/[MITgcm]/MITgcm/pkg/seaice/seaice_jfnk.F
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revision 1.20 by jmc, Sat Mar 2 04:35:05 2013 UTC revision 1.22 by mlosch, Tue Apr 23 08:40:06 2013 UTC
# Line 53  C     myThid :: my Thread Id. number Line 53  C     myThid :: my Thread Id. number
53        INTEGER myIter        INTEGER myIter
54        INTEGER myThid        INTEGER myThid
55    
56  #if ( (defined SEAICE_CGRID) && \  #ifdef SEAICE_ALLOW_JFNK
       (defined SEAICE_ALLOW_JFNK) && \  
       (defined SEAICE_ALLOW_DYNAMICS) )  
57  C     !FUNCTIONS:  C     !FUNCTIONS:
58        LOGICAL  DIFFERENT_MULTIPLE        LOGICAL  DIFFERENT_MULTIPLE
59        EXTERNAL DIFFERENT_MULTIPLE        EXTERNAL DIFFERENT_MULTIPLE
# Line 75  C     FGMRES flag that indicates what fg Line 73  C     FGMRES flag that indicates what fg
73        _RL     JFNKresidual        _RL     JFNKresidual
74        _RL     JFNKresidualKm1        _RL     JFNKresidualKm1
75  C     parameters to compute convergence criterion  C     parameters to compute convergence criterion
76        _RL     phi_e, alp_e, JFNKgamma_lin        _RL     JFNKgamma_lin
77        _RL     FGMRESeps        _RL     FGMRESeps
78        _RL     JFNKtol        _RL     JFNKtol
79    
# Line 169  C     compute convergence criterion for Line 167  C     compute convergence criterion for
167         JFNKgamma_lin = JFNKgamma_lin_max         JFNKgamma_lin = JFNKgamma_lin_max
168         IF ( newtonIter.GT.1.AND.newtonIter.LE.SEAICE_JFNK_tolIter         IF ( newtonIter.GT.1.AND.newtonIter.LE.SEAICE_JFNK_tolIter
169       &      .AND.JFNKresidual.LT.JFNKres_t ) THEN       &      .AND.JFNKresidual.LT.JFNKres_t ) THEN
170  C     Eisenstat, 1996, equ.(2.6)  C     Eisenstat and Walker (1996), eq.(2.6)
171          phi_e = 1. _d 0          JFNKgamma_lin = SEAICE_JFNKphi
172          alp_e = 1. _d 0       &       *( JFNKresidual/JFNKresidualKm1 )**SEAICE_JFNKalpha
         JFNKgamma_lin = phi_e*( JFNKresidual/JFNKresidualKm1 )**alp_e  
173          JFNKgamma_lin = min(JFNKgamma_lin_max, JFNKgamma_lin)          JFNKgamma_lin = min(JFNKgamma_lin_max, JFNKgamma_lin)
174          JFNKgamma_lin = max(JFNKgamma_lin_min, JFNKgamma_lin)          JFNKgamma_lin = max(JFNKgamma_lin_min, JFNKgamma_lin)
175         ENDIF         ENDIF
# Line 529  C     iterations, 0.25*du/vIce in the se Line 526  C     iterations, 0.25*du/vIce in the se
526  C     This is the new residual  C     This is the new residual
527        JFNKresidual = resLoc        JFNKresidual = resLoc
528    
529  #endif /* SEAICE_ALLOW_DYNAMICS and SEAICE_CGRID and SEAICE_ALLOW_JFNK */  #endif /* SEAICE_ALLOW_JFNK */
530    
531        RETURN        RETURN
532        END        END
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