SUBROUTINE init_advec !--------------------------------------------------------------------------------! ! This file is part of PALM. ! ! PALM is free software: you can redistribute it and/or modify it under the terms ! of the GNU General Public License as published by the Free Software Foundation, ! either version 3 of the License, or (at your option) any later version. ! ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. ! ! You should have received a copy of the GNU General Public License along with ! PALM. If not, see . ! ! Copyright 1997-2012 Leibniz University Hannover !--------------------------------------------------------------------------------! ! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ----------------- ! $Id: init_advec.f90 1037 2012-10-22 14:10:22Z gronemeier $ ! ! 1036 2012-10-22 13:43:42Z raasch ! code put under GPL (PALM 3.9) ! ! 1003 2012-09-14 14:35:53Z raasch ! obsolete variables removed ! ! 1001 2012-09-13 14:08:46Z raasch ! all actions concerning upstream-spline-method removed ! ! RCS Log replace by Id keyword, revision history cleaned up ! ! Revision 1.6 2004/04/30 11:59:31 raasch ! impulse_advec renamed momentum_advec ! ! Revision 1.1 1999/02/05 09:07:38 raasch ! Initial revision ! ! ! Description: ! ------------ ! Initialize constant coefficients and parameters for certain advection schemes. !------------------------------------------------------------------------------! USE advection USE arrays_3d USE indices USE control_parameters IMPLICIT NONE INTEGER :: i, intervals, j REAL :: delt, dn, dnneu, ex1, ex2, ex3, ex4, ex5, ex6, sterm IF ( scalar_advec == 'bc-scheme' ) THEN ! !-- Compute exponential coefficients for the Bott-Chlond scheme intervals = 1000 ALLOCATE( aex(intervals), bex(intervals), dex(intervals), eex(intervals) ) delt = 1.0 / REAL( intervals ) sterm = delt * 0.5 DO i = 1, intervals IF ( sterm > 0.5 ) THEN dn = -5.0 ELSE dn = 5.0 ENDIF DO j = 1, 15 ex1 = dn * EXP( -dn ) - EXP( 0.5 * dn ) + EXP( -0.5 * dn ) ex2 = EXP( dn ) - EXP( -dn ) ex3 = EXP( -dn ) * ( 1.0 - dn ) - 0.5 * EXP( 0.5 * dn ) & - 0.5 * EXP( -0.5 * dn ) ex4 = EXP( dn ) + EXP( -dn ) ex5 = dn * sterm + ex1 / ex2 ex6 = sterm + ( ex3 * ex2 - ex4 * ex1 ) / ( ex2 * ex2 ) dnneu = dn - ex5 / ex6 dn = dnneu ENDDO IF ( sterm < 0.5 ) dn = MAX( 2.95E-2, dn ) IF ( sterm > 0.5 ) dn = MIN( -2.95E-2, dn ) ex1 = EXP( -dn ) ex2 = EXP( dn ) - ex1 aex(i) = -ex1 / ex2 bex(i) = 1.0 / ex2 dex(i) = dn eex(i) = EXP( dex(i) * 0.5 ) sterm = sterm + delt ENDDO ENDIF END SUBROUTINE init_advec