| 1 |
C $Header: /u/u0/gcmpack/MITgcm/pkg/mom_fluxform/mom_u_sidedrag.F,v 1.3 2001/09/26 19:05:21 adcroft Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "CPP_OPTIONS.h" |
| 5 |
|
| 6 |
CBOP |
| 7 |
C !ROUTINE: MOM_U_SIDEDRAG |
| 8 |
|
| 9 |
C !INTERFACE: ========================================================== |
| 10 |
SUBROUTINE MOM_U_SIDEDRAG( |
| 11 |
I bi,bj,k, |
| 12 |
I uFld, del2u, hFacZ, |
| 13 |
O uDragTerms, |
| 14 |
I myThid) |
| 15 |
|
| 16 |
C !DESCRIPTION: |
| 17 |
C Calculates the drag terms due to the no-slip condition on viscous stresses: |
| 18 |
C \begin{equation*} |
| 19 |
C G^u_{drag} = - \frac{2}{\Delta y_u} (A_h u - A_4 \nabla^2 u) |
| 20 |
C \end{equation*} |
| 21 |
|
| 22 |
C !USES: =============================================================== |
| 23 |
IMPLICIT NONE |
| 24 |
#include "SIZE.h" |
| 25 |
#include "EEPARAMS.h" |
| 26 |
#include "PARAMS.h" |
| 27 |
#include "GRID.h" |
| 28 |
|
| 29 |
C !INPUT PARAMETERS: =================================================== |
| 30 |
C bi,bj :: tile indices |
| 31 |
C k :: vertical level |
| 32 |
C uFld :: zonal flow |
| 33 |
C del2u :: Laplacian of zonal flow |
| 34 |
C hFacZ :: fractional open water at vorticity points |
| 35 |
C myThid :: thread number |
| 36 |
INTEGER bi,bj,k |
| 37 |
_RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 38 |
_RL del2u(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 39 |
_RS hFacZ(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 40 |
INTEGER myThid |
| 41 |
|
| 42 |
C !OUTPUT PARAMETERS: ================================================== |
| 43 |
C uDragTerms :: drag term |
| 44 |
_RL uDragTerms(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 45 |
|
| 46 |
C !LOCAL VARIABLES: ==================================================== |
| 47 |
C i,j :: loop indices |
| 48 |
C hFacZClosedN :: fractional open water to north |
| 49 |
C hFacZClosedS :: fractional open water to south |
| 50 |
INTEGER I,J |
| 51 |
_RS hFacZClosedS,hFacZClosedN |
| 52 |
_RS gridScalingA4 |
| 53 |
CEOP |
| 54 |
|
| 55 |
C - Laplacian and bi-harmonic terms |
| 56 |
DO j=1-Oly,sNy+Oly-1 |
| 57 |
DO i=1-Olx,sNx+Olx-1 |
| 58 |
hFacZClosedS = _hFacW(i,j,k,bi,bj) - hFacZ(i,j) |
| 59 |
hFacZClosedN = _hFacW(i,j,k,bi,bj) - hFacZ(i,j+1) |
| 60 |
gridScalingA4 = (_dyU(i, j ,bi,bj)**4)/(5000.**4) ! Realy should split this loop for a more precise formulation |
| 61 |
uDragTerms(i,j) = |
| 62 |
& -_recip_hFacW(i,j,k,bi,bj) |
| 63 |
& *recip_drF(k)*recip_rAw(i,j,bi,bj) |
| 64 |
& *( hFacZClosedS*_dxV(i, j ,bi,bj) |
| 65 |
& *_recip_dyU(i, j ,bi,bj) |
| 66 |
& +hFacZClosedN*_dxV(i,j+1,bi,bj) |
| 67 |
& *_recip_dyU(i,j+1,bi,bj) ) |
| 68 |
& *drF(k)*2.*( |
| 69 |
#ifdef ISOTROPIC_COS_SCALING |
| 70 |
& viscAh*uFld(i,j)*cosFacU(J,bi,bj) |
| 71 |
#ifdef COSINEMETH_III |
| 72 |
& -viscA4*del2u(i,j)*sqcosFacU(J,bi,bj) |
| 73 |
#else |
| 74 |
& -viscA4*del2u(i,j)*cosFacU(J,bi,bj) |
| 75 |
#endif |
| 76 |
#else |
| 77 |
& viscAh*uFld(i,j) |
| 78 |
& -viscA4*del2u(i,j)*gridScalingA4 |
| 79 |
#endif |
| 80 |
& ) |
| 81 |
ENDDO |
| 82 |
ENDDO |
| 83 |
|
| 84 |
RETURN |
| 85 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph