| 1 | !> @file timestep_scheme_steering.f90 |
|---|
| 2 | !------------------------------------------------------------------------------! |
|---|
| 3 | ! This file is part of the PALM model system. |
|---|
| 4 | ! |
|---|
| 5 | ! PALM is free software: you can redistribute it and/or modify it under the |
|---|
| 6 | ! terms of the GNU General Public License as published by the Free Software |
|---|
| 7 | ! Foundation, either version 3 of the License, or (at your option) any later |
|---|
| 8 | ! version. |
|---|
| 9 | ! |
|---|
| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
|---|
| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
|---|
| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
|---|
| 13 | ! |
|---|
| 14 | ! You should have received a copy of the GNU General Public License along with |
|---|
| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
|---|
| 16 | ! |
|---|
| 17 | ! Copyright 1997-2020 Leibniz Universitaet Hannover |
|---|
| 18 | !------------------------------------------------------------------------------! |
|---|
| 19 | ! |
|---|
| 20 | ! Current revisions: |
|---|
| 21 | ! ------------------ |
|---|
| 22 | ! |
|---|
| 23 | ! |
|---|
| 24 | ! Former revisions: |
|---|
| 25 | ! ----------------- |
|---|
| 26 | ! $Id: timestep_scheme_steering.f90 4360 2020-01-07 11:25:50Z raasch $ |
|---|
| 27 | ! Corrected "Former revisions" section |
|---|
| 28 | ! |
|---|
| 29 | ! 3655 2019-01-07 16:51:22Z knoop |
|---|
| 30 | ! OpenACC port for SPEC |
|---|
| 31 | ! |
|---|
| 32 | ! Revision 1.1 2004/01/28 15:34:47 raasch |
|---|
| 33 | ! Initial revision |
|---|
| 34 | ! |
|---|
| 35 | ! |
|---|
| 36 | ! Description: |
|---|
| 37 | ! ------------ |
|---|
| 38 | !> Depending on the timestep scheme set the steering factors for the prognostic |
|---|
| 39 | !> equations. |
|---|
| 40 | !------------------------------------------------------------------------------! |
|---|
| 41 | SUBROUTINE timestep_scheme_steering |
|---|
| 42 | |
|---|
| 43 | |
|---|
| 44 | USE control_parameters, & |
|---|
| 45 | ONLY: intermediate_timestep_count, timestep_scheme, tsc |
|---|
| 46 | |
|---|
| 47 | USE kinds |
|---|
| 48 | |
|---|
| 49 | IMPLICIT NONE |
|---|
| 50 | |
|---|
| 51 | |
|---|
| 52 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
|---|
| 53 | ! |
|---|
| 54 | !-- Runge-Kutta schemes (here the factors depend on the respective |
|---|
| 55 | !-- intermediate step) |
|---|
| 56 | IF ( timestep_scheme == 'runge-kutta-2' ) THEN |
|---|
| 57 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 58 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) |
|---|
| 59 | ELSE |
|---|
| 60 | tsc(1:5) = (/ 1.0_wp, 0.5_wp, -0.5_wp, 0.0_wp, 1.0_wp /) |
|---|
| 61 | ENDIF |
|---|
| 62 | ELSE |
|---|
| 63 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 64 | tsc(1:5) = (/ 1.0_wp, 1.0_wp / 3.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /) |
|---|
| 65 | ELSEIF ( intermediate_timestep_count == 2 ) THEN |
|---|
| 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 /) |
|---|
| 67 | ELSE |
|---|
| 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 /) |
|---|
| 69 | ENDIF |
|---|
| 70 | ENDIF |
|---|
| 71 | |
|---|
| 72 | !$ACC UPDATE DEVICE(tsc(1:5)) |
|---|
| 73 | |
|---|
| 74 | ELSEIF ( timestep_scheme == 'euler' ) THEN |
|---|
| 75 | ! |
|---|
| 76 | !-- Euler scheme |
|---|
| 77 | tsc(1:5) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, 1.0_wp /) |
|---|
| 78 | |
|---|
| 79 | ENDIF |
|---|
| 80 | |
|---|
| 81 | |
|---|
| 82 | END SUBROUTINE timestep_scheme_steering |
|---|
