model/src/adams_bashforth2.F

C $Header: $
C $Name: $

#include "CPP_OPTIONS.h"

      SUBROUTINE ADAMS_BASHFORTH2(
     I                     bi, bj, K,
     U                     gTracer, gTrNm1,
     I                     myIter, myThid )
C     /==========================================================\
C     | S/R ADAMS_BASHFORTH2                                     |
C     | o Extrapolate tendancies forward in time using           |
C     |   quasi-second order Adams-Bashforth method.             |
C     \==========================================================/
      IMPLICIT NONE

C     == Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GAD.h"
#include "GRID.h"
#include "SURFACE.h"

C     == Routine Arguments ==
      INTEGER bi,bj,K
      _RL  gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      _RL  gTrNm1 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      INTEGER myIter, myThid
C     == Local variables ==
      INTEGER i,j
      _RL ab15,ab05
      _RL gTrtmp

C     Adams-Bashforth timestepping weights
      IF (myIter .EQ. 0) THEN
       ab15=1.0
       ab05=0.0
      ELSE
       ab15=1.5+abEps
       ab05=-(0.5+abEps)
      ENDIF

C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|

C-    Compute effective G-term with Adams-Bashforth weights:
      DO j=1-Oly,sNy+Oly
       DO i=1-Olx,sNx+Olx
        gTrtmp = ab15*gTracer(i,j,k,bi,bj) 
     &         + ab05*gTrNm1(i,j,k,bi,bj)
        gTrNm1(i,j,k,bi,bj) = gTracer(i,j,k,bi,bj)
        gTracer(i,j,k,bi,bj) = gTrtmp
       ENDDO
      ENDDO

      RETURN
      END
1	C $Header: $
2	C $Name: $
3
4	#include "CPP_OPTIONS.h"
5
6	SUBROUTINE ADAMS_BASHFORTH2(
7	I bi, bj, K,
8	U gTracer, gTrNm1,
9	I myIter, myThid )
10	C /==========================================================\
11	C \| S/R ADAMS_BASHFORTH2 \|
12	C \| o Extrapolate tendancies forward in time using \|
13	C \| quasi-second order Adams-Bashforth method. \|
14	C \==========================================================/
15	IMPLICIT NONE
16
17	C == Global variables ===
18	#include "SIZE.h"
19	#include "EEPARAMS.h"
20	#include "PARAMS.h"
21	#include "GAD.h"
22	#include "GRID.h"
23	#include "SURFACE.h"
24
25	C == Routine Arguments ==
26	INTEGER bi,bj,K
27	_RL gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
28	_RL gTrNm1 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
29	INTEGER myIter, myThid
30	C == Local variables ==
31	INTEGER i,j
32	_RL ab15,ab05
33	_RL gTrtmp
34
35	C Adams-Bashforth timestepping weights
36	IF (myIter .EQ. 0) THEN
37	ab15=1.0
38	ab05=0.0
39	ELSE
40	ab15=1.5+abEps
41	ab05=-(0.5+abEps)
42	ENDIF
43
44	C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-\|--+----\|
45
46	C- Compute effective G-term with Adams-Bashforth weights:
47	DO j=1-Oly,sNy+Oly
48	DO i=1-Olx,sNx+Olx
49	gTrtmp = ab15*gTracer(i,j,k,bi,bj)
50	& + ab05*gTrNm1(i,j,k,bi,bj)
51	gTrNm1(i,j,k,bi,bj) = gTracer(i,j,k,bi,bj)
52	gTracer(i,j,k,bi,bj) = gTrtmp
53	ENDDO
54	ENDDO
55
56	RETURN
57	END