!> @file timestep_scheme_steering.f90 !------------------------------------------------------------------------------! ! This file is part of the PALM model system. ! ! PALM is free software: you can redistribute it and/or modify it under the ! terms of the GNU General Public License as published by the Free Software ! Foundation, either version 3 of the License, or (at your option) any later ! version. ! ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. ! ! You should have received a copy of the GNU General Public License along with ! PALM. If not, see . ! ! Copyright 1997-2017 Leibniz Universitaet Hannover !------------------------------------------------------------------------------! ! ! Current revisions: ! ------------------ ! ! ! Former revisions: ! ----------------- ! $Id: timestep_scheme_steering.f90 2716 2017-12-29 16:35:59Z kanani $ ! Corrected "Former revisions" section ! ! 2696 2017-12-14 17:12:51Z kanani ! Change in file header (GPL part) ! ! 2101 2017-01-05 16:42:31Z suehring ! ! 2000 2016-08-20 18:09:15Z knoop ! Forced header and separation lines into 80 columns ! ! 1682 2015-10-07 23:56:08Z knoop ! Code annotations made doxygen readable ! ! 1322 2014-03-20 16:38:49Z raasch ! REAL constants defined as wp-kind ! ! 1320 2014-03-20 08:40:49Z raasch ! ONLY-attribute added to USE-statements ! ! 1036 2012-10-22 13:43:42Z raasch ! code put under GPL (PALM 3.9) ! ! 1001 2012-09-13 14:08:46Z raasch ! all actions concerning leapfrog scheme removed ! ! Revision 1.1 2004/01/28 15:34:47 raasch ! Initial revision ! ! ! Description: ! ------------ !> Depending on the timestep scheme set the steering factors for the prognostic !> equations. !------------------------------------------------------------------------------! SUBROUTINE timestep_scheme_steering USE control_parameters, & ONLY: intermediate_timestep_count, timestep_scheme, tsc USE kinds IMPLICIT NONE IF ( timestep_scheme(1:5) == 'runge' ) THEN ! !-- Runge-Kutta schemes (here the factors depend on the respective !-- intermediate step) IF ( timestep_scheme == 'runge-kutta-2' ) THEN IF ( intermediate_timestep_count == 1 ) THEN tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) ELSE tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /) ENDIF ELSE IF ( intermediate_timestep_count == 1 ) THEN tsc(1:5) = (/ 1.0_wp, 1.0_wp / 3.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) ELSEIF ( intermediate_timestep_count == 2 ) THEN tsc(1:5) = (/ 1.0_wp, 15.0_wp / 16.0_wp, -25.0_wp/48.0_wp, 0.0_wp, 0.0_wp /) ELSE tsc(1:5) = (/ 1.0_wp, 8.0_wp / 15.0_wp, 1.0_wp/15.0_wp, 0.0_wp, 1.0_wp /) ENDIF ENDIF ELSEIF ( timestep_scheme == 'euler' ) THEN ! !-- Euler scheme tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /) ENDIF END SUBROUTINE timestep_scheme_steering