source: palm/trunk/SOURCE/init_coupling.f90 @ 2365

Last change on this file since 2365 was 2365, checked in by kanani, 4 years ago

Vertical nesting implemented (SadiqHuq?)

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1!> @file init_coupling.f90
2!------------------------------------------------------------------------------!
3! This file is part of PALM.
4!
5! PALM is free software: you can redistribute it and/or modify it under the
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 1997-2017 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! ------------------
26! $Id: init_coupling.f90 2365 2017-08-21 14:59:59Z kanani $
27! Vertical nesting implemented (SadiqHuq)
28!
29! 2298 2017-06-29 09:28:18Z raasch
30! MPI2 coupling removed
31!
32! 2101 2017-01-05 16:42:31Z suehring
33!
34! 2000 2016-08-20 18:09:15Z knoop
35! Forced header and separation lines into 80 columns
36!
37! 1808 2016-04-05 19:44:00Z raasch
38! routine local_getenv replaced by standard FORTRAN routine
39!
40! 1682 2015-10-07 23:56:08Z knoop
41! Code annotations made doxygen readable
42!
43! 1320 2014-03-20 08:40:49Z raasch
44! ONLY-attribute added to USE-statements,
45! kind-parameters added to all INTEGER and REAL declaration statements,
46! kinds are defined in new module kinds,
47! revision history before 2012 removed,
48! comment fields (!:) to be used for variable explanations added to
49! all variable declaration statements
50!
51! 1036 2012-10-22 13:43:42Z raasch
52! code put under GPL (PALM 3.9)
53!
54! 222 2009-01-12 16:04:16Z letzel
55! Initial revision
56!
57! Description:
58! ------------
59!> Initializing coupling via MPI-1 or MPI-2 if the coupled version of PALM is
60!> called.
61!------------------------------------------------------------------------------!
62  SUBROUTINE init_coupling
63 
64
65    USE control_parameters,                                                    &
66        ONLY:  coupling_char, coupling_mode
67       
68    USE kinds
69   
70    USE pegrid
71
72    USE vertical_nesting_mod
73
74    IMPLICIT NONE
75
76!
77!-- Local variables
78    INTEGER(iwp) ::  i            !<
79    INTEGER(iwp) ::  inter_color  !<
80   
81    INTEGER(iwp), DIMENSION(:) ::  bc_data(0:3) = 0  !<
82
83!
84!-- Get information about the coupling mode from the environment variable
85!-- which has been set by the mpiexec command.
86!-- This method is currently not used because the mpiexec command is not
87!-- available on some machines
88!    CALL GET_ENVIRONMENT_VARIABLE( 'coupling_mode', coupling_mode, i )
89!    IF ( i == 0 )  coupling_mode = 'uncoupled'
90!    IF ( coupling_mode == 'ocean_to_atmosphere' )  coupling_char = '_O'
91
92!
93!-- Get information about the coupling mode from standard input (PE0 only) and
94!-- distribute it to the other PEs. Distribute PEs to 2 new communicators.
95!-- ATTENTION: numprocs will be reset according to the new communicators
96#if defined ( __parallel )
97
98    IF ( myid == 0 )  THEN
99       READ (*,*,ERR=10,END=10)  coupling_mode, bc_data(1), bc_data(2)
10010     CONTINUE
101       IF ( TRIM( coupling_mode ) == 'coupled_run' )  THEN
102          i = 1
103       ELSEIF ( TRIM( coupling_mode ) == 'vnested_twi' )  THEN
104          i = 9
105       ELSE
106          i = 0
107       ENDIF
108       bc_data(0) = i
109
110!
111!--    Check if '_O' has to be used as file extension in an uncoupled ocean
112!--    run. This is required, if this run shall be continued as a coupled run.
113       IF ( TRIM( coupling_mode ) == 'precursor_ocean' )  bc_data(3) = 1
114
115    ENDIF
116
117    CALL MPI_BCAST( bc_data(0), 4, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr )
118    i = bc_data(0)
119
120    IF ( i == 0 )  THEN
121       coupling_mode = 'uncoupled'
122!
123!--    In case of a precursor ocean run, an additional flag file is created.
124!--    This is necessary for data_output_2d_on_each_pe = .T.
125       IF ( bc_data(3) == 1 )  THEN
126          OPEN( 90, FILE='PRECURSOR_OCEAN', FORM='FORMATTED' )
127          WRITE ( 90, '(''TRUE'')' )
128          CLOSE ( 90 )
129       ENDIF
130    ELSEIF ( i == 9 )  THEN
131
132!
133!--    Set a flag to identify runs with vertical nesting
134       vnested = .TRUE.
135       
136       comm_inter = MPI_COMM_WORLD
137       
138!
139!--    Split the total available PE's into two groups
140!--    numprocs for Coarse and Fine Grid are specified via mrun argument -N
141       IF ( myid < bc_data(1) )  THEN
142          inter_color     = 0
143          numprocs        = bc_data(1)
144          coupling_mode   = 'vnested_crse'
145       ELSE
146          inter_color     = 1
147          numprocs        = bc_data(2)
148          coupling_mode   = 'vnested_fine'
149       ENDIF
150       
151       CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr )
152       comm2d = comm_palm
153       
154       OPEN( 90, FILE='VNESTING_PORT_OPENED', FORM='FORMATTED' )
155       WRITE ( 90, '(''TRUE'')' )
156       CLOSE ( 90 )
157     
158    ELSE
159       comm_inter = MPI_COMM_WORLD
160
161       IF ( myid < bc_data(1) ) THEN
162          inter_color     = 0
163          numprocs        = bc_data(1)
164          coupling_mode   = 'atmosphere_to_ocean'
165       ELSE
166          inter_color     = 1
167          numprocs        = bc_data(2)
168          coupling_mode   = 'ocean_to_atmosphere'
169       ENDIF
170
171       CALL MPI_COMM_SPLIT( MPI_COMM_WORLD, inter_color, 0, comm_palm, ierr )
172       comm2d = comm_palm
173
174!
175!--    Write a flag file for the ocean model and the other atmosphere
176!--    processes.
177       OPEN( 90, FILE='COUPLING_PORT_OPENED', FORM='FORMATTED' )
178       WRITE ( 90, '(''TRUE'')' )
179       CLOSE ( 90 )
180    ENDIF
181#endif
182
183!
184!-- In case of a precursor ocean run (followed by a coupled run), or a
185!-- coupled atmosphere-ocean run, set the file extension for the ocean files
186    IF ( TRIM( coupling_mode ) == 'ocean_to_atmosphere' .OR. bc_data(3) == 1 ) &
187    THEN
188       coupling_char = '_O'
189    ENDIF
190
191    IF (  TRIM( coupling_mode ) == 'vnested_fine' )  THEN
192!
193!-- Set file extension for vertical nesting
194       coupling_char = '_N'
195    ENDIF
196
197 END SUBROUTINE init_coupling
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