| 1 | SUBROUTINE timestep_scheme_steering |
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| 2 | |
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| 3 | !--------------------------------------------------------------------------------! |
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| 4 | ! This file is part of PALM. |
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| 5 | ! |
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| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 8 | ! either version 3 of the License, or (at your option) any later version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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| 17 | ! Copyright 1997-2012 Leibniz University Hannover |
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| 18 | !--------------------------------------------------------------------------------! |
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| 19 | ! |
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| 20 | ! Current revisions: |
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| 21 | ! ------------------ |
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| 22 | ! |
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| 23 | ! |
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| 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: timestep_scheme_steering.f90 1037 2012-10-22 14:10:22Z maronga $ |
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| 27 | ! |
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| 28 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 29 | ! code put under GPL (PALM 3.9) |
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| 30 | ! |
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| 31 | ! 1001 2012-09-13 14:08:46Z raasch |
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| 32 | ! all actions concerning leapfrog scheme removed |
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| 33 | ! |
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| 34 | ! 673 2011-01-18 16:19:48Z suehring |
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| 35 | ! No pressure term during time integration (tsc(4)=0.0). |
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| 36 | ! |
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| 37 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 38 | ! |
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| 39 | ! Revision 1.2 2005/03/26 21:17:06 raasch |
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| 40 | ! No pressure term for Runge-Kutta-schemes (tsc(4)=0.0) |
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| 41 | ! |
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| 42 | ! Revision 1.1 2004/01/28 15:34:47 raasch |
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| 43 | ! Initial revision |
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| 44 | ! |
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| 45 | ! |
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| 46 | ! Description: |
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| 47 | ! ------------ |
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| 48 | ! Depending on the timestep scheme set the steering factors for the prognostic |
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| 49 | ! equations. |
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| 50 | !------------------------------------------------------------------------------! |
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| 51 | |
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| 52 | USE control_parameters |
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| 53 | |
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| 54 | IMPLICIT NONE |
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| 55 | |
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| 56 | |
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| 57 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
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| 58 | ! |
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| 59 | !-- Runge-Kutta schemes (here the factors depend on the respective |
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| 60 | !-- intermediate step) |
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| 61 | IF ( timestep_scheme == 'runge-kutta-2' ) THEN |
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| 62 | IF ( intermediate_timestep_count == 1 ) THEN |
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| 63 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 0.0, 0.0 /) |
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| 64 | ELSE |
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| 65 | tsc(1:5) = (/ 1.0, 0.5, -0.5, 0.0, 1.0 /) |
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| 66 | ENDIF |
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| 67 | ELSE |
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| 68 | IF ( intermediate_timestep_count == 1 ) THEN |
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| 69 | tsc(1:5) = (/ 1.0, 1.0/3.0, 0.0, 0.0, 0.0 /) |
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| 70 | ELSEIF ( intermediate_timestep_count == 2 ) THEN |
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| 71 | tsc(1:5) = (/ 1.0, 15.0/16.0, -25.0/48.0, 0.0, 0.0 /) |
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| 72 | ELSE |
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| 73 | tsc(1:5) = (/ 1.0, 8.0/15.0, 1.0/15.0, 0.0, 1.0 /) |
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| 74 | ENDIF |
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| 75 | ENDIF |
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| 76 | |
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| 77 | ELSEIF ( timestep_scheme == 'euler' ) THEN |
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| 78 | ! |
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| 79 | !-- Euler scheme |
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| 80 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 0.0, 1.0 /) |
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| 81 | |
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| 82 | ENDIF |
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| 83 | |
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| 84 | |
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| 85 | END SUBROUTINE timestep_scheme_steering |
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