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! $Header: /home/cvsroot/LMDZ4/libf/dyn3d/limx.F,v 1.1.1.1 2004/05/19 12:53:06 lmdzadmin Exp $ |
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SUBROUTINE limx(s0,sx,sm,pente_max) |
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c |
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c Auteurs: P.Le Van, F.Hourdin, F.Forget |
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c |
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c ******************************************************************** |
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c Shema d'advection " pseudo amont " . |
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c ******************************************************************** |
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c nq,iq,q,pbaru,pbarv,w sont des arguments d'entree pour le s-pg .... |
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c |
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c |
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c -------------------------------------------------------------------- |
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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 comvert |
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use logic |
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use comgeom |
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IMPLICIT NONE |
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c |
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c |
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c |
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c Arguments: |
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c ---------- |
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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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c |
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c Local |
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c --------- |
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c |
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INTEGER ij,l,j,i,iju,ijq,indu(ip1jmp1),niju |
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integer n0,iadvplus(ip1jmp1,llm),nl(llm) |
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c |
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REAL q(ip1jmp1,llm) |
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real dxq(ip1jmp1,llm) |
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REAL new_m,zm |
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real dxqu(ip1jmp1) |
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real adxqu(ip1jmp1),dxqmax(ip1jmp1) |
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Logical extremum,first |
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save first |
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REAL SSUM,CVMGP,CVMGT |
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integer ismax,ismin |
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EXTERNAL SSUM, convflu,ismin,ismax |
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EXTERNAL filtreg |
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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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ENDDO |
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ENDDO |
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c 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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enddo |
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do ij=iip1+iip1,ip1jm,iip1 |
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dxqu(ij)=dxqu(ij-iim) |
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enddo |
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do ij=iip2,ip1jm |
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adxqu(ij)=abs(dxqu(ij)) |
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enddo |
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c 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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enddo |
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do ij=iip1+iip1,ip1jm,iip1 |
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dxqmax(ij-iim)=dxqmax(ij) |
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enddo |
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c 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).gt.0. |
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& .and. dxq(ij,l)*dxqu(ij).gt.0.) then |
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dxq(ij,l)= |
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& sign(min(abs(dxq(ij,l)),dxqmax(ij)),dxq(ij,l)) |
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else |
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c extremum local |
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dxq(ij,l)=0. |
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endif |
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enddo |
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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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enddo |
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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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ENDDO |
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ENDDO |
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RETURN |
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END |
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