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source: palm/trunk/SOURCE/init_pegrid.f90 @ 3170

Last change on this file since 3170 was 3058, checked in by raasch, 6 years ago
bugfix: wrong error number in r3057 revised
Property svn:keywords set to `Id`
File size: 51.8 KB

Rev	Line
[1682]	1	!> @file init_pegrid.f90
[2000]	2	!------------------------------------------------------------------------------!
[2696]	3	! This file is part of the PALM model system.
[1036]	4	!
[2000]	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.
[1036]	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	!
[2718]	17	! Copyright 1997-2018 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[254]	20	! Current revisions:
[1322]	21	! ------------------
[2201]	22	!
[3049]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_pegrid.f90 3058 2018-06-05 09:21:14Z suehring $
[3058]	27	! bugfix: wrong error number in r3057 revised
	28	!
	29	! 3057 2018-06-05 09:03:41Z raasch
[3057]	30	! bugfix: check that nz is even in case that optimized multigrid is used
	31	!
	32	! 3049 2018-05-29 13:52:36Z Giersch
[3045]	33	! Error messages revised
	34	!
[3049]	35	! 3045 2018-05-28 07:55:41Z Giersch
	36	! Error messages revised
	37	!
[3045]	38	! 2938 2018-03-27 15:52:42Z suehring
[2938]	39	! - No checks for domain decomposition in case of turbulence generator
	40	! (is done in stg module)
	41	! - Introduce ids to indicate lateral processors for turbulence generator
	42	!
	43	! 2936 2018-03-27 14:49:27Z suehring
[2776]	44	! Variable use_synthetic_turbulence_generator has been abbreviated
	45	!
	46	! 2718 2018-01-02 08:49:38Z maronga
[2716]	47	! Corrected "Former revisions" section
	48	!
	49	! 2696 2017-12-14 17:12:51Z kanani
	50	! Change in file header (GPL part)
[2696]	51	! 3D-Integer exchange on multigrid level (MS)
	52	! Forcing implemented (MS)
	53	!
	54	! 2600 2017-11-01 14:11:20Z raasch
[2600]	55	! calculation of block-I/O quantitites removed (is now done in parin)
	56	!
	57	! 2516 2017-10-04 11:03:04Z suehring
[2516]	58	! Remove tabs
	59	!
	60	! 2514 2017-10-04 09:52:37Z suehring
[2414]	61	! Redundant preprocessor directives removed
	62	!
	63	! 2372 2017-08-25 12:37:32Z sward
[2372]	64	! Shifted cyclic boundary conditions implemented
	65	!
	66	! 2365 2017-08-21 14:59:59Z kanani
[2365]	67	! Vertical nesting implemented (SadiqHuq)
	68	!
	69	! 2300 2017-06-29 13:31:14Z raasch
[2300]	70	! host-specific settings removed
	71	!
	72	! 2298 2017-06-29 09:28:18Z raasch
[2298]	73	! MPI2 related parts removed
	74	!
	75	! 2271 2017-06-09 12:34:55Z sward
[2271]	76	! Error message changed
	77	!
	78	! 2259 2017-06-08 09:09:11Z gronemeier
[2259]	79	! Implemented synthetic turbulence generator
	80	!
	81	! 2238 2017-05-31 16:49:16Z suehring
[2238]	82	! Remove unnecessary module load of pmc_interface
	83	!
	84	! 2231 2017-05-30 16:44:33Z suehring
[1321]	85	!
[2201]	86	! 2200 2017-04-11 11:37:51Z suehring
	87	! monotonic_adjustment removed
	88	!
[2198]	89	! 2197 2017-03-24 02:25:00Z raasch
	90	! bugfix: do not allow odd values for nz at the coarsest grid level in case of
	91	! optimized multigrid solver
	92	!
[2181]	93	! 2180 2017-03-17 13:33:05Z hellstea
	94	! Checks to ensure (2178) that pdims match the grid dimensions in the
	95	! automatic determination of pdims are canceled as unnecessary
	96	!
[2179]	97	! 2178 2017-03-17 11:07:39Z hellstea
	98	! Checks to ensure that pdims match the grid dimensions are added in the
	99	! automatic determination of pdims
	100	!
[2051]	101	! 2050 2016-11-08 15:00:55Z gronemeier
	102	! Implement turbulent outflow condition
	103	!
[2001]	104	! 2000 2016-08-20 18:09:15Z knoop
	105	! Forced header and separation lines into 80 columns
	106	!
[1969]	107	! 1968 2016-07-18 12:01:49Z suehring
	108	! Extent MPI-datatypes for exchange of 2D-INTEGER arrays on coarser multigrid
	109	! level
	110	!
[1965]	111	! 1964 2016-07-14 15:35:18Z hellstea
	112	! Bugfix: erroneous setting of nest_bound_l/r/s/n = .TRUE. for vertical nesting mode removed.
[1968]	113	!
[1933]	114	! 1923 2016-05-31 16:37:07Z boeske
	115	! Initial version of purely vertical nesting introduced.
	116	!
[1923]	117	! 1922 2016-05-31 16:36:08Z boeske
	118	! Bugfix: array transposition checks restricted to cases if a fourier
	119	! transform is used , removed unused variable nnx_z
	120	!
[1834]	121	! 1833 2016-04-07 14:23:03Z raasch
	122	! spectra related variables moved to spectra_mod
	123	!
[1816]	124	! 1815 2016-04-06 13:49:59Z raasch
	125	! cpp-directives for intel openmp bug removed
	126	!
[1805]	127	! 1804 2016-04-05 16:30:18Z maronga
	128	! Removed code for parameter file check (__check)
	129	!
[1780]	130	! 1779 2016-03-03 08:01:28Z raasch
	131	! changes regarding nested domain removed: virtual PE grid will be automatically
	132	! calculated for nested runs too
	133	!
[1765]	134	! 1764 2016-02-28 12:45:19Z raasch
	135	! cpp-statements for nesting removed
	136	!
[1763]	137	! 1762 2016-02-25 12:31:13Z hellstea
	138	! Introduction of nested domain feature
	139	!
[1683]	140	! 1682 2015-10-07 23:56:08Z knoop
	141	! Code annotations made doxygen readable
	142	!
[1678]	143	! 1677 2015-10-02 13:25:23Z boeske
	144	! New MPI-data types for exchange of 3D integer arrays.
	145	!
[1576]	146	! 1575 2015-03-27 09:56:27Z raasch
	147	! adjustments for psolver-queries, calculation of ngp_xz added
	148	!
[1566]	149	! 1565 2015-03-09 20:59:31Z suehring
	150	! Refine if-clause for setting nbgp.
	151	!
[1558]	152	! 1557 2015-03-05 16:43:04Z suehring
	153	! Adjustment for monotonic limiter
	154	!
[1469]	155	! 1468 2014-09-24 14:06:57Z maronga
	156	! Adapted for use on up to 6-digit processor cores
	157	!
[1436]	158	! 1435 2014-07-21 10:37:02Z keck
	159	! bugfix: added missing parameter coupling_mode_remote to ONLY-attribute
	160	!
[1403]	161	! 1402 2014-05-09 14:25:13Z raasch
	162	! location messages modified
	163	!
[1385]	164	! 1384 2014-05-02 14:31:06Z raasch
	165	! location messages added
	166	!
[1354]	167	! 1353 2014-04-08 15:21:23Z heinze
	168	! REAL constants provided with KIND-attribute
	169	!
[1323]	170	! 1322 2014-03-20 16:38:49Z raasch
	171	! REAL functions provided with KIND-attribute
	172	!
[1321]	173	! 1320 2014-03-20 08:40:49Z raasch
[1320]	174	! ONLY-attribute added to USE-statements,
	175	! kind-parameters added to all INTEGER and REAL declaration statements,
	176	! kinds are defined in new module kinds,
	177	! revision history before 2012 removed,
	178	! comment fields (!:) to be used for variable explanations added to
	179	! all variable declaration statements
[760]	180	!
[1305]	181	! 1304 2014-03-12 10:29:42Z raasch
	182	! bugfix: single core MPI runs missed some settings of transpose indices
	183	!
[1213]	184	! 1212 2013-08-15 08:46:27Z raasch
	185	! error message for poisfft_hybrid removed
	186	!
[1160]	187	! 1159 2013-05-21 11:58:22Z fricke
	188	! dirichlet/neumann and neumann/dirichlet removed
	189	!
[1140]	190	! 1139 2013-04-18 07:25:03Z raasch
	191	! bugfix for calculating the id of the PE carrying the recycling plane
	192	!
[1112]	193	! 1111 2013-03-08 23:54:10Z raasch
	194	! initialization of poisfft moved to module poisfft
	195	!
[1093]	196	! 1092 2013-02-02 11:24:22Z raasch
	197	! unused variables removed
	198	!
[1057]	199	! 1056 2012-11-16 15:28:04Z raasch
	200	! Indices for arrays n.._mg start from zero due to definition of arrays f2 and
	201	! p2 as automatic arrays in recursive subroutine next_mg_level
	202	!
[1042]	203	! 1041 2012-11-06 02:36:29Z raasch
	204	! a 2d virtual processor topology is used by default for all machines
	205	!
[1037]	206	! 1036 2012-10-22 13:43:42Z raasch
	207	! code put under GPL (PALM 3.9)
	208	!
[1004]	209	! 1003 2012-09-14 14:35:53Z raasch
	210	! subdomains must have identical size (grid matching = "match" removed)
	211	!
[1002]	212	! 1001 2012-09-13 14:08:46Z raasch
	213	! all actions concerning upstream-spline-method removed
	214	!
[979]	215	! 978 2012-08-09 08:28:32Z fricke
	216	! dirichlet/neumann and neumann/dirichlet added
	217	! nxlu and nysv are also calculated for inflow boundary
	218	!
[810]	219	! 809 2012-01-30 13:32:58Z maronga
	220	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	221	!
[808]	222	! 807 2012-01-25 11:53:51Z maronga
	223	! New cpp directive "__check" implemented which is used by check_namelist_files
	224	!
[1]	225	! Revision 1.1 1997/07/24 11:15:09 raasch
	226	! Initial revision
	227	!
	228	!
	229	! Description:
	230	! ------------
[1682]	231	!> Determination of the virtual processor topology (if not prescribed by the
	232	!> user)and computation of the grid point number and array bounds of the local
	233	!> domains.
[2696]	234	!> @todo: remove MPI-data types for 2D exchange on coarse multigrid level (not
	235	!> used any more)
[1]	236	!------------------------------------------------------------------------------!
[1682]	237	SUBROUTINE init_pegrid
	238
[1]	239
[1320]	240	USE control_parameters, &
[1435]	241	ONLY: bc_lr, bc_ns, coupling_mode, coupling_mode_remote, &
[2696]	242	coupling_topology, force_bound_l, force_bound_n, force_bound_r, &
	243	force_bound_s, gathered_size, grid_level, &
[2300]	244	grid_level_count, inflow_l, inflow_n, inflow_r, inflow_s, &
[2600]	245	maximum_grid_level, message_string, &
[1762]	246	mg_switch_to_pe0_level, momentum_advec, nest_bound_l, &
[1933]	247	nest_bound_n, nest_bound_r, nest_bound_s, nest_domain, neutral, &
	248	psolver, outflow_l, outflow_n, outflow_r, outflow_s, &
[2050]	249	outflow_source_plane, recycling_width, scalar_advec, &
[2372]	250	subdomain_size, turbulent_outflow, y_shift
[1]	251
[1320]	252	USE grid_variables, &
	253	ONLY: dx
	254
	255	USE indices, &
	256	ONLY: mg_loc_ind, nbgp, nnx, nny, nnz, nx, nx_a, nx_o, nxl, nxl_mg, &
	257	nxlu, nxr, nxr_mg, ny, ny_a, ny_o, nyn, nyn_mg, nys, nys_mg, &
	258	nysv, nz, nzb, nzt, nzt_mg, wall_flags_1, wall_flags_2, &
	259	wall_flags_3, wall_flags_4, wall_flags_5, wall_flags_6, &
	260	wall_flags_7, wall_flags_8, wall_flags_9, wall_flags_10
[1]	261
[1320]	262	USE kinds
	263
	264	USE pegrid
[2238]	265
[1833]	266	USE spectra_mod, &
[1922]	267	ONLY: calculate_spectra, dt_dosp
[1833]	268
[2259]	269	USE synthetic_turbulence_generator_mod, &
[2938]	270	ONLY: id_stg_left, id_stg_north, id_stg_right, id_stg_south, &
	271	use_syn_turb_gen
[2259]	272
[1320]	273	USE transpose_indices, &
	274	ONLY: nxl_y, nxl_yd, nxl_z, nxr_y, nxr_yd, nxr_z, nyn_x, nyn_z, nys_x,&
	275	nys_z, nzb_x, nzb_y, nzb_yd, nzt_x, nzt_yd, nzt_y
[667]	276
[2365]	277	USE vertical_nesting_mod, &
	278	ONLY: vnested, vnest_init_pegrid_domain, vnest_init_pegrid_rank
	279
[1]	280	IMPLICIT NONE
	281
[1682]	282	INTEGER(iwp) :: i !<
	283	INTEGER(iwp) :: id_inflow_l !<
[2050]	284	INTEGER(iwp) :: id_outflow_l !< local value of id_outflow
	285	INTEGER(iwp) :: id_outflow_source_l !< local value of id_outflow_source
[1682]	286	INTEGER(iwp) :: id_recycling_l !<
[2938]	287	INTEGER(iwp) :: id_stg_left_l !< left lateral boundary local core id in case of turbulence generator
	288	INTEGER(iwp) :: id_stg_north_l !< north lateral boundary local core id in case of turbulence generator
	289	INTEGER(iwp) :: id_stg_right_l !< right lateral boundary local core id in case of turbulence generator
	290	INTEGER(iwp) :: id_stg_south_l !< south lateral boundary local core id in case of turbulence generator
[1682]	291	INTEGER(iwp) :: ind(5) !<
	292	INTEGER(iwp) :: j !<
	293	INTEGER(iwp) :: k !<
	294	INTEGER(iwp) :: maximum_grid_level_l !<
	295	INTEGER(iwp) :: mg_levels_x !<
	296	INTEGER(iwp) :: mg_levels_y !<
	297	INTEGER(iwp) :: mg_levels_z !<
	298	INTEGER(iwp) :: mg_switch_to_pe0_level_l !<
	299	INTEGER(iwp) :: nnx_y !<
	300	INTEGER(iwp) :: nnx_z !<
	301	INTEGER(iwp) :: nny_x !<
	302	INTEGER(iwp) :: nny_z !<
	303	INTEGER(iwp) :: nnz_x !<
	304	INTEGER(iwp) :: nnz_y !<
	305	INTEGER(iwp) :: numproc_sqr !<
	306	INTEGER(iwp) :: nxl_l !<
	307	INTEGER(iwp) :: nxr_l !<
	308	INTEGER(iwp) :: nyn_l !<
	309	INTEGER(iwp) :: nys_l !<
	310	INTEGER(iwp) :: nzb_l !<
	311	INTEGER(iwp) :: nzt_l !<
	312	INTEGER(iwp) :: omp_get_num_threads !<
[1]	313
[1682]	314	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ind_all !<
	315	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxlf !<
	316	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nxrf !<
	317	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nynf !<
	318	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nysf !<
[1]	319
[2372]	320	INTEGER(iwp), DIMENSION(2) :: pdims_remote !<
	321	INTEGER(iwp) :: lcoord(2) !< PE coordinates of left neighbor along x and y
	322	INTEGER(iwp) :: rcoord(2) !< PE coordinates of right neighbor along x and y
[667]	323
[1]	324	!
	325	!-- Get the number of OpenMP threads
	326	!$OMP PARALLEL
	327	!$ threads_per_task = omp_get_num_threads()
	328	!$OMP END PARALLEL
	329
	330
	331	#if defined( __parallel )
[667]	332
[1402]	333	CALL location_message( 'creating virtual PE grids + MPI derived data types', &
	334	.FALSE. )
[1764]	335
[1]	336	!
[2177]	337	!-- Determine the processor topology or check it, if prescribed by the user
[1779]	338	IF ( npex == -1 .AND. npey == -1 ) THEN
[1]	339
	340	!
[2177]	341	!-- Automatic determination of the topology
[1779]	342	numproc_sqr = SQRT( REAL( numprocs, KIND=wp ) )
	343	pdims(1) = MAX( numproc_sqr , 1 )
[2180]	344	DO WHILE ( MOD( numprocs , pdims(1) ) /= 0 )
[1779]	345	pdims(1) = pdims(1) - 1
	346	ENDDO
[2180]	347	pdims(2) = numprocs / pdims(1)
[1]	348
[1779]	349	ELSEIF ( npex /= -1 .AND. npey /= -1 ) THEN
[1]	350
	351	!
[1779]	352	!-- Prescribed by user. Number of processors on the prescribed topology
	353	!-- must be equal to the number of PEs available to the job
	354	IF ( ( npex * npey ) /= numprocs ) THEN
[3045]	355	WRITE( message_string, * ) 'number of PEs of the prescribed ', &
[3046]	356	'topology (', npex*npey,') does not match & the number of ', &
[1779]	357	'PEs available to the job (', numprocs, ')'
	358	CALL message( 'init_pegrid', 'PA0221', 1, 2, 0, 6, 0 )
	359	ENDIF
	360	pdims(1) = npex
	361	pdims(2) = npey
[1]	362
[1779]	363	ELSE
[1]	364	!
[1779]	365	!-- If the processor topology is prescribed by the user, the number of
	366	!-- PEs must be given in both directions
[3045]	367	message_string = 'if the processor topology is prescribed by th' // &
[3046]	368	'e user & both values of "npex" and "npey" must be given' // &
[1779]	369	' in the &NAMELIST-parameter file'
	370	CALL message( 'init_pegrid', 'PA0222', 1, 2, 0, 6, 0 )
[1]	371
	372	ENDIF
	373
	374	!
	375	!-- If necessary, set horizontal boundary conditions to non-cyclic
[722]	376	IF ( bc_lr /= 'cyclic' ) cyclic(1) = .FALSE.
	377	IF ( bc_ns /= 'cyclic' ) cyclic(2) = .FALSE.
[1]	378
[807]	379
[1]	380	!
	381	!-- Create the virtual processor grid
	382	CALL MPI_CART_CREATE( comm_palm, ndim, pdims, cyclic, reorder, &
	383	comm2d, ierr )
	384	CALL MPI_COMM_RANK( comm2d, myid, ierr )
[1468]	385	WRITE (myid_char,'(''_'',I6.6)') myid
[1]	386
	387	CALL MPI_CART_COORDS( comm2d, myid, ndim, pcoord, ierr )
	388	CALL MPI_CART_SHIFT( comm2d, 0, 1, pleft, pright, ierr )
	389	CALL MPI_CART_SHIFT( comm2d, 1, 1, psouth, pnorth, ierr )
	390	!
[2372]	391	!-- In case of cyclic boundary conditions, a y-shift at the boundaries in
	392	!-- x-direction can be introduced via parameter y_shift. The shift is done
	393	!-- by modifying the processor grid in such a way that processors located
	394	!-- at the x-boundary communicate across it to processors with y-coordinate
	395	!-- shifted by y_shift relative to their own. This feature can not be used
	396	!-- in combination with an fft pressure solver. It has been implemented to
	397	!-- counter the effect of streak structures in case of cyclic boundary
	398	!-- conditions. For a description of these see Munters
	399	!-- (2016; dx.doi.org/10.1063/1.4941912)
	400	!--
	401	!-- Get coordinates of left and right neighbor on PE grid
	402	IF ( y_shift /= 0 ) THEN
	403
	404	IF ( bc_lr /= 'cyclic' .OR. bc_ns /= 'cyclic' ) THEN
	405	message_string = 'y_shift /= 0 is only allowed for cyclic ' // &
	406	'boundary conditions in both directions '
	407	CALL message( 'check_parameters', 'PA0467', 1, 2, 0, 6, 0 )
	408	ENDIF
	409	IF ( TRIM( psolver ) /= 'multigrid' .AND. &
	410	TRIM( psolver ) /= 'multigrid_noopt') &
	411	THEN
	412	message_string = 'y_shift /= 0 requires a multigrid pressure solver '
	413	CALL message( 'check_parameters', 'PA0468', 1, 2, 0, 6, 0 )
	414	ENDIF
	415
	416	CALL MPI_CART_COORDS( comm2d, pright, ndim, rcoord, ierr )
	417	CALL MPI_CART_COORDS( comm2d, pleft, ndim, lcoord, ierr )
	418
	419	!
	420	!-- If the x(y)-coordinate of the right (left) neighbor is smaller (greater)
	421	!-- than that of the calling process, then the calling process is located on
	422	!-- the right (left) boundary of the processor grid. In that case,
	423	!-- the y-coordinate of that neighbor is increased (decreased) by y_shift.
	424	!-- The rank of the process with that coordinate is then inquired and the
	425	!-- neighbor rank for MPI_SENDRECV, pright (pleft) is set to it.
	426	!-- In this way, the calling process receives a new right (left) neighbor
	427	!-- for all future MPI_SENDRECV calls. That neighbor has a y-coordinate
	428	!-- of y+(-)y_shift, where y is the original right (left) neighbor's
	429	!-- y-coordinate. The modulo-operation ensures that if the neighbor's
	430	!-- y-coordinate exceeds the grid-boundary, it will be relocated to
	431	!-- the opposite part of the grid cyclicly.
	432	IF ( rcoord(1) < pcoord(1) ) THEN
	433	rcoord(2) = MODULO( rcoord(2) + y_shift, pdims(2) )
	434	CALL MPI_CART_RANK( comm2d, rcoord, pright, ierr )
	435	ENDIF
	436
	437	IF ( lcoord(1) > pcoord(1) ) THEN
	438	lcoord(2) = MODULO( lcoord(2) - y_shift, pdims(2) )
	439	CALL MPI_CART_RANK( comm2d, lcoord, pleft, ierr )
	440	ENDIF
	441	ENDIF
	442	!
[2365]	443	!-- Vertical nesting: store four lists that identify partner ranks to exchange
	444	!-- data
	445	IF ( vnested ) CALL vnest_init_pegrid_rank
	446
	447	!
[1]	448	!-- Determine sub-topologies for transpositions
	449	!-- Transposition from z to x:
	450	remain_dims(1) = .TRUE.
	451	remain_dims(2) = .FALSE.
	452	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dx, ierr )
	453	CALL MPI_COMM_RANK( comm1dx, myidx, ierr )
	454	!
	455	!-- Transposition from x to y
	456	remain_dims(1) = .FALSE.
	457	remain_dims(2) = .TRUE.
	458	CALL MPI_CART_SUB( comm2d, remain_dims, comm1dy, ierr )
	459	CALL MPI_COMM_RANK( comm1dy, myidy, ierr )
	460
	461
	462	!
[1003]	463	!-- Calculate array bounds along x-direction for every PE.
[3045]	464	ALLOCATE( nxlf(0:pdims(1)-1), nxrf(0:pdims(1)-1), nynf(0:pdims(2)-1), &
[1003]	465	nysf(0:pdims(2)-1) )
[1]	466
[1003]	467	IF ( MOD( nx+1 , pdims(1) ) /= 0 ) THEN
[3045]	468	WRITE( message_string, * ) 'x-direction: gridpoint number (',nx+1,') ', &
[3046]	469	'is not an& integral divisor of the number ', &
[3045]	470	'of processors (', pdims(1),')'
[254]	471	CALL message( 'init_pegrid', 'PA0225', 1, 2, 0, 6, 0 )
[1]	472	ELSE
[1003]	473	nnx = ( nx + 1 ) / pdims(1)
[1]	474	ENDIF
	475
	476	!
	477	!-- Left and right array bounds, number of gridpoints
	478	DO i = 0, pdims(1)-1
	479	nxlf(i) = i * nnx
	480	nxrf(i) = ( i + 1 ) * nnx - 1
	481	ENDDO
	482
	483	!
	484	!-- Calculate array bounds in y-direction for every PE.
[1003]	485	IF ( MOD( ny+1 , pdims(2) ) /= 0 ) THEN
[274]	486	WRITE( message_string, * ) 'y-direction: gridpoint number (',ny+1,') ', &
[3046]	487	'is not an& integral divisor of the number of', &
[274]	488	'processors (', pdims(2),')'
[254]	489	CALL message( 'init_pegrid', 'PA0227', 1, 2, 0, 6, 0 )
[1]	490	ELSE
[1003]	491	nny = ( ny + 1 ) / pdims(2)
[1]	492	ENDIF
	493
	494	!
	495	!-- South and north array bounds
	496	DO j = 0, pdims(2)-1
	497	nysf(j) = j * nny
	498	nynf(j) = ( j + 1 ) * nny - 1
	499	ENDDO
	500
	501	!
	502	!-- Local array bounds of the respective PEs
[1003]	503	nxl = nxlf(pcoord(1))
	504	nxr = nxrf(pcoord(1))
	505	nys = nysf(pcoord(2))
	506	nyn = nynf(pcoord(2))
	507	nzb = 0
	508	nzt = nz
	509	nnz = nz
[1]	510
	511	!
[707]	512	!-- Set switches to define if the PE is situated at the border of the virtual
	513	!-- processor grid
	514	IF ( nxl == 0 ) left_border_pe = .TRUE.
	515	IF ( nxr == nx ) right_border_pe = .TRUE.
	516	IF ( nys == 0 ) south_border_pe = .TRUE.
	517	IF ( nyn == ny ) north_border_pe = .TRUE.
	518
	519	!
[1]	520	!-- Calculate array bounds and gridpoint numbers for the transposed arrays
	521	!-- (needed in the pressure solver)
	522	!-- For the transposed arrays, cyclic boundaries as well as top and bottom
	523	!-- boundaries are omitted, because they are obstructive to the transposition
	524
	525	!
	526	!-- 1. transposition z --> x
[1001]	527	!-- This transposition is not neccessary in case of a 1d-decomposition along x
[2938]	528	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
[1304]	529
[1922]	530	IF ( pdims(2) /= 1 ) THEN
	531	IF ( MOD( nz , pdims(1) ) /= 0 ) THEN
	532	WRITE( message_string, * ) 'transposition z --> x:', &
[3046]	533	'& nz=',nz,' is not an integral divisior of pdims(1)=', &
[274]	534	pdims(1)
[1922]	535	CALL message( 'init_pegrid', 'PA0230', 1, 2, 0, 6, 0 )
	536	ENDIF
[1]	537	ENDIF
[1922]	538
	539	nys_x = nys
	540	nyn_x = nyn
	541	nny_x = nny
	542	nnz_x = nz / pdims(1)
	543	nzb_x = 1 + myidx * nnz_x
	544	nzt_x = ( myidx + 1 ) * nnz_x
	545	sendrecvcount_zx = nnx * nny * nnz_x
	546
[1]	547	ENDIF
	548
[1922]	549
	550	IF ( psolver == 'poisfft' ) THEN
[1]	551	!
[1922]	552	!-- 2. transposition x --> y
	553	IF ( MOD( nx+1 , pdims(2) ) /= 0 ) THEN
	554	WRITE( message_string, * ) 'transposition x --> y:', &
[3046]	555	'& nx+1=',nx+1,' is not an integral divisor of ', &
[1922]	556	'pdims(2)=',pdims(2)
	557	CALL message( 'init_pegrid', 'PA0231', 1, 2, 0, 6, 0 )
	558	ENDIF
[1]	559
[1922]	560	nnz_y = nnz_x
	561	nzb_y = nzb_x
	562	nzt_y = nzt_x
	563	nnx_y = (nx+1) / pdims(2)
	564	nxl_y = myidy * nnx_y
	565	nxr_y = ( myidy + 1 ) * nnx_y - 1
	566	sendrecvcount_xy = nnx_y * nny_x * nnz_y
[1]	567	!
[1922]	568	!-- 3. transposition y --> z
	569	!-- (ELSE: x --> y in case of 1D-decomposition along x)
	570	nxl_z = nxl_y
	571	nxr_z = nxr_y
	572	nny_z = (ny+1) / pdims(1)
	573	nys_z = myidx * nny_z
	574	nyn_z = ( myidx + 1 ) * nny_z - 1
	575	sendrecvcount_yz = nnx_y * nny_z * nnz_y
[1304]	576
[1922]	577	IF ( pdims(2) /= 1 ) THEN
[1]	578	!
[1922]	579	!-- y --> z
	580	!-- This transposition is not neccessary in case of a 1d-decomposition
	581	!-- along x, except that the uptream-spline method is switched on
	582	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
	583	WRITE( message_string, * ) 'transposition y --> z:', &
[3046]	584	'& ny+1=',ny+1,' is not an integral divisor of',&
[1922]	585	' pdims(1)=',pdims(1)
	586	CALL message( 'init_pegrid', 'PA0232', 1, 2, 0, 6, 0 )
	587	ENDIF
[1]	588
[1922]	589	ELSE
[1]	590	!
[1922]	591	!-- x --> y
	592	!-- This condition must be fulfilled for a 1D-decomposition along x
	593	IF ( MOD( ny+1 , pdims(1) ) /= 0 ) THEN
	594	WRITE( message_string, * ) 'transposition x --> y:', &
[3046]	595	'& ny+1=',ny+1,' is not an integral divisor of',&
[1922]	596	' pdims(1)=',pdims(1)
	597	CALL message( 'init_pegrid', 'PA0233', 1, 2, 0, 6, 0 )
	598	ENDIF
	599
[1]	600	ENDIF
	601
	602	ENDIF
	603
	604	!
	605	!-- Indices for direct transpositions z --> y (used for calculating spectra)
[1922]	606	IF ( calculate_spectra ) THEN
[1003]	607	IF ( MOD( nz, pdims(2) ) /= 0 ) THEN
[1922]	608	WRITE( message_string, * ) 'direct transposition z --> y (needed ', &
[3045]	609	'for spectra): nz=',nz,' is not an integral divisor of ', &
[274]	610	'pdims(2)=',pdims(2)
[254]	611	CALL message( 'init_pegrid', 'PA0234', 1, 2, 0, 6, 0 )
[1]	612	ELSE
[1003]	613	nxl_yd = nxl
	614	nxr_yd = nxr
	615	nzb_yd = 1 + myidy * ( nz / pdims(2) )
	616	nzt_yd = ( myidy + 1 ) * ( nz / pdims(2) )
	617	sendrecvcount_zyd = nnx * nny * ( nz / pdims(2) )
[1]	618	ENDIF
	619	ENDIF
	620
[1922]	621	IF ( psolver == 'poisfft' .OR. calculate_spectra ) THEN
[1]	622	!
[1922]	623	!-- Indices for direct transpositions y --> x
	624	!-- (they are only possible in case of a 1d-decomposition along x)
	625	IF ( pdims(2) == 1 ) THEN
	626	nny_x = nny / pdims(1)
	627	nys_x = myid * nny_x
	628	nyn_x = ( myid + 1 ) * nny_x - 1
	629	nzb_x = 1
	630	nzt_x = nz
	631	sendrecvcount_xy = nnx * nny_x * nz
	632	ENDIF
	633
[1]	634	ENDIF
	635
[1922]	636	IF ( psolver == 'poisfft' ) THEN
[1]	637	!
[1922]	638	!-- Indices for direct transpositions x --> y
	639	!-- (they are only possible in case of a 1d-decomposition along y)
	640	IF ( pdims(1) == 1 ) THEN
	641	nnx_y = nnx / pdims(2)
	642	nxl_y = myid * nnx_y
	643	nxr_y = ( myid + 1 ) * nnx_y - 1
	644	nzb_y = 1
	645	nzt_y = nz
	646	sendrecvcount_xy = nnx_y * nny * nz
	647	ENDIF
	648
[1]	649	ENDIF
	650
	651	!
	652	!-- Arrays for storing the array bounds are needed any more
	653	DEALLOCATE( nxlf , nxrf , nynf , nysf )
	654
[807]	655
[145]	656	!
	657	!-- Collect index bounds from other PEs (to be written to restart file later)
	658	ALLOCATE( hor_index_bounds(4,0:numprocs-1) )
	659
	660	IF ( myid == 0 ) THEN
	661
	662	hor_index_bounds(1,0) = nxl
	663	hor_index_bounds(2,0) = nxr
	664	hor_index_bounds(3,0) = nys
	665	hor_index_bounds(4,0) = nyn
	666
	667	!
	668	!-- Receive data from all other PEs
	669	DO i = 1, numprocs-1
	670	CALL MPI_RECV( ibuf, 4, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
	671	ierr )
	672	hor_index_bounds(:,i) = ibuf(1:4)
	673	ENDDO
	674
	675	ELSE
	676	!
	677	!-- Send index bounds to PE0
	678	ibuf(1) = nxl
	679	ibuf(2) = nxr
	680	ibuf(3) = nys
	681	ibuf(4) = nyn
	682	CALL MPI_SEND( ibuf, 4, MPI_INTEGER, 0, myid, comm2d, ierr )
	683
	684	ENDIF
	685
[807]	686
[1]	687	#if defined( __print )
	688	!
	689	!-- Control output
	690	IF ( myid == 0 ) THEN
	691	PRINT, ' processor topology *'
	692	PRINT*, ' '
	693	PRINT*, 'myid pcoord left right south north idx idy nxl: nxr',&
	694	&' nys: nyn'
	695	PRINT*, '------------------------------------------------------------',&
	696	&'-----------'
	697	WRITE (*,1000) 0, pcoord(1), pcoord(2), pleft, pright, psouth, pnorth, &
	698	myidx, myidy, nxl, nxr, nys, nyn
	699	1000 FORMAT (I4,2X,'(',I3,',',I3,')',3X,I4,2X,I4,3X,I4,2X,I4,2X,I3,1X,I3, &
	700	2(2X,I4,':',I4))
	701
	702	!
[108]	703	!-- Receive data from the other PEs
[1]	704	DO i = 1,numprocs-1
	705	CALL MPI_RECV( ibuf, 12, MPI_INTEGER, i, MPI_ANY_TAG, comm2d, status, &
	706	ierr )
	707	WRITE (*,1000) i, ( ibuf(j) , j = 1,12 )
	708	ENDDO
	709	ELSE
	710
	711	!
	712	!-- Send data to PE0
	713	ibuf(1) = pcoord(1); ibuf(2) = pcoord(2); ibuf(3) = pleft
	714	ibuf(4) = pright; ibuf(5) = psouth; ibuf(6) = pnorth; ibuf(7) = myidx
	715	ibuf(8) = myidy; ibuf(9) = nxl; ibuf(10) = nxr; ibuf(11) = nys
	716	ibuf(12) = nyn
	717	CALL MPI_SEND( ibuf, 12, MPI_INTEGER, 0, myid, comm2d, ierr )
	718	ENDIF
	719	#endif
	720
[667]	721	!
[709]	722	!-- Determine the number of ghost point layers
[1565]	723	IF ( ( scalar_advec == 'ws-scheme' .AND. .NOT. neutral ) .OR. &
[1557]	724	momentum_advec == 'ws-scheme' ) THEN
[667]	725	nbgp = 3
	726	ELSE
	727	nbgp = 1
[709]	728	ENDIF
[667]	729
[102]	730	!
[709]	731	!-- Create a new MPI derived datatype for the exchange of surface (xy) data,
	732	!-- which is needed for coupled atmosphere-ocean runs.
	733	!-- First, calculate number of grid points of an xy-plane.
[667]	734	ngp_xy = ( nxr - nxl + 1 + 2 * nbgp ) * ( nyn - nys + 1 + 2 * nbgp )
[102]	735	CALL MPI_TYPE_VECTOR( ngp_xy, 1, nzt-nzb+2, MPI_REAL, type_xy, ierr )
	736	CALL MPI_TYPE_COMMIT( type_xy, ierr )
[667]	737
[2365]	738	IF ( TRIM( coupling_mode ) /= 'uncoupled' .AND. .NOT. vnested ) THEN
[667]	739
	740	!
	741	!-- Pass the number of grid points of the atmosphere model to
	742	!-- the ocean model and vice versa
	743	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
	744
	745	nx_a = nx
	746	ny_a = ny
	747
[709]	748	IF ( myid == 0 ) THEN
	749
	750	CALL MPI_SEND( nx_a, 1, MPI_INTEGER, numprocs, 1, comm_inter, &
	751	ierr )
	752	CALL MPI_SEND( ny_a, 1, MPI_INTEGER, numprocs, 2, comm_inter, &
	753	ierr )
	754	CALL MPI_SEND( pdims, 2, MPI_INTEGER, numprocs, 3, comm_inter, &
	755	ierr )
	756	CALL MPI_RECV( nx_o, 1, MPI_INTEGER, numprocs, 4, comm_inter, &
	757	status, ierr )
	758	CALL MPI_RECV( ny_o, 1, MPI_INTEGER, numprocs, 5, comm_inter, &
	759	status, ierr )
	760	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, numprocs, 6, &
[667]	761	comm_inter, status, ierr )
	762	ENDIF
	763
[709]	764	CALL MPI_BCAST( nx_o, 1, MPI_INTEGER, 0, comm2d, ierr )
	765	CALL MPI_BCAST( ny_o, 1, MPI_INTEGER, 0, comm2d, ierr )
	766	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr )
[667]	767
	768	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	769
	770	nx_o = nx
	771	ny_o = ny
	772
	773	IF ( myid == 0 ) THEN
[709]	774
	775	CALL MPI_RECV( nx_a, 1, MPI_INTEGER, 0, 1, comm_inter, status, &
	776	ierr )
	777	CALL MPI_RECV( ny_a, 1, MPI_INTEGER, 0, 2, comm_inter, status, &
	778	ierr )
	779	CALL MPI_RECV( pdims_remote, 2, MPI_INTEGER, 0, 3, comm_inter, &
	780	status, ierr )
	781	CALL MPI_SEND( nx_o, 1, MPI_INTEGER, 0, 4, comm_inter, ierr )
	782	CALL MPI_SEND( ny_o, 1, MPI_INTEGER, 0, 5, comm_inter, ierr )
	783	CALL MPI_SEND( pdims, 2, MPI_INTEGER, 0, 6, comm_inter, ierr )
[667]	784	ENDIF
	785
	786	CALL MPI_BCAST( nx_a, 1, MPI_INTEGER, 0, comm2d, ierr)
	787	CALL MPI_BCAST( ny_a, 1, MPI_INTEGER, 0, comm2d, ierr)
	788	CALL MPI_BCAST( pdims_remote, 2, MPI_INTEGER, 0, comm2d, ierr)
	789
	790	ENDIF
	791
[709]	792	ngp_a = ( nx_a+1 + 2 * nbgp ) * ( ny_a+1 + 2 * nbgp )
	793	ngp_o = ( nx_o+1 + 2 * nbgp ) * ( ny_o+1 + 2 * nbgp )
[667]	794
	795	!
[709]	796	!-- Determine if the horizontal grid and the number of PEs in ocean and
	797	!-- atmosphere is same or not
	798	IF ( nx_o == nx_a .AND. ny_o == ny_a .AND. &
[667]	799	pdims(1) == pdims_remote(1) .AND. pdims(2) == pdims_remote(2) ) &
	800	THEN
	801	coupling_topology = 0
	802	ELSE
	803	coupling_topology = 1
	804	ENDIF
	805
	806	!
	807	!-- Determine the target PEs for the exchange between ocean and
	808	!-- atmosphere (comm2d)
[709]	809	IF ( coupling_topology == 0 ) THEN
	810	!
	811	!-- In case of identical topologies, every atmosphere PE has exactly one
	812	!-- ocean PE counterpart and vice versa
	813	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
[667]	814	target_id = myid + numprocs
	815	ELSE
	816	target_id = myid
	817	ENDIF
	818
	819	ELSE
	820	!
	821	!-- In case of nonequivalent topology in ocean and atmosphere only for
	822	!-- PE0 in ocean and PE0 in atmosphere a target_id is needed, since
[709]	823	!-- data echxchange between ocean and atmosphere will be done only
	824	!-- between these PEs.
	825	IF ( myid == 0 ) THEN
	826
	827	IF ( TRIM( coupling_mode ) == 'atmosphere_to_ocean' ) THEN
[667]	828	target_id = numprocs
	829	ELSE
	830	target_id = 0
	831	ENDIF
[709]	832
[667]	833	ENDIF
[709]	834
[667]	835	ENDIF
	836
	837	ENDIF
	838
[2365]	839	!
	840	!-- Store partner grid point co-ordinates as lists.
	841	!-- Create custom MPI vector datatypes for contiguous data transfer
	842	IF ( vnested ) CALL vnest_init_pegrid_domain
[667]	843
[1]	844	#else
	845
	846	!
	847	!-- Array bounds when running on a single PE (respectively a non-parallel
	848	!-- machine)
[1003]	849	nxl = 0
	850	nxr = nx
	851	nnx = nxr - nxl + 1
	852	nys = 0
	853	nyn = ny
	854	nny = nyn - nys + 1
	855	nzb = 0
	856	nzt = nz
	857	nnz = nz
[1]	858
[145]	859	ALLOCATE( hor_index_bounds(4,0:0) )
	860	hor_index_bounds(1,0) = nxl
	861	hor_index_bounds(2,0) = nxr
	862	hor_index_bounds(3,0) = nys
	863	hor_index_bounds(4,0) = nyn
	864
[1]	865	!
	866	!-- Array bounds for the pressure solver (in the parallel code, these bounds
	867	!-- are the ones for the transposed arrays)
[1003]	868	nys_x = nys
	869	nyn_x = nyn
	870	nzb_x = nzb + 1
	871	nzt_x = nzt
[1]	872
[1003]	873	nxl_y = nxl
	874	nxr_y = nxr
	875	nzb_y = nzb + 1
	876	nzt_y = nzt
[1]	877
[1003]	878	nxl_z = nxl
	879	nxr_z = nxr
	880	nys_z = nys
	881	nyn_z = nyn
[1]	882
	883	#endif
	884
	885	!
	886	!-- Calculate number of grid levels necessary for the multigrid poisson solver
	887	!-- as well as the gridpoint indices on each level
[1575]	888	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	889
	890	!
	891	!-- First calculate number of possible grid levels for the subdomains
	892	mg_levels_x = 1
	893	mg_levels_y = 1
	894	mg_levels_z = 1
	895
	896	i = nnx
	897	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
	898	i = i / 2
	899	mg_levels_x = mg_levels_x + 1
	900	ENDDO
	901
	902	j = nny
	903	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
	904	j = j / 2
	905	mg_levels_y = mg_levels_y + 1
	906	ENDDO
	907
[181]	908	k = nz ! do not use nnz because it might be > nz due to transposition
	909	! requirements
[1]	910	DO WHILE ( MOD( k, 2 ) == 0 .AND. k /= 2 )
	911	k = k / 2
	912	mg_levels_z = mg_levels_z + 1
	913	ENDDO
[2197]	914	!
	915	!-- The optimized MG-solver does not allow odd values for nz at the coarsest
	916	!-- grid level
	917	IF ( TRIM( psolver ) /= 'multigrid_noopt' ) THEN
	918	IF ( MOD( k, 2 ) /= 0 ) mg_levels_z = mg_levels_z - 1
[3057]	919	!
	920	!-- An odd value of nz does not work. The finest level must have an even
	921	!-- value.
	922	IF ( mg_levels_z == 0 ) THEN
	923	message_string = 'optimized multigrid method requires nz to be even'
[3058]	924	CALL message( 'init_pegrid', 'PA0495', 1, 2, 0, 6, 0 )
[3057]	925	ENDIF
[2197]	926	ENDIF
[1]	927
	928	maximum_grid_level = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
	929
	930	!
	931	!-- Find out, if the total domain allows more levels. These additional
[709]	932	!-- levels are identically processed on all PEs.
[197]	933	IF ( numprocs > 1 .AND. mg_switch_to_pe0_level /= -1 ) THEN
[709]	934
[1]	935	IF ( mg_levels_z > MIN( mg_levels_x, mg_levels_y ) ) THEN
[709]	936
[1]	937	mg_switch_to_pe0_level_l = maximum_grid_level
	938
	939	mg_levels_x = 1
	940	mg_levels_y = 1
	941
	942	i = nx+1
	943	DO WHILE ( MOD( i, 2 ) == 0 .AND. i /= 2 )
	944	i = i / 2
	945	mg_levels_x = mg_levels_x + 1
	946	ENDDO
	947
	948	j = ny+1
	949	DO WHILE ( MOD( j, 2 ) == 0 .AND. j /= 2 )
	950	j = j / 2
	951	mg_levels_y = mg_levels_y + 1
	952	ENDDO
	953
	954	maximum_grid_level_l = MIN( mg_levels_x, mg_levels_y, mg_levels_z )
	955
	956	IF ( maximum_grid_level_l > mg_switch_to_pe0_level_l ) THEN
	957	mg_switch_to_pe0_level_l = maximum_grid_level_l - &
	958	mg_switch_to_pe0_level_l + 1
	959	ELSE
	960	mg_switch_to_pe0_level_l = 0
	961	ENDIF
[709]	962
[1]	963	ELSE
[3057]	964
[1]	965	mg_switch_to_pe0_level_l = 0
	966	maximum_grid_level_l = maximum_grid_level
[709]	967
[1]	968	ENDIF
	969
	970	!
	971	!-- Use switch level calculated above only if it is not pre-defined
	972	!-- by user
	973	IF ( mg_switch_to_pe0_level == 0 ) THEN
	974	IF ( mg_switch_to_pe0_level_l /= 0 ) THEN
	975	mg_switch_to_pe0_level = mg_switch_to_pe0_level_l
	976	maximum_grid_level = maximum_grid_level_l
	977	ENDIF
	978
	979	ELSE
	980	!
	981	!-- Check pre-defined value and reset to default, if neccessary
[3045]	982	IF ( mg_switch_to_pe0_level < mg_switch_to_pe0_level_l .OR. &
[1]	983	mg_switch_to_pe0_level >= maximum_grid_level_l ) THEN
[3045]	984	message_string = 'mg_switch_to_pe0_level ' // &
[2271]	985	'out of range and reset to 0'
[254]	986	CALL message( 'init_pegrid', 'PA0235', 0, 1, 0, 6, 0 )
[1]	987	mg_switch_to_pe0_level = 0
	988	ELSE
	989	!
	990	!-- Use the largest number of possible levels anyway and recalculate
	991	!-- the switch level to this largest number of possible values
	992	maximum_grid_level = maximum_grid_level_l
	993
	994	ENDIF
[709]	995
[1]	996	ENDIF
	997
	998	ENDIF
	999
[1056]	1000	ALLOCATE( grid_level_count(maximum_grid_level), &
	1001	nxl_mg(0:maximum_grid_level), nxr_mg(0:maximum_grid_level), &
	1002	nyn_mg(0:maximum_grid_level), nys_mg(0:maximum_grid_level), &
	1003	nzt_mg(0:maximum_grid_level) )
[1]	1004
	1005	grid_level_count = 0
[1056]	1006	!
	1007	!-- Index zero required as dummy due to definition of arrays f2 and p2 in
	1008	!-- recursive subroutine next_mg_level
	1009	nxl_mg(0) = 0; nxr_mg(0) = 0; nyn_mg(0) = 0; nys_mg(0) = 0; nzt_mg(0) = 0
[778]	1010
[1]	1011	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzt_l = nzt
	1012
	1013	DO i = maximum_grid_level, 1 , -1
	1014
	1015	IF ( i == mg_switch_to_pe0_level ) THEN
[1804]	1016	#if defined( __parallel )
[1]	1017	!
	1018	!-- Save the grid size of the subdomain at the switch level, because
	1019	!-- it is needed in poismg.
	1020	ind(1) = nxl_l; ind(2) = nxr_l
	1021	ind(3) = nys_l; ind(4) = nyn_l
	1022	ind(5) = nzt_l
	1023	ALLOCATE( ind_all(5*numprocs), mg_loc_ind(5,0:numprocs-1) )
	1024	CALL MPI_ALLGATHER( ind, 5, MPI_INTEGER, ind_all, 5, &
	1025	MPI_INTEGER, comm2d, ierr )
	1026	DO j = 0, numprocs-1
	1027	DO k = 1, 5
	1028	mg_loc_ind(k,j) = ind_all(k+j*5)
	1029	ENDDO
	1030	ENDDO
	1031	DEALLOCATE( ind_all )
	1032	!
[709]	1033	!-- Calculate the grid size of the total domain
[1]	1034	nxr_l = ( nxr_l-nxl_l+1 ) * pdims(1) - 1
	1035	nxl_l = 0
	1036	nyn_l = ( nyn_l-nys_l+1 ) * pdims(2) - 1
	1037	nys_l = 0
	1038	!
	1039	!-- The size of this gathered array must not be larger than the
	1040	!-- array tend, which is used in the multigrid scheme as a temporary
[778]	1041	!-- array. Therefore the subdomain size of an PE is calculated and
	1042	!-- the size of the gathered grid. These values are used in
	1043	!-- routines pres and poismg
	1044	subdomain_size = ( nxr - nxl + 2 * nbgp + 1 ) * &
	1045	( nyn - nys + 2 * nbgp + 1 ) * ( nzt - nzb + 2 )
[3045]	1046	gathered_size = ( nxr_l - nxl_l + 3 ) * ( nyn_l - nys_l + 3 ) * &
[1]	1047	( nzt_l - nzb + 2 )
	1048
[1804]	1049	#else
[3045]	1050	message_string = 'multigrid gather/scatter impossible ' // &
[1]	1051	'in non parallel mode'
[254]	1052	CALL message( 'init_pegrid', 'PA0237', 1, 2, 0, 6, 0 )
[1]	1053	#endif
	1054	ENDIF
	1055
	1056	nxl_mg(i) = nxl_l
	1057	nxr_mg(i) = nxr_l
	1058	nys_mg(i) = nys_l
	1059	nyn_mg(i) = nyn_l
	1060	nzt_mg(i) = nzt_l
	1061
	1062	nxl_l = nxl_l / 2
	1063	nxr_l = nxr_l / 2
	1064	nys_l = nys_l / 2
	1065	nyn_l = nyn_l / 2
	1066	nzt_l = nzt_l / 2
[778]	1067
[1]	1068	ENDDO
	1069
[780]	1070	!
[3045]	1071	!-- Temporary problem: Currently calculation of maxerror in routine poismg crashes
[780]	1072	!-- if grid data are collected on PE0 already on the finest grid level.
	1073	!-- To be solved later.
	1074	IF ( maximum_grid_level == mg_switch_to_pe0_level ) THEN
	1075	message_string = 'grid coarsening on subdomain level cannot be performed'
	1076	CALL message( 'poismg', 'PA0236', 1, 2, 0, 6, 0 )
	1077	ENDIF
	1078
[1]	1079	ELSE
	1080
[667]	1081	maximum_grid_level = 0
[1]	1082
	1083	ENDIF
	1084
[722]	1085	!
	1086	!-- Default level 0 tells exchange_horiz that all ghost planes have to be
	1087	!-- exchanged. grid_level is adjusted in poismg, where only one ghost plane
	1088	!-- is required.
	1089	grid_level = 0
[1]	1090
[1804]	1091	#if defined( __parallel )
[1]	1092	!
	1093	!-- Gridpoint number for the exchange of ghost points (y-line for 2D-arrays)
[667]	1094	ngp_y = nyn - nys + 1 + 2 * nbgp
[1]	1095
	1096	!
[709]	1097	!-- Define new MPI derived datatypes for the exchange of ghost points in
	1098	!-- x- and y-direction for 2D-arrays (line)
[1968]	1099	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_REAL, type_x, &
[709]	1100	ierr )
[1]	1101	CALL MPI_TYPE_COMMIT( type_x, ierr )
	1102
[667]	1103	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_REAL, type_y, ierr )
	1104	CALL MPI_TYPE_COMMIT( type_y, ierr )
[1968]	1105	!
	1106	!-- Define new MPI derived datatypes for the exchange of ghost points in
	1107	!-- x- and y-direction for 2D-INTEGER arrays (line) - on normal grid
	1108	ALLOCATE( type_x_int(0:maximum_grid_level), &
	1109	type_y_int(0:maximum_grid_level) )
[667]	1110
[1968]	1111	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2*nbgp, nbgp, ngp_y, MPI_INTEGER, &
	1112	type_x_int(0), ierr )
	1113	CALL MPI_TYPE_COMMIT( type_x_int(0), ierr )
[667]	1114
[1968]	1115	CALL MPI_TYPE_VECTOR( nbgp, ngp_y, ngp_y, MPI_INTEGER, type_y_int(0), ierr )
	1116	CALL MPI_TYPE_COMMIT( type_y_int(0), ierr )
[1]	1117	!
	1118	!-- Calculate gridpoint numbers for the exchange of ghost points along x
	1119	!-- (yz-plane for 3D-arrays) and define MPI derived data type(s) for the
	1120	!-- exchange of ghost points in y-direction (xz-plane).
	1121	!-- Do these calculations for the model grid and (if necessary) also
	1122	!-- for the coarser grid levels used in the multigrid method
[2696]	1123	ALLOCATE ( ngp_xz(0:maximum_grid_level), &
	1124	ngp_xz_int(0:maximum_grid_level), &
	1125	ngp_yz(0:maximum_grid_level), &
	1126	ngp_yz_int(0:maximum_grid_level), &
	1127	type_xz(0:maximum_grid_level), &
	1128	type_xz_int(0:maximum_grid_level), &
	1129	type_yz(0:maximum_grid_level), &
	1130	type_yz_int(0:maximum_grid_level) )
[1]	1131
	1132	nxl_l = nxl; nxr_l = nxr; nys_l = nys; nyn_l = nyn; nzb_l = nzb; nzt_l = nzt
[709]	1133
[667]	1134	!
	1135	!-- Discern between the model grid, which needs nbgp ghost points and
	1136	!-- grid levels for the multigrid scheme. In the latter case only one
	1137	!-- ghost point is necessary.
[709]	1138	!-- First definition of MPI-datatypes for exchange of ghost layers on normal
[667]	1139	!-- grid. The following loop is needed for data exchange in poismg.f90.
	1140	!
	1141	!-- Determine number of grid points of yz-layer for exchange
	1142	ngp_yz(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
[709]	1143
[667]	1144	!
[709]	1145	!-- Define an MPI-datatype for the exchange of left/right boundaries.
	1146	!-- Although data are contiguous in physical memory (which does not
	1147	!-- necessarily require an MPI-derived datatype), the data exchange between
	1148	!-- left and right PE's using the MPI-derived type is 10% faster than without.
[667]	1149	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz(0), &
[709]	1150	MPI_REAL, type_xz(0), ierr )
[667]	1151	CALL MPI_TYPE_COMMIT( type_xz(0), ierr )
[1]	1152
[709]	1153	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz(0), ngp_yz(0), MPI_REAL, type_yz(0), &
	1154	ierr )
[667]	1155	CALL MPI_TYPE_COMMIT( type_yz(0), ierr )
[709]	1156
[667]	1157	!
[2696]	1158	!-- Define data types for exchange of 3D Integer arrays.
	1159	ngp_yz_int(0) = (nzt - nzb + 2) * (nyn - nys + 1 + 2 * nbgp)
	1160
	1161	CALL MPI_TYPE_VECTOR( nxr-nxl+1+2nbgp, nbgp(nzt-nzb+2), ngp_yz_int(0), &
	1162	MPI_INTEGER, type_xz_int(0), ierr )
	1163	CALL MPI_TYPE_COMMIT( type_xz_int(0), ierr )
	1164
	1165	CALL MPI_TYPE_VECTOR( nbgp, ngp_yz_int(0), ngp_yz_int(0), MPI_INTEGER, &
	1166	type_yz_int(0), ierr )
	1167	CALL MPI_TYPE_COMMIT( type_yz_int(0), ierr )
	1168
	1169	!
[709]	1170	!-- Definition of MPI-datatypes for multigrid method (coarser level grids)
[1575]	1171	IF ( psolver(1:9) == 'multigrid' ) THEN
[667]	1172	!
[709]	1173	!-- Definition of MPI-datatyoe as above, but only 1 ghost level is used
	1174	DO i = maximum_grid_level, 1 , -1
[1968]	1175	!
[2696]	1176	!-- For 3D-exchange on different multigrid level, one ghost point for
	1177	!-- REAL arrays, two ghost points for INTEGER arrays
[1575]	1178	ngp_xz(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
[667]	1179	ngp_yz(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
	1180
[2696]	1181	ngp_xz_int(i) = (nzt_l - nzb_l + 2) * (nxr_l - nxl_l + 3)
	1182	ngp_yz_int(i) = (nzt_l - nzb_l + 2) * (nyn_l - nys_l + 3)
	1183	!
	1184	!-- MPI data type for REAL arrays, for xz-layers
	1185	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz(i), &
[709]	1186	MPI_REAL, type_xz(i), ierr )
[667]	1187	CALL MPI_TYPE_COMMIT( type_xz(i), ierr )
[1]	1188
[2696]	1189	!
	1190	!-- MPI data type for INTEGER arrays, for xz-layers
	1191	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+3, nzt_l-nzb_l+2, ngp_yz_int(i), &
	1192	MPI_INTEGER, type_xz_int(i), ierr )
	1193	CALL MPI_TYPE_COMMIT( type_xz_int(i), ierr )
	1194
	1195	!
	1196	!-- MPI data type for REAL arrays, for yz-layers
[709]	1197	CALL MPI_TYPE_VECTOR( 1, ngp_yz(i), ngp_yz(i), MPI_REAL, type_yz(i), &
	1198	ierr )
[667]	1199	CALL MPI_TYPE_COMMIT( type_yz(i), ierr )
[2696]	1200	!
	1201	!-- MPI data type for INTEGER arrays, for yz-layers
	1202	CALL MPI_TYPE_VECTOR( 1, ngp_yz_int(i), ngp_yz_int(i), MPI_INTEGER, &
	1203	type_yz_int(i), ierr )
	1204	CALL MPI_TYPE_COMMIT( type_yz_int(i), ierr )
[667]	1205
[1968]	1206
	1207	!-- For 2D-exchange of INTEGER arrays on coarser grid level, where 2 ghost
	1208	!-- points need to be exchanged.
	1209	CALL MPI_TYPE_VECTOR( nxr_l-nxl_l+5, 2, nyn_l-nys_l+5, MPI_INTEGER, &
	1210	type_x_int(i), ierr )
	1211	CALL MPI_TYPE_COMMIT( type_x_int(i), ierr )
	1212
	1213
	1214	CALL MPI_TYPE_VECTOR( 2, nyn_l-nys_l+5, nyn_l-nys_l+5, MPI_INTEGER, &
	1215	type_y_int(i), ierr )
	1216	CALL MPI_TYPE_COMMIT( type_y_int(i), ierr )
	1217
[667]	1218	nxl_l = nxl_l / 2
	1219	nxr_l = nxr_l / 2
	1220	nys_l = nys_l / 2
	1221	nyn_l = nyn_l / 2
	1222	nzt_l = nzt_l / 2
[709]	1223
[667]	1224	ENDDO
[709]	1225
	1226	ENDIF
[1677]	1227
[1]	1228	#endif
	1229
[1804]	1230	#if defined( __parallel )
[1]	1231	!
[1933]	1232	!-- Setting of flags for inflow/outflow/nesting conditions.
[1964]	1233	IF ( pleft == MPI_PROC_NULL ) THEN
	1234	IF ( bc_lr == 'dirichlet/radiation' ) THEN
	1235	inflow_l = .TRUE.
	1236	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
	1237	outflow_l = .TRUE.
	1238	ELSEIF ( bc_lr == 'nested' ) THEN
[1762]	1239	nest_bound_l = .TRUE.
[2696]	1240	ELSEIF ( bc_lr == 'forcing' ) THEN
	1241	force_bound_l = .TRUE.
[1]	1242	ENDIF
	1243	ENDIF
[1933]	1244
[1964]	1245	IF ( pright == MPI_PROC_NULL ) THEN
	1246	IF ( bc_lr == 'dirichlet/radiation' ) THEN
	1247	outflow_r = .TRUE.
	1248	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
	1249	inflow_r = .TRUE.
	1250	ELSEIF ( bc_lr == 'nested' ) THEN
[1762]	1251	nest_bound_r = .TRUE.
[2696]	1252	ELSEIF ( bc_lr == 'forcing' ) THEN
	1253	force_bound_r = .TRUE.
[1]	1254	ENDIF
	1255	ENDIF
	1256
[1964]	1257	IF ( psouth == MPI_PROC_NULL ) THEN
	1258	IF ( bc_ns == 'dirichlet/radiation' ) THEN
	1259	outflow_s = .TRUE.
	1260	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
	1261	inflow_s = .TRUE.
	1262	ELSEIF ( bc_ns == 'nested' ) THEN
[1762]	1263	nest_bound_s = .TRUE.
[2696]	1264	ELSEIF ( bc_ns == 'forcing' ) THEN
	1265	force_bound_s = .TRUE.
[1]	1266	ENDIF
	1267	ENDIF
	1268
[1964]	1269	IF ( pnorth == MPI_PROC_NULL ) THEN
	1270	IF ( bc_ns == 'dirichlet/radiation' ) THEN
	1271	inflow_n = .TRUE.
	1272	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
	1273	outflow_n = .TRUE.
	1274	ELSEIF ( bc_ns == 'nested' ) THEN
[1762]	1275	nest_bound_n = .TRUE.
[2696]	1276	ELSEIF ( bc_ns == 'forcing' ) THEN
	1277	force_bound_n = .TRUE.
[1]	1278	ENDIF
	1279	ENDIF
[2938]	1280	!
	1281	!-- In case of synthetic turbulence geneartor determine ids.
	1282	!-- Please note, if no forcing or nesting is applied, the generator is applied
	1283	!-- only at the left lateral boundary.
	1284	IF ( use_syn_turb_gen ) THEN
	1285	IF ( force_bound_l .OR. nest_bound_l .OR. inflow_l ) THEN
	1286	id_stg_left_l = myidx
	1287	ELSE
	1288	id_stg_left_l = 0
	1289	ENDIF
	1290	IF ( force_bound_r .OR. nest_bound_r ) THEN
	1291	id_stg_right_l = myidx
	1292	ELSE
	1293	id_stg_right_l = 0
	1294	ENDIF
	1295	IF ( force_bound_s .OR. nest_bound_s ) THEN
	1296	id_stg_south_l = myidy
	1297	ELSE
	1298	id_stg_south_l = 0
	1299	ENDIF
	1300	IF ( force_bound_n .OR. nest_bound_n ) THEN
	1301	id_stg_north_l = myidy
	1302	ELSE
	1303	id_stg_north_l = 0
	1304	ENDIF
[1968]	1305
[2938]	1306	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	1307	CALL MPI_ALLREDUCE( id_stg_left_l, id_stg_left, 1, MPI_INTEGER, &
	1308	MPI_SUM, comm1dx, ierr )
	1309
	1310	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	1311	CALL MPI_ALLREDUCE( id_stg_right_l, id_stg_right, 1, MPI_INTEGER, &
	1312	MPI_SUM, comm1dx, ierr )
	1313
	1314	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	1315	CALL MPI_ALLREDUCE( id_stg_south_l, id_stg_south, 1, MPI_INTEGER, &
	1316	MPI_SUM, comm1dy, ierr )
	1317
	1318	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	1319	CALL MPI_ALLREDUCE( id_stg_north_l, id_stg_north, 1, MPI_INTEGER, &
	1320	MPI_SUM, comm1dy, ierr )
	1321
	1322	ENDIF
	1323
[151]	1324	!
	1325	!-- Broadcast the id of the inflow PE
	1326	IF ( inflow_l ) THEN
[163]	1327	id_inflow_l = myidx
[151]	1328	ELSE
	1329	id_inflow_l = 0
	1330	ENDIF
[622]	1331	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[151]	1332	CALL MPI_ALLREDUCE( id_inflow_l, id_inflow, 1, MPI_INTEGER, MPI_SUM, &
	1333	comm1dx, ierr )
	1334
[163]	1335	!
	1336	!-- Broadcast the id of the recycling plane
	1337	!-- WARNING: needs to be adjusted in case of inflows other than from left side!
[1139]	1338	IF ( NINT( recycling_width / dx ) >= nxl .AND. &
	1339	NINT( recycling_width / dx ) <= nxr ) THEN
[163]	1340	id_recycling_l = myidx
	1341	ELSE
	1342	id_recycling_l = 0
	1343	ENDIF
[622]	1344	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[163]	1345	CALL MPI_ALLREDUCE( id_recycling_l, id_recycling, 1, MPI_INTEGER, MPI_SUM, &
	1346	comm1dx, ierr )
	1347
[2050]	1348	!
	1349	!-- Broadcast the id of the outflow PE and outflow-source plane
	1350	IF ( turbulent_outflow ) THEN
	1351
	1352	IF ( outflow_r ) THEN
	1353	id_outflow_l = myidx
	1354	ELSE
	1355	id_outflow_l = 0
	1356	ENDIF
	1357	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	1358	CALL MPI_ALLREDUCE( id_outflow_l, id_outflow, 1, MPI_INTEGER, MPI_SUM, &
	1359	comm1dx, ierr )
	1360
	1361	IF ( NINT( outflow_source_plane / dx ) >= nxl .AND. &
	1362	NINT( outflow_source_plane / dx ) <= nxr ) THEN
	1363	id_outflow_source_l = myidx
	1364	ELSE
	1365	id_outflow_source_l = 0
	1366	ENDIF
	1367	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	1368	CALL MPI_ALLREDUCE( id_outflow_source_l, id_outflow_source, 1, &
	1369	MPI_INTEGER, MPI_SUM, comm1dx, ierr )
	1370
	1371	ENDIF
	1372
[1402]	1373	CALL location_message( 'finished', .TRUE. )
[1384]	1374
[1804]	1375	#else
[1159]	1376	IF ( bc_lr == 'dirichlet/radiation' ) THEN
[1]	1377	inflow_l = .TRUE.
	1378	outflow_r = .TRUE.
[1159]	1379	ELSEIF ( bc_lr == 'radiation/dirichlet' ) THEN
[1]	1380	outflow_l = .TRUE.
	1381	inflow_r = .TRUE.
	1382	ENDIF
	1383
[1159]	1384	IF ( bc_ns == 'dirichlet/radiation' ) THEN
[1]	1385	inflow_n = .TRUE.
	1386	outflow_s = .TRUE.
[1159]	1387	ELSEIF ( bc_ns == 'radiation/dirichlet' ) THEN
[1]	1388	outflow_n = .TRUE.
	1389	inflow_s = .TRUE.
	1390	ENDIF
	1391	#endif
[807]	1392
[106]	1393	!
[978]	1394	!-- At the inflow or outflow, u or v, respectively, have to be calculated for
	1395	!-- one more grid point.
[2696]	1396	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l .OR. force_bound_l ) THEN
[106]	1397	nxlu = nxl + 1
	1398	ELSE
	1399	nxlu = nxl
	1400	ENDIF
[2696]	1401	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s .OR. force_bound_s ) THEN
[106]	1402	nysv = nys + 1
	1403	ELSE
	1404	nysv = nys
	1405	ENDIF
[1]	1406
[114]	1407	!
	1408	!-- Allocate wall flag arrays used in the multigrid solver
[1575]	1409	IF ( psolver(1:9) == 'multigrid' ) THEN
[114]	1410
	1411	DO i = maximum_grid_level, 1, -1
	1412
	1413	SELECT CASE ( i )
	1414
	1415	CASE ( 1 )
	1416	ALLOCATE( wall_flags_1(nzb:nzt_mg(i)+1, &
	1417	nys_mg(i)-1:nyn_mg(i)+1, &
	1418	nxl_mg(i)-1:nxr_mg(i)+1) )
	1419
	1420	CASE ( 2 )
	1421	ALLOCATE( wall_flags_2(nzb:nzt_mg(i)+1, &
	1422	nys_mg(i)-1:nyn_mg(i)+1, &
	1423	nxl_mg(i)-1:nxr_mg(i)+1) )
	1424
	1425	CASE ( 3 )
	1426	ALLOCATE( wall_flags_3(nzb:nzt_mg(i)+1, &
	1427	nys_mg(i)-1:nyn_mg(i)+1, &
	1428	nxl_mg(i)-1:nxr_mg(i)+1) )
	1429
	1430	CASE ( 4 )
	1431	ALLOCATE( wall_flags_4(nzb:nzt_mg(i)+1, &
	1432	nys_mg(i)-1:nyn_mg(i)+1, &
	1433	nxl_mg(i)-1:nxr_mg(i)+1) )
	1434
	1435	CASE ( 5 )
	1436	ALLOCATE( wall_flags_5(nzb:nzt_mg(i)+1, &
	1437	nys_mg(i)-1:nyn_mg(i)+1, &
	1438	nxl_mg(i)-1:nxr_mg(i)+1) )
	1439
	1440	CASE ( 6 )
	1441	ALLOCATE( wall_flags_6(nzb:nzt_mg(i)+1, &
	1442	nys_mg(i)-1:nyn_mg(i)+1, &
	1443	nxl_mg(i)-1:nxr_mg(i)+1) )
	1444
	1445	CASE ( 7 )
	1446	ALLOCATE( wall_flags_7(nzb:nzt_mg(i)+1, &
	1447	nys_mg(i)-1:nyn_mg(i)+1, &
	1448	nxl_mg(i)-1:nxr_mg(i)+1) )
	1449
	1450	CASE ( 8 )
	1451	ALLOCATE( wall_flags_8(nzb:nzt_mg(i)+1, &
	1452	nys_mg(i)-1:nyn_mg(i)+1, &
	1453	nxl_mg(i)-1:nxr_mg(i)+1) )
	1454
	1455	CASE ( 9 )
	1456	ALLOCATE( wall_flags_9(nzb:nzt_mg(i)+1, &
	1457	nys_mg(i)-1:nyn_mg(i)+1, &
	1458	nxl_mg(i)-1:nxr_mg(i)+1) )
	1459
	1460	CASE ( 10 )
	1461	ALLOCATE( wall_flags_10(nzb:nzt_mg(i)+1, &
	1462	nys_mg(i)-1:nyn_mg(i)+1, &
	1463	nxl_mg(i)-1:nxr_mg(i)+1) )
	1464
	1465	CASE DEFAULT
[254]	1466	message_string = 'more than 10 multigrid levels'
	1467	CALL message( 'init_pegrid', 'PA0238', 1, 2, 0, 6, 0 )
[114]	1468
	1469	END SELECT
	1470
	1471	ENDDO
	1472
	1473	ENDIF
	1474
[1]	1475	END SUBROUTINE init_pegrid

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