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jmc |
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C $Header: /u/gcmpack/MITgcm/model/src/adams_bashforth2.F,v 1.7 2007/10/19 14:41:39 jmc Exp $ |
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cnh |
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C $Name: $ |
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adcroft |
1.1 |
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#include "CPP_OPTIONS.h" |
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cnh |
1.2 |
CBOP |
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C !ROUTINE: ADAMS_BASHFORTH2 |
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C !INTERFACE: |
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adcroft |
1.1 |
SUBROUTINE ADAMS_BASHFORTH2( |
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jmc |
1.6 |
I bi, bj, k, |
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adcroft |
1.1 |
U gTracer, gTrNm1, |
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jmc |
1.8 |
O AB_gTr, |
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jmc |
1.7 |
I startAB, myIter, myThid ) |
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cnh |
1.2 |
C !DESCRIPTION: \bv |
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C *==========================================================* |
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jmc |
1.7 |
C | S/R ADAMS_BASHFORTH2 |
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C | o Extrapolate tendencies forward in time using |
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C | quasi-second order Adams-Bashforth method. |
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cnh |
1.2 |
C *==========================================================* |
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C \ev |
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C !USES: |
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adcroft |
1.1 |
IMPLICIT NONE |
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C == Global variables === |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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cnh |
1.2 |
C !INPUT/OUTPUT PARAMETERS: |
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adcroft |
1.1 |
C == Routine Arguments == |
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jmc |
1.6 |
C bi,bj,k :: Tile and level indices |
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jmc |
1.8 |
C gTracer :: in: Tendency at current time ( generally units of quantity/sec ) |
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C :: out: Extrapolated Tendency at current time ( same units ) |
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C gTrNm1 :: in: Tendency at previous time ( same units ) |
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C :: out: Save tendency at current time ( same units ) |
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C AB_gTr :: Adams-Bashforth tendency increment |
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jmc |
1.7 |
C startAB :: number of previous time level available to start/restart AB |
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cnh |
1.2 |
C myIter :: Current time step number |
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jmc |
1.8 |
C myThid :: my Thread Id. number |
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jmc |
1.6 |
INTEGER bi,bj,k |
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adcroft |
1.1 |
_RL gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL gTrNm1 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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jmc |
1.8 |
_RL AB_gTr (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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jmc |
1.7 |
INTEGER startAB |
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adcroft |
1.1 |
INTEGER myIter, myThid |
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cnh |
1.2 |
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C !LOCAL VARIABLES: |
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adcroft |
1.1 |
C == Local variables == |
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cnh |
1.2 |
C i,j :: Loop counters |
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jmc |
1.8 |
C abFac :: Adams bashforth extrapolation factor |
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adcroft |
1.1 |
INTEGER i,j |
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jmc |
1.8 |
_RL abFac |
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cnh |
1.2 |
CEOP |
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adcroft |
1.1 |
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jmc |
1.8 |
C Adams-Bashforth extrapolation factor |
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jmc |
1.7 |
IF ( myIter.EQ.nIter0 .AND. startAB.EQ.0 ) THEN |
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jmc |
1.8 |
abFac = 0. _d 0 |
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adcroft |
1.1 |
ELSE |
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jmc |
1.8 |
abFac = 0.5 _d 0 + abEps |
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adcroft |
1.1 |
ENDIF |
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jmc |
1.7 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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adcroft |
1.1 |
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C- Compute effective G-term with Adams-Bashforth weights: |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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jmc |
1.8 |
AB_gTr(i,j) = abFac |
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& *( gTracer(i,j,k,bi,bj)- gTrNm1(i,j,k,bi,bj) ) |
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adcroft |
1.1 |
gTrNm1(i,j,k,bi,bj) = gTracer(i,j,k,bi,bj) |
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jmc |
1.8 |
gTracer(i,j,k,bi,bj) = gTracer(i,j,k,bi,bj) + AB_gTr(i,j) |
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adcroft |
1.1 |
ENDDO |
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ENDDO |
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RETURN |
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END |
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