/[MITgcm]/MITgcm/pkg/seaice/seaice_calc_strainrates.F
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revision 1.14 by mlosch, Wed Jun 24 08:23:38 2009 UTC revision 1.16 by gforget, Tue Mar 16 19:21:31 2010 UTC
# Line 51  CEndOfInterface Line 51  CEndOfInterface
51  C     === Local variables ===  C     === Local variables ===
52  C     i,j,bi,bj - Loop counters  C     i,j,bi,bj - Loop counters
53        INTEGER i, j, bi, bj        INTEGER i, j, bi, bj
54  C  hFacU, hFacV - determine the no-slip boundary condition  C     hFacU, hFacV - determine the no-slip boundary condition
55        INTEGER k        INTEGER k
56        _RS hFacU, hFacV, noSlipFac        _RS hFacU, hFacV, noSlipFac
57    C     auxillary variables that help writing code that
58    C     vectorizes even after TAFization
59          _RL dudx (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
60          _RL dvdy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
61          _RL dudy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
62          _RL dvdx (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
63          _RL uave (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
64          _RL vave (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
65    
66        k = 1        k = 1
67        noSlipFac = 0. _d 0        noSlipFac = 0. _d 0
# Line 62  C Line 70  C
70  #ifndef SEAICE_OLD_AND_BAD_DISCRETIZATION  #ifndef SEAICE_OLD_AND_BAD_DISCRETIZATION
71        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
72         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
73    C     abbreviations on C-points, need to do them in separate loops
74    C     for vectorization
75          DO j=1-Oly,sNy+Oly-1          DO j=1-Oly,sNy+Oly-1
76           DO i=1-Olx,sNx+Olx-1           DO i=1-Olx,sNx+Olx-1
77  C     evaluate strain rates            dudx(I,J) = _recip_dxF(I,J,bi,bj) *
           e11Loc(I,J,bi,bj) = _recip_dxF(I,J,bi,bj) *  
78       &         (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj))       &         (uFld(I+1,J,bi,bj)-uFld(I,J,bi,bj))
79       &         +HALF*            uave(I,J) = 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I+1,J,bi,bj))
80       &         (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj))           ENDDO
81       &         * k2AtC(I,J,bi,bj)          ENDDO
82            e22Loc(I,J,bi,bj) = _recip_dyF(I,J,bi,bj) *          DO j=1-Oly,sNy+Oly-1
83             DO i=1-Olx,sNx+Olx-1
84              dvdy(I,J) = _recip_dyF(I,J,bi,bj) *
85       &         (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj))       &         (vFld(I,J+1,bi,bj)-vFld(I,J,bi,bj))
86       &         +HALF*            vave(I,J) = 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I,J+1,bi,bj))
      &         (uFld(I,J,bi,bj)+uFld(I+1,J,bi,bj))  
      &         * k1AtC(I,J,bi,bj)  
87           ENDDO           ENDDO
88          ENDDO          ENDDO
89    C     evaluate strain rates at C-points
90            DO j=1-Oly,sNy+Oly-1
91             DO i=1-Olx,sNx+Olx-1
92              e11Loc(I,J,bi,bj) = dudx(I,J) + vave(I,J) * k2AtC(I,J,bi,bj)
93              e22Loc(I,J,bi,bj) = dvdy(I,J) + uave(I,J) * k1AtC(I,J,bi,bj)
94             ENDDO
95            ENDDO
96    C     abbreviations at Z-points, need to do them in separate loops
97    C     for vectorization
98          DO j=1-Oly+1,sNy+Oly          DO j=1-Oly+1,sNy+Oly
99           DO i=1-Olx+1,sNx+Olx           DO i=1-Olx+1,sNx+Olx
100            hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj)            dudy(I,J) = ( uFld(I,J,bi,bj) - uFld(I  ,J-1,bi,bj) )
           hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj)  
           e12Loc(I,J,bi,bj) = HALF*(  
      &           ( uFld(I,J,bi,bj) - uFld(I  ,J-1,bi,bj) )  
101       &         * _recip_dyU(I,J,bi,bj)       &         * _recip_dyU(I,J,bi,bj)
102       &         + ( vFld(I,J,bi,bj) - vFld(I-1,J  ,bi,bj) )            uave(I,J) = 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I  ,J-1,bi,bj))
103             ENDDO
104            ENDDO
105            DO j=1-Oly+1,sNy+Oly
106             DO i=1-Olx+1,sNx+Olx
107              dvdx(I,J) = ( vFld(I,J,bi,bj) - vFld(I-1,J  ,bi,bj) )
108       &         * _recip_dxV(I,J,bi,bj)       &         * _recip_dxV(I,J,bi,bj)
109       &         - k1AtZ(I,J,bi,bj)            vave(I,J) = 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I-1,J  ,bi,bj))
110       &         * 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I-1,J  ,bi,bj))           ENDDO
111       &         - k2AtZ(I,J,bi,bj)          ENDDO
112       &         * 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I  ,J-1,bi,bj))  C     evaluate strain rates at Z-points
113            DO j=1-Oly+1,sNy+Oly
114             DO i=1-Olx+1,sNx+Olx
115              hFacU = _maskW(i,j,k,bi,bj) - _maskW(i,j-1,k,bi,bj)
116              hFacV = _maskS(i,j,k,bi,bj) - _maskS(i-1,j,k,bi,bj)
117              e12Loc(I,J,bi,bj) = 0.5 _d 0 * (
118         &         dudy(I,J) + dvdx(I,J)
119         &         - k1AtZ(I,J,bi,bj) * vave(I,J)
120         &         - k2AtZ(I,J,bi,bj) * uave(I,J)
121       &         )       &         )
122       &         *maskC(I  ,J  ,k,bi,bj)*maskC(I-1,J  ,k,bi,bj)       &         *maskC(I  ,J  ,k,bi,bj)*maskC(I-1,J  ,k,bi,bj)
123       &         *maskC(I  ,J-1,k,bi,bj)*maskC(I-1,J-1,k,bi,bj)       &         *maskC(I  ,J-1,k,bi,bj)*maskC(I-1,J-1,k,bi,bj)
124       &         + 2.0 _d 0 * noSlipFac * (       &         + 2.0 _d 0 * noSlipFac * (
125       &           ( uFld(I,J,bi,bj) + uFld(I  ,J-1,bi,bj) )       &           2.0 _d 0 * uave(I,J) * _recip_dyU(I,J,bi,bj) * hFacU
126       &         * _recip_dyU(I,J,bi,bj) * hFacU       &         + 2.0 _d 0 * vave(I,J) * _recip_dxV(I,J,bi,bj) * hFacV
      &         + ( vFld(I,J,bi,bj) + vFld(I-1,J  ,bi,bj) )  
      &         * _recip_dxV(I,J,bi,bj) * hFacV  
127       &         )       &         )
128  C     no slip at the boundary implies u(j)+u(j-1)=0 and v(i)+v(i-1)=0  C     no slip at the boundary implies u(j)+u(j-1)=0 and v(i)+v(i-1)=0
129  C     accross the boundary; this is already accomplished by masking so  C     accross the boundary; this is already accomplished by masking so
130  C     that the following lines are not necessary  C     that the following lines are not necessary
131  c$$$     &         - hFacV * k1AtZ(I,J,bi,bj)  c$$$     &         - hFacV * k1AtZ(I,J,bi,bj) * vave(I,J)
132  c$$$     &         * 0.5 _d 0 * (vFld(I,J,bi,bj)+vFld(I-1,J  ,bi,bj))  c$$$     &         - hFacU * k2AtZ(I,J,bi,bj) * uave(I,J)
 c$$$     &         - hFacU * k2AtZ(I,J,bi,bj)  
 c$$$     &         * 0.5 _d 0 * (uFld(I,J,bi,bj)+uFld(I  ,J-1,bi,bj))  
133           ENDDO           ENDDO
134          ENDDO          ENDDO
135    
 c$$$        ENDIF  
136         ENDDO         ENDDO
137        ENDDO        ENDDO
138  #else  #else
# Line 173  C     one metric term is missing Line 196  C     one metric term is missing
196         ENDDO         ENDDO
197        ENDDO        ENDDO
198  #endif /* SEAICE_OLD_AND_BAD_DISCRETIZATION */  #endif /* SEAICE_OLD_AND_BAD_DISCRETIZATION */
199    
200    #ifdef ALLOW_AUTODIFF_TAMC
201    #ifdef SEAICE_DYN_STABLE_ADJOINT
202    cgf zero out adjoint fields to stabilize pkg/seaice dyna. adjoint
203          CALL ZERO_ADJ( 1, e11Loc, myThid)
204          CALL ZERO_ADJ( 1, e12Loc, myThid)
205          CALL ZERO_ADJ( 1, e22Loc, myThid)
206    #endif
207    #endif /* ALLOW_AUTODIFF_TAMC */
208    
209  #endif /* SEAICE_ALLOW_DYNAMICS */  #endif /* SEAICE_ALLOW_DYNAMICS */
210  #endif /* SEAICE_CGRID */  #endif /* SEAICE_CGRID */
211        RETURN        RETURN
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