/[MITgcm]/MITgcm/pkg/seaice/seaice_jfnk.F
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revision 1.22 by mlosch, Tue Apr 23 08:40:06 2013 UTC revision 1.26 by mlosch, Thu Mar 20 09:24:49 2014 UTC
# Line 76  C     parameters to compute convergence Line 76  C     parameters to compute convergence
76        _RL     JFNKgamma_lin        _RL     JFNKgamma_lin
77        _RL     FGMRESeps        _RL     FGMRESeps
78        _RL     JFNKtol        _RL     JFNKtol
79    C     backward differences extrapolation factors
80          _RL bdfFac, bdfAlpha
81    C
82        _RL     recip_deltaT        _RL     recip_deltaT
83        LOGICAL JFNKconverged, krylovConverged        LOGICAL JFNKconverged, krylovConverged
84        LOGICAL writeNow        LOGICAL writeNow
# Line 85  C     parameters to compute convergence Line 87  C     parameters to compute convergence
87  C     u/vIceRes :: residual of sea-ice momentum equations  C     u/vIceRes :: residual of sea-ice momentum equations
88        _RL uIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL uIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
89        _RL vIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL vIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
90    C     extra time level required for backward difference time stepping
91          _RL duIcNm1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
92          _RL dvIcNm1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
93  C     du/vIce   :: ice velocity increment to be added to u/vIce  C     du/vIce   :: ice velocity increment to be added to u/vIce
94        _RL duIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL duIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
95        _RL dvIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL dvIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
# Line 113  C     with iOutFgmres=1, seaice_fgmres p Line 118  C     with iOutFgmres=1, seaice_fgmres p
118       &     DIFFERENT_MULTIPLE( SEAICE_monFreq, myTime, deltaTClock ) )       &     DIFFERENT_MULTIPLE( SEAICE_monFreq, myTime, deltaTClock ) )
119       &     iOutFGMRES=1       &     iOutFGMRES=1
120    
121    C     backward difference extrapolation factors
122          bdfFac = 0. _d 0
123          IF ( SEAICEuseBDF2 ) THEN
124           IF ( myIter.EQ.nIter0 .AND. SEAICEmomStartBDF.EQ.0 ) THEN
125            bdfFac = 0. _d 0
126           ELSE
127            bdfFac = 0.5 _d 0
128           ENDIF
129          ENDIF
130          bdfAlpha = 1. _d 0 + bdfFac
131    
132        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
133         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
134          DO J=1-OLy,sNy+OLy          DO J=1-OLy,sNy+OLy
# Line 121  C     with iOutFgmres=1, seaice_fgmres p Line 137  C     with iOutFgmres=1, seaice_fgmres p
137            vIceRes(I,J,bi,bj) = 0. _d 0            vIceRes(I,J,bi,bj) = 0. _d 0
138            duIce  (I,J,bi,bj) = 0. _d 0            duIce  (I,J,bi,bj) = 0. _d 0
139            dvIce  (I,J,bi,bj) = 0. _d 0            dvIce  (I,J,bi,bj) = 0. _d 0
140             ENDDO
141            ENDDO
142    C     cycle ice velocities
143            DO J=1-OLy,sNy+OLy
144             DO I=1-OLx,sNx+OLx
145              duIcNm1(I,J,bi,bj) = uIce(I,J,bi,bj) * bdfAlpha
146         &         + ( uIce(I,J,bi,bj) - uIceNm1(I,J,bi,bj) ) * bdfFac
147              dvIcNm1(I,J,bi,bj) = vIce(I,J,bi,bj) * bdfAlpha
148         &         + ( vIce(I,J,bi,bj) - vIceNm1(I,J,bi,bj) ) * bdfFac
149            uIceNm1(I,J,bi,bj) = uIce(I,J,bi,bj)            uIceNm1(I,J,bi,bj) = uIce(I,J,bi,bj)
150            vIceNm1(I,J,bi,bj) = vIce(I,J,bi,bj)            vIceNm1(I,J,bi,bj) = vIce(I,J,bi,bj)
151           ENDDO           ENDDO
152          ENDDO          ENDDO
153    C     As long as IMEX is not properly implemented leave this commented out
154    CML        IF ( .NOT.SEAICEuseIMEX ) THEN
155  C     Compute things that do no change during the Newton iteration:  C     Compute things that do no change during the Newton iteration:
156  C     sea-surface tilt and wind stress:  C     sea-surface tilt and wind stress:
157  C     FORCEX/Y0 - mass*(u/vIceNm1)/deltaT  C     FORCEX/Y0 - mass*(1.5*u/vIceNm1+0.5*(u/vIceNm1-u/vIceNm2))/deltaT
158          DO J=1-OLy,sNy+OLy          DO J=1-OLy,sNy+OLy
159           DO I=1-OLx,sNx+OLx           DO I=1-OLx,sNx+OLx
160            FORCEX(I,J,bi,bj) = FORCEX0(I,J,bi,bj)            FORCEX(I,J,bi,bj) = FORCEX0(I,J,bi,bj)
161       &         + seaiceMassU(I,J,bi,bj)*uIceNm1(I,J,bi,bj)*recip_deltaT       &         + seaiceMassU(I,J,bi,bj)*duIcNm1(I,J,bi,bj)*recip_deltaT
162            FORCEY(I,J,bi,bj) = FORCEY0(I,J,bi,bj)            FORCEY(I,J,bi,bj) = FORCEY0(I,J,bi,bj)
163       &         + seaiceMassV(I,J,bi,bj)*vIceNm1(I,J,bi,bj)*recip_deltaT       &         + seaiceMassV(I,J,bi,bj)*dvIcNm1(I,J,bi,bj)*recip_deltaT
164           ENDDO           ENDDO
165          ENDDO          ENDDO
166    CML        ENDIF
167         ENDDO         ENDDO
168        ENDDO        ENDDO
169  C     Start nonlinear Newton iteration: outer loop iteration  C     Start nonlinear Newton iteration: outer loop iteration
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