source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 2000

Last change on this file since 2000 was 2000, checked in by knoop, 5 years ago

Forced header and separation lines into 80 columns

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1!> @file timestep_scheme_steering.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 1997-2016 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22! Forced header and separation lines into 80 columns
23!
24! Former revisions:
25! -----------------
26! $Id: timestep_scheme_steering.f90 2000 2016-08-20 18:09:15Z knoop $
27!
28! 1682 2015-10-07 23:56:08Z knoop
29! Code annotations made doxygen readable
30!
31! 1322 2014-03-20 16:38:49Z raasch
32! REAL constants defined as wp-kind
33!
34! 1320 2014-03-20 08:40:49Z raasch
35! ONLY-attribute added to USE-statements
36!
37! 1036 2012-10-22 13:43:42Z raasch
38! code put under GPL (PALM 3.9)
39!
40! 1001 2012-09-13 14:08:46Z raasch
41! all actions concerning leapfrog scheme removed
42!
43! Revision 1.1  2004/01/28 15:34:47  raasch
44! Initial revision
45!
46!
47! Description:
48! ------------
49!> Depending on the timestep scheme set the steering factors for the prognostic
50!> equations.
51!------------------------------------------------------------------------------!
52 SUBROUTINE timestep_scheme_steering
53 
54
55    USE control_parameters,                                                    &
56        ONLY:  intermediate_timestep_count, timestep_scheme, tsc
57
58    USE kinds
59
60    IMPLICIT NONE
61
62
63    IF ( timestep_scheme(1:5) == 'runge' )  THEN
64!
65!--    Runge-Kutta schemes (here the factors depend on the respective
66!--    intermediate step)
67       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
68          IF ( intermediate_timestep_count == 1 )  THEN
69             tsc(1:5) = (/ 1.0_wp, 1.0_wp,  0.0_wp, 0.0_wp, 0.0_wp /)
70          ELSE
71             tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /)
72          ENDIF
73       ELSE
74          IF ( intermediate_timestep_count == 1 )  THEN
75             tsc(1:5) = (/ 1.0_wp,  1.0_wp /  3.0_wp,           0.0_wp, 0.0_wp, 0.0_wp /)
76          ELSEIF ( intermediate_timestep_count == 2 )  THEN
77             tsc(1:5) = (/ 1.0_wp, 15.0_wp / 16.0_wp, -25.0_wp/48.0_wp, 0.0_wp, 0.0_wp /)
78          ELSE
79             tsc(1:5) = (/ 1.0_wp,  8.0_wp / 15.0_wp,   1.0_wp/15.0_wp, 0.0_wp, 1.0_wp /)
80          ENDIF         
81       ENDIF
82
83    ELSEIF ( timestep_scheme == 'euler' )  THEN
84!
85!--    Euler scheme
86       tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /)
87
88    ENDIF
89
90
91 END SUBROUTINE timestep_scheme_steering
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