1 | !> @file timestep_scheme_steering.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of the PALM model system. |
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4 | ! |
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5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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6 | ! terms of the GNU General Public License as published by the Free Software |
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7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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8 | ! 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 1997-2017 Leibniz Universitaet 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 2696 2017-12-14 17:12:51Z kanani $ |
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27 | ! |
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28 | ! 2000 2016-08-20 18:09:15Z knoop |
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29 | ! Forced header and separation lines into 80 columns |
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30 | ! |
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31 | ! 1682 2015-10-07 23:56:08Z knoop |
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32 | ! Code annotations made doxygen readable |
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33 | ! |
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34 | ! 1322 2014-03-20 16:38:49Z raasch |
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35 | ! REAL constants defined as wp-kind |
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36 | ! |
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37 | ! 1320 2014-03-20 08:40:49Z raasch |
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38 | ! ONLY-attribute added to USE-statements |
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39 | ! |
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40 | ! 1036 2012-10-22 13:43:42Z raasch |
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41 | ! code put under GPL (PALM 3.9) |
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42 | ! |
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43 | ! 1001 2012-09-13 14:08:46Z raasch |
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44 | ! all actions concerning leapfrog scheme removed |
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45 | ! |
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46 | ! Revision 1.1 2004/01/28 15:34:47 raasch |
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47 | ! Initial revision |
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48 | ! |
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49 | ! |
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50 | ! Description: |
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51 | ! ------------ |
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52 | !> Depending on the timestep scheme set the steering factors for the prognostic |
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53 | !> equations. |
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54 | !------------------------------------------------------------------------------! |
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55 | SUBROUTINE timestep_scheme_steering |
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56 | |
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57 | |
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58 | USE control_parameters, & |
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59 | ONLY: intermediate_timestep_count, timestep_scheme, tsc |
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60 | |
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61 | USE kinds |
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62 | |
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63 | IMPLICIT NONE |
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64 | |
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65 | |
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66 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
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67 | ! |
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68 | !-- Runge-Kutta schemes (here the factors depend on the respective |
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69 | !-- intermediate step) |
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70 | IF ( timestep_scheme == 'runge-kutta-2' ) THEN |
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71 | IF ( intermediate_timestep_count == 1 ) THEN |
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72 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) |
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73 | ELSE |
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74 | tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /) |
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75 | ENDIF |
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76 | ELSE |
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77 | IF ( intermediate_timestep_count == 1 ) THEN |
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78 | tsc(1:5) = (/ 1.0_wp, 1.0_wp / 3.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) |
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79 | ELSEIF ( intermediate_timestep_count == 2 ) THEN |
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80 | tsc(1:5) = (/ 1.0_wp, 15.0_wp / 16.0_wp, -25.0_wp/48.0_wp, 0.0_wp, 0.0_wp /) |
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81 | ELSE |
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82 | tsc(1:5) = (/ 1.0_wp, 8.0_wp / 15.0_wp, 1.0_wp/15.0_wp, 0.0_wp, 1.0_wp /) |
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83 | ENDIF |
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84 | ENDIF |
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85 | |
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86 | ELSEIF ( timestep_scheme == 'euler' ) THEN |
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87 | ! |
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88 | !-- Euler scheme |
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89 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /) |
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90 | |
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91 | ENDIF |
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92 | |
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93 | |
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94 | END SUBROUTINE timestep_scheme_steering |
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