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streamice_cg_solve_matfree.F
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streamice_cg_solve_matfree.F
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C $Header: /u/gcmpack/MITgcm/pkg/streamice/streamice_cg_solve_matfree.F,v 1.1 2013/06/12 21:30:21 dgoldberg Exp $
C $Name: $
#include "STREAMICE_OPTIONS.h"
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
CBOP
SUBROUTINE STREAMICE_CG_SOLVE_MATFREE (
U cg_Uin, ! x-velocities
U cg_Vin, ! y-velocities
I cg_Bu, ! force in x dir
I cg_Bv, ! force in y dir
I tolerance,
O iters,
I myThid )
C /============================================================\
C | SUBROUTINE |
C | o |
C |============================================================|
C | |
C \============================================================/
IMPLICIT NONE
C === Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "STREAMICE.h"
#include "STREAMICE_CG.h"
C !INPUT/OUTPUT ARGUMENTS
C cg_Uin, cg_Vin - input and output velocities
C cg_Bu, cg_Bv - driving stress
INTEGER myThid
INTEGER iters
_RL tolerance
_RL cg_Uin (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL cg_Vin (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL cg_Bu (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL cg_Bv (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
C LOCAL VARIABLES
INTEGER i, j, bi, bj, cg_halo, conv_flag
INTEGER iter, is, js, ie, je, colx, coly, k
_RL dot_p1, dot_p2, alpha_k, beta_k, resid, resid_0
_RL dot_p1_tile (nSx,nSy)
_RL dot_p2_tile (nSx,nSy)
CHARACTER*(MAX_LEN_MBUF) msgBuf
iters = streamice_max_cg_iter
#ifdef ALLOW_STREAMICE
conv_flag = 0
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
Zu_SI (i,j,bi,bj) = 0. _d 0
Zv_SI (i,j,bi,bj) = 0. _d 0
Ru_SI (i,j,bi,bj) = 0. _d 0
Rv_SI (i,j,bi,bj) = 0. _d 0
Au_SI (i,j,bi,bj) = 0. _d 0
Av_SI (i,j,bi,bj) = 0. _d 0
Du_SI (i,j,bi,bj) = 0. _d 0
Dv_SI (i,j,bi,bj) = 0. _d 0
ENDDO
ENDDO
ENDDO
ENDDO
C FIND INITIAL RESIDUAL, and initialize r
! #ifdef STREAMICE_CONSTRUCT_MATRIX
! DO bj = myByLo(myThid), myByHi(myThid)
! DO bi = myBxLo(myThid), myBxHi(myThid)
! DO j=js,je
! DO i=is,ie
! DO colx=-1,1
! DO coly=-1,1
! Au_SI(i,j,bi,bj) = Au_SI(i,j,bi,bj) +
! & streamice_cg_A1(i,j,bi,bj,colx,coly)*
! & cg_Uin(i+colx,j+coly,bi,bj)+
! & streamice_cg_A2(i,j,bi,bj,colx,coly)*
! & cg_Vin(i+colx,j+coly,bi,bj)
! Av_SI(i,j,bi,bj) = Av_SI(i,j,bi,bj) +
! & streamice_cg_A3(i,j,bi,bj,colx,coly)*
! & cg_Uin(i+colx,j+coly,bi,bj)+
! & streamice_cg_A4(i,j,bi,bj,colx,coly)*
! & cg_Vin(i+colx,j+coly,bi,bj)
! ENDDO
! ENDDO
! ENDDO
! ENDDO
! ENDDO
! ENDDO
! #else
CALL STREAMICE_CG_ACTION( myThid,
O Au_SI,
O Av_SI,
I cg_Uin,
I cg_Vin,
I 0, sNx+1, 0, sNy+1 )
! #endif
_EXCH_XY_RL( Au_SI, myThid )
_EXCH_XY_RL( Av_SI, myThid )
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
Ru_SI(i,j,bi,bj)=cg_Bu(i,j,bi,bj)-
& Au_SI(i,j,bi,bj)
Rv_SI(i,j,bi,bj)=cg_Bv(i,j,bi,bj)-
& Av_SI(i,j,bi,bj)
ENDDO
ENDDO
dot_p1_tile(bi,bj) = 0. _d 0
dot_p2_tile(bi,bj) = 0. _d 0
ENDDO
ENDDO
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0)
& dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Ru_SI(i,j,bi,bj)**2
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0)
& dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Rv_SI(i,j,bi,bj)**2
ENDDO
ENDDO
ENDDO
ENDDO
CALL GLOBAL_SUM_TILE_RL( dot_p1_tile, dot_p1, myThid )
resid_0 = sqrt(dot_p1)
C CCCCCCCCCCCCCCCCCCCC
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0)
& Zu_SI(i,j,bi,bj)=Ru_SI(i,j,bi,bj) / DIAGu_SI(i,j,bi,bj)
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0)
& Zv_SI(i,j,bi,bj)=Rv_SI(i,j,bi,bj) / DIAGv_SI(i,j,bi,bj)
ENDDO
ENDDO
ENDDO
ENDDO
cg_halo = min(OLx-1,OLy-1)
conv_flag = 0
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
Du_SI(i,j,bi,bj)=Zu_SI(i,j,bi,bj)
Dv_SI(i,j,bi,bj)=Zv_SI(i,j,bi,bj)
ENDDO
ENDDO
ENDDO
ENDDO
resid = resid_0
iters = 0
c !!!!!!!!!!!!!!!!!!
c !! !!
c !! MAIN CG LOOP !!
c !! !!
c !!!!!!!!!!!!!!!!!!
c ! initially, b-grid data is valid up to 3 halo nodes out -- right? (check for MITgcm!!)
WRITE(msgBuf,'(A)') 'BEGINNING MAIN CG LOOP'
CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
& SQUEEZE_RIGHT , 1)
! IF(STREAMICE_construct_matrix) CALL STREAMICE_CG_MAKE_A(myThid)
do iter = 1, streamice_max_cg_iter
if (resid .gt. tolerance*resid_0) then
c to avoid using "exit"
iters = iters + 1
is = 1 - cg_halo
ie = sNx + cg_halo
js = 1 - cg_halo
je = sNy + cg_halo
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
Au_SI(i,j,bi,bj) = 0. _d 0
Av_SI(i,j,bi,bj) = 0. _d 0
ENDDO
ENDDO
ENDDO
ENDDO
! IF (STREAMICE_construct_matrix) THEN
! #ifdef STREAMICE_CONSTRUCT_MATRIX
!
! DO bj = myByLo(myThid), myByHi(myThid)
! DO bi = myBxLo(myThid), myBxHi(myThid)
! DO j=js,je
! DO i=is,ie
! DO colx=-1,1
! DO coly=-1,1
! Au_SI(i,j,bi,bj) = Au_SI(i,j,bi,bj) +
! & streamice_cg_A1(i,j,bi,bj,colx,coly)*
! & Du_SI(i+colx,j+coly,bi,bj)+
! & streamice_cg_A2(i,j,bi,bj,colx,coly)*
! & Dv_SI(i+colx,j+coly,bi,bj)
! Av_SI(i,j,bi,bj) = Av_SI(i,j,bi,bj) +
! & streamice_cg_A3(i,j,bi,bj,colx,coly)*
! & Du_SI(i+colx,j+coly,bi,bj)+
! & streamice_cg_A4(i,j,bi,bj,colx,coly)*
! & Dv_SI(i+colx,j+coly,bi,bj)
! ENDDO
! ENDDO
! ENDDO
! ENDDO
! ENDDO
! ENDDO
!
! ! else
! #else
CALL STREAMICE_CG_ACTION( myThid,
O Au_SI,
O Av_SI,
I Du_SI,
I Dv_SI,
I is,ie,js,je)
! ENDIF
! #endif
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
dot_p1_tile(bi,bj) = 0. _d 0
dot_p2_tile(bi,bj) = 0. _d 0
ENDDO
ENDDO
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0) THEN
dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Zu_SI(i,j,bi,bj)*
& Ru_SI(i,j,bi,bj)
dot_p2_tile(bi,bj)=dot_p2_tile(bi,bj)+Du_SI(i,j,bi,bj)*
& Au_SI(i,j,bi,bj)
ENDIF
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0) THEN
dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Zv_SI(i,j,bi,bj)*
& Rv_SI(i,j,bi,bj)
dot_p2_tile(bi,bj)=dot_p2_tile(bi,bj)+Dv_SI(i,j,bi,bj)*
& Av_SI(i,j,bi,bj)
ENDIF
ENDDO
ENDDO
ENDDO
ENDDO
CALL GLOBAL_SUM_TILE_RL( dot_p1_tile, dot_p1, myThid )
CALL GLOBAL_SUM_TILE_RL( dot_p2_tile, dot_p2, myThid )
alpha_k = dot_p1/dot_p2
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0) THEN
cg_Uin(i,j,bi,bj)=cg_Uin(i,j,bi,bj)+
& alpha_k*Du_SI(i,j,bi,bj)
Ru_old_SI(i,j,bi,bj) = Ru_SI(i,j,bi,bj)
Zu_old_SI(i,j,bi,bj) = Zu_SI(i,j,bi,bj)
Ru_SI(i,j,bi,bj) = Ru_SI(i,j,bi,bj)-
& alpha_k*Au_SI(i,j,bi,bj)
Zu_SI(i,j,bi,bj) = Ru_SI(i,j,bi,bj) /
& DIAGu_SI(i,j,bi,bj)
ENDIF
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0) THEN
cg_Vin(i,j,bi,bj)=cg_Vin(i,j,bi,bj)+
& alpha_k*Dv_SI(i,j,bi,bj)
Rv_old_SI(i,j,bi,bj) = Rv_SI(i,j,bi,bj)
Zv_old_SI(i,j,bi,bj) = Zv_SI(i,j,bi,bj)
Rv_SI(i,j,bi,bj) = Rv_SI(i,j,bi,bj)-
& alpha_k*Av_SI(i,j,bi,bj)
Zv_SI(i,j,bi,bj) = Rv_SI(i,j,bi,bj) /
& DIAGv_SI(i,j,bi,bj)
ENDIF
ENDDO
ENDDO
ENDDO
ENDDO
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
dot_p1_tile(bi,bj) = 0. _d 0
dot_p2_tile(bi,bj) = 0. _d 0
ENDDO
ENDDO
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0) THEN
dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Zu_SI(i,j,bi,bj)*
& Ru_SI(i,j,bi,bj)
dot_p2_tile(bi,bj)=dot_p2_tile(bi,bj)+Zu_old_SI(i,j,bi,bj)*
& Ru_old_SI(i,j,bi,bj)
ENDIF
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0) THEN
dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Zv_SI(i,j,bi,bj)*
& Rv_SI(i,j,bi,bj)
dot_p2_tile(bi,bj)=dot_p2_tile(bi,bj)+Zv_old_SI(i,j,bi,bj)*
& Rv_old_SI(i,j,bi,bj)
ENDIF
ENDDO
ENDDO
ENDDO
ENDDO
CALL GLOBAL_SUM_TILE_RL( dot_p1_tile, dot_p1, myThid )
CALL GLOBAL_SUM_TILE_RL( dot_p2_tile, dot_p2, myThid )
beta_k = dot_p1/dot_p2
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0)
& Du_SI(i,j,bi,bj)=beta_k*Du_SI(i,j,bi,bj)+
& Zu_SI(i,j,bi,bj)
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0)
& Dv_SI(i,j,bi,bj)=beta_k*Dv_SI(i,j,bi,bj)+
& Zv_SI(i,j,bi,bj)
ENDDO
ENDDO
ENDDO
ENDDO
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
dot_p1_tile(bi,bj) = 0. _d 0
ENDDO
ENDDO
DO bj = myByLo(myThid), myByHi(myThid)
DO bi = myBxLo(myThid), myBxHi(myThid)
DO j=1,sNy
DO i=1,sNx
IF (STREAMICE_umask(i,j,bi,bj).eq.1.0)
& dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Ru_SI(i,j,bi,bj)**2
IF (STREAMICE_vmask(i,j,bi,bj).eq.1.0)
& dot_p1_tile(bi,bj)=dot_p1_tile(bi,bj)+Rv_SI(i,j,bi,bj)**2
ENDDO
ENDDO
ENDDO
ENDDO
CALL GLOBAL_SUM_TILE_RL( dot_p1_tile, dot_p1, myThid )
resid = sqrt(dot_p1)
! IF (iter .eq. 1) then
! print *, alpha_k, beta_k, resid
! ENDIF
cg_halo = cg_halo - 1
if (cg_halo .eq. 0) then
cg_halo = min(OLx-1,OLy-1)
_EXCH_XY_RL( Du_SI, myThid )
_EXCH_XY_RL( Dv_SI, myThid )
_EXCH_XY_RL( Ru_SI, myThid )
_EXCH_XY_RL( Rv_SI, myThid )
_EXCH_XY_RL( cg_Uin, myThid )
_EXCH_XY_RL( cg_Vin, myThid )
endif
endif
enddo ! end of CG loop
c to avoid using "exit"
c if iters has reached max_iters there is no convergence
IF (iters .lt. streamice_max_cg_iter) THEN
conv_flag = 1
ENDIF
! DO bj = myByLo(myThid), myByHi(myThid)
! DO bi = myBxLo(myThid), myBxHi(myThid)
! DO j=1-OLy,sNy+OLy
! DO i=1-OLy,sNx+OLy
! IF (STREAMICE_umask(i,j,bi,bj).eq.3.0)
! & cg_Uin(i,j,bi,bj)=u_bdry_values_SI(i,j,bi,bj)
! IF (STREAMICE_vmask(i,j,bi,bj).eq.3.0)
! & cg_Vin(i,j,bi,bj)=v_bdry_values_SI(i,j,bi,bj)
! ENDDO
! ENDDO
! ENDDO
! ENDDO
!
! _EXCH_XY_RL( cg_Uin, myThid )
! _EXCH_XY_RL( cg_Vin, myThid )
#endif
RETURN
END