source: palm/trunk/SOURCE/timestep_scheme_steering.f90 @ 4829

Last change on this file since 4829 was 4828, checked in by Giersch, 4 years ago

Copyright updated to year 2021, interface pmc_sort removed to accelarate the nesting code

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File size: 2.9 KB
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[1682]1!> @file timestep_scheme_steering.f90
[4540]2!--------------------------------------------------------------------------------------------------!
[2696]3! This file is part of the PALM model system.
[1036]4!
[4540]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.
[1036]8!
[4540]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.
[1036]12!
[4540]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/>.
[1036]15!
[4828]16! Copyright 1997-2021 Leibniz Universitaet Hannover
[4540]17!--------------------------------------------------------------------------------------------------!
[1036]18!
[4540]19!
[484]20! Current revisions:
[4540]21! -----------------
[1683]22!
[2001]23!
[1]24! Former revisions:
25! -----------------
[3]26! $Id: timestep_scheme_steering.f90 4828 2021-01-05 11:21:41Z suehring $
[4540]27! File re-formatted to follow the PALM coding standard
28!
29!
30! 4360 2020-01-07 11:25:50Z suehring
[4182]31! Corrected "Former revisions" section
[4540]32!
[4182]33! 3655 2019-01-07 16:51:22Z knoop
[3634]34! OpenACC port for SPEC
[674]35!
[4182]36! Revision 1.1  2004/01/28 15:34:47  raasch
37! Initial revision
38!
39!
[1]40! Description:
41! ------------
[4540]42!> Depending on the timestep scheme set the steering factors for the prognostic equations.
43!--------------------------------------------------------------------------------------------------!
[1682]44 SUBROUTINE timestep_scheme_steering
[1]45
46
[4540]47    USE control_parameters,                                                                        &
48        ONLY:  intermediate_timestep_count,                                                        &
49               timestep_scheme,                                                                    &
50               tsc
51
[1322]52    USE kinds
53
[1]54    IMPLICIT NONE
55
56
57    IF ( timestep_scheme(1:5) == 'runge' )  THEN
58!
[4540]59!--    Runge-Kutta schemes (here the factors depend on the respective intermediate step)
[1]60       IF ( timestep_scheme == 'runge-kutta-2' )  THEN
61          IF ( intermediate_timestep_count == 1 )  THEN
[1322]62             tsc(1:5) = (/ 1.0_wp, 1.0_wp,  0.0_wp, 0.0_wp, 0.0_wp /)
[1]63          ELSE
[1322]64             tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /)
[1]65          ENDIF
66       ELSE
67          IF ( intermediate_timestep_count == 1 )  THEN
[4540]68             tsc(1:5) = (/ 1.0_wp,  1.0_wp /  3.0_wp,          0.0_wp, 0.0_wp, 0.0_wp /)
[1]69          ELSEIF ( intermediate_timestep_count == 2 )  THEN
[1322]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 /)
[1]71          ELSE
[1322]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 /)
[4540]73          ENDIF
[1]74       ENDIF
75
[3634]76       !$ACC UPDATE DEVICE(tsc(1:5))
77
[1001]78    ELSEIF ( timestep_scheme == 'euler' )  THEN
[1]79!
[1001]80!--    Euler scheme
[1322]81       tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /)
[1]82
83    ENDIF
84
85
86 END SUBROUTINE timestep_scheme_steering
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