| 1 | SUBROUTINE init_advec |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! Current revisions: |
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| 5 | ! ----------------- |
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| 6 | ! |
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| 7 | ! |
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| 8 | ! Former revisions: |
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| 9 | ! ----------------- |
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| 10 | ! $Id: init_advec.f90 1004 2012-09-14 14:56:50Z letzel $ |
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| 11 | ! |
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| 12 | ! 1003 2012-09-14 14:35:53Z raasch |
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| 13 | ! obsolete variables removed |
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| 14 | ! |
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| 15 | ! 1001 2012-09-13 14:08:46Z raasch |
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| 16 | ! all actions concerning upstream-spline-method removed |
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| 17 | ! |
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| 18 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 19 | ! |
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| 20 | ! Revision 1.6 2004/04/30 11:59:31 raasch |
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| 21 | ! impulse_advec renamed momentum_advec |
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| 22 | ! |
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| 23 | ! Revision 1.1 1999/02/05 09:07:38 raasch |
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| 24 | ! Initial revision |
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| 25 | ! |
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| 26 | ! |
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| 27 | ! Description: |
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| 28 | ! ------------ |
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| 29 | ! Initialize constant coefficients and parameters for certain advection schemes. |
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| 30 | !------------------------------------------------------------------------------! |
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| 31 | |
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| 32 | USE advection |
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| 33 | USE arrays_3d |
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| 34 | USE indices |
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| 35 | USE control_parameters |
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| 36 | |
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| 37 | IMPLICIT NONE |
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| 38 | |
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| 39 | INTEGER :: i, intervals, j |
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| 40 | REAL :: delt, dn, dnneu, ex1, ex2, ex3, ex4, ex5, ex6, sterm |
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| 41 | |
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| 42 | |
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| 43 | IF ( scalar_advec == 'bc-scheme' ) THEN |
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| 44 | |
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| 45 | ! |
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| 46 | !-- Compute exponential coefficients for the Bott-Chlond scheme |
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| 47 | intervals = 1000 |
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| 48 | ALLOCATE( aex(intervals), bex(intervals), dex(intervals), eex(intervals) ) |
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| 49 | |
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| 50 | delt = 1.0 / REAL( intervals ) |
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| 51 | sterm = delt * 0.5 |
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| 52 | |
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| 53 | DO i = 1, intervals |
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| 54 | |
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| 55 | IF ( sterm > 0.5 ) THEN |
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| 56 | dn = -5.0 |
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| 57 | ELSE |
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| 58 | dn = 5.0 |
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| 59 | ENDIF |
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| 60 | |
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| 61 | DO j = 1, 15 |
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| 62 | ex1 = dn * EXP( -dn ) - EXP( 0.5 * dn ) + EXP( -0.5 * dn ) |
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| 63 | ex2 = EXP( dn ) - EXP( -dn ) |
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| 64 | ex3 = EXP( -dn ) * ( 1.0 - dn ) - 0.5 * EXP( 0.5 * dn ) & |
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| 65 | - 0.5 * EXP( -0.5 * dn ) |
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| 66 | ex4 = EXP( dn ) + EXP( -dn ) |
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| 67 | ex5 = dn * sterm + ex1 / ex2 |
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| 68 | ex6 = sterm + ( ex3 * ex2 - ex4 * ex1 ) / ( ex2 * ex2 ) |
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| 69 | dnneu = dn - ex5 / ex6 |
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| 70 | dn = dnneu |
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| 71 | ENDDO |
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| 72 | |
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| 73 | IF ( sterm < 0.5 ) dn = MAX( 2.95E-2, dn ) |
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| 74 | IF ( sterm > 0.5 ) dn = MIN( -2.95E-2, dn ) |
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| 75 | ex1 = EXP( -dn ) |
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| 76 | ex2 = EXP( dn ) - ex1 |
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| 77 | aex(i) = -ex1 / ex2 |
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| 78 | bex(i) = 1.0 / ex2 |
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| 79 | dex(i) = dn |
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| 80 | eex(i) = EXP( dex(i) * 0.5 ) |
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| 81 | sterm = sterm + delt |
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| 82 | |
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| 83 | ENDDO |
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| 84 | |
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| 85 | ENDIF |
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| 86 | |
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| 87 | END SUBROUTINE init_advec |
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