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 terms of the GNU General |
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6 | ! Public License as published by the Free Software Foundation, either version 3 of the License, or |
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7 | ! (at your option) any later version. |
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8 | ! |
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9 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the |
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10 | ! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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11 | ! Public License for more details. |
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12 | ! |
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13 | ! You should have received a copy of the GNU General Public License along with PALM. If not, see |
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14 | ! <http://www.gnu.org/licenses/>. |
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15 | ! |
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16 | ! Copyright 1997-2021 Leibniz Universitaet Hannover |
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17 | !--------------------------------------------------------------------------------------------------! |
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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 4828 2021-01-05 11:21:41Z banzhafs $ |
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27 | ! File re-formatted to follow the PALM coding standard |
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28 | ! |
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29 | ! |
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30 | ! 4360 2020-01-07 11:25:50Z suehring |
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31 | ! Corrected "Former revisions" section |
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32 | ! |
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33 | ! 3655 2019-01-07 16:51:22Z knoop |
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34 | ! OpenACC port for SPEC |
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35 | ! |
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36 | ! Revision 1.1 2004/01/28 15:34:47 raasch |
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37 | ! Initial revision |
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38 | ! |
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39 | ! |
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40 | ! Description: |
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41 | ! ------------ |
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42 | !> Depending on the timestep scheme set the steering factors for the prognostic equations. |
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43 | !--------------------------------------------------------------------------------------------------! |
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44 | SUBROUTINE timestep_scheme_steering |
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45 | |
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46 | |
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47 | USE control_parameters, & |
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48 | ONLY: intermediate_timestep_count, & |
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49 | timestep_scheme, & |
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50 | tsc |
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51 | |
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52 | USE kinds |
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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 intermediate step) |
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60 | IF ( timestep_scheme == 'runge-kutta-2' ) THEN |
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61 | IF ( intermediate_timestep_count == 1 ) THEN |
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62 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) |
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63 | ELSE |
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64 | tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /) |
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65 | ENDIF |
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66 | ELSE |
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67 | IF ( intermediate_timestep_count == 1 ) THEN |
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68 | 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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69 | ELSEIF ( intermediate_timestep_count == 2 ) THEN |
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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 /) |
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71 | ELSE |
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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 /) |
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73 | ENDIF |
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74 | ENDIF |
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75 | |
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76 | !$ACC UPDATE DEVICE(tsc(1:5)) |
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77 | |
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78 | ELSEIF ( timestep_scheme == 'euler' ) THEN |
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79 | ! |
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80 | !-- Euler scheme |
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81 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /) |
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82 | |
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83 | ENDIF |
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84 | |
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85 | |
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86 | END SUBROUTINE timestep_scheme_steering |
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