source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 4178

Last change on this file since 4178 was 3655, checked in by knoop, 3 years ago

Bugfix: made "unit" and "found" intend INOUT in module interface subroutines + automatic copyright update

  • Property svn:keywords set to Id
File size: 3.2 KB
Line 
1!> @file timestep_scheme_steering.f90
2!------------------------------------------------------------------------------!
3! This file is part of the PALM model system.
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 1997-2019 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: timestep_scheme_steering.f90 3655 2019-01-07 16:51:22Z suehring $
27! OpenACC port for SPEC
28!
29! 2718 2018-01-02 08:49:38Z maronga
30! Corrected "Former revisions" section
31!
32! 2696 2017-12-14 17:12:51Z kanani
33! Change in file header (GPL part)
34!
35! 2101 2017-01-05 16:42:31Z suehring
36!
37! 2000 2016-08-20 18:09:15Z knoop
38! Forced header and separation lines into 80 columns
39!
40! 1682 2015-10-07 23:56:08Z knoop
41! Code annotations made doxygen readable
42!
43! 1322 2014-03-20 16:38:49Z raasch
44! REAL constants defined as wp-kind
45!
46! 1320 2014-03-20 08:40:49Z raasch
47! ONLY-attribute added to USE-statements
48!
49! 1036 2012-10-22 13:43:42Z raasch
50! code put under GPL (PALM 3.9)
51!
52! 1001 2012-09-13 14:08:46Z raasch
53! all actions concerning leapfrog scheme removed
54!
55! Revision 1.1  2004/01/28 15:34:47  raasch
56! Initial revision
57!
58!
59! Description:
60! ------------
61!> Depending on the timestep scheme set the steering factors for the prognostic
62!> equations.
63!------------------------------------------------------------------------------!
64 SUBROUTINE timestep_scheme_steering
65 
66
67    USE control_parameters,                                                    &
68        ONLY:  intermediate_timestep_count, timestep_scheme, tsc
69
70    USE kinds
71
72    IMPLICIT NONE
73
74
75    IF ( timestep_scheme(1:5) == 'runge' )  THEN
76!
77!--    Runge-Kutta schemes (here the factors depend on the respective
78!--    intermediate step)
79       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
80          IF ( intermediate_timestep_count == 1 )  THEN
81             tsc(1:5) = (/ 1.0_wp, 1.0_wp,  0.0_wp, 0.0_wp, 0.0_wp /)
82          ELSE
83             tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /)
84          ENDIF
85       ELSE
86          IF ( intermediate_timestep_count == 1 )  THEN
87             tsc(1:5) = (/ 1.0_wp,  1.0_wp /  3.0_wp,           0.0_wp, 0.0_wp, 0.0_wp /)
88          ELSEIF ( intermediate_timestep_count == 2 )  THEN
89             tsc(1:5) = (/ 1.0_wp, 15.0_wp / 16.0_wp, -25.0_wp/48.0_wp, 0.0_wp, 0.0_wp /)
90          ELSE
91             tsc(1:5) = (/ 1.0_wp,  8.0_wp / 15.0_wp,   1.0_wp/15.0_wp, 0.0_wp, 1.0_wp /)
92          ENDIF         
93       ENDIF
94
95       !$ACC UPDATE DEVICE(tsc(1:5))
96
97    ELSEIF ( timestep_scheme == 'euler' )  THEN
98!
99!--    Euler scheme
100       tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /)
101
102    ENDIF
103
104
105 END SUBROUTINE timestep_scheme_steering
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