source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 1323

Last change on this file since 1323 was 1323, checked in by raasch, 7 years ago

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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!
23!
24! Former revisions:
25! -----------------
26! $Id: timestep_scheme_steering.f90 1323 2014-03-20 17:09:54Z raasch $
27!
28! 1322 2014-03-20 16:38:49Z raasch
29! REAL constants defined as wp-kind
30!
31! 1320 2014-03-20 08:40:49Z raasch
32! ONLY-attribute added to USE-statements
33!
34! 1036 2012-10-22 13:43:42Z raasch
35! code put under GPL (PALM 3.9)
36!
37! 1001 2012-09-13 14:08:46Z raasch
38! all actions concerning leapfrog scheme removed
39!
40! Revision 1.1  2004/01/28 15:34:47  raasch
41! Initial revision
42!
43!
44! Description:
45! ------------
46! Depending on the timestep scheme set the steering factors for the prognostic
47! equations.
48!------------------------------------------------------------------------------!
49
50    USE control_parameters,                                                    &
51        ONLY:  intermediate_timestep_count, timestep_scheme, tsc
52
53    USE kinds
54
55    IMPLICIT NONE
56
57
58    IF ( timestep_scheme(1:5) == 'runge' )  THEN
59!
60!--    Runge-Kutta schemes (here the factors depend on the respective
61!--    intermediate step)
62       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
63          IF ( intermediate_timestep_count == 1 )  THEN
64             tsc(1:5) = (/ 1.0_wp, 1.0_wp,  0.0_wp, 0.0_wp, 0.0_wp /)
65          ELSE
66             tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /)
67          ENDIF
68       ELSE
69          IF ( intermediate_timestep_count == 1 )  THEN
70             tsc(1:5) = (/ 1.0_wp,  1.0_wp /  3.0_wp,           0.0_wp, 0.0_wp, 0.0_wp /)
71          ELSEIF ( intermediate_timestep_count == 2 )  THEN
72             tsc(1:5) = (/ 1.0_wp, 15.0_wp / 16.0_wp, -25.0_wp/48.0_wp, 0.0_wp, 0.0_wp /)
73          ELSE
74             tsc(1:5) = (/ 1.0_wp,  8.0_wp / 15.0_wp,   1.0_wp/15.0_wp, 0.0_wp, 1.0_wp /)
75          ENDIF         
76       ENDIF
77
78    ELSEIF ( timestep_scheme == 'euler' )  THEN
79!
80!--    Euler scheme
81       tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /)
82
83    ENDIF
84
85
86 END SUBROUTINE timestep_scheme_steering
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