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jmc |
1.10 |
C $Header: /u/gcmpack/MITgcm/pkg/obcs/orlanski_south.F,v 1.9 2011/05/24 14:31:14 jmc Exp $ |
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adcroft |
1.3 |
C $Name: $ |
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adcroft |
1.2 |
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#include "OBCS_OPTIONS.h" |
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jmc |
1.7 |
SUBROUTINE ORLANSKI_SOUTH( bi, bj, futureTime, |
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I uVel, vVel, wVel, theta, salt, |
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adcroft |
1.2 |
I myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE ORLANSKI_SOUTH | |
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C | o Calculate future boundary data at open boundaries | |
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C | at time = futureTime by applying Orlanski radiation | |
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C | conditions. | |
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C |==========================================================| |
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C | | |
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C \==========================================================/ |
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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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#include "GRID.h" |
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jmc |
1.9 |
#include "OBCS_PARAMS.h" |
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#include "OBCS_GRID.h" |
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#include "OBCS_FIELDS.h" |
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adcroft |
1.2 |
#include "ORLANSKI.h" |
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jmc |
1.7 |
C SPK 6/2/00: Added radiative OBCs for salinity. |
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C SPK 6/6/00: Changed calculation of OB*w. When K=1, the |
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adcroft |
1.2 |
C upstream value is used. For example on the eastern OB: |
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C IF (K.EQ.1) THEN |
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C OBEw(J,K,bi,bj)=wVel(I_obc-1,J,K,bi,bj) |
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C ENDIF |
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jmc |
1.7 |
C |
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adcroft |
1.2 |
C SPK 7/7/00: 1) Removed OB*w fix (see above). |
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C 2) Added variable CMAX. Maximum diagnosed phase speed is now |
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jmc |
1.7 |
C clamped to CMAX. For stability of AB-II scheme (CFL) the |
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adcroft |
1.2 |
C (non-dimensional) phase speed must be <0.5 |
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C 3) (Sonya Legg) Changed application of uVel and vVel. |
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jmc |
1.7 |
C uVel on the western OB is actually applied at I_obc+1 |
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adcroft |
1.2 |
C while vVel on the southern OB is applied at J_obc+1. |
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adcroft |
1.3 |
C 4) (Sonya Legg) Added templates for forced OBs. |
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adcroft |
1.2 |
C |
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C SPK 7/17/00: Non-uniform resolution is now taken into account in diagnosing |
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C phase speeds and time-stepping OB values. CL is still the |
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C non-dimensional phase speed; CVEL is the dimensional phase |
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jmc |
1.7 |
C speed: CVEL = CL*(dx or dy)/dt, where dx and dy is the |
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C appropriate grid spacings. Note that CMAX (with which CL |
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adcroft |
1.2 |
C is compared) remains non-dimensional. |
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jmc |
1.7 |
C |
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C SPK 7/18/00: Added code to allow filtering of phase speed following |
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C Blumberg and Kantha. There is now a separate array |
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adcroft |
1.2 |
C CVEL_**, where **=Variable(U,V,T,S,W)Boundary(E,W,N,S) for |
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jmc |
1.7 |
C the dimensional phase speed. These arrays are initialized to |
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adcroft |
1.2 |
C zero in ini_obcs.F. CVEL_** is filtered according to |
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C CVEL_** = fracCVEL*CVEL(new) + (1-fracCVEL)*CVEL_**(old). |
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C fracCVEL=1.0 turns off filtering. |
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C |
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jmc |
1.7 |
C SPK 7/26/00: Changed code to average phase speed. A new variable |
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adcroft |
1.2 |
C 'cvelTimeScale' was created. This variable must now be |
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jmc |
1.7 |
C specified. Then, fracCVEL=deltaT/cvelTimeScale. |
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C Since the goal is to smooth out the 'singularities' in the |
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C diagnosed phase speed, cvelTimeScale could be picked as the |
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C duration of the singular period in the unfiltered case. Thus, |
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C for a plane wave cvelTimeScale might be the time take for the |
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adcroft |
1.2 |
C wave to travel a distance DX, where DX is the width of the region |
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C near which d(phi)/dx is small. |
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C == Routine arguments == |
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INTEGER bi, bj |
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_RL futureTime |
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_RL uVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL vVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL wVel (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL theta(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL salt (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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INTEGER myThid |
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#ifdef ALLOW_ORLANSKI |
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heimbach |
1.5 |
#ifdef ALLOW_OBCS_SOUTH |
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adcroft |
1.2 |
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C == Local variables == |
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INTEGER I, K, J_obc |
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_RL CL, ab1, ab2, fracCVEL, f1, f2 |
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ab1 = 1.5 _d 0 + abEps /* Adams-Bashforth coefficients */ |
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ab2 = -0.5 _d 0 - abEps |
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/* CMAX is maximum allowable phase speed-CFL for AB-II */ |
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/* cvelTimeScale is averaging period for phase speed in sec. */ |
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fracCVEL = deltaT/cvelTimeScale /* fraction of new phase speed used*/ |
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adcroft |
1.3 |
f1 = fracCVEL /* dont change this. Set cvelTimeScale */ |
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f2 = 1.0-fracCVEL /* dont change this. set cvelTimeScale */ |
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adcroft |
1.2 |
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C Southern OB (Orlanski Radiation Condition) |
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DO K=1,Nr |
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jmc |
1.10 |
DO I=1-OLx,sNx+OLx |
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adcroft |
1.2 |
J_obc=OB_Js(I,bi,bj) |
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jmc |
1.10 |
IF ( J_obc.NE.OB_indexNone ) THEN |
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adcroft |
1.2 |
C uVel |
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IF ((US_STORE_2(I,K,bi,bj).eq.0.).and. |
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& (US_STORE_3(I,K,bi,bj).eq.0.)) THEN |
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CL=0. |
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ELSE |
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CL=(uVel(I,J_obc+1,K,bi,bj)-US_STORE_1(I,K,bi,bj))/ |
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& (ab1*US_STORE_2(I,K,bi,bj) + ab2*US_STORE_3(I,K,bi,bj)) |
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ENDIF |
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IF (CL.lt.0.) THEN |
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CL=0. |
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ELSEIF (CL.gt.CMAX) THEN |
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CL=CMAX |
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ENDIF |
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CVEL_US(I,K,bi,bj) = f1*(CL*dyU(I,J_obc+2,bi,bj)/deltaT)+ |
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& f2*CVEL_US(I,K,bi,bj) |
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C update OBC to next timestep |
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OBSu(I,K,bi,bj)=uVel(I,J_obc,K,bi,bj)+ |
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jmc |
1.4 |
& CVEL_US(I,K,bi,bj)*deltaT*recip_dyU(I,J_obc+1,bi,bj)* |
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adcroft |
1.2 |
& (ab1*(uVel(I,J_obc+1,K,bi,bj)-uVel(I,J_obc,K,bi,bj)) + |
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& ab2*(US_STORE_1(I,K,bi,bj)-US_STORE_4(I,K,bi,bj))) |
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C vVel (to be applied at J_obc+1) |
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IF ((VS_STORE_2(I,K,bi,bj).eq.0.).and. |
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& (VS_STORE_3(I,K,bi,bj).eq.0.)) THEN |
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CL=0. |
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ELSE |
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CL=(vVel(I,J_obc+2,K,bi,bj)-VS_STORE_1(I,K,bi,bj))/ |
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& (ab1*VS_STORE_2(I,K,bi,bj) + ab2*VS_STORE_3(I,K,bi,bj)) |
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ENDIF |
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IF (CL.lt.0.) THEN |
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CL=0. |
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ELSEIF (CL.gt.CMAX) THEN |
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CL=CMAX |
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ENDIF |
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CVEL_VS(I,K,bi,bj) = f1*(CL*dyF(I,J_obc+2,bi,bj)/deltaT)+ |
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& f2*CVEL_VS(I,K,bi,bj) |
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C update OBC to next timestep |
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OBSv(I,K,bi,bj)=vVel(I,J_obc+1,K,bi,bj)+ |
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jmc |
1.4 |
& CVEL_VS(I,K,bi,bj)*deltaT*recip_dyF(I,J_obc+1,bi,bj)* |
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adcroft |
1.2 |
& (ab1*(vVel(I,J_obc+2,K,bi,bj)-vVel(I,J_obc+1,K,bi,bj))+ |
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& ab2*(VS_STORE_1(I,K,bi,bj)-VS_STORE_4(I,K,bi,bj))) |
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C Temperature |
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IF ((TS_STORE_2(I,K,bi,bj).eq.0.).and. |
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& (TS_STORE_3(I,K,bi,bj).eq.0.)) THEN |
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CL=0. |
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ELSE |
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CL=(theta(I,J_obc+1,K,bi,bj)-TS_STORE_1(I,K,bi,bj))/ |
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& (ab1*TS_STORE_2(I,K,bi,bj) + ab2*TS_STORE_3(I,K,bi,bj)) |
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ENDIF |
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IF (CL.lt.0.) THEN |
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CL=0. |
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ELSEIF (CL.gt.CMAX) THEN |
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CL=CMAX |
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ENDIF |
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CVEL_TS(I,K,bi,bj) = f1*(CL*dyC(I,J_obc+2,bi,bj)/deltaT)+ |
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& f2*CVEL_TS(I,K,bi,bj) |
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C update OBC to next timestep |
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OBSt(I,K,bi,bj)=theta(I,J_obc,K,bi,bj)+ |
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jmc |
1.4 |
& CVEL_TS(I,K,bi,bj)*deltaT*recip_dyC(I,J_obc+1,bi,bj)* |
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adcroft |
1.2 |
& (ab1*(theta(I,J_obc+1,K,bi,bj)-theta(I,J_obc,K,bi,bj))+ |
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& ab2*(TS_STORE_1(I,K,bi,bj)-TS_STORE_4(I,K,bi,bj))) |
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C Salinity |
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IF ((SS_STORE_2(I,K,bi,bj).eq.0.).and. |
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& (SS_STORE_3(I,K,bi,bj).eq.0.)) THEN |
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CL=0. |
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ELSE |
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CL=(salt(I,J_obc+1,K,bi,bj)-SS_STORE_1(I,K,bi,bj))/ |
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& (ab1*SS_STORE_2(I,K,bi,bj) + ab2*SS_STORE_3(I,K,bi,bj)) |
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ENDIF |
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IF (CL.lt.0.) THEN |
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CL=0. |
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ELSEIF (CL.gt.CMAX) THEN |
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CL=CMAX |
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ENDIF |
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CVEL_SS(I,K,bi,bj) = f1*(CL*dyC(I,J_obc+2,bi,bj)/deltaT)+ |
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& f2*CVEL_SS(I,K,bi,bj) |
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C update OBC to next timestep |
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OBSs(I,K,bi,bj)=salt(I,J_obc,K,bi,bj)+ |
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jmc |
1.4 |
& CVEL_SS(I,K,bi,bj)*deltaT*recip_dyC(I,J_obc+1,bi,bj)* |
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adcroft |
1.2 |
& (ab1*(salt(I,J_obc+1,K,bi,bj)-salt(I,J_obc,K,bi,bj)) + |
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& ab2*(SS_STORE_1(I,K,bi,bj)-SS_STORE_4(I,K,bi,bj))) |
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jmc |
1.8 |
#ifdef ALLOW_NONHYDROSTATIC |
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IF ( nonHydrostatic ) THEN |
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adcroft |
1.2 |
C wVel |
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jmc |
1.8 |
IF ((WS_STORE_2(I,K,bi,bj).eq.0.).and. |
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& (WS_STORE_3(I,K,bi,bj).eq.0.)) THEN |
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CL=0. |
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ELSE |
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CL=(wVel(I,J_obc+1,K,bi,bj)-WS_STORE_1(I,K,bi,bj))/ |
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& (ab1*WS_STORE_2(I,K,bi,bj)+ab2*WS_STORE_3(I,K,bi,bj)) |
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ENDIF |
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IF (CL.lt.0.) THEN |
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CL=0. |
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ELSEIF (CL.gt.CMAX) THEN |
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CL=CMAX |
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ENDIF |
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CVEL_WS(I,K,bi,bj)=f1*(CL*dyC(I,J_obc+2,bi,bj)/deltaT) |
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adcroft |
1.2 |
& + f2*CVEL_WS(I,K,bi,bj) |
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jmc |
1.8 |
C update OBC to next timestep |
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OBSw(I,K,bi,bj)=wVel(I,J_obc,K,bi,bj)+ |
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& CVEL_WS(I,K,bi,bj)*deltaT*recip_dyC(I,J_obc+1,bi,bj)* |
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& (ab1*(wVel(I,J_obc+1,K,bi,bj)-wVel(I,J_obc,K,bi,bj))+ |
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& ab2*(WS_STORE_1(I,K,bi,bj)-WS_STORE_4(I,K,bi,bj))) |
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ENDIF |
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#endif /* ALLOW_NONHYDROSTATIC */ |
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adcroft |
1.2 |
C update/save storage arrays |
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C uVel |
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C copy t-1 to t-2 array |
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US_STORE_3(I,K,bi,bj)=US_STORE_2(I,K,bi,bj) |
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C copy (current time) t to t-1 arrays |
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US_STORE_2(I,K,bi,bj)=uVel(I,J_obc+2,K,bi,bj) - |
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& uVel(I,J_obc+1,K,bi,bj) |
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US_STORE_1(I,K,bi,bj)=uVel(I,J_obc+1,K,bi,bj) |
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US_STORE_4(I,K,bi,bj)=uVel(I,J_obc,K,bi,bj) |
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C vVel |
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C copy t-1 to t-2 array |
| 216 |
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VS_STORE_3(I,K,bi,bj)=VS_STORE_2(I,K,bi,bj) |
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C copy (current time) t to t-1 arrays |
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VS_STORE_2(I,K,bi,bj)=vVel(I,J_obc+3,K,bi,bj) - |
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& vVel(I,J_obc+2,K,bi,bj) |
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VS_STORE_1(I,K,bi,bj)=vVel(I,J_obc+2,K,bi,bj) |
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VS_STORE_4(I,K,bi,bj)=vVel(I,J_obc+1,K,bi,bj) |
| 222 |
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C Temperature |
| 223 |
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C copy t-1 to t-2 array |
| 224 |
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TS_STORE_3(I,K,bi,bj)=TS_STORE_2(I,K,bi,bj) |
| 225 |
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C copy (current time) t to t-1 arrays |
| 226 |
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TS_STORE_2(I,K,bi,bj)=theta(I,J_obc+2,K,bi,bj) - |
| 227 |
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& theta(I,J_obc+1,K,bi,bj) |
| 228 |
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TS_STORE_1(I,K,bi,bj)=theta(I,J_obc+1,K,bi,bj) |
| 229 |
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TS_STORE_4(I,K,bi,bj)=theta(I,J_obc,K,bi,bj) |
| 230 |
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C Salinity |
| 231 |
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C copy t-1 to t-2 array |
| 232 |
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SS_STORE_3(I,K,bi,bj)=SS_STORE_2(I,K,bi,bj) |
| 233 |
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C copy (current time) t to t-1 arrays |
| 234 |
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SS_STORE_2(I,K,bi,bj)=salt(I,J_obc+2,K,bi,bj) - |
| 235 |
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& salt(I,J_obc+1,K,bi,bj) |
| 236 |
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SS_STORE_1(I,K,bi,bj)=salt(I,J_obc+1,K,bi,bj) |
| 237 |
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SS_STORE_4(I,K,bi,bj)=salt(I,J_obc,K,bi,bj) |
| 238 |
jmc |
1.8 |
#ifdef ALLOW_NONHYDROSTATIC |
| 239 |
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IF ( nonHydrostatic ) THEN |
| 240 |
adcroft |
1.2 |
C wVel |
| 241 |
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C copy t-1 to t-2 array |
| 242 |
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WS_STORE_3(I,K,bi,bj)=WS_STORE_2(I,K,bi,bj) |
| 243 |
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C copy (current time) t to t-1 arrays |
| 244 |
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WS_STORE_2(I,K,bi,bj)=wVel(I,J_obc+2,K,bi,bj) - |
| 245 |
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& wVel(I,J_obc+1,K,bi,bj) |
| 246 |
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WS_STORE_1(I,K,bi,bj)=wVel(I,J_obc+1,K,bi,bj) |
| 247 |
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WS_STORE_4(I,K,bi,bj)=wVel(I,J_obc,K,bi,bj) |
| 248 |
jmc |
1.8 |
ENDIF |
| 249 |
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#endif /* ALLOW_NONHYDROSTATIC */ |
| 250 |
adcroft |
1.2 |
ENDIF |
| 251 |
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ENDDO |
| 252 |
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ENDDO |
| 253 |
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| 254 |
jmc |
1.6 |
#endif /* ALLOW_OBCS_SOUTH */ |
| 255 |
adcroft |
1.2 |
#endif /* ALLOW_ORLANSKI */ |
| 256 |
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RETURN |
| 257 |
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END |
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