source: palm/trunk/SOURCE/palm.f90 @ 102

Last change on this file since 102 was 102, checked in by raasch, 14 years ago

preliminary version for coupled runs

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1 PROGRAM palm
2
3!------------------------------------------------------------------------------!
4! Actual revisions:
5! -----------------
6! Get coupling mode from environment variable
7!
8! Former revisions:
9! -----------------
10! $Id: palm.f90 102 2007-07-27 09:09:17Z raasch $
11!
12! 75 2007-03-22 09:54:05Z raasch
13! __vtk directives removed, write_particles is called only in case of particle
14! advection switched on, open unit 9 for debug output,
15! setting of palm version moved from modules to here
16!
17! RCS Log replace by Id keyword, revision history cleaned up
18!
19! Revision 1.10  2006/08/04 14:53:12  raasch
20! Distibution of run description header removed, call of header moved behind
21! init_3d_model
22!
23! Revision 1.2  2001/01/25 07:15:06  raasch
24! Program name changed to PALM, module test_variables removed.
25! Initialization of dvrp logging as well as exit of dvrp moved to new
26! subroutines init_dvrp_logging and close_dvrp (file init_dvrp.f90)
27!
28! Revision 1.1  1997/07/24 11:23:35  raasch
29! Initial revision
30!
31!
32! Description:
33! ------------
34! Large-Eddy Simulation (LES) model for the convective boundary layer,
35! optimized for use on parallel machines (implementation realized using the
36! Message Passing Interface (MPI)). The model can also be run on vector machines
37! (less well optimized) and workstations. Versions for the different types of
38! machines are controlled via cpp-directives.
39! Model runs are only feasible using the ksh-script mrun.
40!------------------------------------------------------------------------------!
41
42
43    USE arrays_3d
44    USE constants
45    USE control_parameters
46    USE cpulog
47    USE dvrp_variables
48    USE grid_variables
49    USE indices
50    USE interfaces
51    USE model_1d
52    USE particle_attributes
53    USE pegrid
54    USE spectrum
55    USE statistics
56
57    IMPLICIT NONE
58
59!
60!-- Local variables
61    CHARACTER (LEN=9) ::  time_to_string
62    CHARACTER (LEN=1) ::  cdum
63    INTEGER           ::  i, run_description_header_i(80)
64
65    version = 'PALM 3.3a'
66
67#if defined( __parallel )
68!
69!-- MPI initialisation. comm2d is preliminary set, because
70!-- it will be defined in init_pegrid but is used before in cpu_log.
71    CALL MPI_INIT( ierr )
72    CALL MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr )
73    comm_palm = MPI_COMM_WORLD
74    comm2d    = MPI_COMM_WORLD
75#endif
76
77#if defined( __mpi2 )
78!
79!-- Get information about the coupling mode from the environment variable
80!-- which has been set by the mpiexec command
81    CALL local_getenv( 'coupling_mode', 13, coupling_mode, i )
82    IF ( i == 0 )  coupling_mode = 'uncoupled'
83    IF ( coupling_mode == 'ocean_to_atmosphere' )  coupling_char = '_O'
84#endif
85
86!
87!-- Initialize measuring of the CPU-time remaining to the run
88    CALL local_tremain_ini
89
90!
91!-- Start of total CPU time measuring.
92    CALL cpu_log( log_point(1), 'total', 'start' )
93    CALL cpu_log( log_point(2), 'initialisation', 'start' )
94
95!
96!-- Initialize dvrp logging. Also, one PE maybe split from the global
97!-- communicator for doing the dvrp output. In that case, the number of
98!-- PEs available for PALM is reduced by one and communicator comm_palm
99!-- is changed respectively.
100#if defined( __parallel )
101    CALL MPI_COMM_RANK( comm_palm, myid, ierr )
102#endif
103    CALL init_dvrp_logging
104
105!
106!-- Read control parameters from NAMELIST files and read environment-variables
107    CALL parin
108
109!
110!-- Determine processor topology and local array indices
111    CALL init_pegrid
112
113!
114!-- Open a file for debug output
115    OPEN( 9, FILE='DEBUG'//TRIM( coupling_char )//myid_char, FORM='FORMATTED' )
116
117#if defined( __mpi2 )
118!
119!-- TEST OUTPUT (TO BE REMOVED)
120    WRITE(9,*) '*** coupling_mode = "', TRIM( coupling_mode ), '"'
121    CALL LOCAL_FLUSH( 9 )
122    print*, '*** PE', myid, '  ', TRIM( coupling_mode )
123#endif
124
125!
126!-- Generate grid parameters
127    CALL init_grid
128
129!
130!-- Check control parameters and deduce further quantities
131    CALL check_parameters
132
133!
134!-- Initialize all necessary variables
135    CALL init_3d_model
136
137!
138!-- Output of program header
139    IF ( myid == 0 )  CALL header
140
141    CALL cpu_log( log_point(2), 'initialisation', 'stop' )
142
143!
144!-- Set start time in format hh:mm:ss
145    simulated_time_chr = time_to_string( simulated_time )
146
147!
148!-- If required, output of initial arrays
149    IF ( do2d_at_begin )  THEN
150       CALL data_output_2d( 'xy', 0 )
151       CALL data_output_2d( 'xz', 0 )
152       CALL data_output_2d( 'yz', 0 )
153    ENDIF
154    IF ( do3d_at_begin )  THEN
155       CALL data_output_3d( 0 )
156    ENDIF
157
158!
159!-- Integration of the model equations using the leap-frog scheme
160    CALL time_integration
161
162!
163!-- If required, write binary data for model continuation runs
164    IF ( write_binary(1:4) == 'true' )  CALL write_3d_binary
165
166!
167!-- If required, write binary particle data
168    IF ( particle_advection )  CALL write_particles
169
170!
171!-- If required, repeat output of header including the required CPU-time
172    IF ( myid == 0 )  CALL header
173
174!
175!-- If required, final user-defined actions, and
176!-- last actions on the open files and close files. Unit 14 was opened
177!-- in write_3d_binary but it is closed here, to allow writing on this
178!-- unit in routine user_last_actions.
179    CALL cpu_log( log_point(4), 'last actions', 'start' )
180    CALL user_last_actions
181    IF ( write_binary(1:4) == 'true' )  CALL close_file( 14 )
182    CALL close_file( 0 )
183    CALL close_dvrp
184    CALL cpu_log( log_point(4), 'last actions', 'stop' )
185
186#if defined( __mpi2 )
187!
188!-- Test exchange via intercommunicator
189    IF ( coupling_mode == 'atmosphere_to_ocean' )  THEN
190       i = 12345 + myid
191       CALL MPI_SEND( i, 1, MPI_INTEGER, myid, 11, comm_inter, ierr )
192    ELSEIF ( coupling_mode == 'ocean_to_atmosphere' )  THEN
193       CALL MPI_RECV( i, 1, MPI_INTEGER, myid, 11, comm_inter, status, ierr )
194       PRINT*, '### myid: ', myid, '   received from atmosphere:  i = ', i
195    ENDIF
196#endif
197
198!
199!-- Take final CPU-time for CPU-time analysis
200    CALL cpu_log( log_point(1), 'total', 'stop' )
201    CALL cpu_statistics
202
203#if defined( __parallel )
204    CALL MPI_FINALIZE( ierr )
205#endif
206
207 END PROGRAM palm
208
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