/[MITgcm]/MITgcm/pkg/mom_fluxform/mom_u_del2u.F
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revision 1.1 by adcroft, Wed Mar 28 19:51:14 2001 UTC revision 1.2 by adcroft, Tue May 29 14:01:38 2001 UTC
# Line 0  Line 1 
1    C $Header$
2    C $Name$
3    
4    #include "CPP_OPTIONS.h"
5    
6          SUBROUTINE MOM_U_DEL2U(
7         I        bi,bj,k,
8         I        uFld, hFacZ,
9         O        del2u,
10         I        myThid)
11          IMPLICIT NONE
12    C
13    C     Calculate horizontal del^2 of uFld
14    C       - is not vector invariant ...
15    C
16    
17    C     == Global variables ==
18    #include "SIZE.h"
19    #include "EEPARAMS.h"
20    #include "PARAMS.h"
21    #include "GRID.h"
22    #include "DYNVARS.h"
23    
24    C     == Routine arguments ==
25          INTEGER bi,bj,k
26          _RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
27          _RS hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
28          _RL del2u(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
29          INTEGER myThid
30    
31    C     == Local variables ==
32          INTEGER I,J
33          _RL fZon(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
34          _RL fMer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
35          _RS hFacZClosedS,hFacZClosedN
36    
37    C     Zonal flux d/dx U
38          DO j=1-Oly,sNy+Oly
39           DO i=1-Olx,sNx+Olx-1
40            fZon(i,j) = drF(k)*_hFacC(i,j,k,bi,bj)
41         &   *_dyF(i,j,bi,bj)
42         &   *_recip_dxF(i,j,bi,bj)
43         &   *(uFld(i+1,j)-uFld(i,j))
44    #ifdef COSINEMETH_III
45         &   *sqcosFacU(J,bi,bj)
46    #endif
47           ENDDO
48          ENDDO
49    
50    C     Meridional flux d/dy U
51          DO j=1-Oly+1,sNy+Oly
52           DO i=1-Olx,sNx+Olx
53            fMer(i,j) = drF(k)*hFacZ(i,j)
54         &   *_dxV(i,j,bi,bj)
55         &   *_recip_dyU(i,j,bi,bj)
56         &   *(uFld(i,j)-uFld(i,j-1))
57           ENDDO
58          ENDDO
59    
60    C     del^2 U
61          DO j=0,sNy+1
62           DO i=0,sNx+2
63            del2u(i,j) =
64         &  recip_drF(k)*_recip_hFacW(i,j,k,bi,bj)
65         &  *recip_rAw(i,j,bi,bj)
66         &  *( fZon(i,j  )    - fZon(i-1,j)
67         &    +fMer(i,j+1)    - fMer(i  ,j)
68         &   )*_maskW(i,j,k,bi,bj)
69           ENDDO
70          ENDDO
71    
72          IF (no_slip_sides) THEN
73    C-- No-slip BCs impose a drag at walls...
74          DO j=0,sNy+1
75           DO i=0,sNx+2
76            hFacZClosedS = _hFacW(i,j,k,bi,bj) - hFacZ(i,j)
77            hFacZClosedN = _hFacW(i,j,k,bi,bj) - hFacZ(i,j+1)
78            del2u(i,j) = del2u(i,j)
79         &  - _recip_hFacW(i,j,k,bi,bj)*recip_drF(k)
80         &   *recip_rAw(i,j,bi,bj)
81         &   *( hFacZClosedS*dxV(i, j ,bi,bj)
82         &     *_recip_dyU(i, j ,bi,bj)
83         &     +hFacZClosedN*dxV(i,j+1,bi,bj)
84         &     *_recip_dyU(i,j+1,bi,bj)
85         &    )*drF(k)*2.*uFld(i,j)
86         &     *_maskW(i,j,k,bi,bj)
87           ENDDO
88          ENDDO
89          ENDIF
90    
91          RETURN
92          END
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