source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 1321

Last change on this file since 1321 was 1321, 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 1321 2014-03-20 09:40:40Z raasch $
27!
28! 1320 2014-03-20 08:40:49Z raasch
29! ONLY-attribute added to USE-statements
30!
31! 1036 2012-10-22 13:43:42Z raasch
32! code put under GPL (PALM 3.9)
33!
34! 1001 2012-09-13 14:08:46Z raasch
35! all actions concerning leapfrog scheme removed
36!
37! Revision 1.1  2004/01/28 15:34:47  raasch
38! Initial revision
39!
40!
41! Description:
42! ------------
43! Depending on the timestep scheme set the steering factors for the prognostic
44! equations.
45!------------------------------------------------------------------------------!
46
47    USE control_parameters,                                                    &
48        ONLY:  intermediate_timestep_count, timestep_scheme, tsc
49
50    IMPLICIT NONE
51
52
53    IF ( timestep_scheme(1:5) == 'runge' )  THEN
54!
55!--    Runge-Kutta schemes (here the factors depend on the respective
56!--    intermediate step)
57       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
58          IF ( intermediate_timestep_count == 1 )  THEN
59             tsc(1:5) = (/ 1.0, 1.0,  0.0, 0.0, 0.0 /)
60          ELSE
61             tsc(1:5) = (/ 1.0, 0.5, -0.5, 0.0, 1.0 /)
62          ENDIF
63       ELSE
64          IF ( intermediate_timestep_count == 1 )  THEN
65             tsc(1:5) = (/ 1.0,   1.0/3.0,        0.0, 0.0, 0.0 /)
66          ELSEIF ( intermediate_timestep_count == 2 )  THEN
67             tsc(1:5) = (/ 1.0, 15.0/16.0, -25.0/48.0, 0.0, 0.0 /)
68          ELSE
69             tsc(1:5) = (/ 1.0,  8.0/15.0,   1.0/15.0, 0.0, 1.0 /)
70          ENDIF         
71       ENDIF
72
73    ELSEIF ( timestep_scheme == 'euler' )  THEN
74!
75!--    Euler scheme
76       tsc(1:5) = (/ 1.0, 1.0, 0.0, 0.0, 1.0 /)
77
78    ENDIF
79
80
81 END SUBROUTINE timestep_scheme_steering
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