source: palm/trunk/SOURCE/init_coupling.f90 @ 4570

Last change on this file since 4570 was 4564, checked in by raasch, 4 years ago

Vertical nesting method of Huq et al. (2019) removed

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[1682]1!> @file init_coupling.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!
[4360]17! Copyright 1997-2020 Leibniz Universitaet Hannover
[2000]18!------------------------------------------------------------------------------!
[1036]19!
[484]20! Current revisions:
[206]21! -----------------
[2001]22!
23!
[1321]24! Former revisions:
25! ------------------
26! $Id: init_coupling.f90 4564 2020-06-12 14:03:36Z gronemeier $
[4564]27! Vertical nesting method of Huq et al. (2019) removed
28!
29! 4444 2020-03-05 15:59:50Z raasch
[4444]30! bugfix: cpp-directives for serial mode added
31!
32! 4360 2020-01-07 11:25:50Z suehring
[4182]33! Corrected "Former revisions" section
34!
35! 3655 2019-01-07 16:51:22Z knoop
[3232]36! references to mrun replaced by palmrun, and updated
[2716]37!
[4182]38! 222 2009-01-12 16:04:16Z letzel
39! Initial revision
40!
[206]41! Description:
42! ------------
[1682]43!> Initializing coupling via MPI-1 or MPI-2 if the coupled version of PALM is
44!> called.
[206]45!------------------------------------------------------------------------------!
[1682]46  SUBROUTINE init_coupling
47 
[206]48
[1320]49    USE control_parameters,                                                    &
50        ONLY:  coupling_char, coupling_mode
51       
52    USE kinds
53   
[206]54    USE pegrid
55
56    IMPLICIT NONE
57
58!
59!-- Local variables
[4444]60#if defined( __parallel )
[1682]61    INTEGER(iwp) ::  i            !<
62    INTEGER(iwp) ::  inter_color  !<
[4444]63#endif
[1320]64   
[1682]65    INTEGER(iwp), DIMENSION(:) ::  bc_data(0:3) = 0  !<
[206]66
67!
68!-- Get information about the coupling mode from the environment variable
69!-- which has been set by the mpiexec command.
70!-- This method is currently not used because the mpiexec command is not
71!-- available on some machines
[1808]72!    CALL GET_ENVIRONMENT_VARIABLE( 'coupling_mode', coupling_mode, i )
[206]73!    IF ( i == 0 )  coupling_mode = 'uncoupled'
74!    IF ( coupling_mode == 'ocean_to_atmosphere' )  coupling_char = '_O'
75
76!
77!-- Get information about the coupling mode from standard input (PE0 only) and
[2298]78!-- distribute it to the other PEs. Distribute PEs to 2 new communicators.
[206]79!-- ATTENTION: numprocs will be reset according to the new communicators
[222]80#if defined ( __parallel )
[667]81
[206]82    IF ( myid == 0 )  THEN
83       READ (*,*,ERR=10,END=10)  coupling_mode, bc_data(1), bc_data(2)
8410     CONTINUE
85       IF ( TRIM( coupling_mode ) == 'coupled_run' )  THEN
86          i = 1
87       ELSE
88          i = 0
89       ENDIF
[291]90       bc_data(0) = i
91
92!
93!--    Check if '_O' has to be used as file extension in an uncoupled ocean
94!--    run. This is required, if this run shall be continued as a coupled run.
95       IF ( TRIM( coupling_mode ) == 'precursor_ocean' )  bc_data(3) = 1
96
[206]97    ENDIF
98
[291]99    CALL MPI_BCAST( bc_data(0), 4, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr )
[206]100    i = bc_data(0)
101
[2365]102    IF ( i == 0 )  THEN
[206]103       coupling_mode = 'uncoupled'
[691]104!
105!--    In case of a precursor ocean run, an additional flag file is created.
106!--    This is necessary for data_output_2d_on_each_pe = .T.
107       IF ( bc_data(3) == 1 )  THEN
108          OPEN( 90, FILE='PRECURSOR_OCEAN', FORM='FORMATTED' )
109          WRITE ( 90, '(''TRUE'')' )
110          CLOSE ( 90 )
111       ENDIF
[206]112    ELSE
113       comm_inter = MPI_COMM_WORLD
114
115       IF ( myid < bc_data(1) ) THEN
[667]116          inter_color     = 0
117          numprocs        = bc_data(1)
118          coupling_mode   = 'atmosphere_to_ocean'
[206]119       ELSE
[667]120          inter_color     = 1
121          numprocs        = bc_data(2)
122          coupling_mode   = 'ocean_to_atmosphere'
[206]123       ENDIF
[667]124
[206]125       CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr )
126       comm2d = comm_palm
127
128!
129!--    Write a flag file for the ocean model and the other atmosphere
130!--    processes.
131       OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
132       WRITE ( 90, '(''TRUE'')' )
133       CLOSE ( 90 )
134    ENDIF
135#endif
136
[291]137!
138!-- In case of a precursor ocean run (followed by a coupled run), or a
139!-- coupled atmosphere-ocean run, set the file extension for the ocean files
140    IF ( TRIM( coupling_mode ) == 'ocean_to_atmosphere' .OR. bc_data(3) == 1 ) &
141    THEN
142       coupling_char = '_O'
143    ENDIF
[206]144
145 END SUBROUTINE init_coupling
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