/[MITgcm]/MITgcm/pkg/seaice/seaice_jfnk.F
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revision 1.27 by gforget, Mon Oct 20 03:20:57 2014 UTC revision 1.29 by mlosch, Wed Jan 27 14:03:34 2016 UTC
# Line 63  C     !FUNCTIONS: Line 63  C     !FUNCTIONS:
63    
64  C     !LOCAL VARIABLES:  C     !LOCAL VARIABLES:
65  C     === Local variables ===  C     === Local variables ===
66  C     i,j,bi,bj :: loop indices  C     i,j,k,bi,bj :: loop indices
67        INTEGER i,j,bi,bj        INTEGER i,j,k,bi,bj
68  C     loop indices  C     loop indices
69        INTEGER newtonIter        INTEGER newtonIter
70        INTEGER krylovIter, krylovFails        INTEGER krylovIter, krylovFails
71        INTEGER totalKrylovItersLoc, totalNewtonItersLoc        INTEGER totalKrylovItersLoc, totalNewtonItersLoc
72    C     FGMRES parameters
73    C     im      :: size of Krylov space
74    C     ifgmres :: interation counter
75          INTEGER im
76          PARAMETER ( im = 50 )
77          INTEGER ifgmres
78  C     FGMRES flag that determines amount of output messages of fgmres  C     FGMRES flag that determines amount of output messages of fgmres
79        INTEGER iOutFGMRES        INTEGER iOutFGMRES
80  C     FGMRES flag that indicates what fgmres wants us to do next  C     FGMRES flag that indicates what fgmres wants us to do next
# Line 99  C     du/vIce   :: ice velocity incremen Line 105  C     du/vIce   :: ice velocity incremen
105  C     precomputed (= constant per Newton iteration) versions of  C     precomputed (= constant per Newton iteration) versions of
106  C     zeta, eta, and DWATN, press  C     zeta, eta, and DWATN, press
107        _RL zetaPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL zetaPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
108          _RL zetaZPre(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
109        _RL etaPre  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL etaPre  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
110        _RL etaZPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL etaZPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
111        _RL dwatPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL dwatPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
112    C     work arrays
113          _RL rhs(nVec,nSx,nSy), sol(nVec,nSx,nSy)
114          _RL vv(nVec,im+1,nSx,nSy), w(nVec,im,nSx,nSy)
115          _RL wk1(nVec,nSx,nSy), wk2(nVec,nSx,nSy)
116  CEOP  CEOP
117    
118  C     Initialise  C     Initialise
# Line 187  C     constant for the preconditioner Line 198  C     constant for the preconditioner
198           DO j=1-OLy,sNy+OLy           DO j=1-OLy,sNy+OLy
199            DO i=1-OLx,sNx+OLx            DO i=1-OLx,sNx+OLx
200             zetaPre(I,J,bi,bj) =  zeta(I,J,bi,bj)             zetaPre(I,J,bi,bj) =  zeta(I,J,bi,bj)
201               zetaZPre(I,J,bi,bj)= zetaZ(I,J,bi,bj)
202              etaPre(I,J,bi,bj) =   eta(I,J,bi,bj)              etaPre(I,J,bi,bj) =   eta(I,J,bi,bj)
203             etaZPre(I,J,bi,bj) =  etaZ(I,J,bi,bj)             etaZPre(I,J,bi,bj) =  etaZ(I,J,bi,bj)
204             dwatPre(I,J,bi,bj) = DWATN(I,J,bi,bj)             dwatPre(I,J,bi,bj) = DWATN(I,J,bi,bj)
# Line 225  C     start Krylov iteration (FGMRES) Line 237  C     start Krylov iteration (FGMRES)
237    
238          krylovConverged = .FALSE.          krylovConverged = .FALSE.
239          FGMRESeps = JFNKgamma_lin * JFNKresidual          FGMRESeps = JFNKgamma_lin * JFNKresidual
240    C     map first guess sol; it is zero because the solution is a correction
241           CALL SEAICE_MAP2VEC(nVec,duIce,dvIce,sol,.TRUE.,myThid)
242    C     map rhs and change its sign because we are solving J*u = -F
243            CALL SEAICE_MAP2VEC(nVec,-uIceRes,-vIceRes,rhs,.TRUE.,myThid)
244          DO WHILE ( .NOT.krylovConverged )          DO WHILE ( .NOT.krylovConverged )
245  C     solution vector sol = du/vIce  C     solution vector sol = du/vIce
246  C     residual vector (rhs) Fu = u/vIceRes  C     residual vector (rhs) Fu = u/vIceRes
247  C     output work vectors wk1, -> input work vector wk2  C     output work vectors wk1, -> input work vector wk2
248    
249           CALL SEAICE_FGMRES_DRIVER(  C     map preconditioner results or Jacobian times vector,
250       I        uIceRes, vIceRes,  C     stored in du/vIce to wk2, for iCode=0, wk2 is set to zero,
251       U        duIce, dvIce, iCode,  C     because du/vIce = 0
252       I        FGMRESeps, iOutFGMRES,           CALL SEAICE_MAP2VEC(nVec,duIce,dvIce,wk2,.TRUE.,myThid)
253       I        newtonIter, krylovIter, myTime, myIter, myThid )  C
254             CALL SEAICE_FGMRES (nVec,im,rhs,sol,ifgmres,krylovIter,
255         U        vv,w,wk1,wk2,
256         I        FGMRESeps,SEAICEkrylovIterMax,iOutFGMRES,
257         U        iCode,
258         I        myThid)
259    C    
260             IF ( iCode .EQ. 0 ) THEN
261    C     map sol(ution) vector to du/vIce
262              CALL SEAICE_MAP2VEC(nVec,duIce,dvIce,sol,.FALSE.,myThid)
263             ELSE
264    C     map work vector to du/vIce to either compute a preconditioner
265    C     solution (wk1=rhs) or a Jacobian times wk1
266              CALL SEAICE_MAP2VEC(nVec,duIce,dvIce,wk1,.FALSE.,myThid)
267             ENDIF
268    C     Fill overlaps in updated fields
269             CALL EXCH_UV_XY_RL( duIce, dvIce,.TRUE.,myThid)
270  C     FGMRES returns iCode either asking for an new preconditioned vector  C     FGMRES returns iCode either asking for an new preconditioned vector
271  C     or product of matrix (Jacobian) times vector. For iCode = 0, terminate  C     or product of matrix (Jacobian) times vector. For iCode = 0, terminate
272  C     iteration  C     iteration
# Line 243  C     Call preconditioner Line 275  C     Call preconditioner
275            IF ( SOLV_MAX_ITERS .GT. 0 )            IF ( SOLV_MAX_ITERS .GT. 0 )
276       &         CALL SEAICE_PRECONDITIONER(       &         CALL SEAICE_PRECONDITIONER(
277       U         duIce, dvIce,       U         duIce, dvIce,
278       I         zetaPre, etaPre, etaZpre, dwatPre,       I         zetaPre, etaPre, etaZpre, zetaZpre, dwatPre,
279       I         newtonIter, krylovIter, myTime, myIter, myThid )       I         newtonIter, krylovIter, myTime, myIter, myThid )
280           ELSEIF (iCode.GE.2) THEN           ELSEIF (iCode.GE.2) THEN
281  C     Compute Jacobian times vector  C     Compute Jacobian times vector
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