/[MITgcm]/MITgcm/pkg/generic_advdiff/gad_os7mp_adv_y.F
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revision 1.3 by jmc, Wed Apr 4 01:39:06 2007 UTC revision 1.4 by adcroft, Fri May 11 17:30:06 2007 UTC
# Line 35  C     == Routine arguments == Line 35  C     == Routine arguments ==
35  C     == Local variables ==  C     == Local variables ==
36        INTEGER i,j        INTEGER i,j
37        _RL cfl,Psi        _RL cfl,Psi
38        _RL vLoc,Fac,Del,DelIp,DelI,Phi,Eps,rp1h,Msk        _RL vLoc,Fac,Del,DelIp,DelI,Phi,Eps,rp1h,rp1h_cfl,Msk
39        _RL Qippp,Qipp,Qip,Qi,Qim,Qimm,Qimmm        _RL Qippp,Qipp,Qip,Qi,Qim,Qimm,Qimmm
40        _RL MskIpp,MskIp,MskI,MskIm,MskImm,MskImmm        _RL MskIpp,MskIp,MskI,MskIm,MskImm,MskImmm
41        _RL d2,d2p1,d2m1,A,B,C,D        _RL d2,d2p1,d2m1,A,B,C,D
# Line 59  C     == Local variables == Line 59  C     == Local variables ==
59          cfl = vLoc          cfl = vLoc
60          IF ( calcCFL ) cfl = abs(vLoc*deltaTloc*recip_dyC(i,j,bi,bj))          IF ( calcCFL ) cfl = abs(vLoc*deltaTloc*recip_dyC(i,j,bi,bj))
61    
62          IF (vLoc.gt.0.) THEN          IF (vTrans(i,j).gt.0.) THEN
63           Qippp = Q(i,j+2)           Qippp = Q(i,j+2)
64           Qipp  = Q(i,j+1)           Qipp  = Q(i,j+1)
65           Qip   = Q(i,j)           Qip   = Q(i,j)
# Line 74  C     == Local variables == Line 74  C     == Local variables ==
74           MskIm   = maskLocS(i,j-1)           MskIm   = maskLocS(i,j-1)
75           MskImm  = maskLocS(i,j-2)           MskImm  = maskLocS(i,j-2)
76           MskImmm = maskLocS(i,j-3)           MskImmm = maskLocS(i,j-3)
77          ELSEIF (vLoc.lt.0.) THEN          ELSEIF (vTrans(i,j).lt.0.) THEN
78           Qippp = Q(i,j-3)           Qippp = Q(i,j-3)
79           Qipp  = Q(i,j-2)           Qipp  = Q(i,j-2)
80           Qip   = Q(i,j-1)           Qip   = Q(i,j-1)
# Line 91  C     == Local variables == Line 91  C     == Local variables ==
91           MskImmm = maskLocS(i,j+3)           MskImmm = maskLocS(i,j+3)
92          ENDIF          ENDIF
93    
94          IF (vLoc.ne.0.) THEN          IF (vTrans(i,j).ne.0.) THEN
95  C        2nd order correction [i i-1]  C        2nd order correction [i i-1]
96           Fac = 1.           Fac = 1.
97           Del = Qip-Qi           Del = Qip-Qi
# Line 130  C        7th order correction [i+2 i+1 i Line 130  C        7th order correction [i+2 i+1 i
130           DelI = ( Qi - Qim ) * MskIm           DelI = ( Qi - Qim ) * MskIm
131           rp1h =sign(1. _d 0,DelI)*sign(1. _d 0,DelIp)           rp1h =sign(1. _d 0,DelI)*sign(1. _d 0,DelIp)
132       &        *abs(DelI+Eps)/abs(DelIp+Eps)       &        *abs(DelI+Eps)/abs(DelIp+Eps)
133             rp1h_cfl = rp1h/(cfl+Eps)
134    
135  C        TVD limiter  C        TVD limiter
136  !        Phi = max(0. _d 0, min( 2./(1-cfl), Phi, 2.*rp1h/cfl ) )  !        Phi = max(0. _d 0, min( 2./(1-cfl), Phi, 2.*rp1h_cfl ) )
137    
138  C        MP limiter  C        MP limiter
139           d2   = ( ( Qip + Qim ) - 2.*Qi  ) * MskI * MskIm           d2   = ( ( Qip + Qim ) - 2.*Qi  ) * MskI * MskIm
# Line 149  C        MP limiter Line 150  C        MP limiter
150           D = d2;           D = d2;
151           dm1h = max(min(A,B,C,D),0. _d 0)+min(max(A,B,C,D),0. _d 0)           dm1h = max(min(A,B,C,D),0. _d 0)+min(max(A,B,C,D),0. _d 0)
152           qMD = 0.5*( ( Qi + Qip ) - dp1h )           qMD = 0.5*( ( Qi + Qip ) - dp1h )
153           qUL = Qi + (1.-cfl)/cfl*( Qi-Qim )           qUL = Qi + (1.-cfl)/(cfl+Eps)*( Qi-Qim )
154           qLC = Qi + 0.5*( 1.+dm1h/(Qi-Qim+Eps) )*(qUL-Qi)           qLC = Qi + 0.5*( 1.+dm1h/(Qi-Qim+Eps) )*(qUL-Qi)
155           PhiMD = 2./(1.-cfl)*(qMD-Qi+Eps)/(Qip-Qi+Eps)           PhiMD = 2./(1.-cfl)*(qMD-Qi+Eps)/(Qip-Qi+Eps)
156           PhiLC = 2.*rp1h/cfl*(qLC-Qi+Eps)/(qUL-Qi+Eps)           PhiLC = 2.*rp1h_cfl*(qLC-Qi+Eps)/(qUL-Qi+Eps)
157           PhiMin = max(min(0. _d 0,PhiMD),           PhiMin = max(min(0. _d 0,PhiMD),
158       &        min(0. _d 0,2.*rp1h/cfl,PhiLC))       &        min(0. _d 0,2.*rp1h_cfl,PhiLC))
159           PhiMax = min(max(2. _d 0/(1.-cfl),PhiMD),           PhiMax = min(max(2. _d 0/(1.-cfl),PhiMD),
160       &        max(0. _d 0,2.*rp1h/cfl,PhiLC))       &        max(0. _d 0,2.*rp1h_cfl,PhiLC))
161           Phi = max(PhiMin,min(Phi,PhiMax))           Phi = max(PhiMin,min(Phi,PhiMax))
162    
163           Psi = Phi * 0.5 * (1. - cfl)           Psi = Phi * 0.5 * (1. - cfl)
164           vT(i,j) = vTrans(i,j)*( Qi + Psi*DelIp )           vT(i,j) = vTrans(i,j)*( Qi + Psi*DelIp )
165          ELSE          ELSE
166           vt(i,j) = 0.           vT(i,j) = 0.
167          ENDIF          ENDIF
168    
169         ENDDO         ENDDO
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