1 | SUBROUTINE init_advec |
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2 | |
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3 | !--------------------------------------------------------------------------------! |
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4 | ! This file is part of PALM. |
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5 | ! |
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6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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8 | ! either version 3 of the License, or (at your option) any later 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 1997-2012 Leibniz University 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: init_advec.f90 1036 2012-10-22 13:43:42Z raasch $ |
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27 | ! |
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28 | ! 1003 2012-09-14 14:35:53Z raasch |
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29 | ! obsolete variables removed |
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30 | ! |
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31 | ! 1001 2012-09-13 14:08:46Z raasch |
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32 | ! all actions concerning upstream-spline-method removed |
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33 | ! |
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34 | ! RCS Log replace by Id keyword, revision history cleaned up |
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35 | ! |
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36 | ! Revision 1.6 2004/04/30 11:59:31 raasch |
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37 | ! impulse_advec renamed momentum_advec |
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38 | ! |
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39 | ! Revision 1.1 1999/02/05 09:07:38 raasch |
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40 | ! Initial revision |
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41 | ! |
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42 | ! |
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43 | ! Description: |
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44 | ! ------------ |
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45 | ! Initialize constant coefficients and parameters for certain advection schemes. |
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46 | !------------------------------------------------------------------------------! |
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47 | |
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48 | USE advection |
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49 | USE arrays_3d |
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50 | USE indices |
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51 | USE control_parameters |
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52 | |
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53 | IMPLICIT NONE |
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54 | |
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55 | INTEGER :: i, intervals, j |
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56 | REAL :: delt, dn, dnneu, ex1, ex2, ex3, ex4, ex5, ex6, sterm |
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57 | |
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58 | |
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59 | IF ( scalar_advec == 'bc-scheme' ) THEN |
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60 | |
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61 | ! |
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62 | !-- Compute exponential coefficients for the Bott-Chlond scheme |
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63 | intervals = 1000 |
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64 | ALLOCATE( aex(intervals), bex(intervals), dex(intervals), eex(intervals) ) |
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65 | |
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66 | delt = 1.0 / REAL( intervals ) |
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67 | sterm = delt * 0.5 |
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68 | |
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69 | DO i = 1, intervals |
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70 | |
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71 | IF ( sterm > 0.5 ) THEN |
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72 | dn = -5.0 |
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73 | ELSE |
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74 | dn = 5.0 |
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75 | ENDIF |
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76 | |
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77 | DO j = 1, 15 |
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78 | ex1 = dn * EXP( -dn ) - EXP( 0.5 * dn ) + EXP( -0.5 * dn ) |
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79 | ex2 = EXP( dn ) - EXP( -dn ) |
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80 | ex3 = EXP( -dn ) * ( 1.0 - dn ) - 0.5 * EXP( 0.5 * dn ) & |
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81 | - 0.5 * EXP( -0.5 * dn ) |
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82 | ex4 = EXP( dn ) + EXP( -dn ) |
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83 | ex5 = dn * sterm + ex1 / ex2 |
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84 | ex6 = sterm + ( ex3 * ex2 - ex4 * ex1 ) / ( ex2 * ex2 ) |
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85 | dnneu = dn - ex5 / ex6 |
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86 | dn = dnneu |
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87 | ENDDO |
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88 | |
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89 | IF ( sterm < 0.5 ) dn = MAX( 2.95E-2, dn ) |
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90 | IF ( sterm > 0.5 ) dn = MIN( -2.95E-2, dn ) |
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91 | ex1 = EXP( -dn ) |
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92 | ex2 = EXP( dn ) - ex1 |
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93 | aex(i) = -ex1 / ex2 |
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94 | bex(i) = 1.0 / ex2 |
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95 | dex(i) = dn |
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96 | eex(i) = EXP( dex(i) * 0.5 ) |
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97 | sterm = sterm + delt |
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98 | |
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99 | ENDDO |
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100 | |
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101 | ENDIF |
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102 | |
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103 | END SUBROUTINE init_advec |
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