source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 4598

Last change on this file since 4598 was 4540, checked in by raasch, 11 months ago

files re-formatted to follow the PALM coding standard

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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 terms of the GNU General
6! Public License as published by the Free Software Foundation, either version 3 of the License, or
7! (at your option) any later version.
8!
9! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
10! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
11! Public License for more details.
12!
13! You should have received a copy of the GNU General Public License along with PALM. If not, see
14! <http://www.gnu.org/licenses/>.
15!
16! Copyright 1997-2020 Leibniz Universitaet Hannover
17!--------------------------------------------------------------------------------------------------!
18!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: timestep_scheme_steering.f90 4540 2020-05-18 15:23:29Z suehring $
27! File re-formatted to follow the PALM coding standard
28!
29!
30! 4360 2020-01-07 11:25:50Z suehring
31! Corrected "Former revisions" section
32!
33! 3655 2019-01-07 16:51:22Z knoop
34! OpenACC port for SPEC
35!
36! Revision 1.1  2004/01/28 15:34:47  raasch
37! Initial revision
38!
39!
40! Description:
41! ------------
42!> Depending on the timestep scheme set the steering factors for the prognostic equations.
43!--------------------------------------------------------------------------------------------------!
44 SUBROUTINE timestep_scheme_steering
45
46
47    USE control_parameters,                                                                        &
48        ONLY:  intermediate_timestep_count,                                                        &
49               timestep_scheme,                                                                    &
50               tsc
51
52    USE kinds
53
54    IMPLICIT NONE
55
56
57    IF ( timestep_scheme(1:5) == 'runge' )  THEN
58!
59!--    Runge-Kutta schemes (here the factors depend on the respective intermediate step)
60       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
61          IF ( intermediate_timestep_count == 1 )  THEN
62             tsc(1:5) = (/ 1.0_wp, 1.0_wp,  0.0_wp, 0.0_wp, 0.0_wp /)
63          ELSE
64             tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /)
65          ENDIF
66       ELSE
67          IF ( intermediate_timestep_count == 1 )  THEN
68             tsc(1:5) = (/ 1.0_wp,  1.0_wp /  3.0_wp,          0.0_wp, 0.0_wp, 0.0_wp /)
69          ELSEIF ( intermediate_timestep_count == 2 )  THEN
70             tsc(1:5) = (/ 1.0_wp, 15.0_wp / 16.0_wp, -25.0_wp/48.0_wp, 0.0_wp, 0.0_wp /)
71          ELSE
72             tsc(1:5) = (/ 1.0_wp,  8.0_wp / 15.0_wp,   1.0_wp/15.0_wp, 0.0_wp, 1.0_wp /)
73          ENDIF
74       ENDIF
75
76       !$ACC UPDATE DEVICE(tsc(1:5))
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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