| 1 | !> @file init_advec.f90 |
|---|
| 2 | !------------------------------------------------------------------------------! |
|---|
| 3 | ! This file is part of PALM. |
|---|
| 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 1997-2017 Leibniz Universitaet Hannover |
|---|
| 18 | !------------------------------------------------------------------------------! |
|---|
| 19 | ! |
|---|
| 20 | ! Current revisions: |
|---|
| 21 | ! ----------------- |
|---|
| 22 | ! |
|---|
| 23 | ! |
|---|
| 24 | ! Former revisions: |
|---|
| 25 | ! ----------------- |
|---|
| 26 | ! $Id: init_advec.f90 2101 2017-01-05 16:42:31Z raasch $ |
|---|
| 27 | ! |
|---|
| 28 | ! 2000 2016-08-20 18:09:15Z knoop |
|---|
| 29 | ! Forced header and separation lines into 80 columns |
|---|
| 30 | ! |
|---|
| 31 | ! 1682 2015-10-07 23:56:08Z knoop |
|---|
| 32 | ! Code annotations made doxygen readable |
|---|
| 33 | ! |
|---|
| 34 | ! 1353 2014-04-08 15:21:23Z heinze |
|---|
| 35 | ! REAL constants provided with KIND-attribute |
|---|
| 36 | ! |
|---|
| 37 | ! 1346 2014-03-27 13:18:20Z heinze |
|---|
| 38 | ! Bugfix: REAL constants provided with KIND-attribute especially in call of |
|---|
| 39 | ! intrinsic function like MAX, MIN, SIGN |
|---|
| 40 | ! |
|---|
| 41 | ! 1322 2014-03-20 16:38:49Z raasch |
|---|
| 42 | ! REAL constants defined as wp-kind |
|---|
| 43 | ! |
|---|
| 44 | ! 1320 2014-03-20 08:40:49Z raasch |
|---|
| 45 | ! ONLY-attribute added to USE-statements, |
|---|
| 46 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
|---|
| 47 | ! kinds are defined in new module kinds, |
|---|
| 48 | ! revision history before 2012 removed, |
|---|
| 49 | ! comment fields (!:) to be used for variable explanations added to |
|---|
| 50 | ! all variable declaration statements |
|---|
| 51 | ! |
|---|
| 52 | ! 1036 2012-10-22 13:43:42Z raasch |
|---|
| 53 | ! code put under GPL (PALM 3.9) |
|---|
| 54 | ! |
|---|
| 55 | ! 1003 2012-09-14 14:35:53Z raasch |
|---|
| 56 | ! obsolete variables removed |
|---|
| 57 | ! |
|---|
| 58 | ! 1001 2012-09-13 14:08:46Z raasch |
|---|
| 59 | ! all actions concerning upstream-spline-method removed |
|---|
| 60 | ! |
|---|
| 61 | ! Revision 1.1 1999/02/05 09:07:38 raasch |
|---|
| 62 | ! Initial revision |
|---|
| 63 | ! |
|---|
| 64 | ! |
|---|
| 65 | ! Description: |
|---|
| 66 | ! ------------ |
|---|
| 67 | !> Initialize constant coefficients and parameters for certain advection schemes. |
|---|
| 68 | !------------------------------------------------------------------------------! |
|---|
| 69 | SUBROUTINE init_advec |
|---|
| 70 | |
|---|
| 71 | |
|---|
| 72 | USE advection, & |
|---|
| 73 | ONLY: aex, bex, dex, eex |
|---|
| 74 | |
|---|
| 75 | USE kinds |
|---|
| 76 | |
|---|
| 77 | USE control_parameters, & |
|---|
| 78 | ONLY: scalar_advec |
|---|
| 79 | |
|---|
| 80 | IMPLICIT NONE |
|---|
| 81 | |
|---|
| 82 | INTEGER(iwp) :: i !< |
|---|
| 83 | INTEGER(iwp) :: intervals !< |
|---|
| 84 | INTEGER(iwp) :: j !< |
|---|
| 85 | |
|---|
| 86 | REAL(wp) :: delt !< |
|---|
| 87 | REAL(wp) :: dn !< |
|---|
| 88 | REAL(wp) :: dnneu !< |
|---|
| 89 | REAL(wp) :: ex1 !< |
|---|
| 90 | REAL(wp) :: ex2 !< |
|---|
| 91 | REAL(wp) :: ex3 !< |
|---|
| 92 | REAL(wp) :: ex4 !< |
|---|
| 93 | REAL(wp) :: ex5 !< |
|---|
| 94 | REAL(wp) :: ex6 !< |
|---|
| 95 | REAL(wp) :: sterm !< |
|---|
| 96 | |
|---|
| 97 | |
|---|
| 98 | IF ( scalar_advec == 'bc-scheme' ) THEN |
|---|
| 99 | |
|---|
| 100 | ! |
|---|
| 101 | !-- Compute exponential coefficients for the Bott-Chlond scheme |
|---|
| 102 | intervals = 1000 |
|---|
| 103 | ALLOCATE( aex(intervals), bex(intervals), dex(intervals), eex(intervals) ) |
|---|
| 104 | |
|---|
| 105 | delt = 1.0_wp / REAL( intervals, KIND=wp ) |
|---|
| 106 | sterm = delt * 0.5_wp |
|---|
| 107 | |
|---|
| 108 | DO i = 1, intervals |
|---|
| 109 | |
|---|
| 110 | IF ( sterm > 0.5_wp ) THEN |
|---|
| 111 | dn = -5.0_wp |
|---|
| 112 | ELSE |
|---|
| 113 | dn = 5.0_wp |
|---|
| 114 | ENDIF |
|---|
| 115 | |
|---|
| 116 | DO j = 1, 15 |
|---|
| 117 | ex1 = dn * EXP( -dn ) - EXP( 0.5_wp * dn ) + EXP( -0.5_wp * dn ) |
|---|
| 118 | ex2 = EXP( dn ) - EXP( -dn ) |
|---|
| 119 | ex3 = EXP( -dn ) * ( 1.0_wp - dn ) - 0.5_wp * EXP( 0.5_wp * dn ) & |
|---|
| 120 | - 0.5_wp * EXP( -0.5_wp * dn ) |
|---|
| 121 | ex4 = EXP( dn ) + EXP( -dn ) |
|---|
| 122 | ex5 = dn * sterm + ex1 / ex2 |
|---|
| 123 | ex6 = sterm + ( ex3 * ex2 - ex4 * ex1 ) / ( ex2 * ex2 ) |
|---|
| 124 | dnneu = dn - ex5 / ex6 |
|---|
| 125 | dn = dnneu |
|---|
| 126 | ENDDO |
|---|
| 127 | |
|---|
| 128 | IF ( sterm < 0.5_wp ) dn = MAX( 2.95E-2_wp, dn ) |
|---|
| 129 | IF ( sterm > 0.5_wp ) dn = MIN( -2.95E-2_wp, dn ) |
|---|
| 130 | ex1 = EXP( -dn ) |
|---|
| 131 | ex2 = EXP( dn ) - ex1 |
|---|
| 132 | aex(i) = -ex1 / ex2 |
|---|
| 133 | bex(i) = 1.0_wp / ex2 |
|---|
| 134 | dex(i) = dn |
|---|
| 135 | eex(i) = EXP( dex(i) * 0.5_wp ) |
|---|
| 136 | sterm = sterm + delt |
|---|
| 137 | |
|---|
| 138 | ENDDO |
|---|
| 139 | |
|---|
| 140 | ENDIF |
|---|
| 141 | |
|---|
| 142 | END SUBROUTINE init_advec |
|---|
