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 1997-2019 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 4182 2019-08-22 15:20:23Z scharf $ |
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27 | ! Corrected "Former revisions" section |
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28 | ! |
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29 | ! 3655 2019-01-07 16:51:22Z knoop |
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30 | ! OpenACC port for SPEC |
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31 | ! |
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32 | ! Revision 1.1 2004/01/28 15:34:47 raasch |
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33 | ! Initial revision |
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34 | ! |
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35 | ! |
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36 | ! Description: |
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37 | ! ------------ |
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38 | !> Depending on the timestep scheme set the steering factors for the prognostic |
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39 | !> equations. |
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40 | !------------------------------------------------------------------------------! |
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41 | SUBROUTINE timestep_scheme_steering |
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42 | |
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43 | |
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44 | USE control_parameters, & |
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45 | ONLY: intermediate_timestep_count, timestep_scheme, tsc |
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46 | |
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47 | USE kinds |
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48 | |
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49 | IMPLICIT NONE |
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50 | |
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51 | |
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52 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
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53 | ! |
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54 | !-- Runge-Kutta schemes (here the factors depend on the respective |
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55 | !-- intermediate step) |
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56 | IF ( timestep_scheme == 'runge-kutta-2' ) THEN |
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57 | IF ( intermediate_timestep_count == 1 ) THEN |
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58 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) |
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59 | ELSE |
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60 | tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /) |
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61 | ENDIF |
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62 | ELSE |
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63 | IF ( intermediate_timestep_count == 1 ) THEN |
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64 | 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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65 | ELSEIF ( intermediate_timestep_count == 2 ) THEN |
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66 | 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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67 | ELSE |
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68 | 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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69 | ENDIF |
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70 | ENDIF |
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71 | |
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72 | !$ACC UPDATE DEVICE(tsc(1:5)) |
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73 | |
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74 | ELSEIF ( timestep_scheme == 'euler' ) THEN |
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75 | ! |
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76 | !-- Euler scheme |
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77 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /) |
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78 | |
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79 | ENDIF |
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80 | |
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81 | |
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82 | END SUBROUTINE timestep_scheme_steering |
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