source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 1320

Last change on this file since 1320 was 1320, checked in by raasch, 7 years ago

ONLY-attribute added to USE-statements,
kind-parameters added to all INTEGER and REAL declaration statements,
kinds are defined in new module kinds,
old module precision_kind is removed,
revision history before 2012 removed,
comment fields (!:) to be used for variable explanations added to all variable declaration statements

  • Property svn:keywords set to Id
File size: 2.5 KB
Line 
1 SUBROUTINE timestep_scheme_steering
2
3!--------------------------------------------------------------------------------!
4! This file is part of PALM.
5!
6! PALM is free software: you can redistribute it and/or modify it under the terms
7! of the GNU General Public License as published by the Free Software Foundation,
8! either version 3 of the License, or (at your option) any later 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 1997-2014 Leibniz Universitaet Hannover
18!--------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22! ONLY-attribute added to USE-statements,
23!
24! Former revisions:
25! -----------------
26! $Id: timestep_scheme_steering.f90 1320 2014-03-20 08:40:49Z raasch $
27!
28! 1036 2012-10-22 13:43:42Z raasch
29! code put under GPL (PALM 3.9)
30!
31! 1001 2012-09-13 14:08:46Z raasch
32! all actions concerning leapfrog scheme removed
33!
34! Revision 1.1  2004/01/28 15:34:47  raasch
35! Initial revision
36!
37!
38! Description:
39! ------------
40! Depending on the timestep scheme set the steering factors for the prognostic
41! equations.
42!------------------------------------------------------------------------------!
43
44    USE control_parameters,                                                    &
45        ONLY:  intermediate_timestep_count, timestep_scheme, tsc
46
47    IMPLICIT NONE
48
49
50    IF ( timestep_scheme(1:5) == 'runge' )  THEN
51!
52!--    Runge-Kutta schemes (here the factors depend on the respective
53!--    intermediate step)
54       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
55          IF ( intermediate_timestep_count == 1 )  THEN
56             tsc(1:5) = (/ 1.0, 1.0,  0.0, 0.0, 0.0 /)
57          ELSE
58             tsc(1:5) = (/ 1.0, 0.5, -0.5, 0.0, 1.0 /)
59          ENDIF
60       ELSE
61          IF ( intermediate_timestep_count == 1 )  THEN
62             tsc(1:5) = (/ 1.0,   1.0/3.0,        0.0, 0.0, 0.0 /)
63          ELSEIF ( intermediate_timestep_count == 2 )  THEN
64             tsc(1:5) = (/ 1.0, 15.0/16.0, -25.0/48.0, 0.0, 0.0 /)
65          ELSE
66             tsc(1:5) = (/ 1.0,  8.0/15.0,   1.0/15.0, 0.0, 1.0 /)
67          ENDIF         
68       ENDIF
69
70    ELSEIF ( timestep_scheme == 'euler' )  THEN
71!
72!--    Euler scheme
73       tsc(1:5) = (/ 1.0, 1.0, 0.0, 0.0, 1.0 /)
74
75    ENDIF
76
77
78 END SUBROUTINE timestep_scheme_steering
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