model/src/solve_for_pressure.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.19.2.4 2001/05/16 21:05:10 jmc Exp $
C $Name:  $

#include "CPP_OPTIONS.h"

CStartOfInterface
      SUBROUTINE SOLVE_FOR_PRESSURE( myThid )
C     /==========================================================\
C     | SUBROUTINE SOLVE_FOR_PRESSURE                            |
C     | o Controls inversion of two and/or three-dimensional     |
C     |   elliptic problems for the pressure field.              |
C     \==========================================================/
      IMPLICIT NONE

C     == Global variables
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "DYNVARS.h"
#include "GRID.h"
#include "SURFACE.h"
#ifdef ALLOW_NONHYDROSTATIC
#include "CG3D.h"
#include "GW.h"
#endif
#ifdef ALLOW_OBCS
#include "OBCS.h"
#endif
#include "SOLVE_FOR_PRESSURE.h"

C     == Routine arguments ==
C     myThid - Number of this instance of SOLVE_FOR_PRESSURE
      INTEGER myThid
CEndOfInterface

C     == Local variables ==
      INTEGER i,j,k,bi,bj
      _RS uf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
      _RS vf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
      _RL firstResidual,lastResidual
      INTEGER numIters

C--   Save previous solution & Initialise Vector solution and source term :
      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
        DO j=1-OLy,sNy+OLy
         DO i=1-OLx,sNx+OLx
          etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
          cg2d_x(i,j,bi,bj) = Bo_surf(i,j,bi,bj)*etaN(i,j,bi,bj)
          cg2d_b(i,j,bi,bj) = 0.
#ifdef USE_NATURAL_BCS
     &     + freeSurfFac*_rA(i,j,bi,bj)*
     &       EmPmR(I,J,bi,bj)/deltaTMom
#endif
         ENDDO
        ENDDO
       ENDDO
      ENDDO

      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
        DO K=Nr,1,-1
         DO j=1,sNy+1
          DO i=1,sNx+1
           uf(i,j) = _dyG(i,j,bi,bj)
     &      *drF(k)*_hFacW(i,j,k,bi,bj)
           vf(i,j) = _dxG(i,j,bi,bj)
     &      *drF(k)*_hFacS(i,j,k,bi,bj)
          ENDDO
         ENDDO
         CALL CALC_DIV_GHAT(
     I       bi,bj,1,sNx,1,sNy,K,
     I       uf,vf,
     U       cg2d_b,
     I       myThid)
        ENDDO
       ENDDO
      ENDDO

C--   Add source term arising from w=d/dt (p_s + p_nh)
      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
#ifdef ALLOW_NONHYDROSTATIC
        DO j=1,sNy
         DO i=1,sNx
          cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
     &      -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
     &        *( etaN(i,j,bi,bj)
     &          +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
          cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
     &      -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
     &        *( etaN(i,j,bi,bj)
     &          +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
C-jmc
c    &      -freeSurfFac*_rA(i,j,bi,bj)*recip_Bo(i,j,bi,bj)
c    &        *( cg2d_x(i,j,bi,bj) + cg3d_x(i,j,1,bi,bj) )
c    &        /deltaTMom/deltaTMom
C-jmc
         ENDDO
        ENDDO
#else
        DO j=1,sNy
         DO i=1,sNx
          cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
     &      -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
     &        * etaN(i,j,bi,bj)
         ENDDO
        ENDDO
#endif

#ifdef ALLOW_OBCS
        IF (useOBCS) THEN
         DO i=1,sNx
C Northern boundary
          IF (OB_Jn(I,bi,bj).NE.0) THEN
           cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
          ENDIF
C Southern boundary
          IF (OB_Js(I,bi,bj).NE.0) THEN
           cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
          ENDIF
         ENDDO
         DO j=1,sNy
C Eastern boundary
          IF (OB_Ie(J,bi,bj).NE.0) THEN
           cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
          ENDIF
C Western boundary
          IF (OB_Iw(J,bi,bj).NE.0) THEN
           cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
          ENDIF
         ENDDO
        ENDIF
#endif
       ENDDO
      ENDDO


C--   Find the surface pressure using a two-dimensional conjugate
C--   gradient solver.
C     see CG2D.h for the interface to this routine.
      firstResidual=0.
      lastResidual=0.
      numIters=cg2dMaxIters
      CALL CG2D(
     U           cg2d_b,
     U           cg2d_x,
     O           firstResidual,
     O           lastResidual,
     U           numIters,
     I           myThid )
      _EXCH_XY_R8(cg2d_x, myThid )

      _BEGIN_MASTER( myThid )
       WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
     &                               0, firstResidual
       WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
     &                         numIters, lastResidual
      _END_MASTER( )

C--   Transfert the 2D-solution to "etaN" :
      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
        DO j=1-OLy,sNy+OLy
         DO i=1-OLx,sNx+OLx
          etaN(i,j,bi,bj) = recip_Bo(i,j,bi,bj)*cg2d_x(i,j,bi,bj)
         ENDDO
        ENDDO
       ENDDO
      ENDDO

#ifdef ALLOW_NONHYDROSTATIC
      IF ( nonHydrostatic ) THEN

C--   Solve for a three-dimensional pressure term (NH or IGW or both ).
C     see CG3D.h for the interface to this routine.
       DO bj=myByLo(myThid),myByHi(myThid)
        DO bi=myBxLo(myThid),myBxHi(myThid)
         DO j=1,sNy+1
          DO i=1,sNx+1
           uf(i,j)=-_recip_dxC(i,j,bi,bj)*
     &         (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
           vf(i,j)=-_recip_dyC(i,j,bi,bj)*
     &         (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
          ENDDO
         ENDDO

#ifdef ALLOW_OBCS
         IF (useOBCS) THEN
          DO i=1,sNx+1
C Northern boundary
          IF (OB_Jn(I,bi,bj).NE.0) THEN
           vf(I,OB_Jn(I,bi,bj))=0.
          ENDIF
C Southern boundary
          IF (OB_Js(I,bi,bj).NE.0) THEN
           vf(I,OB_Js(I,bi,bj)+1)=0.
          ENDIF
          ENDDO
          DO j=1,sNy+1
C Eastern boundary
          IF (OB_Ie(J,bi,bj).NE.0) THEN
           uf(OB_Ie(J,bi,bj),J)=0.
          ENDIF
C Western boundary
          IF (OB_Iw(J,bi,bj).NE.0) THEN
           uf(OB_Iw(J,bi,bj)+1,J)=0.
          ENDIF
          ENDDO
         ENDIF
#endif

         K=1
         DO j=1,sNy
          DO i=1,sNx
           cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
     &       +dRF(K)*dYG(i+1,j,bi,bj)*hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
     &       -dRF(K)*dYG( i ,j,bi,bj)*hFacW( i ,j,k,bi,bj)*uf( i ,j)
     &       +dRF(K)*dXG(i,j+1,bi,bj)*hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
     &       -dRF(K)*dXG(i, j ,bi,bj)*hFacS(i, j ,k,bi,bj)*vf(i, j )
     &       +( freeSurfFac*etaN(i,j,bi,bj)/deltaTMom
     &          -wVel(i,j,k+1,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom
          ENDDO
         ENDDO
         DO K=2,Nr-1
          DO j=1,sNy
           DO i=1,sNx
            cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
     &       +dRF(K)*dYG(i+1,j,bi,bj)*hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
     &       -dRF(K)*dYG( i ,j,bi,bj)*hFacW( i ,j,k,bi,bj)*uf( i ,j)
     &       +dRF(K)*dXG(i,j+1,bi,bj)*hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
     &       -dRF(K)*dXG(i, j ,bi,bj)*hFacS(i, j ,k,bi,bj)*vf(i, j )
     &       +( wVel(i,j,k  ,bi,bj)
     &         -wVel(i,j,k+1,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom

           ENDDO
          ENDDO
         ENDDO
         K=Nr
         DO j=1,sNy
          DO i=1,sNx
            cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
     &       +dRF(K)*dYG(i+1,j,bi,bj)*hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
     &       -dRF(K)*dYG( i ,j,bi,bj)*hFacW( i ,j,k,bi,bj)*uf( i ,j)
     &       +dRF(K)*dXG(i,j+1,bi,bj)*hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
     &       -dRF(K)*dXG(i, j ,bi,bj)*hFacS(i, j ,k,bi,bj)*vf(i, j )
     &       +( wVel(i,j,k  ,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom

          ENDDO
         ENDDO

#ifdef ALLOW_OBCS
         IF (useOBCS) THEN
          DO K=1,Nr
          DO i=1,sNx
C Northern boundary
          IF (OB_Jn(I,bi,bj).NE.0) THEN
           cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
          ENDIF
C Southern boundary
          IF (OB_Js(I,bi,bj).NE.0) THEN
           cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
          ENDIF
          ENDDO
          DO j=1,sNy
C Eastern boundary
          IF (OB_Ie(J,bi,bj).NE.0) THEN
           cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
          ENDIF
C Western boundary
          IF (OB_Iw(J,bi,bj).NE.0) THEN
           cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
          ENDIF
          ENDDO
          ENDDO
         ENDIF
#endif

        ENDDO ! bi
       ENDDO ! bj

       CALL CG3D( myThid )
       _EXCH_XYZ_R8(cg3d_x, myThid )

      ENDIF
#endif

      RETURN
      END
1	adcroft	1.22	C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.19.2.4 2001/05/16 21:05:10 jmc Exp $
2	heimbach	1.21	C $Name: $
3	cnh	1.1
4	adcroft	1.5	#include "CPP_OPTIONS.h"
5	cnh	1.1
6			CStartOfInterface
7			SUBROUTINE SOLVE_FOR_PRESSURE( myThid )
8			C /==========================================================\
9			C \| SUBROUTINE SOLVE_FOR_PRESSURE \|
10			C \| o Controls inversion of two and/or three-dimensional \|
11			C \| elliptic problems for the pressure field. \|
12			C \==========================================================/
13	adcroft	1.8	IMPLICIT NONE
14	cnh	1.1
15	cnh	1.4	C == Global variables
16			#include "SIZE.h"
17			#include "EEPARAMS.h"
18			#include "PARAMS.h"
19			#include "DYNVARS.h"
20	adcroft	1.12	#include "GRID.h"
21	jmc	1.17	#include "SURFACE.h"
22	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
23			#include "CG3D.h"
24			#include "GW.h"
25	adcroft	1.12	#endif
26	adcroft	1.11	#ifdef ALLOW_OBCS
27	adcroft	1.9	#include "OBCS.h"
28	adcroft	1.11	#endif
29	adcroft	1.22	#include "SOLVE_FOR_PRESSURE.h"
30	cnh	1.4
31	cnh	1.1	C == Routine arguments ==
32			C myThid - Number of this instance of SOLVE_FOR_PRESSURE
33			INTEGER myThid
34			CEndOfInterface
35	cnh	1.4
36	adcroft	1.22	C == Local variables ==
37	cnh	1.6	INTEGER i,j,k,bi,bj
38	adcroft	1.9	_RS uf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
39			_RS vf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
40	adcroft	1.22	_RL firstResidual,lastResidual
41	adcroft	1.19	INTEGER numIters
42	jmc	1.17
43			C-- Save previous solution & Initialise Vector solution and source term :
44			DO bj=myByLo(myThid),myByHi(myThid)
45			DO bi=myBxLo(myThid),myBxHi(myThid)
46			DO j=1-OLy,sNy+OLy
47			DO i=1-OLx,sNx+OLx
48			etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
49	jmc	1.18	cg2d_x(i,j,bi,bj) = Bo_surf(i,j,bi,bj)*etaN(i,j,bi,bj)
50	jmc	1.17	cg2d_b(i,j,bi,bj) = 0.
51			#ifdef USE_NATURAL_BCS
52	jmc	1.18	& + freeSurfFac_rA(i,j,bi,bj)
53	jmc	1.17	& EmPmR(I,J,bi,bj)/deltaTMom
54			#endif
55			ENDDO
56			ENDDO
57			ENDDO
58			ENDDO
59	adcroft	1.12
60			DO bj=myByLo(myThid),myByHi(myThid)
61			DO bi=myBxLo(myThid),myBxHi(myThid)
62			DO K=Nr,1,-1
63			DO j=1,sNy+1
64			DO i=1,sNx+1
65			uf(i,j) = _dyG(i,j,bi,bj)
66			& drF(k)_hFacW(i,j,k,bi,bj)
67			vf(i,j) = _dxG(i,j,bi,bj)
68			& drF(k)_hFacS(i,j,k,bi,bj)
69			ENDDO
70			ENDDO
71			CALL CALC_DIV_GHAT(
72			I bi,bj,1,sNx,1,sNy,K,
73			I uf,vf,
74	jmc	1.17	U cg2d_b,
75	adcroft	1.12	I myThid)
76			ENDDO
77			ENDDO
78			ENDDO
79	cnh	1.4
80	adcroft	1.12	C-- Add source term arising from w=d/dt (p_s + p_nh)
81			DO bj=myByLo(myThid),myByHi(myThid)
82			DO bi=myBxLo(myThid),myBxHi(myThid)
83	adcroft	1.13	#ifdef ALLOW_NONHYDROSTATIC
84	adcroft	1.12	DO j=1,sNy
85			DO i=1,sNx
86			cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
87	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
88			& *( etaN(i,j,bi,bj)
89			& +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
90	adcroft	1.13	cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
91	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
92			& *( etaN(i,j,bi,bj)
93			& +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
94			C-jmc
95			c & -freeSurfFac_rA(i,j,bi,bj)recip_Bo(i,j,bi,bj)
96			c & *( cg2d_x(i,j,bi,bj) + cg3d_x(i,j,1,bi,bj) )
97			c & /deltaTMom/deltaTMom
98			C-jmc
99	adcroft	1.12	ENDDO
100			ENDDO
101	adcroft	1.13	#else
102	adcroft	1.12	DO j=1,sNy
103			DO i=1,sNx
104	adcroft	1.13	cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
105	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
106			& * etaN(i,j,bi,bj)
107	adcroft	1.12	ENDDO
108			ENDDO
109			#endif
110
111			#ifdef ALLOW_OBCS
112	adcroft	1.14	IF (useOBCS) THEN
113	adcroft	1.12	DO i=1,sNx
114			C Northern boundary
115			IF (OB_Jn(I,bi,bj).NE.0) THEN
116			cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
117			ENDIF
118			C Southern boundary
119			IF (OB_Js(I,bi,bj).NE.0) THEN
120			cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
121			ENDIF
122			ENDDO
123			DO j=1,sNy
124			C Eastern boundary
125			IF (OB_Ie(J,bi,bj).NE.0) THEN
126			cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
127			ENDIF
128			C Western boundary
129			IF (OB_Iw(J,bi,bj).NE.0) THEN
130			cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
131			ENDIF
132			ENDDO
133			ENDIF
134			#endif
135			ENDDO
136			ENDDO
137
138
139	cnh	1.1	C-- Find the surface pressure using a two-dimensional conjugate
140			C-- gradient solver.
141	adcroft	1.22	C see CG2D.h for the interface to this routine.
142			firstResidual=0.
143			lastResidual=0.
144	adcroft	1.19	numIters=cg2dMaxIters
145	cnh	1.1	CALL CG2D(
146	adcroft	1.22	U cg2d_b,
147	cnh	1.6	U cg2d_x,
148	adcroft	1.22	O firstResidual,
149			O lastResidual,
150	adcroft	1.19	U numIters,
151	cnh	1.1	I myThid )
152	adcroft	1.19	_EXCH_XY_R8(cg2d_x, myThid )
153	cnh	1.1
154	adcroft	1.19	_BEGIN_MASTER( myThid )
155	heimbach	1.21	WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
156	adcroft	1.22	& 0, firstResidual
157	heimbach	1.21	WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
158	adcroft	1.22	& numIters, lastResidual
159	adcroft	1.19	_END_MASTER( )
160	jmc	1.17
161			C-- Transfert the 2D-solution to "etaN" :
162			DO bj=myByLo(myThid),myByHi(myThid)
163			DO bi=myBxLo(myThid),myBxHi(myThid)
164			DO j=1-OLy,sNy+OLy
165			DO i=1-OLx,sNx+OLx
166	jmc	1.18	etaN(i,j,bi,bj) = recip_Bo(i,j,bi,bj)*cg2d_x(i,j,bi,bj)
167	jmc	1.17	ENDDO
168			ENDDO
169			ENDDO
170			ENDDO
171	adcroft	1.10
172	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
173			IF ( nonHydrostatic ) THEN
174
175			C-- Solve for a three-dimensional pressure term (NH or IGW or both ).
176			C see CG3D.h for the interface to this routine.
177			DO bj=myByLo(myThid),myByHi(myThid)
178			DO bi=myBxLo(myThid),myBxHi(myThid)
179			DO j=1,sNy+1
180			DO i=1,sNx+1
181	jmc	1.18	uf(i,j)=-_recip_dxC(i,j,bi,bj)*
182	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
183	jmc	1.18	vf(i,j)=-_recip_dyC(i,j,bi,bj)*
184	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
185			ENDDO
186			ENDDO
187
188	adcroft	1.12	#ifdef ALLOW_OBCS
189	adcroft	1.14	IF (useOBCS) THEN
190	adcroft	1.9	DO i=1,sNx+1
191			C Northern boundary
192			IF (OB_Jn(I,bi,bj).NE.0) THEN
193			vf(I,OB_Jn(I,bi,bj))=0.
194			ENDIF
195			C Southern boundary
196			IF (OB_Js(I,bi,bj).NE.0) THEN
197			vf(I,OB_Js(I,bi,bj)+1)=0.
198			ENDIF
199			ENDDO
200			DO j=1,sNy+1
201			C Eastern boundary
202			IF (OB_Ie(J,bi,bj).NE.0) THEN
203			uf(OB_Ie(J,bi,bj),J)=0.
204			ENDIF
205			C Western boundary
206			IF (OB_Iw(J,bi,bj).NE.0) THEN
207			uf(OB_Iw(J,bi,bj)+1,J)=0.
208			ENDIF
209			ENDDO
210			ENDIF
211	adcroft	1.12	#endif
212	adcroft	1.9
213	adcroft	1.12	K=1
214			DO j=1,sNy
215			DO i=1,sNx
216			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
217			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
218			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
219			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
220			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
221	jmc	1.18	& +( freeSurfFac*etaN(i,j,bi,bj)/deltaTMom
222			& -wVel(i,j,k+1,bi,bj)
223	adcroft	1.12	& )*_rA(i,j,bi,bj)/deltaTmom
224			ENDDO
225			ENDDO
226			DO K=2,Nr-1
227	adcroft	1.9	DO j=1,sNy
228			DO i=1,sNx
229			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
230			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
231			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
232			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
233			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
234	adcroft	1.12	& +( wVel(i,j,k ,bi,bj)
235			& -wVel(i,j,k+1,bi,bj)
236			& )*_rA(i,j,bi,bj)/deltaTmom
237
238	adcroft	1.9	ENDDO
239			ENDDO
240			ENDDO
241	adcroft	1.12	K=Nr
242			DO j=1,sNy
243			DO i=1,sNx
244			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
245			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
246			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
247			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
248			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
249			& +( wVel(i,j,k ,bi,bj)
250			& )*_rA(i,j,bi,bj)/deltaTmom
251
252			ENDDO
253			ENDDO
254
255			#ifdef ALLOW_OBCS
256	adcroft	1.14	IF (useOBCS) THEN
257	adcroft	1.12	DO K=1,Nr
258			DO i=1,sNx
259			C Northern boundary
260			IF (OB_Jn(I,bi,bj).NE.0) THEN
261			cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
262			ENDIF
263			C Southern boundary
264			IF (OB_Js(I,bi,bj).NE.0) THEN
265			cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
266			ENDIF
267			ENDDO
268			DO j=1,sNy
269			C Eastern boundary
270			IF (OB_Ie(J,bi,bj).NE.0) THEN
271			cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
272			ENDIF
273			C Western boundary
274			IF (OB_Iw(J,bi,bj).NE.0) THEN
275			cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
276			ENDIF
277			ENDDO
278			ENDDO
279			ENDIF
280			#endif
281	adcroft	1.9
282			ENDDO ! bi
283			ENDDO ! bj
284
285			CALL CG3D( myThid )
286	adcroft	1.10	_EXCH_XYZ_R8(cg3d_x, myThid )
287	adcroft	1.9
288			ENDIF
289			#endif
290	cnh	1.1
291			RETURN
292			END