| 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 1997-2020 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 4360 2020-01-07 11:25:50Z Giersch $ |
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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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