see Munters
268	!-- (2016; dx.doi.org/10.1063/1.4941912)
269	!--
270	!-- Get coordinates of left and right neighbor on PE grid
271	IF ( y_shift /= 0 ) THEN
272	IF ( bc_lr == 'cyclic' ) THEN
273	IF ( TRIM( psolver ) /= 'multigrid' .AND. &
274	TRIM( psolver ) /= 'multigrid_noopt') &
275	THEN
276	message_string = 'y_shift /= 0 requires a multigrid pressure solver '
277	CALL message( 'check_parameters', 'PA0468', 1, 2, 0, 6, 0 )
278	ENDIF
279
280	CALL MPI_CART_COORDS( comm2d, pright, ndim, rcoord, ierr )
281	CALL MPI_CART_COORDS( comm2d, pleft, ndim, lcoord, ierr )
282
283	!
284	!-- If the x(y)-coordinate of the right (left) neighbor is smaller (greater)
285	!-- than that of the calling process, then the calling process is located on
286	!-- the right (left) boundary of the processor grid. In that case,
287	!-- the y-coordinate of that neighbor is increased (decreased) by y_shift.
288	!-- The rank of the process with that coordinate is then inquired and the
289	!-- neighbor rank for MPI_SENDRECV, pright (pleft) is set to it.
290	!-- In this way, the calling process receives a new right (left) neighbor
291	!-- for all future MPI_SENDRECV calls. That neighbor has a y-coordinate
292	!-- of y+(-)y_shift, where y is the original right (left) neighbor's
293	!-- y-coordinate. The modulo-operation ensures that if the neighbor's
294	!-- y-coordinate exceeds the grid-boundary, it will be relocated to
295	!-- the opposite part of the grid cyclicly.
296	IF ( rcoord(1) < pcoord(1) ) THEN
297	rcoord(2) = MODULO( rcoord(2) + y_shift, pdims(2) )
298	CALL MPI_CART_RANK( comm2d, rcoord, pright, ierr )
299	ENDIF
300
301	IF ( lcoord(1) > pcoord(1) ) THEN
302	lcoord(2) = MODULO( lcoord(2) - y_shift, pdims(2) )
303	CALL MPI_CART_RANK( comm2d, lcoord, pleft, ierr )
304	ENDIF
305
306	ELSE
307	!
308	!-- y-shift for non-cyclic boundary conditions is only implemented
309	!-- for the turbulence recycling method in inflow_turbulence.f90
310	IF ( .NOT. turbulent_inflow ) THEN
311	message_string = 'y_shift /= 0 is only allowed for cyclic ' // &
312	'boundary conditions in both directions ' // &
313	'or with turbulent_inflow == .TRUE.'
314	CALL message( 'check_parameters', 'PA0467', 1, 2, 0, 6, 0 )
315	ENDIF
316	ENDIF
317	ENDIF
318	!
319	!-- Vertical nesting: store four lists that identify partner ranks to exchange
320	!-- data
321	IF ( vnested ) CALL vnest_init_pegrid_rank
322
323	!
324	!-- Determine sub-topologies for transpositions
325	!-- Transposition from z to x:
326	remain_dims(1) = .TRUE.
327	remain_dims(2) = .FALSE.
328	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
329	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
330	!
331	!-- Transposition from x to y
332	remain_dims(1) = .FALSE.
333	remain_dims(2) = .TRUE.
334	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
335	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
336
337
338	!
339	!-- Calculate array bounds along x-direction for every PE.
340	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
341	nysf(0:pdims(2)-1) )
342
343	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
344	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ', &
345	'is not an& integral multiple of the number',&
346	' of processors (',pdims(1),')'
347	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
348	ELSE
349	nnx = ( nx + 1 ) / pdims(1)
350	ENDIF
351
352	!
353	!-- Left and right array bounds, number of gridpoints
354	DO i = 0, pdims(1)-1
355	nxlf(i) = i * nnx
356	nxrf(i) = ( i + 1 ) * nnx - 1
357	ENDDO
358
359	!
360	!-- Calculate array bounds in y-direction for every PE.
361	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
362	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
363	'is not an& integral multiple of the number',&
364	' of processors (',pdims(2),')'
365	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
366	ELSE
367	nny = ( ny + 1 ) / pdims(2)
368	ENDIF
369
370	!
371	!-- South and north array bounds
372	DO j = 0, pdims(2)-1
373	nysf(j) = j * nny
374	nynf(j) = ( j + 1 ) * nny - 1
375	ENDDO
376
377	!
378	!-- Local array bounds of the respective PEs
379	nxl = nxlf(pcoord(1))
380	nxr = nxrf(pcoord(1))
381	nys = nysf(pcoord(2))
382	nyn = nynf(pcoord(2))
383	nzb = 0
384	nzt = nz
385	nnz = nz
386
387	!
388	!-- Set switches to define if the PE is situated at the border of the virtual
389	!-- processor grid
390	IF ( nxl == 0 ) left_border_pe = .TRUE.
391	IF ( nxr == nx ) right_border_pe = .TRUE.
392	IF ( nys == 0 ) south_border_pe = .TRUE.
393	IF ( nyn == ny ) north_border_pe = .TRUE.
394
395	!
396	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
397	!-- (needed in the pressure solver)
398	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
399	!-- boundaries are omitted, because they are obstructive to the transposition
400
401	!
402	!-- 1. transposition z --> x
403	!-- This transposition is not neccessary in case of a 1d-decomposition along x
404	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
405
406	IF ( pdims(2) /= 1 ) THEN
407	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
408	WRITE( message_string, * ) 'transposition z --> x:& ', &
409	'nz=',nz,' is not an integral multiple ',&
410	'of pdims(1)=',pdims(1)
411	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
412	ENDIF
413	ENDIF
414
415	nys_x = nys
416	nyn_x = nyn
417	nny_x = nny
418	nnz_x = nz / pdims(1)
419	nzb_x = 1 + myidx * nnz_x
420	nzt_x = ( myidx + 1 ) * nnz_x
421	sendrecvcount_zx = nnx * nny * nnz_x
422
423	ENDIF
424
425
426	IF ( psolver == 'poisfft' ) THEN
427	!
428	!-- 2. transposition x --> y
429	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
430	WRITE( message_string, * ) 'transposition x --> y:& ', &
431	'nx+1=',nx+1,' is not an integral ', &
432	'multiple of pdims(2)=',pdims(2)
433	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
434	ENDIF
435
436	nnz_y = nnz_x
437	nzb_y = nzb_x
438	nzt_y = nzt_x
439	nnx_y = (nx+1) / pdims(2)
440	nxl_y = myidy * nnx_y
441	nxr_y = ( myidy + 1 ) * nnx_y - 1
442	sendrecvcount_xy = nnx_y * nny_x * nnz_y
443	!
444	!-- 3. transposition y --> z
445	!-- (ELSE: x --> y in case of 1D-decomposition along x)
446	nxl_z = nxl_y
447	nxr_z = nxr_y
448	nny_z = (ny+1) / pdims(1)
449	nys_z = myidx * nny_z
450	nyn_z = ( myidx + 1 ) * nny_z - 1
451	sendrecvcount_yz = nnx_y * nny_z * nnz_y
452
453	IF ( pdims(2) /= 1 ) THEN
454	!
455	!-- y --> z
456	!-- This transposition is not neccessary in case of a 1d-decomposition
457	!-- along x, except that the uptream-spline method is switched on
458	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
459	WRITE( message_string, * ) 'transposition y --> z:& ', &
460	'ny+1=',ny+1,' is not an integral ', &
461	'multiple of pdims(1)=',pdims(1)
462	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
463	ENDIF
464
465	ELSE
466	!
467	!-- x --> y
468	!-- This condition must be fulfilled for a 1D-decomposition along x
469	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
470	WRITE( message_string, * ) 'transposition x --> y:& ', &
471	'ny+1=',ny+1,' is not an integral ', &
472	'multiple of pdims(1)=',pdims(1)
473	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
474	ENDIF
475
476	ENDIF
477
478	ENDIF
479
480	!
481	!-- Indices for direct transpositions z --> y (used for calculating spectra)
482	IF ( calculate_spectra ) THEN
483	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
484	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
485	'for spectra):& nz=',nz,' is not an ', &
486	'integral multiple of pdims(2)=',pdims(2)
487	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
488	ELSE
489	nxl_yd = nxl
490	nxr_yd = nxr
491	nzb_yd = 1 + myidy * ( nz / pdims(2) )
492	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
493	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
494	ENDIF
495	ENDIF
496
497	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
498	!
499	!-- Indices for direct transpositions y --> x
500	!-- (they are only possible in case of a 1d-decomposition along x)
501	IF ( pdims(2) == 1 ) THEN
502	nny_x = nny / pdims(1)
503	nys_x = myid * nny_x
504	nyn_x = ( myid + 1 ) * nny_x - 1
505	nzb_x = 1
506	nzt_x = nz
507	sendrecvcount_xy = nnx * nny_x * nz
508	ENDIF
509
510	ENDIF
511
512	IF ( psolver == 'poisfft' ) THEN
513	!
514	!-- Indices for direct transpositions x --> y
515	!-- (they are only possible in case of a 1d-decomposition along y)
516	IF ( pdims(1) == 1 ) THEN
517	nnx_y = nnx / pdims(2)
518	nxl_y = myid * nnx_y
519	nxr_y = ( myid + 1 ) * nnx_y - 1
520	nzb_y = 1
521	nzt_y = nz
522	sendrecvcount_xy = nnx_y * nny * nz
523	ENDIF
524
525	ENDIF
526
527	!
528	!-- Arrays for storing the array bounds are needed any more
529	DEALLOCATE( nxlf , nxrf , nynf , nysf )
530
531
532	!
533	!-- Collect index bounds from other PEs (to be written to restart file later)
534	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
535
536	IF ( myid == 0 ) THEN
537
538	hor_index_bounds(1,0) = nxl
539	hor_index_bounds(2,0) = nxr
540	hor_index_bounds(3,0) = nys
541	hor_index_bounds(4,0) = nyn
542
543	!
544	!-- Receive data from all other PEs
545	DO i = 1, numprocs-1
546	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
547	ierr )
548	hor_index_bounds(:,i) = ibuf(1:4)
549	ENDDO
550
551	ELSE
552	!
553	!-- Send index bounds to PE0
554	ibuf(1) = nxl
555	ibuf(2) = nxr
556	ibuf(3) = nys
557	ibuf(4) = nyn
558	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
559
560	ENDIF
561
562
563	#if defined( __print )
564	!
565	!-- Control output
566	IF ( myid == 0 ) THEN
567	PRINT, ' processor topology *'
568	PRINT*, ' '
569	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
570	&' nys: nyn'
571	PRINT*, '------------------------------------------------------------',&
572	&'-----------'
573	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
574	myidx, myidy, nxl, nxr, nys, nyn
575	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
576	2(2X,I4,':',I4))
577
578	!
579	!-- Receive data from the other PEs
580	DO i = 1,numprocs-1
581	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
582	ierr )
583	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
584	ENDDO
585	ELSE
586
587	!
588	!-- Send data to PE0
589	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
590	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
591	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
592	ibuf(12) = nyn
593	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
594	ENDIF
595	#endif
596
597	!
598	!-- Determine the number of ghost point layers
599	IF ( scalar_advec == 'ws-scheme' .OR. &
600	momentum_advec == 'ws-scheme' .OR. nested_run ) THEN
601	nbgp = 3
602	ELSE
603	nbgp = 1
604	ENDIF
605
606	!
607	!-- Check that the number of computational grid points is not smaller than the number of
608	!-- ghost points.
609	IF ( nnx < nbgp ) THEN
610	WRITE( message_string, * ) 'number of subdomain grid points along x (', nnx, ') is smaller',&
611	'than the number of ghost points (', nbgp, ')'
612	CALL message( 'init_pegrid', 'PA0682', 1, 2, 0, 6, 0 )
613	ENDIF
614	IF ( nny < nbgp ) THEN
615	WRITE( message_string, * ) 'number of subdomain grid points along y (', nny, ') is smaller',&
616	'than the number of ghost points (', nbgp, ')'
617	CALL message( 'init_pegrid', 'PA0683', 1, 2, 0, 6, 0 )
618	ENDIF
619
620	!
621	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
622	!-- which is needed for coupled atmosphere-ocean runs.
623	!-- First, calculate number of grid points of an xy-plane.
624	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
625	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
626	CALL MPI_TYPE_COMMIT( type_xy, ierr )
627
628	IF ( TRIM( coupling_mode ) /= 'uncoupled' .AND. .NOT. vnested ) THEN
629
630	!
631	!-- Pass the number of grid points of the atmosphere model to
632	!-- the ocean model and vice versa
633	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
634
635	nx_a = nx
636	ny_a = ny
637
638	IF ( myid == 0 ) THEN
639
640	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
641	ierr )
642	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
643	ierr )
644	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
645	ierr )
646	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
647	status, ierr )
648	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
649	status, ierr )
650	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
651	comm_inter, status, ierr )
652	ENDIF
653
654	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
655	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
656	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
657
658	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
659
660	nx_o = nx
661	ny_o = ny
662
663	IF ( myid == 0 ) THEN
664
665	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
666	ierr )
667	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
668	ierr )
669	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
670	status, ierr )
671	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
672	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
673	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
674	ENDIF
675
676	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
677	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
678	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
679
680	ENDIF
681
682	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
683	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
684
685	!
686	!-- Determine if the horizontal grid and the number of PEs in ocean and
687	!-- atmosphere is same or not
688	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
689	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
690	THEN
691	coupling_topology = 0
692	ELSE
693	coupling_topology = 1
694	ENDIF
695
696	!
697	!-- Determine the target PEs for the exchange between ocean and
698	!-- atmosphere (comm2d)
699	IF ( coupling_topology == 0 ) THEN
700	!
701	!-- In case of identical topologies, every atmosphere PE has exactly one
702	!-- ocean PE counterpart and vice versa
703	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
704	target_id = myid + numprocs
705	ELSE
706	target_id = myid
707	ENDIF
708
709	ELSE
710	!
711	!-- In case of nonequivalent topology in ocean and atmosphere only for
712	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
713	!-- data echxchange between ocean and atmosphere will be done only
714	!-- between these PEs.
715	IF ( myid == 0 ) THEN
716
717	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
718	target_id = numprocs
719	ELSE
720	target_id = 0
721	ENDIF
722
723	ENDIF
724
725	ENDIF
726
727	ENDIF
728
729	!
730	!-- Store partner grid point co-ordinates as lists.
731	!-- Create custom MPI vector datatypes for contiguous data transfer
732	IF ( vnested ) CALL vnest_init_pegrid_domain
733
734	#else
735
736	!
737	!-- Array bounds when running on a single PE (respectively a non-parallel
738	!-- machine)
739	nxl = 0
740	nxr = nx
741	nnx = nxr - nxl + 1
742	nys = 0
743	nyn = ny
744	nny = nyn - nys + 1
745	nzb = 0
746	nzt = nz
747	nnz = nz
748
749	ALLOCATE( hor_index_bounds(4,0:0) )
750	hor_index_bounds(1,0) = nxl
751	hor_index_bounds(2,0) = nxr
752	hor_index_bounds(3,0) = nys
753	hor_index_bounds(4,0) = nyn
754
755	!
756	!-- Array bounds for the pressure solver (in the parallel code, these bounds
757	!-- are the ones for the transposed arrays)
758	nys_x = nys
759	nyn_x = nyn
760	nzb_x = nzb + 1
761	nzt_x = nzt
762
763	nxl_y = nxl
764	nxr_y = nxr
765	nzb_y = nzb + 1
766	nzt_y = nzt
767
768	nxl_z = nxl
769	nxr_z = nxr
770	nys_z = nys
771	nyn_z = nyn
772
773	#endif
774
775	!
776	!-- Calculate number of grid levels necessary for the multigrid poisson solver
777	!-- as well as the gridpoint indices on each level
778	IF ( psolver(1:9) == 'multigrid' ) THEN
779
780	!
781	!-- First calculate number of possible grid levels for the subdomains
782	mg_levels_x = 1
783	mg_levels_y = 1
784	mg_levels_z = 1
785
786	i = nnx
787	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
788	i = i / 2
789	mg_levels_x = mg_levels_x + 1
790	ENDDO
791
792	j = nny
793	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
794	j = j / 2
795	mg_levels_y = mg_levels_y + 1
796	ENDDO
797
798	k = nz ! do not use nnz because it might be > nz due to transposition
799	! requirements
800	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
801	k = k / 2
802	mg_levels_z = mg_levels_z + 1
803	ENDDO
804	!
805	!-- The optimized MG-solver does not allow odd values for nz at the coarsest
806	!-- grid level
807	IF ( TRIM( psolver ) /= 'multigrid_noopt' ) THEN
808	IF ( MOD( k, 2 ) /= 0 ) mg_levels_z = mg_levels_z - 1
809	!
810	!-- An odd value of nz does not work. The finest level must have an even
811	!-- value.
812	IF ( mg_levels_z == 0 ) THEN
813	message_string = 'optimized multigrid method requires nz to be even'
814	CALL message( 'init_pegrid', 'PA0495', 1, 2, 0, 6, 0 )
815	ENDIF
816	ENDIF
817
818	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
819	!
820	!-- Check if subdomain sizes prevents any coarsening.
821	!-- This case, the maximum number of grid levels is 1, i.e. effectively
822	!-- a Gauss-Seidel scheme is applied rather than a multigrid approach.
823	!-- Give a warning in this case.
824	IF ( maximum_grid_level == 1 .AND. mg_switch_to_pe0_level == -1 ) THEN
825	message_string = 'No grid coarsening possible, multigrid ' // &
826	'approach effectively reduces to a Gauss-Seidel ' //&
827	'scheme.'
828
829	CALL message( 'poismg', 'PA0648', 0, 1, 0, 6, 0 )
830	ENDIF
831
832	!
833	!-- Find out, if the total domain allows more levels. These additional
834	!-- levels are identically processed on all PEs.
835	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
836
837	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
838
839	mg_switch_to_pe0_level_l = maximum_grid_level
840
841	mg_levels_x = 1
842	mg_levels_y = 1
843
844	i = nx+1
845	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
846	i = i / 2
847	mg_levels_x = mg_levels_x + 1
848	ENDDO
849
850	j = ny+1
851	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
852	j = j / 2
853	mg_levels_y = mg_levels_y + 1
854	ENDDO
855
856	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
857
858	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
859	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
860	mg_switch_to_pe0_level_l + 1
861	ELSE
862	mg_switch_to_pe0_level_l = 0
863	ENDIF
864
865	ELSE
866
867	mg_switch_to_pe0_level_l = 0
868	maximum_grid_level_l = maximum_grid_level
869
870	ENDIF
871
872	!
873	!-- Use switch level calculated above only if it is not pre-defined
874	!-- by user
875	IF ( mg_switch_to_pe0_level == 0 ) THEN
876	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
877	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
878	maximum_grid_level = maximum_grid_level_l
879	ENDIF
880
881	ELSE
882	!
883	!-- Check pre-defined value and reset to default, if neccessary
884	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
885	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
886	message_string = 'mg_switch_to_pe0_level ' // &
887	'out of range and reset to 0'
888	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
889	mg_switch_to_pe0_level = 0
890	ELSE
891	!
892	!-- Use the largest number of possible levels anyway and recalculate
893	!-- the switch level to this largest number of possible values
894	maximum_grid_level = maximum_grid_level_l
895
896	ENDIF
897
898	ENDIF
899
900	ENDIF
901
902	ALLOCATE( grid_level_count(maximum_grid_level), &
903	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
904	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
905	nzt_mg(0:maximum_grid_level) )
906
907	grid_level_count = 0
908	!
909	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
910	!-- recursive subroutine next_mg_level
911	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
912
913	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
914
915	DO i = maximum_grid_level, 1 , -1
916
917	IF ( i == mg_switch_to_pe0_level ) THEN
918	#if defined( __parallel )
919	!
920	!-- Save the grid size of the subdomain at the switch level, because
921	!-- it is needed in poismg.
922	ind(1) = nxl_l; ind(2) = nxr_l
923	ind(3) = nys_l; ind(4) = nyn_l
924	ind(5) = nzt_l
925	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
926	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
927	MPI_INTEGER, comm2d, ierr )
928	DO j = 0, numprocs-1
929	DO k = 1, 5
930	mg_loc_ind(k,j) = ind_all(k+j*5)
931	ENDDO
932	ENDDO
933	DEALLOCATE( ind_all )
934	!
935	!-- Calculate the grid size of the total domain
936	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
937	nxl_l = 0
938	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
939	nys_l = 0
940	!
941	!-- The size of this gathered array must not be larger than the
942	!-- array tend, which is used in the multigrid scheme as a temporary
943	!-- array. Therefore the subdomain size of an PE is calculated and
944	!-- the size of the gathered grid. These values are used in
945	!-- routines pres and poismg
946	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
947	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
948	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
949	( nzt_l - nzb + 2 )
950
951	#else
952	message_string = 'multigrid gather/scatter impossible ' // &
953	'in non parallel mode'
954	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
955	#endif
956	ENDIF
957
958	nxl_mg(i) = nxl_l
959	nxr_mg(i) = nxr_l
960	nys_mg(i) = nys_l
961	nyn_mg(i) = nyn_l
962	nzt_mg(i) = nzt_l
963
964	nxl_l = nxl_l / 2
965	nxr_l = nxr_l / 2
966	nys_l = nys_l / 2
967	nyn_l = nyn_l / 2
968	nzt_l = nzt_l / 2
969
970	ENDDO
971
972	!
973	!-- Temporary problem: Currently calculation of maxerror in routine poismg crashes
974	!-- if grid data are collected on PE0 already on the finest grid level.
975	!-- To be solved later.
976	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
977	message_string = 'grid coarsening on subdomain level cannot be performed'
978	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
979	ENDIF
980
981	ELSE
982
983	maximum_grid_level = 0
984
985	ENDIF
986
987	!
988	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
989	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
990	!-- is required.
991	grid_level = 0
992
993	#if defined( __parallel )
994	!
995	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
996	ngp_y = nyn - nys + 1 + 2 * nbgp
997
998	!
999	!-- Define new MPI derived datatypes for the exchange of ghost points in
1000	!-- x- and y-direction for 2D-arrays (line)
1001	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
1002	ierr )
1003	CALL MPI_TYPE_COMMIT( type_x, 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	!
1008	!-- Define new MPI derived datatypes for the exchange of ghost points in
1009	!-- x- and y-direction for 2D-INTEGER arrays (line) - on normal grid.
1010	!-- Define types for 32-bit and 8-bit Integer. The 8-bit Integer are only
1011	!-- required on normal grid, while 32-bit Integer may be also required on
1012	!-- coarser grid level in case of multigrid solver.
1013	!
1014	!-- 8-bit Integer
1015	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_BYTE, &
1016	type_x_byte, ierr )
1017	CALL MPI_TYPE_COMMIT( type_x_byte, ierr )
1018
1019	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_BYTE, &
1020	type_y_byte, ierr )
1021	CALL MPI_TYPE_COMMIT( type_y_byte, ierr )
1022	!
1023	!-- 32-bit Integer
1024	ALLOCATE( type_x_int(0:maximum_grid_level), &
1025	type_y_int(0:maximum_grid_level) )
1026
1027	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
1028	type_x_int(0), ierr )
1029	CALL MPI_TYPE_COMMIT( type_x_int(0), ierr )
1030
1031	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int(0), ierr )
1032	CALL MPI_TYPE_COMMIT( type_y_int(0), ierr )
1033	!
1034	!-- Calculate gridpoint numbers for the exchange of ghost points along x
1035	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
1036	!-- exchange of ghost points in y-direction (xz-plane).
1037	!-- Do these calculations for the model grid and (if necessary) also
1038	!-- for the coarser grid levels used in the multigrid method
1039	ALLOCATE ( ngp_xz(0:maximum_grid_level), &
1040	ngp_xz_int(0:maximum_grid_level), &
1041	ngp_yz(0:maximum_grid_level), &
1042	ngp_yz_int(0:maximum_grid_level), &
1043	type_xz(0:maximum_grid_level), &
1044	type_xz_int(0:maximum_grid_level), &
1045	type_yz(0:maximum_grid_level), &
1046	type_yz_int(0:maximum_grid_level) )
1047
1048	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
1049
1050	!
1051	!-- Discern between the model grid, which needs nbgp ghost points and
1052	!-- grid levels for the multigrid scheme. In the latter case only one
1053	!-- ghost point is necessary.
1054	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
1055	!-- grid. The following loop is needed for data exchange in poismg.f90.
1056	!
1057	!-- Determine number of grid points of yz-layer for exchange
1058	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1059
1060	!
1061	!-- Define an MPI-datatype for the exchange of left/right boundaries.
1062	!-- Although data are contiguous in physical memory (which does not
1063	!-- necessarily require an MPI-derived datatype), the data exchange between
1064	!-- left and right PE's using the MPI-derived type is 10% faster than without.
1065	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
1066	MPI_REAL, type_xz(0), ierr )
1067	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
1068
1069	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
1070	ierr )
1071	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
1072
1073	!
1074	!-- Define data types for exchange of 3D Integer arrays.
1075	ngp_yz_int(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
1076
1077	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int(0), &
1078	MPI_INTEGER, type_xz_int(0), ierr )
1079	CALL MPI_TYPE_COMMIT( type_xz_int(0), ierr )
1080
1081	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int(0), ngp_yz_int(0), MPI_INTEGER, &
1082	type_yz_int(0), ierr )
1083	CALL MPI_TYPE_COMMIT( type_yz_int(0), ierr )
1084
1085	!
1086	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
1087	IF ( psolver(1:9) == 'multigrid' ) THEN
1088	!
1089	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
1090	DO i = maximum_grid_level, 1 , -1
1091	!
1092	!-- For 3D-exchange on different multigrid level, one ghost point for
1093	!-- REAL arrays, two ghost points for INTEGER arrays
1094	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1095	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1096
1097	ngp_xz_int(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
1098	ngp_yz_int(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
1099	!
1100	!-- MPI data type for REAL arrays, for xz-layers
1101	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
1102	MPI_REAL, type_xz(i), ierr )
1103	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
1104
1105	!
1106	!-- MPI data type for INTEGER arrays, for xz-layers
1107	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz_int(i), &
1108	MPI_INTEGER, type_xz_int(i), ierr )
1109	CALL MPI_TYPE_COMMIT( type_xz_int(i), ierr )
1110
1111	!
1112	!-- MPI data type for REAL arrays, for yz-layers
1113	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
1114	ierr )
1115	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
1116	!
1117	!-- MPI data type for INTEGER arrays, for yz-layers
1118	CALL MPI_TYPE_VECTOR( 1, ngp_yz_int(i), ngp_yz_int(i), MPI_INTEGER, &
1119	type_yz_int(i), ierr )
1120	CALL MPI_TYPE_COMMIT( type_yz_int(i), ierr )
1121
1122
1123	!-- For 2D-exchange of INTEGER arrays on coarser grid level, where 2 ghost
1124	!-- points need to be exchanged. Only required for 32-bit Integer arrays.
1125	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+5, 2, nyn_l-nys_l+5, MPI_INTEGER, &
1126	type_x_int(i), ierr )
1127	CALL MPI_TYPE_COMMIT( type_x_int(i), ierr )
1128
1129
1130	CALL MPI_TYPE_VECTOR( 2, nyn_l-nys_l+5, nyn_l-nys_l+5, MPI_INTEGER, &
1131	type_y_int(i), ierr )
1132	CALL MPI_TYPE_COMMIT( type_y_int(i), ierr )
1133
1134	nxl_l = nxl_l / 2
1135	nxr_l = nxr_l / 2
1136	nys_l = nys_l / 2
1137	nyn_l = nyn_l / 2
1138	nzt_l = nzt_l / 2
1139
1140	ENDDO
1141
1142	ENDIF
1143
1144	#endif
1145
1146	#if defined( __parallel )
1147	!
1148	!-- Setting of flags for inflow/outflow/nesting conditions.
1149	IF ( pleft == MPI_PROC_NULL ) THEN
1150	IF ( bc_lr == 'dirichlet/radiation' .OR. bc_lr == 'nested' .OR. &
1151	bc_lr == 'nesting_offline' ) THEN
1152	bc_dirichlet_l = .TRUE.
1153	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1154	bc_radiation_l = .TRUE.
1155	ENDIF
1156	ENDIF
1157
1158	IF ( pright == MPI_PROC_NULL ) THEN
1159	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1160	bc_radiation_r = .TRUE.
1161	ELSEIF ( bc_lr == 'radiation/dirichlet' .OR. bc_lr == 'nested' .OR. &
1162	bc_lr == 'nesting_offline' ) THEN
1163	bc_dirichlet_r = .TRUE.
1164	ENDIF
1165	ENDIF
1166
1167	IF ( psouth == MPI_PROC_NULL ) THEN
1168	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1169	bc_radiation_s = .TRUE.
1170	ELSEIF ( bc_ns == 'radiation/dirichlet' .OR. bc_ns == 'nested' .OR. &
1171	bc_ns == 'nesting_offline' ) THEN
1172	bc_dirichlet_s = .TRUE.
1173	ENDIF
1174	ENDIF
1175
1176	IF ( pnorth == MPI_PROC_NULL ) THEN
1177	IF ( bc_ns == 'dirichlet/radiation' .OR. bc_ns == 'nested' .OR. &
1178	bc_ns == 'nesting_offline' ) THEN
1179	bc_dirichlet_n = .TRUE.
1180	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1181	bc_radiation_n = .TRUE.
1182	ENDIF
1183	ENDIF
1184	!
1185	!-- In case of synthetic turbulence geneartor determine ids.
1186	!-- Please note, if no forcing or nesting is applied, the generator is applied
1187	!-- only at the left lateral boundary.
1188	IF ( use_syn_turb_gen ) THEN
1189	IF ( bc_dirichlet_l ) THEN
1190	id_stg_left_l = myidx
1191	ELSE
1192	id_stg_left_l = 0
1193	ENDIF
1194	IF ( bc_dirichlet_r ) THEN
1195	id_stg_right_l = myidx
1196	ELSE
1197	id_stg_right_l = 0
1198	ENDIF
1199	IF ( bc_dirichlet_s ) THEN
1200	id_stg_south_l = myidy
1201	ELSE
1202	id_stg_south_l = 0
1203	ENDIF
1204	IF ( bc_dirichlet_n ) THEN
1205	id_stg_north_l = myidy
1206	ELSE
1207	id_stg_north_l = 0
1208	ENDIF
1209
1210	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1211	CALL MPI_ALLREDUCE( id_stg_left_l, id_stg_left, 1, MPI_INTEGER, &
1212	MPI_SUM, comm1dx, ierr )
1213
1214	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1215	CALL MPI_ALLREDUCE( id_stg_right_l, id_stg_right, 1, MPI_INTEGER, &
1216	MPI_SUM, comm1dx, ierr )
1217
1218	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1219	CALL MPI_ALLREDUCE( id_stg_south_l, id_stg_south, 1, MPI_INTEGER, &
1220	MPI_SUM, comm1dy, ierr )
1221
1222	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1223	CALL MPI_ALLREDUCE( id_stg_north_l, id_stg_north, 1, MPI_INTEGER, &
1224	MPI_SUM, comm1dy, ierr )
1225
1226	ENDIF
1227
1228	!
1229	!-- Broadcast the id of the inflow PE
1230	IF ( bc_dirichlet_l ) THEN
1231	id_inflow_l = myidx
1232	ELSE
1233	id_inflow_l = 0
1234	ENDIF
1235	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1236	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
1237	comm1dx, ierr )
1238
1239	!
1240	!-- Broadcast the id of the recycling plane
1241	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
1242	IF ( turbulent_inflow ) THEN
1243
1244	IF ( NINT( recycling_width / dx, KIND=idp ) >= nxl .AND. &
1245	NINT( recycling_width / dx, KIND=idp ) <= nxr ) THEN
1246	id_recycling_l = myidx
1247	ELSE
1248	id_recycling_l = 0
1249	ENDIF
1250	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1251	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
1252	comm1dx, ierr )
1253
1254	ENDIF
1255
1256	!
1257	!-- Broadcast the id of the outflow PE and outflow-source plane
1258	IF ( turbulent_outflow ) THEN
1259
1260	IF ( bc_radiation_r ) THEN
1261	id_outflow_l = myidx
1262	ELSE
1263	id_outflow_l = 0
1264	ENDIF
1265	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1266	CALL MPI_ALLREDUCE( id_outflow_l, id_outflow, 1, MPI_INTEGER, MPI_SUM, &
1267	comm1dx, ierr )
1268
1269	IF ( NINT( outflow_source_plane / dx ) >= nxl .AND. &
1270	NINT( outflow_source_plane / dx ) <= nxr ) THEN
1271	id_outflow_source_l = myidx
1272	ELSE
1273	id_outflow_source_l = 0
1274	ENDIF
1275	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1276	CALL MPI_ALLREDUCE( id_outflow_source_l, id_outflow_source, 1, &
1277	MPI_INTEGER, MPI_SUM, comm1dx, ierr )
1278
1279	ENDIF
1280
1281	CALL location_message( 'creating virtual PE grids + MPI derived data types', 'finished' )
1282
1283	#else
1284	IF ( bc_lr == 'dirichlet/radiation' ) THEN
1285	bc_dirichlet_l = .TRUE.
1286	bc_radiation_r = .TRUE.
1287	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
1288	bc_radiation_l = .TRUE.
1289	bc_dirichlet_r = .TRUE.
1290	ENDIF
1291
1292	IF ( bc_ns == 'dirichlet/radiation' ) THEN
1293	bc_dirichlet_n = .TRUE.
1294	bc_radiation_s = .TRUE.
1295	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
1296	bc_radiation_n = .TRUE.
1297	bc_dirichlet_s = .TRUE.
1298	ENDIF
1299	#endif
1300
1301	!
1302	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
1303	!-- one more grid point.
1304	IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN
1305	nxlu = nxl + 1
1306	ELSE
1307	nxlu = nxl
1308	ENDIF
1309	IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN
1310	nysv = nys + 1
1311	ELSE
1312	nysv = nys
1313	ENDIF
1314
1315	!
1316	!-- Allocate wall flag arrays used in the multigrid solver
1317	IF ( psolver(1:9) == 'multigrid' ) THEN
1318
1319	DO i = maximum_grid_level, 1, -1
1320
1321	SELECT CASE ( i )
1322
1323	CASE ( 1 )
1324	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
1325	nys_mg(i)-1:nyn_mg(i)+1, &
1326	nxl_mg(i)-1:nxr_mg(i)+1) )
1327
1328	CASE ( 2 )
1329	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
1330	nys_mg(i)-1:nyn_mg(i)+1, &
1331	nxl_mg(i)-1:nxr_mg(i)+1) )
1332
1333	CASE ( 3 )
1334	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
1335	nys_mg(i)-1:nyn_mg(i)+1, &
1336	nxl_mg(i)-1:nxr_mg(i)+1) )
1337
1338	CASE ( 4 )
1339	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
1340	nys_mg(i)-1:nyn_mg(i)+1, &
1341	nxl_mg(i)-1:nxr_mg(i)+1) )
1342
1343	CASE ( 5 )
1344	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
1345	nys_mg(i)-1:nyn_mg(i)+1, &
1346	nxl_mg(i)-1:nxr_mg(i)+1) )
1347
1348	CASE ( 6 )
1349	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
1350	nys_mg(i)-1:nyn_mg(i)+1, &
1351	nxl_mg(i)-1:nxr_mg(i)+1) )
1352
1353	CASE ( 7 )
1354	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
1355	nys_mg(i)-1:nyn_mg(i)+1, &
1356	nxl_mg(i)-1:nxr_mg(i)+1) )
1357
1358	CASE ( 8 )
1359	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
1360	nys_mg(i)-1:nyn_mg(i)+1, &
1361	nxl_mg(i)-1:nxr_mg(i)+1) )
1362
1363	CASE ( 9 )
1364	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
1365	nys_mg(i)-1:nyn_mg(i)+1, &
1366	nxl_mg(i)-1:nxr_mg(i)+1) )
1367
1368	CASE ( 10 )
1369	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
1370	nys_mg(i)-1:nyn_mg(i)+1, &
1371	nxl_mg(i)-1:nxr_mg(i)+1) )
1372
1373	CASE DEFAULT
1374	message_string = 'more than 10 multigrid levels'
1375	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
1376
1377	END SELECT
1378
1379	ENDDO
1380
1381	ENDIF
1382
1383	END SUBROUTINE init_pegrid

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