| 1 | SUBROUTINE timestep_scheme_steering |
|---|
| 2 | |
|---|
| 3 | !------------------------------------------------------------------------------! |
|---|
| 4 | ! Actual revisions: |
|---|
| 5 | ! ----------------- |
|---|
| 6 | ! |
|---|
| 7 | ! |
|---|
| 8 | ! Former revisions: |
|---|
| 9 | ! ----------------- |
|---|
| 10 | ! $Id: timestep_scheme_steering.f90 4 2007-02-13 11:33:16Z franke $ |
|---|
| 11 | ! RCS Log replace by Id keyword, revision history cleaned up |
|---|
| 12 | ! |
|---|
| 13 | ! Revision 1.2 2005/03/26 21:17:06 raasch |
|---|
| 14 | ! No pressure term for Runge-Kutta-schemes (tsc(4)=0.0) |
|---|
| 15 | ! |
|---|
| 16 | ! Revision 1.1 2004/01/28 15:34:47 raasch |
|---|
| 17 | ! Initial revision |
|---|
| 18 | ! |
|---|
| 19 | ! |
|---|
| 20 | ! Description: |
|---|
| 21 | ! ------------ |
|---|
| 22 | ! Depending on the timestep scheme set the steering factors for the prognostic |
|---|
| 23 | ! equations. |
|---|
| 24 | !------------------------------------------------------------------------------! |
|---|
| 25 | |
|---|
| 26 | USE control_parameters |
|---|
| 27 | |
|---|
| 28 | IMPLICIT NONE |
|---|
| 29 | |
|---|
| 30 | |
|---|
| 31 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
|---|
| 32 | ! |
|---|
| 33 | !-- Runge-Kutta schemes (here the factors depend on the respective |
|---|
| 34 | !-- intermediate step) |
|---|
| 35 | IF ( timestep_scheme == 'runge-kutta-2' ) THEN |
|---|
| 36 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 37 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 0.0, 0.0 /) |
|---|
| 38 | ELSE |
|---|
| 39 | tsc(1:5) = (/ 1.0, 0.5, -0.5, 0.0, 1.0 /) |
|---|
| 40 | ENDIF |
|---|
| 41 | ELSE |
|---|
| 42 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 43 | tsc(1:5) = (/ 1.0, 1.0/3.0, 0.0, 0.0, 0.0 /) |
|---|
| 44 | ELSEIF ( intermediate_timestep_count == 2 ) THEN |
|---|
| 45 | tsc(1:5) = (/ 1.0, 15.0/16.0, -25.0/48.0, 0.0, 0.0 /) |
|---|
| 46 | ELSE |
|---|
| 47 | tsc(1:5) = (/ 1.0, 8.0/15.0, 1.0/15.0, 0.0, 1.0 /) |
|---|
| 48 | ENDIF |
|---|
| 49 | ENDIF |
|---|
| 50 | |
|---|
| 51 | ELSE |
|---|
| 52 | |
|---|
| 53 | IF ( .NOT. dt_fixed ) THEN |
|---|
| 54 | ! |
|---|
| 55 | !-- Leapfrog and Euler schemes |
|---|
| 56 | !-- Determine whether after the time step adjustment the Euler- or the |
|---|
| 57 | !-- leapfrog scheme will be applied. The very first time step must always |
|---|
| 58 | !-- be an Euler step. |
|---|
| 59 | IF ( dt_changed ) THEN |
|---|
| 60 | IF ( timestep_scheme == 'leapfrog+euler' .OR. & |
|---|
| 61 | timestep_scheme == 'euler' .OR. simulated_time == 0.0 ) THEN |
|---|
| 62 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 1.0, 1.0 /) |
|---|
| 63 | ELSE |
|---|
| 64 | tsc(1:5) = (/ 0.0, 2.0, 0.0, 1.0, 2.0 /) |
|---|
| 65 | ENDIF |
|---|
| 66 | ELSE |
|---|
| 67 | ! |
|---|
| 68 | !-- No time step change, hence continue with the scheme set by the |
|---|
| 69 | !-- user. |
|---|
| 70 | IF ( timestep_scheme == 'euler' ) THEN |
|---|
| 71 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 1.0, 1.0 /) |
|---|
| 72 | ELSE |
|---|
| 73 | tsc(1:5) = (/ 0.0, 2.0, 0.0, 1.0, 2.0 /) |
|---|
| 74 | ENDIF |
|---|
| 75 | ENDIF |
|---|
| 76 | |
|---|
| 77 | ELSE |
|---|
| 78 | |
|---|
| 79 | ! |
|---|
| 80 | !-- Fixed time step: |
|---|
| 81 | ! |
|---|
| 82 | !-- In any case, the very first time step must always be an Euler step. |
|---|
| 83 | timestep_reason = 'F' |
|---|
| 84 | IF ( simulated_time == 0.0 ) THEN |
|---|
| 85 | dt_changed = .TRUE. |
|---|
| 86 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 1.0, 1.0 /) |
|---|
| 87 | ELSE |
|---|
| 88 | dt_changed = .FALSE. |
|---|
| 89 | IF ( timestep_scheme == 'euler' ) THEN |
|---|
| 90 | tsc(1:5) = (/ 1.0, 1.0, 0.0, 1.0, 1.0 /) |
|---|
| 91 | ELSE |
|---|
| 92 | tsc(1:5) = (/ 0.0, 2.0, 0.0, 1.0, 2.0 /) |
|---|
| 93 | ENDIF |
|---|
| 94 | ENDIF |
|---|
| 95 | |
|---|
| 96 | ENDIF |
|---|
| 97 | |
|---|
| 98 | ENDIF |
|---|
| 99 | |
|---|
| 100 | |
|---|
| 101 | END SUBROUTINE timestep_scheme_steering |
|---|
