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molod |
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C $Header: /u/u3/gcmpack/MITgcm/pkg/flt/flt_runga2.F,v 1.1 2001/09/13 17:43:56 adcroft Exp $ |
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C $Name: $ |
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adcroft |
1.1 |
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#include "FLT_CPPOPTIONS.h" |
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subroutine flt_runga2 ( |
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I myCurrentIter, |
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I myCurrentTime, |
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I myThid |
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& ) |
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c ================================================================== |
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c SUBROUTINE flt_runga2 |
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c ================================================================== |
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c |
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c o This routine steps floats forward with second order Runga-Kutta |
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c |
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c ================================================================== |
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c SUBROUTINE flt_runga2 |
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c ================================================================== |
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c == global variables == |
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#include "EEPARAMS.h" |
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#include "SIZE.h" |
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#include "DYNVARS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "FLT.h" |
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#ifdef ALLOW_3D_FLT |
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#include "GW.h" |
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#endif |
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c == routine arguments == |
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INTEGER myCurrentIter, myThid |
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_RL myCurrentTime |
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INTEGER bi, bj |
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_RL global2local_i |
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_RL global2local_j |
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c == local variables == |
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integer ip, kp, iG, jG |
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_RL phi, uu, vv, u1, v1 |
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#ifdef ALLOW_3D_FLT |
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_RL ww, w1, zt, zz, scalez |
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#endif |
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_RL xx, yy, xt, yt |
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_RL scalex, scaley |
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character*(max_len_mbuf) msgbuf |
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_RL npart_dist |
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Real*8 PORT_RAND |
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molod |
1.2 |
#undef _USE_INTEGERS |
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#ifdef _USE_INTEGERS |
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integer seed |
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#else |
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Real*8 seed |
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#endif |
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adcroft |
1.1 |
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c == end of interface == |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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do ip=1,npart_tile(bi,bj) |
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c If float has died move to level 0 |
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c |
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if( |
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& (tend(ip,bi,bj).ne.-1. .and. myCurrentTime.gt. tend(ip,bi,bj)) |
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& ) then |
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kpart(ip,bi,bj) = 0. |
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else |
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c Start integration between tstart and tend (individual for each float) |
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c |
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if( |
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& (tstart(ip,bi,bj).eq.-1. .or. myCurrentTime.ge.tstart(ip,bi,bj)) |
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& .and. |
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& ( tend(ip,bi,bj).eq.-1. .or. myCurrentTime.le. tend(ip,bi,bj)) |
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& .and. |
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& ( iup(ip,bi,bj).ne. -3.) |
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& ) then |
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c Convert to local indices |
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c |
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xx=global2local_i(xpart(ip,bi,bj),bi,bj,mythid) |
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yy=global2local_j(ypart(ip,bi,bj),bi,bj,mythid) |
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kp=INT(kpart(ip,bi,bj)) |
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scalex=recip_dxF(INT(xx),INT(yy),bi,bj) |
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scaley=recip_dyF(INT(xx),INT(yy),bi,bj) |
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iG = myXGlobalLo + (bi-1)*sNx |
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jG = myYGlobalLo + (bj-1)*sNy |
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#ifdef ALLOW_3D_FLT |
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if (iup(ip,bi,bj).eq.-1.) then |
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scalez=recip_drF(kp) |
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zt=global2local_j(kpart(ip,bi,bj),bi,bj,mythid) |
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call flt_bilinear3D(xx,yy,uu,zp,uVel,2,bi,bj) |
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call flt_bilinear3D(xx,yy,vv,zp,vVel,3,bi,bj) |
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call flt_bilinear3D(zz,yy,ww,zp,wVel,4,bi,bj) |
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zt=zz+0.5*deltaTmom*zz*scalez |
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else |
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#endif |
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call flt_bilinear(xx,yy,uu,kp,uVel,2,bi,bj) |
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call flt_bilinear(xx,yy,vv,kp,vVel,3,bi,bj) |
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#ifdef ALLOW_3D_FLT |
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endif |
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#endif |
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if (iup(ip,bi,bj).ne.-2.) then |
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molod |
1.2 |
uu = uu + uu*(PORT_RAND(seed)-0.5)*flt_noise |
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vv = vv + vv*(PORT_RAND(seed)-0.5)*flt_noise |
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adcroft |
1.1 |
endif |
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c xx and xt are in indices. Therefore it is necessary to multiply |
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c with a grid scale factor. |
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c |
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xt=xx+0.5*deltaTmom*uu*scalex |
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yt=yy+0.5*deltaTmom*vv*scaley |
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c Second step |
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c |
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#ifdef ALLOW_3D_FLT |
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if (iup(ip,bi,bj).eq.-1.) then |
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call flt_bilinear3D(xt,yt,u1,zt,uVel,2,bi,bj) |
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call flt_bilinear3D(xt,yt,v1,zt,vVel,3,bi,bj) |
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call flt_bilinear3D(xx,yy,w1,zt,wVel,4,bi,bj) |
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kpart(ip,bi,bj) = kpart(ip,bi,bj) + deltaTmom*w1*scalez |
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else |
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#endif |
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call flt_bilinear(xt,yt,u1,kp,uVel,2,bi,bj) |
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call flt_bilinear(xt,yt,v1,kp,vVel,3,bi,bj) |
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#ifdef ALLOW_3D_FLT |
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endif |
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#endif |
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if (iup(ip,bi,bj).ne.-2.) then |
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molod |
1.2 |
u1 = u1 + u1*(PORT_RAND(seed)-0.5)*flt_noise |
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v1 = v1 + v1*(PORT_RAND(seed)-0.5)*flt_noise |
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adcroft |
1.1 |
endif |
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c xpart is in coordinates. Therefore it is necessary to multiply |
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c with a grid scale factor divided by the number grid points per |
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c geographical coordinate. |
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c |
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xpart(ip,bi,bj) = xpart(ip,bi,bj) |
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& + deltaTmom*u1*scalex*delX(iG) |
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ypart(ip,bi,bj) = ypart(ip,bi,bj) |
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& + deltaTmom*v1*scaley*delY(jG) |
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endif |
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endif |
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enddo |
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ENDDO |
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ENDDO |
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c |
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return |
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end |
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