| 1 |
C $Header: /u/gcmpack/MITgcm/model/src/calc_div_ghat.F,v 1.25 2009/09/27 23:18:53 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "CPP_OPTIONS.h" |
| 5 |
|
| 6 |
CBOP |
| 7 |
C !ROUTINE: CALC_DIV_GHAT |
| 8 |
C !INTERFACE: |
| 9 |
SUBROUTINE CALC_DIV_GHAT( |
| 10 |
I bi,bj,k, |
| 11 |
U cg2d_b, cg3d_b, |
| 12 |
I myThid) |
| 13 |
C !DESCRIPTION: \bv |
| 14 |
C *==========================================================* |
| 15 |
C | S/R CALC_DIV_GHAT |
| 16 |
C | o Form the right hand-side of the surface pressure eqn. |
| 17 |
C *==========================================================* |
| 18 |
C | Right hand side of pressure equation is divergence |
| 19 |
C | of veclocity tendency (GHAT) term along with a relaxation |
| 20 |
C | term equal to the barotropic flow field divergence. |
| 21 |
C *==========================================================* |
| 22 |
C \ev |
| 23 |
|
| 24 |
C !USES: |
| 25 |
IMPLICIT NONE |
| 26 |
C == Global variables == |
| 27 |
#include "SIZE.h" |
| 28 |
#include "EEPARAMS.h" |
| 29 |
#include "PARAMS.h" |
| 30 |
#include "GRID.h" |
| 31 |
#include "DYNVARS.h" |
| 32 |
|
| 33 |
C !INPUT/OUTPUT PARAMETERS: |
| 34 |
C == Routine arguments == |
| 35 |
C bi, bj :: tile indices |
| 36 |
C k :: Index of layer. |
| 37 |
C cg2d_b :: Conjugate Gradient 2-D solver : Right-hand side vector |
| 38 |
C cg3d_b :: Conjugate Gradient 3-D solver : Right-hand side vector |
| 39 |
C myThid :: Instance number for this call of CALC_DIV_GHAT |
| 40 |
INTEGER bi,bj |
| 41 |
INTEGER k |
| 42 |
_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 43 |
#ifdef ALLOW_NONHYDROSTATIC |
| 44 |
_RL cg3d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
| 45 |
#else |
| 46 |
_RL cg3d_b(1) |
| 47 |
#endif |
| 48 |
INTEGER myThid |
| 49 |
|
| 50 |
C !LOCAL VARIABLES: |
| 51 |
C == Local variables == |
| 52 |
C i,j :: Loop counters |
| 53 |
C xA, yA :: Cell vertical face areas |
| 54 |
C pf :: Intermediate array for building RHS source term. |
| 55 |
INTEGER i,j |
| 56 |
_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 57 |
_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 58 |
_RL pf (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 59 |
CEOP |
| 60 |
|
| 61 |
C Calculate vertical face areas |
| 62 |
DO j=1,sNy+1 |
| 63 |
DO i=1,sNx+1 |
| 64 |
xA(i,j) = _dyG(i,j,bi,bj)*deepFacC(k) |
| 65 |
& *drF(k)*_hFacW(i,j,k,bi,bj)*rhoFacC(k) |
| 66 |
yA(i,j) = _dxG(i,j,bi,bj)*deepFacC(k) |
| 67 |
& *drF(k)*_hFacS(i,j,k,bi,bj)*rhoFacC(k) |
| 68 |
ENDDO |
| 69 |
ENDDO |
| 70 |
|
| 71 |
C-- Pressure equation source term |
| 72 |
C Term is the vertical integral of the divergence of the |
| 73 |
C time tendency terms along with a relaxation term that |
| 74 |
C pulls div(U) + dh/dt back toward zero. |
| 75 |
|
| 76 |
IF (implicDiv2Dflow.EQ.1.) THEN |
| 77 |
C Fully Implicit treatment of the Barotropic Flow Divergence |
| 78 |
DO j=1,sNy |
| 79 |
DO i=1,sNx+1 |
| 80 |
pf(i,j) = xA(i,j)*gU(i,j,k,bi,bj) / deltaTmom |
| 81 |
ENDDO |
| 82 |
ENDDO |
| 83 |
ELSEIF (exactConserv) THEN |
| 84 |
c ELSEIF (nonlinFreeSurf.GT.0) THEN |
| 85 |
C Implicit treatment of the Barotropic Flow Divergence |
| 86 |
DO j=1,sNy |
| 87 |
DO i=1,sNx+1 |
| 88 |
pf(i,j) = implicDiv2Dflow |
| 89 |
& *xA(i,j)*gU(i,j,k,bi,bj) / deltaTmom |
| 90 |
ENDDO |
| 91 |
ENDDO |
| 92 |
ELSE |
| 93 |
C Explicit+Implicit part of the Barotropic Flow Divergence |
| 94 |
C => Filtering of uVel,vVel is necessary |
| 95 |
C-- Now the filter are applied in the_correction_step(). |
| 96 |
C We have left this code here to indicate where the filters used to be |
| 97 |
C in the algorithm before JMC moved them to after the pressure solver. |
| 98 |
c#ifdef ALLOW_ZONAL_FILT |
| 99 |
c IF (zonal_filt_lat.LT.90.) THEN |
| 100 |
c CALL ZONAL_FILTER( |
| 101 |
c U uVel( 1-OLx,1-OLy,k,bi,bj), |
| 102 |
c I hFacW(1-OLx,1-OLy,k,bi,bj), |
| 103 |
c I 0, sNy+1, 1, bi, bj, 1, myThid ) |
| 104 |
c CALL ZONAL_FILTER( |
| 105 |
c U vVel( 1-OLx,1-OLy,k,bi,bj), |
| 106 |
c I hFacS(1-OLx,1-OLy,k,bi,bj), |
| 107 |
c I 0, sNy+1, 1, bi, bj, 2, myThid ) |
| 108 |
c ENDIF |
| 109 |
c#endif |
| 110 |
DO j=1,sNy |
| 111 |
DO i=1,sNx+1 |
| 112 |
pf(i,j) = ( implicDiv2Dflow * gU(i,j,k,bi,bj) |
| 113 |
& + (1. _d 0-implicDiv2Dflow)* uVel(i,j,k,bi,bj) |
| 114 |
& ) * xA(i,j) / deltaTmom |
| 115 |
ENDDO |
| 116 |
ENDDO |
| 117 |
ENDIF |
| 118 |
DO j=1,sNy |
| 119 |
DO i=1,sNx |
| 120 |
cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj) + |
| 121 |
& pf(i+1,j)-pf(i,j) |
| 122 |
ENDDO |
| 123 |
ENDDO |
| 124 |
|
| 125 |
#ifdef ALLOW_NONHYDROSTATIC |
| 126 |
IF (use3Dsolver) THEN |
| 127 |
DO j=1,sNy |
| 128 |
DO i=1,sNx |
| 129 |
cg3d_b(i,j,k,bi,bj) = ( pf(i+1,j)-pf(i,j) ) |
| 130 |
ENDDO |
| 131 |
ENDDO |
| 132 |
ENDIF |
| 133 |
#endif |
| 134 |
|
| 135 |
IF (implicDiv2Dflow.EQ.1.) THEN |
| 136 |
C Fully Implicit treatment of the Barotropic Flow Divergence |
| 137 |
DO j=1,sNy+1 |
| 138 |
DO i=1,sNx |
| 139 |
pf(i,j) = yA(i,j)*gV(i,j,k,bi,bj) / deltatmom |
| 140 |
ENDDO |
| 141 |
ENDDO |
| 142 |
ELSEIF (exactConserv) THEN |
| 143 |
c ELSEIF (nonlinFreeSurf.GT.0) THEN |
| 144 |
C Implicit treatment of the Barotropic Flow Divergence |
| 145 |
DO j=1,sNy+1 |
| 146 |
DO i=1,sNx |
| 147 |
pf(i,j) = implicDiv2Dflow |
| 148 |
& *yA(i,j)*gV(i,j,k,bi,bj) / deltatmom |
| 149 |
ENDDO |
| 150 |
ENDDO |
| 151 |
ELSE |
| 152 |
C Explicit+Implicit part of the Barotropic Flow Divergence |
| 153 |
DO j=1,sNy+1 |
| 154 |
DO i=1,sNx |
| 155 |
pf(i,j) = ( implicDiv2Dflow * gV(i,j,k,bi,bj) |
| 156 |
& + (1. _d 0-implicDiv2Dflow)* vVel(i,j,k,bi,bj) |
| 157 |
& ) * yA(i,j) / deltaTmom |
| 158 |
ENDDO |
| 159 |
ENDDO |
| 160 |
ENDIF |
| 161 |
DO j=1,sNy |
| 162 |
DO i=1,sNx |
| 163 |
cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj) + |
| 164 |
& pf(i,j+1)-pf(i,j) |
| 165 |
ENDDO |
| 166 |
ENDDO |
| 167 |
|
| 168 |
#ifdef ALLOW_NONHYDROSTATIC |
| 169 |
IF (use3Dsolver) THEN |
| 170 |
DO j=1,sNy |
| 171 |
DO i=1,sNx |
| 172 |
cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj) |
| 173 |
& + ( pf(i,j+1)-pf(i,j) ) |
| 174 |
ENDDO |
| 175 |
ENDDO |
| 176 |
ENDIF |
| 177 |
#endif |
| 178 |
|
| 179 |
#ifdef ALLOW_ADDFLUID |
| 180 |
IF ( selectAddFluid.GE.1 ) THEN |
| 181 |
DO j=1,sNy |
| 182 |
DO i=1,sNx |
| 183 |
cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj) |
| 184 |
& - addMass(i,j,k,bi,bj)*mass2rUnit/deltaTmom |
| 185 |
ENDDO |
| 186 |
ENDDO |
| 187 |
#ifdef ALLOW_NONHYDROSTATIC |
| 188 |
IF (use3Dsolver) THEN |
| 189 |
DO j=1,sNy |
| 190 |
DO i=1,sNx |
| 191 |
cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj) |
| 192 |
& - addMass(i,j,k,bi,bj)*mass2rUnit/deltaTmom |
| 193 |
ENDDO |
| 194 |
ENDDO |
| 195 |
ENDIF |
| 196 |
#endif |
| 197 |
ENDIF |
| 198 |
#endif /* ALLOW_ADDFLUID */ |
| 199 |
|
| 200 |
RETURN |
| 201 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph