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C $Header: /u/gcmpack/MITgcm/pkg/flt/flt_runga2.F,v 1.4 2004/09/07 16:24:28 edhill Exp $ |
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C $Name: $ |
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|
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#include "FLT_CPPOPTIONS.h" |
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|
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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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|
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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 Runge-Kutta |
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c |
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c started: Arne Biastoch |
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c |
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c changed: 2004.06.10 Antti Westerlund (antti.westerlund@helsinki.fi) |
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c and Sergio Jaramillo (sju@eos.ubc.ca) |
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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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|
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c == global variables == |
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|
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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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|
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c == routine arguments == |
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|
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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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_RL global2local_k |
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c == local variables == |
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|
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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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#ifdef USE_FLT_ALT_NOISE |
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Real*8 PORT_RAND_NORM |
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#else |
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Real*8 PORT_RAND |
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#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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#endif |
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|
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c == end of interface == |
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|
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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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|
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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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|
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c Convert to local indices |
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c |
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|
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C Note: global2local_i and global2local_j use delX and delY. |
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C This may be a problem, especially if you are using a curvilinear |
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C grid. More information below. |
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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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|
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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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|
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|
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#ifdef ALLOW_3D_FLT |
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if (iup(ip,bi,bj).eq.-1.) then |
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c zz=global2local_k(kpart(ip,bi,bj),bi,bj,mythid) |
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|
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c recip_drF is in units 1/r (so if r is in m this is in 1/m) |
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scalez=recip_drF(kp) |
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c We should not do any special conversions for zz, since flt_trilinear |
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c expects it to be just a normal kpart type variable. |
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zz=kpart(ip,bi,bj) |
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call flt_trilinear(xx,yy,zz,uu,uVel,2,bi,bj) |
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call flt_trilinear(xx,yy,zz,vv,vVel,3,bi,bj) |
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call flt_trilinear(zz,yy,zz,ww,wVel,4,bi,bj) |
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zt=zz+0.5*deltaTmom*ww*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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|
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#ifdef USE_FLT_ALT_NOISE |
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c When using this alternative scheme the noise probably should not be added twice. |
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#else |
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if (iup(ip,bi,bj).ne.-2.) then |
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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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#ifdef ALLOW_3D_FLT |
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#ifdef ALLOW_FLT_3D_NOISE |
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if (iup(ip,bi,bj).eq.-1.) then |
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ww = ww + ww*(PORT_RAND(seed)-0.5)*flt_noise |
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endif |
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#endif |
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#endif |
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endif |
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#endif |
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|
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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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|
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c Second step |
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c |
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|
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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_trilinear(xt,yt,zt,u1,uVel,2,bi,bj) |
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call flt_trilinear(xt,yt,zt,v1,vVel,3,bi,bj) |
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call flt_trilinear(xt,yt,zt,w1,wVel,4,bi,bj) |
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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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|
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if (iup(ip,bi,bj).ne.-2.) then |
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#ifdef USE_FLT_ALT_NOISE |
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u1 = u1 + port_rand_norm()*flt_noise |
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v1 = v1 + port_rand_norm()*flt_noise |
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#ifdef ALLOW_3D_FLT |
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#ifdef ALLOW_FLT_3D_NOISE |
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if (iup(ip,bi,bj).eq.-1.) then |
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w1 = w1 + port_rand_norm()*flt_noise |
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endif |
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#endif |
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#endif |
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|
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#else |
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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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#ifdef ALLOW_3D_FLT |
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#ifdef ALLOW_FLT_3D_NOISE |
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if (iup(ip,bi,bj).eq.-1.) then |
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w1 = w1 + w1*(PORT_RAND(seed)-0.5)*flt_noise |
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endif |
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#endif |
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#endif |
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|
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#endif |
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endif |
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|
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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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C This will only work if delX & delY are available. |
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C This may be a problem, especially if you are using a curvilinear |
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C grid. In that case you have to replace them for the values of |
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C your grid, which can be troublesome. |
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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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#ifdef ALLOW_3D_FLT |
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if (iup(ip,bi,bj).eq.-1.) then |
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kpart(ip,bi,bj) = kpart(ip,bi,bj) |
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& + deltaTmom*w1*scalez |
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endif |
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#endif |
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|
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#ifdef ALLOW_3D_FLT |
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c If float is 3D, make sure that it remains in water |
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if (iup(ip,bi,bj).eq.-1.) then |
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c reflect on surface |
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if(kpart(ip,bi,bj).lt.1.0) |
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& kpart(ip,bi,bj)=1.0 |
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& +abs(1.0-kpart(ip,bi,bj)) |
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c stop at bottom |
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if(kpart(ip,bi,bj).gt.Nr) |
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& kpart(ip,bi,bj)=Nr |
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endif |
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#endif |
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endif |
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endif |
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|
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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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