| 1 |
C $Header: /u/gcmpack/MITgcm/model/src/timestep.F,v 1.36 2004/11/10 03:02:00 jmc Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "PACKAGES_CONFIG.h" |
| 5 |
#include "CPP_OPTIONS.h" |
| 6 |
|
| 7 |
CBOP |
| 8 |
C !ROUTINE: TIMESTEP |
| 9 |
C !INTERFACE: |
| 10 |
SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax, k, |
| 11 |
I dPhiHydX,dPhiHydY, phiSurfX, phiSurfY, |
| 12 |
I guDissip, gvDissip, |
| 13 |
I myTime, myIter, myThid ) |
| 14 |
C !DESCRIPTION: \bv |
| 15 |
C *==========================================================* |
| 16 |
C | S/R TIMESTEP |
| 17 |
C | o Step model fields forward in time |
| 18 |
C *==========================================================* |
| 19 |
C \ev |
| 20 |
|
| 21 |
C !USES: |
| 22 |
IMPLICIT NONE |
| 23 |
C == Global variables == |
| 24 |
#include "SIZE.h" |
| 25 |
#include "DYNVARS.h" |
| 26 |
#include "EEPARAMS.h" |
| 27 |
#include "PARAMS.h" |
| 28 |
#include "GRID.h" |
| 29 |
#include "SURFACE.h" |
| 30 |
|
| 31 |
C !INPUT/OUTPUT PARAMETERS: |
| 32 |
C == Routine Arguments == |
| 33 |
C dPhiHydX,Y :: Gradient (X & Y directions) of Hydrostatic Potential |
| 34 |
C phiSurfX :: gradient of Surface potential (Pressure/rho, ocean) |
| 35 |
C phiSurfY :: or geopotential (atmos) in X and Y direction |
| 36 |
C guDissip :: dissipation tendency (all explicit terms), u component |
| 37 |
C gvDissip :: dissipation tendency (all explicit terms), v component |
| 38 |
|
| 39 |
INTEGER bi,bj,iMin,iMax,jMin,jMax |
| 40 |
INTEGER k |
| 41 |
_RL dPhiHydX(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
| 42 |
_RL dPhiHydY(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
| 43 |
_RL phiSurfX(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 44 |
_RL phiSurfY(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 45 |
_RL guDissip(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 46 |
_RL gvDissip(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 47 |
_RL myTime |
| 48 |
INTEGER myIter, myThid |
| 49 |
|
| 50 |
C !LOCAL VARIABLES: |
| 51 |
C == Local variables == |
| 52 |
LOGICAL momForcing_In_AB |
| 53 |
LOGICAL momDissip_In_AB |
| 54 |
INTEGER i,j |
| 55 |
_RL ab15,ab05 |
| 56 |
_RL phxFac,phyFac, psFac |
| 57 |
_RL gUtmp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 58 |
_RL gVtmp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 59 |
#ifdef ALLOW_CD_CODE |
| 60 |
_RL guCor(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 61 |
_RL gvCor(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 62 |
#endif |
| 63 |
CEOP |
| 64 |
|
| 65 |
C Adams-Bashforth timestepping weights |
| 66 |
IF (myIter .EQ. 0) THEN |
| 67 |
ab15=1.0 |
| 68 |
ab05=0.0 |
| 69 |
ELSE |
| 70 |
ab15=1.5+abeps |
| 71 |
ab05=-0.5-abeps |
| 72 |
ENDIF |
| 73 |
|
| 74 |
C-- explicit part of the surface potential gradient is added in this S/R |
| 75 |
psFac = pfFacMom*(1. _d 0 - implicSurfPress) |
| 76 |
|
| 77 |
C-- including or excluding momentum forcing from Adams-Bashforth: |
| 78 |
momForcing_In_AB = forcing_In_AB |
| 79 |
momForcing_In_AB = .TRUE. |
| 80 |
momDissip_In_AB = .TRUE. |
| 81 |
|
| 82 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 83 |
|
| 84 |
C- Initialize local arrays (not really necessary but safer) |
| 85 |
DO j=1-Oly,sNy+Oly |
| 86 |
DO i=1-Olx,sNx+Olx |
| 87 |
gUtmp(i,j) = 0. _d 0 |
| 88 |
gVtmp(i,j) = 0. _d 0 |
| 89 |
#ifdef ALLOW_CD_CODE |
| 90 |
guCor(i,j) = 0. _d 0 |
| 91 |
gvCor(i,j) = 0. _d 0 |
| 92 |
#endif |
| 93 |
ENDDO |
| 94 |
ENDDO |
| 95 |
|
| 96 |
C-- Stagger time step: grad Phi_Hyp will be added later |
| 97 |
IF (staggerTimeStep) THEN |
| 98 |
phxFac = pfFacMom |
| 99 |
phyFac = pfFacMom |
| 100 |
ELSE |
| 101 |
C-- Synchronous time step: add grad Phi_Hyp to gU,gV before doing Adams-Bashforth |
| 102 |
C note: already done in S/R mom_vecinv and mom_fluxform but would be better |
| 103 |
C to add it to gU,gV here. |
| 104 |
c DO j=jMin,jMax |
| 105 |
c DO i=iMin,iMax |
| 106 |
c gU(i,j,k,bi,bj) = gU(i,j,k,bi,bj) - pfFacMom*dPhiHydX(i,j) |
| 107 |
c gV(i,j,k,bi,bj) = gV(i,j,k,bi,bj) - pfFacMom*dPhiHydY(i,j) |
| 108 |
c ENDDO |
| 109 |
c ENDDO |
| 110 |
phxFac = 0. |
| 111 |
phyFac = 0. |
| 112 |
ENDIF |
| 113 |
|
| 114 |
#ifdef ALLOW_MOM_VECINV |
| 115 |
C-- Dissipation term inside the Adams-Bashforth: |
| 116 |
C note: already in gU,gV if using fluxform |
| 117 |
IF ( momViscosity .AND. momDissip_In_AB |
| 118 |
& .AND. vectorInvariantMomentum ) THEN |
| 119 |
DO j=jMin,jMax |
| 120 |
DO i=iMin,iMax |
| 121 |
gU(i,j,k,bi,bj) = gU(i,j,k,bi,bj) + guDissip(i,j) |
| 122 |
gV(i,j,k,bi,bj) = gV(i,j,k,bi,bj) + gvDissip(i,j) |
| 123 |
ENDDO |
| 124 |
ENDDO |
| 125 |
ENDIF |
| 126 |
#endif |
| 127 |
|
| 128 |
C-- Forcing term inside the Adams-Bashforth: |
| 129 |
IF (momForcing .AND. momForcing_In_AB) THEN |
| 130 |
CALL EXTERNAL_FORCING_U( |
| 131 |
I iMin,iMax,jMin,jMax,bi,bj,k, |
| 132 |
I myTime,myThid) |
| 133 |
CALL EXTERNAL_FORCING_V( |
| 134 |
I iMin,iMax,jMin,jMax,bi,bj,k, |
| 135 |
I myTime,myThid) |
| 136 |
ENDIF |
| 137 |
|
| 138 |
IF (useCDscheme) THEN |
| 139 |
C- for CD-scheme, store gU,Vtmp = gU,V^n + forcing |
| 140 |
DO j=jMin,jMax |
| 141 |
DO i=iMin,iMax |
| 142 |
gUtmp(i,j) = gU(i,j,k,bi,bj) |
| 143 |
gVtmp(i,j) = gV(i,j,k,bi,bj) |
| 144 |
ENDDO |
| 145 |
ENDDO |
| 146 |
ENDIF |
| 147 |
|
| 148 |
C- Compute effective gU,gV_[n+1/2] terms (including Adams-Bashforth weights) |
| 149 |
C and save gU,gV_[n] into guNm1,gvNm1 for the next time step. |
| 150 |
#ifdef ALLOW_ADAMSBASHFORTH_3 |
| 151 |
CALL ADAMS_BASHFORTH3( |
| 152 |
I bi, bj, k, |
| 153 |
U gU, guNm, |
| 154 |
I myIter, myThid ) |
| 155 |
CALL ADAMS_BASHFORTH3( |
| 156 |
I bi, bj, k, |
| 157 |
U gV, gvNm, |
| 158 |
I myIter, myThid ) |
| 159 |
#else /* ALLOW_ADAMSBASHFORTH_3 */ |
| 160 |
CALL ADAMS_BASHFORTH2( |
| 161 |
I bi, bj, k, |
| 162 |
U gU, guNm1, |
| 163 |
I myIter, myThid ) |
| 164 |
CALL ADAMS_BASHFORTH2( |
| 165 |
I bi, bj, k, |
| 166 |
U gV, gvNm1, |
| 167 |
I myIter, myThid ) |
| 168 |
#endif /* ALLOW_ADAMSBASHFORTH_3 */ |
| 169 |
|
| 170 |
C-- Forcing term outside the Adams-Bashforth: |
| 171 |
C (not recommanded with CD-scheme ON) |
| 172 |
IF (momForcing .AND. .NOT.momForcing_In_AB) THEN |
| 173 |
IF (useCDscheme) THEN |
| 174 |
DO j=jMin,jMax |
| 175 |
DO i=iMin,iMax |
| 176 |
gUtmp(i,j) = gUtmp(i,j) - gU(i,j,k,bi,bj) |
| 177 |
gVtmp(i,j) = gVtmp(i,j) - gV(i,j,k,bi,bj) |
| 178 |
ENDDO |
| 179 |
ENDDO |
| 180 |
ENDIF |
| 181 |
CALL EXTERNAL_FORCING_U( |
| 182 |
I iMin,iMax,jMin,jMax,bi,bj,k, |
| 183 |
I myTime,myThid) |
| 184 |
CALL EXTERNAL_FORCING_V( |
| 185 |
I iMin,iMax,jMin,jMax,bi,bj,k, |
| 186 |
I myTime,myThid) |
| 187 |
|
| 188 |
C- for CD-scheme, compute gU,Vtmp = gU,V^n + forcing |
| 189 |
IF (useCDscheme) THEN |
| 190 |
DO j=jMin,jMax |
| 191 |
DO i=iMin,iMax |
| 192 |
gUtmp(i,j) = gUtmp(i,j) + gU(i,j,k,bi,bj) |
| 193 |
gVtmp(i,j) = gVtmp(i,j) + gV(i,j,k,bi,bj) |
| 194 |
ENDDO |
| 195 |
ENDDO |
| 196 |
ENDIF |
| 197 |
ENDIF |
| 198 |
|
| 199 |
#ifdef ALLOW_CD_CODE |
| 200 |
IF (useCDscheme) THEN |
| 201 |
C- Step forward D-grid velocity using C-grid gU,Vtmp = gU,V^n + forcing |
| 202 |
C and return coriolis terms on C-grid (guCor,gvCor) |
| 203 |
CALL CD_CODE_SCHEME( |
| 204 |
I bi,bj,k, dPhiHydX,dPhiHydY, gUtmp,gVtmp, |
| 205 |
O guCor,gvCor, |
| 206 |
I myTime, myIter, myThid) |
| 207 |
DO j=jMin,jMax |
| 208 |
DO i=iMin,iMax |
| 209 |
gUtmp(i,j) = gU(i,j,k,bi,bj) |
| 210 |
& + guCor(i,j) |
| 211 |
gVtmp(i,j) = gV(i,j,k,bi,bj) |
| 212 |
& + gvCor(i,j) |
| 213 |
ENDDO |
| 214 |
ENDDO |
| 215 |
ELSE |
| 216 |
#endif /* ALLOW_CD_CODE */ |
| 217 |
DO j=jMin,jMax |
| 218 |
DO i=iMin,iMax |
| 219 |
gUtmp(i,j) = gU(i,j,k,bi,bj) |
| 220 |
gVtmp(i,j) = gV(i,j,k,bi,bj) |
| 221 |
ENDDO |
| 222 |
ENDDO |
| 223 |
#ifdef ALLOW_CD_CODE |
| 224 |
ENDIF |
| 225 |
#endif |
| 226 |
|
| 227 |
#ifdef NONLIN_FRSURF |
| 228 |
IF (.NOT. vectorInvariantMomentum |
| 229 |
& .AND. nonlinFreeSurf.GT.1) THEN |
| 230 |
IF (select_rStar.GT.0) THEN |
| 231 |
DO j=jMin,jMax |
| 232 |
DO i=iMin,iMax |
| 233 |
gUtmp(i,j) = gUtmp(i,j)/rStarExpW(i,j,bi,bj) |
| 234 |
gVtmp(i,j) = gVtmp(i,j)/rStarExpS(i,j,bi,bj) |
| 235 |
ENDDO |
| 236 |
ENDDO |
| 237 |
ELSE |
| 238 |
DO j=jMin,jMax |
| 239 |
DO i=iMin,iMax |
| 240 |
IF ( k.EQ.ksurfW(i,j,bi,bj) ) THEN |
| 241 |
gUtmp(i,j) = gUtmp(i,j) |
| 242 |
& *hFacW(i,j,k,bi,bj)/hFac_surfW(i,j,bi,bj) |
| 243 |
ENDIF |
| 244 |
IF ( k.EQ.ksurfS(i,j,bi,bj) ) THEN |
| 245 |
gVtmp(i,j) = gVtmp(i,j) |
| 246 |
& *hFacS(i,j,k,bi,bj)/hFac_surfS(i,j,bi,bj) |
| 247 |
ENDIF |
| 248 |
ENDDO |
| 249 |
ENDDO |
| 250 |
ENDIF |
| 251 |
ENDIF |
| 252 |
#endif /* NONLIN_FRSURF */ |
| 253 |
|
| 254 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 255 |
|
| 256 |
#ifdef ALLOW_MOM_VECINV |
| 257 |
C-- Dissipation term outside the Adams-Bashforth: |
| 258 |
C note: only implemented with vecinv formulation |
| 259 |
IF ( momViscosity .AND. .NOT.momDissip_In_AB |
| 260 |
& .AND. vectorInvariantMomentum ) THEN |
| 261 |
DO j=jMin,jMax |
| 262 |
DO i=iMin,iMax |
| 263 |
gUtmp(i,j) = gUtmp(i,j) + guDissip(i,j) |
| 264 |
gVtmp(i,j) = gVtmp(i,j) + gvDissip(i,j) |
| 265 |
ENDDO |
| 266 |
ENDDO |
| 267 |
ENDIF |
| 268 |
#endif |
| 269 |
|
| 270 |
C Step forward zonal velocity (store in Gu) |
| 271 |
DO j=jMin,jMax |
| 272 |
DO i=iMin,iMax |
| 273 |
gU(i,j,k,bi,bj) = uVel(i,j,k,bi,bj) |
| 274 |
& +deltaTmom*( |
| 275 |
& gUtmp(i,j) |
| 276 |
& - psFac*phiSurfX(i,j) |
| 277 |
& - phxFac*dPhiHydX(i,j) |
| 278 |
& )*_maskW(i,j,k,bi,bj) |
| 279 |
ENDDO |
| 280 |
ENDDO |
| 281 |
|
| 282 |
C Step forward meridional velocity (store in Gv) |
| 283 |
DO j=jMin,jMax |
| 284 |
DO i=iMin,iMax |
| 285 |
gV(i,j,k,bi,bj) = vVel(i,j,k,bi,bj) |
| 286 |
& +deltaTmom*( |
| 287 |
& gVtmp(i,j) |
| 288 |
& - psFac*phiSurfY(i,j) |
| 289 |
& - phyFac*dPhiHydY(i,j) |
| 290 |
& )*_maskS(i,j,k,bi,bj) |
| 291 |
ENDDO |
| 292 |
ENDDO |
| 293 |
|
| 294 |
RETURN |
| 295 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph