| 1 | !> @file init_advec.f90 |
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| 2 | !------------------------------------------------------------------------------! |
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| 3 | ! This file is part of PALM. |
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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 1997-2017 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: init_advec.f90 2101 2017-01-05 16:42:31Z gronemeier $ |
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| 27 | ! |
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| 28 | ! 2000 2016-08-20 18:09:15Z knoop |
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| 29 | ! Forced header and separation lines into 80 columns |
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| 30 | ! |
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| 31 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 32 | ! Code annotations made doxygen readable |
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| 33 | ! |
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| 34 | ! 1353 2014-04-08 15:21:23Z heinze |
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| 35 | ! REAL constants provided with KIND-attribute |
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| 36 | ! |
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| 37 | ! 1346 2014-03-27 13:18:20Z heinze |
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| 38 | ! Bugfix: REAL constants provided with KIND-attribute especially in call of |
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| 39 | ! intrinsic function like MAX, MIN, SIGN |
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| 40 | ! |
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| 41 | ! 1322 2014-03-20 16:38:49Z raasch |
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| 42 | ! REAL constants defined as wp-kind |
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| 43 | ! |
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| 44 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 45 | ! ONLY-attribute added to USE-statements, |
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| 46 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 47 | ! kinds are defined in new module kinds, |
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| 48 | ! revision history before 2012 removed, |
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| 49 | ! comment fields (!:) to be used for variable explanations added to |
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| 50 | ! all variable declaration statements |
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| 51 | ! |
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| 52 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 53 | ! code put under GPL (PALM 3.9) |
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| 54 | ! |
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| 55 | ! 1003 2012-09-14 14:35:53Z raasch |
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| 56 | ! obsolete variables removed |
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| 57 | ! |
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| 58 | ! 1001 2012-09-13 14:08:46Z raasch |
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| 59 | ! all actions concerning upstream-spline-method removed |
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| 60 | ! |
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| 61 | ! Revision 1.1 1999/02/05 09:07:38 raasch |
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| 62 | ! Initial revision |
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| 63 | ! |
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| 64 | ! |
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| 65 | ! Description: |
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| 66 | ! ------------ |
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| 67 | !> Initialize constant coefficients and parameters for certain advection schemes. |
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| 68 | !------------------------------------------------------------------------------! |
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| 69 | SUBROUTINE init_advec |
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| 70 | |
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| 71 | |
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| 72 | USE advection, & |
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| 73 | ONLY: aex, bex, dex, eex |
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| 74 | |
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| 75 | USE kinds |
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| 76 | |
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| 77 | USE control_parameters, & |
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| 78 | ONLY: scalar_advec |
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| 79 | |
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| 80 | IMPLICIT NONE |
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| 81 | |
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| 82 | INTEGER(iwp) :: i !< |
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| 83 | INTEGER(iwp) :: intervals !< |
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| 84 | INTEGER(iwp) :: j !< |
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| 85 | |
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| 86 | REAL(wp) :: delt !< |
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| 87 | REAL(wp) :: dn !< |
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| 88 | REAL(wp) :: dnneu !< |
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| 89 | REAL(wp) :: ex1 !< |
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| 90 | REAL(wp) :: ex2 !< |
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| 91 | REAL(wp) :: ex3 !< |
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| 92 | REAL(wp) :: ex4 !< |
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| 93 | REAL(wp) :: ex5 !< |
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| 94 | REAL(wp) :: ex6 !< |
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| 95 | REAL(wp) :: sterm !< |
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| 96 | |
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| 97 | |
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| 98 | IF ( scalar_advec == 'bc-scheme' ) THEN |
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| 99 | |
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| 100 | ! |
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| 101 | !-- Compute exponential coefficients for the Bott-Chlond scheme |
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| 102 | intervals = 1000 |
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| 103 | ALLOCATE( aex(intervals), bex(intervals), dex(intervals), eex(intervals) ) |
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| 104 | |
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| 105 | delt = 1.0_wp / REAL( intervals, KIND=wp ) |
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| 106 | sterm = delt * 0.5_wp |
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| 107 | |
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| 108 | DO i = 1, intervals |
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| 109 | |
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| 110 | IF ( sterm > 0.5_wp ) THEN |
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| 111 | dn = -5.0_wp |
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| 112 | ELSE |
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| 113 | dn = 5.0_wp |
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| 114 | ENDIF |
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| 115 | |
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| 116 | DO j = 1, 15 |
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| 117 | ex1 = dn * EXP( -dn ) - EXP( 0.5_wp * dn ) + EXP( -0.5_wp * dn ) |
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| 118 | ex2 = EXP( dn ) - EXP( -dn ) |
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| 119 | ex3 = EXP( -dn ) * ( 1.0_wp - dn ) - 0.5_wp * EXP( 0.5_wp * dn ) & |
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| 120 | - 0.5_wp * EXP( -0.5_wp * dn ) |
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| 121 | ex4 = EXP( dn ) + EXP( -dn ) |
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| 122 | ex5 = dn * sterm + ex1 / ex2 |
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| 123 | ex6 = sterm + ( ex3 * ex2 - ex4 * ex1 ) / ( ex2 * ex2 ) |
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| 124 | dnneu = dn - ex5 / ex6 |
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| 125 | dn = dnneu |
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| 126 | ENDDO |
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| 127 | |
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| 128 | IF ( sterm < 0.5_wp ) dn = MAX( 2.95E-2_wp, dn ) |
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| 129 | IF ( sterm > 0.5_wp ) dn = MIN( -2.95E-2_wp, dn ) |
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| 130 | ex1 = EXP( -dn ) |
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| 131 | ex2 = EXP( dn ) - ex1 |
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| 132 | aex(i) = -ex1 / ex2 |
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| 133 | bex(i) = 1.0_wp / ex2 |
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| 134 | dex(i) = dn |
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| 135 | eex(i) = EXP( dex(i) * 0.5_wp ) |
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| 136 | sterm = sterm + delt |
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| 137 | |
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| 138 | ENDDO |
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| 139 | |
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| 140 | ENDIF |
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| 141 | |
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| 142 | END SUBROUTINE init_advec |
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