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#include "ctrparam.h" |
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! ========================================================== |
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! |
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! HORDIFF.F: subroutine for calculating horizontal |
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! diffusion of Q. |
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! |
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! ---------------------------------------------------------- |
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! |
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! Revision History: |
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! |
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! When Who What |
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! ---- ---------- ------- |
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! 080100 Chien Wang repack based on CliChem3 & M24x11, |
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! and add cpp. |
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! |
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! ========================================================== |
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SUBROUTINE HORDIFF(DTDIF) |
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#include "BD2G04.COM" |
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COMMON U,V,T,P,Q |
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DIMENSION VT(IM0,JM0,LM0),TT(IM0,JM0,LM0),PT(IM0,JM0), |
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* QT(IM0,JM0,LM0),PU(IM0,JM0),FD(IM0,JM0),DQDY(JM0,LM0) |
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COMMON/HDFLUX/VQHD(JM0,LM0) |
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logical first |
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data first /.true./ |
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I=1 |
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JMM1=JM0-1 |
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FDIFF=2.5E5 |
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FDIFF=5.0E5 |
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if(first)then |
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print *,' HOR DIFF for Q' |
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print *,' FDIFF=',FDIFF |
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print *,'IM0=',IM0,' JM0=',JM0,' LM0=',LM0 |
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first=.false. |
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endif |
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DO 50 J=1,JM0 |
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50 FD(I,J)=P(I,J)*DXYP(J) |
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DO 57 L=1,LM0 |
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DO 57 J=1,JM0 |
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AJL(J,L,56)=AJL(J,L,56)-Q (I,J,L)*P(I,J) |
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57 QT (I,J,L)=Q (I,J,L)*FD(I,J) |
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DO 100 L=1,LM0 |
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DO 100 J=2,JM0 |
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DQDY(J,L)=(Q (1,J,L)-Q (1,J-1,L))/DYV(J) |
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100 CONTINUE |
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DO 200 L=1,LM0 |
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PSAV=0.5*(P(1,1)+P(1,2)) |
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FLUXL=FDIFF*DQDY(2,L)*DXV(2)*PSAV*DTDIF |
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FLUXL=DMAX1( -0.5*QT(1,2,L), DMIN1(0.5*QT(1,1,L),FLUXL)) |
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c FLUXR=0. |
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QT (1,1,L)=QT (1,1,L)+FLUXL |
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DO 210 J=2,JMM1 |
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PSAV=0.5*(P(1,J)+P(1,J+1)) |
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FLUXR=FDIFF*DQDY(J+1,L)*DXV(J+1)*PSAV*DTDIF |
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FLUXR=DMAX1( -0.5*QT(1,J+1,L), DMIN1(0.5*QT(1,J,L),FLUXR)) |
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QT (1,J,L)=QT (1,J,L)+(FLUXR-FLUXL) |
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VQHD(J,L)=-FLUXL/(DXV(J)*0.5*(P(1,J)+P(1,J-1))*DTDIF) |
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FLUXL=FLUXR |
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210 CONTINUE |
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QT (1,JM,L)=QT (1,JM,L)-FLUXR |
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J=JM |
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VQHD(J,L)=-FLUXL/(DXV(J)*0.5*(P(1,J)+P(1,J-1))*DTDIF) |
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200 CONTINUE |
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DO 300 L=1,LM0 |
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DO 300 J=1,JM0 |
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Q (I,J,L)=QT (I,J,L)/FD(I,J) |
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AJL(J,L,56)=AJL(J,L,56)+Q (I,J,L)*P(I,J) |
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300 CONTINUE |
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DOPK=1. |
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RETURN |
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END |
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