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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_os7mp_adv_x.F,v 1.2 2007/01/21 17:25:31 mlosch Exp $ |
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C $Name: $ |
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|
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#include "GAD_OPTIONS.h" |
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|
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SUBROUTINE GAD_OS7MP_ADV_X( |
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I bi,bj,k, calcCFL, deltaTloc, |
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I uTrans, uFld, |
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I maskLocW, Q, |
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O uT, |
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I myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE GAD_OS7MP_ADV_X | |
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C | o Compute Zonal advective Flux of tracer Q using | |
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C | 7th Order DST Sceheme with monotone preserving limiter | |
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C |==========================================================| |
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IMPLICIT NONE |
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|
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C == GLobal variables == |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "GAD.h" |
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|
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C == Routine arguments == |
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INTEGER bi,bj,k |
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LOGICAL calcCFL |
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_RL deltaTloc |
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_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uFld (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS maskLocW(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL Q (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uT (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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|
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C == Local variables == |
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INTEGER i,j |
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_RL cfl,Psi |
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_RL uLoc,Fac,Del,DelIp,DelI,Phi,Eps,rp1h,Msk |
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_RL Qippp,Qipp,Qip,Qi,Qim,Qimm,Qimmm |
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_RL MskIpp,MskIp,MskI,MskIm,MskImm,MskImmm |
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_RL d2,d2p1,d2m1,A,B,C,D |
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_RL dp1h,dm1h,qMD,qUL,qLC,PhiMD,PhiLC,PhiMin,PhiMax |
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|
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Eps = 1. _d -20 |
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|
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DO j=1-Oly,sNy+Oly |
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uT(1-Olx,j)=0. _d 0 |
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uT(2-Olx,j)=0. _d 0 |
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uT(3-Olx,j)=0. _d 0 |
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uT(4-Olx,j)=0. _d 0 |
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uT(sNx+Olx-2,j)=0. _d 0 |
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uT(sNx+Olx-1,j)=0. _d 0 |
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uT(sNx+Olx,j)=0. _d 0 |
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DO i=1-Olx+4,sNx+Olx-3 |
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|
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uLoc = uFld(i,j) |
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cfl = uLoc |
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IF ( calcCFL ) cfl = abs(uLoc*deltaTloc*recip_dxC(i,j,bi,bj)) |
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|
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IF (uLoc.gt.0.) THEN |
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Qippp = Q(i+2,j) |
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Qipp = Q(i+1,j) |
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Qip = Q(i,j) |
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Qi = Q(i-1,j) |
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Qim = Q(i-2,j) |
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Qimm = Q(i-3,j) |
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Qimmm = Q(i-4,j) |
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|
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MskIpp = maskLocW(i+2,j) |
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MskIp = maskLocW(i+1,j) |
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MskI = maskLocW(i,j) |
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MskIm = maskLocW(i-1,j) |
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MskImm = maskLocW(i-2,j) |
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MskImmm = maskLocW(i-3,j) |
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ELSEIF (uLoc.lt.0.) THEN |
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Qippp = Q(i-3,j) |
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Qipp = Q(i-2,j) |
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Qip = Q(i-1,j) |
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Qi = Q(i,j) |
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Qim = Q(i+1,j) |
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Qimm = Q(i+2,j) |
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Qimmm = Q(i+3,j) |
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|
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MskIpp = maskLocW(i-2,j) |
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MskIp = maskLocW(i-1,j) |
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MskI = maskLocW(i,j) |
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MskIm = maskLocW(i+1,j) |
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MskImm = maskLocW(i+2,j) |
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MskImmm = maskLocW(i+3,j) |
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ENDIF |
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|
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IF (uLoc.ne.0.) THEN |
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C 2nd order correction [i i-1] |
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Fac = 1. |
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Del = Qip-Qi |
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Msk = MskI |
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Phi = Msk * Fac * Del |
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C 3rd order correction [i i-1 i-2] |
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Fac = Fac * ( cfl + 1. )/3. |
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Del = Del - ( Qi-Qim ) |
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Msk = Msk * MskIm |
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Phi = Phi - Msk * Fac * Del |
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C 4th order correction [i+1 i i-1 i-2] |
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Fac = Fac * ( cfl - 2. )/4. |
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Del = ( Qipp-2.*Qip+Qi ) - Del |
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Msk = Msk * MskIp |
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Phi = Phi + Msk * Fac * Del |
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C 5th order correction [i+1 i i-1 i-2 i-3] |
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Fac = Fac * ( cfl - 3. )/5. |
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Del = Del - ( Qip-3.*Qi+3.*Qim-Qimm ) |
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Msk = Msk * MskImm |
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Phi = Phi + Msk * Fac * Del |
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C 6th order correction [i+2 i+1 i i-1 i-2 i-3] |
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Fac = Fac * ( cfl + 2. )/6. |
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Del = ( Qippp-4.*Qipp+6.*Qip-4.*Qi+Qim ) - Del |
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Msk = Msk * MskIpp |
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Phi = Phi + Msk * Fac * Del |
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C 7th order correction [i+2 i+1 i i-1 i-2 i-3 i-4] |
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Fac = Fac * ( cfl + 2. )/7. |
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Del = Del - ( Qipp-5.*Qip+10.*Qi-10.*Qim+5.*Qimm-Qimmm ) |
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Msk = Msk * MskImmm |
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Phi = Phi - Msk * Fac * Del |
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|
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DelIp = ( Qip - Qi ) * MskI |
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Phi = sign(1. _d 0,Phi)*sign(1. _d 0,DelIp) |
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& *abs(Phi+Eps)/abs(DelIp+Eps) |
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|
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DelI = ( Qi - Qim ) * MskIm |
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rp1h =sign(1. _d 0,DelI)*sign(1. _d 0,DelIp) |
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& *abs(DelI+Eps)/abs(DelIp+Eps) |
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|
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C TVD limiter |
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! Phi = max(0. _d 0, min( 2./(1-cfl), Phi, 2.*rp1h/cfl ) ) |
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|
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C MP limiter |
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d2 = ( ( Qip + Qim ) - 2.*Qi ) * MskI * MskIm |
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d2p1 = ( ( Qipp + Qi ) - 2.*Qip ) * MskIp * MskI |
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d2m1 = ( ( Qi + Qimm ) - 2.*Qim ) * MskIm * MskImm |
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A = 4.*d2 - d2p1 |
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B = 4.*d2p1 - d2 |
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C = d2 |
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D = d2p1; |
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dp1h = max(min(A,B,C,D),0. _d 0)+min(max(A,B,C,D),0. _d 0) |
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A = 4.*d2m1 - d2 |
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B = 4.*d2 - d2m1 |
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C = d2m1 |
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D = d2; |
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dm1h = max(min(A,B,C,D),0. _d 0)+min(max(A,B,C,D),0. _d 0) |
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qMD = 0.5*( ( Qi + Qip ) - dp1h ) |
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qUL = Qi + (1.-cfl)/cfl*( Qi-Qim ) |
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qLC = Qi + 0.5*( 1.+dm1h/(Qi-Qim+Eps) )*(qUL-Qi) |
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PhiMD = 2./(1.-cfl)*(qMD-Qi+Eps)/(Qip-Qi+Eps) |
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PhiLC = 2.*rp1h/cfl*(qLC-Qi+Eps)/(qUL-Qi+Eps) |
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PhiMin = max(min(0. _d 0,PhiMD), |
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& min(0. _d 0,2.*rp1h/cfl,PhiLC)) |
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PhiMax = min(max(2. _d 0/(1.-cfl),PhiMD), |
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& max(0. _d 0,2.*rp1h/cfl,PhiLC)) |
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Phi = max(PhiMin,min(Phi,PhiMax)) |
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|
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Psi = Phi * 0.5 * (1. - cfl) |
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uT(i,j) = uTrans(i,j)*( Qi + Psi*DelIp ) |
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ELSE |
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uT(i,j) = 0. |
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ENDIF |
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|
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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