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! $Header: /home/cvsroot/LMDZ4/libf/dyn3d/limx.F,v 1.1.1.1 2004/05/19 |
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! 12:53:06 lmdzadmin Exp $ |
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SUBROUTINE limx(s0, sx, sm, pente_max) |
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! Auteurs: P.Le Van, F.Hourdin, F.Forget |
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! ******************************************************************** |
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! Shema d'advection " pseudo amont " . |
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! ******************************************************************** |
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! nq,iq,q,pbaru,pbarv,w sont des arguments d'entree pour le s-pg .... |
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! -------------------------------------------------------------------- |
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USE dimens_m |
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USE paramet_m |
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USE comconst |
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USE disvert_m |
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USE conf_gcm_m |
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USE comgeom |
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IMPLICIT NONE |
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! Arguments: |
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! ---------- |
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REAL pente_max |
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REAL s0(ip1jmp1, llm), sm(ip1jmp1, llm) |
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REAL sx(ip1jmp1, llm) |
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! Local |
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! --------- |
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INTEGER ij, l |
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REAL q(ip1jmp1, llm) |
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REAL dxq(ip1jmp1, llm) |
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REAL dxqu(ip1jmp1) |
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REAL adxqu(ip1jmp1), dxqmax(ip1jmp1) |
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LOGICAL first |
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SAVE first |
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REAL ssum |
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INTEGER ismax, ismin |
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EXTERNAL ssum, convflu, ismin, ismax |
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DATA first/.TRUE./ |
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DO l = 1, llm |
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DO ij = 1, ip1jmp1 |
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q(ij, l) = s0(ij, l)/sm(ij, l) |
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dxq(ij, l) = sx(ij, l)/sm(ij, l) |
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END DO |
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END DO |
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! calcul de la pente a droite et a gauche de la maille |
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DO l = 1, llm |
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DO ij = iip2, ip1jm - 1 |
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dxqu(ij) = q(ij+1, l) - q(ij, l) |
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END DO |
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DO ij = iip1 + iip1, ip1jm, iip1 |
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dxqu(ij) = dxqu(ij-iim) |
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END DO |
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DO ij = iip2, ip1jm |
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adxqu(ij) = abs(dxqu(ij)) |
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END DO |
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! calcul de la pente maximum dans la maille en valeur absolue |
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DO ij = iip2 + 1, ip1jm |
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dxqmax(ij) = pente_max*min(adxqu(ij-1), adxqu(ij)) |
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END DO |
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DO ij = iip1 + iip1, ip1jm, iip1 |
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dxqmax(ij-iim) = dxqmax(ij) |
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END DO |
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! calcul de la pente avec limitation |
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DO ij = iip2 + 1, ip1jm |
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IF (dxqu(ij-1)*dxqu(ij)>0. .AND. dxq(ij,l)*dxqu(ij)>0.) THEN |
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dxq(ij, l) = sign(min(abs(dxq(ij,l)),dxqmax(ij)), dxq(ij,l)) |
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ELSE |
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! extremum local |
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dxq(ij, l) = 0. |
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END IF |
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END DO |
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DO ij = iip1 + iip1, ip1jm, iip1 |
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dxq(ij-iim, l) = dxq(ij, l) |
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END DO |
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DO ij = 1, ip1jmp1 |
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sx(ij, l) = dxq(ij, l)*sm(ij, l) |
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END DO |
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END DO |
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RETURN |
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END SUBROUTINE limx |
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