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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_calc_residual.F,v 1.3 2012/11/09 14:03:10 mlosch Exp $ |
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C $Name: $ |
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|
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#include "SEAICE_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SEAICE_CALC_RESIDUAL |
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C !INTERFACE: |
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SUBROUTINE SEAICE_CALC_RESIDUAL( |
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I uIceLoc, vIceLoc, |
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O uIceRes, vIceRes, |
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I newtonIter, krylovIter, myTime, myIter, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE SEAICE_CALC_RESIDUAL |
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C | o For Jacobian-free Newton-Krylov solver compute |
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C | the residual of the momentum equations |
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C *==========================================================* |
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C | written by Martin Losch, Oct 2012 |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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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 "SEAICE_SIZE.h" |
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#include "SEAICE.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C myTime :: Simulation time |
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C myIter :: Simulation timestep number |
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C myThid :: my Thread Id. number |
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C newtonIter :: current iterate of Newton iteration |
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C krylovIter :: current iterate of Krylov iteration |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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INTEGER newtonIter |
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INTEGER krylovIter |
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C u/vIceLoc :: local copies of the current ice velocity |
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_RL uIceLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL vIceLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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C u/vIceRes :: residual of sea-ice momentum equations |
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_RL uIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL vIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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|
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#ifdef SEAICE_ALLOW_JFNK |
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C u/vIceLHS :: left hand side of momentum equations |
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_RL uIceLHS(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL vIceLHS(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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C u/vIceRHS :: righ hand side of momentum equations |
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_RL uIceRHS(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL vIceRHS(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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|
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C i,j,bi,bj :: loop indices |
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INTEGER i,j,bi,bj |
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CEOP |
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|
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C Initialise |
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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 J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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uIceLHS(I,J,bi,bj) = 0. _d 0 |
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vIceLHS(I,J,bi,bj) = 0. _d 0 |
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uIceRHS(I,J,bi,bj) = 0. _d 0 |
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vIceRHS(I,J,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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C u/vIceLoc have changed so that new drag coefficients and |
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C viscosities are required |
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CALL SEAICE_OCEANDRAG_COEFFS( |
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I uIceLoc, vIceLoc, |
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O DWATN, |
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I krylovIter, myTime, myIter, myThid ) |
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CALL SEAICE_CALC_STRAINRATES( |
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I uIceLoc, vIceLoc, |
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O e11, e22, e12, |
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I krylovIter, myTime, myIter, myThid ) |
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CALL SEAICE_CALC_VISCOSITIES( |
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I e11, e22, e12, zMin, zMax, hEffM, press0, |
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O eta, etaZ, zeta, press, |
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I krylovIter, myTime, myIter, myThid ) |
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|
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C The scheme is backward Euler in time, i.e. the rhs-vector contains |
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C only terms that are independent of u/vIce, except for the time |
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C derivative part mass*(u/vIce-u/vIceNm1)/deltaT |
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|
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C compute new right hand side (depends to DWATN=Cdrag) |
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C sea-surface tilt and wind stress: FORCEX0, FORCEY0 |
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C + mass*(u/vIceNm1)/deltaT |
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C + Cdrag*(uVel*cosWat - vVel*sinWat)/(vVel*cosWat + uVel*sinWat) |
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CALL SEAICE_CALC_RHS( |
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O uIceRHS, vIceRHS, |
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I newtonIter, krylovIter, myTime, myIter, myThid ) |
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|
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C Left-hand side contributions: |
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C + mass*(u/vIce)/deltaT |
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C + Cdrag*(uIce*cosWat - vIce*sinWat)/(vIce*cosWat + uIce*sinWat) |
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C - mass*f*vIce/+mass*f*uIce |
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C - dsigma/dx / -dsigma/dy, eta and zeta are only computed once per |
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C Newton iterate |
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CALL SEAICE_CALC_LHS( |
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I uIceLoc, vIceLoc, |
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O uIceLHS, vIceLHS, |
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I newtonIter, myTime, myIter, myThid ) |
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|
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C Right-hand side contributions only need to be computed once per |
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C time step, therefore we will put them into a separate routine |
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C and call them elsewhere to save floating point operations |
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|
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C Calculate the residual |
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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 J=1,sNy |
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DO I=1,sNx |
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uIceRes(I,J,bi,bj) = uIceLHS(I,J,bi,bj) - uIceRHS(I,J,bi,bj) |
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vIceRes(I,J,bi,bj) = vIceLHS(I,J,bi,bj) - vIceRHS(I,J,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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#endif /* SEAICE_ALLOW_JFNK */ |
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|
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RETURN |
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END |
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