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guez |
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subroutine dvthermcell2(ngrid,nlay,ptimestep,fm,entr,masse & |
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,fraca,larga & |
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,u,v,du,dv,ua,va) |
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use dimens_m |
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use dimphy |
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implicit none |
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!======================================================================= |
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! |
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! Calcul du transport verticale dans la couche limite en presence |
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! de "thermiques" explicitement representes |
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! calcul du dq/dt une fois qu'on connait les ascendances |
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! |
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!======================================================================= |
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integer ngrid,nlay |
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real ptimestep |
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real masse(ngrid,nlay),fm(ngrid,nlay+1) |
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real fraca(ngrid,nlay+1) |
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real larga(ngrid) |
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real entr(ngrid,nlay) |
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real u(ngrid,nlay) |
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real ua(ngrid,nlay) |
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real du(ngrid,nlay) |
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real v(ngrid,nlay) |
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real va(ngrid,nlay) |
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real dv(ngrid,nlay) |
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real qa(klon,klev),detr(klon,klev),zf,zf2 |
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real wvd(klon,klev+1),wud(klon,klev+1) |
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real gamma0,gamma(klon,klev+1) |
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real ue(klon,klev),ve(klon,klev) |
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real dua,dva |
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integer iter |
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integer ig,k |
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! calcul du detrainement |
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do k=1,nlay |
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do ig=1,ngrid |
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detr(ig,k)=fm(ig,k)-fm(ig,k+1)+entr(ig,k) |
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enddo |
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enddo |
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! calcul de la valeur dans les ascendances |
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do ig=1,ngrid |
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ua(ig,1)=u(ig,1) |
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va(ig,1)=v(ig,1) |
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ue(ig,1)=u(ig,1) |
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ve(ig,1)=v(ig,1) |
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enddo |
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do k=2,nlay |
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do ig=1,ngrid |
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if ((fm(ig,k+1)+detr(ig,k))*ptimestep.gt. & |
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1.e-5*masse(ig,k)) then |
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! On itère sur la valeur du coeff de freinage. |
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! gamma0=rho(ig,k)*(zlev(ig,k+1)-zlev(ig,k)) |
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gamma0=masse(ig,k) & |
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*sqrt( 0.5*(fraca(ig,k+1)+fraca(ig,k)) ) & |
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*0.5/larga(ig) & |
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*1. |
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! s *0.5 |
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! gamma0=0. |
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zf=0.5*(fraca(ig,k)+fraca(ig,k+1)) |
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zf=0. |
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zf2=1./(1.-zf) |
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! la première fois on multiplie le coefficient de freinage |
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! par le module du vent dans la couche en dessous. |
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dua=ua(ig,k-1)-u(ig,k-1) |
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dva=va(ig,k-1)-v(ig,k-1) |
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do iter=1,5 |
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! On choisit une relaxation lineaire. |
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gamma(ig,k)=gamma0 |
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! On choisit une relaxation quadratique. |
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gamma(ig,k)=gamma0*sqrt(dua**2+dva**2) |
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ua(ig,k)=(fm(ig,k)*ua(ig,k-1) & |
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+(zf2*entr(ig,k)+gamma(ig,k))*u(ig,k)) & |
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/(fm(ig,k+1)+detr(ig,k)+entr(ig,k)*zf*zf2 & |
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+gamma(ig,k)) |
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va(ig,k)=(fm(ig,k)*va(ig,k-1) & |
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+(zf2*entr(ig,k)+gamma(ig,k))*v(ig,k)) & |
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/(fm(ig,k+1)+detr(ig,k)+entr(ig,k)*zf*zf2 & |
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+gamma(ig,k)) |
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! print*,k,ua(ig,k),va(ig,k),u(ig,k),v(ig,k),dua,dva |
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dua=ua(ig,k)-u(ig,k) |
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dva=va(ig,k)-v(ig,k) |
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ue(ig,k)=(u(ig,k)-zf*ua(ig,k))*zf2 |
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ve(ig,k)=(v(ig,k)-zf*va(ig,k))*zf2 |
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enddo |
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else |
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ua(ig,k)=u(ig,k) |
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va(ig,k)=v(ig,k) |
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ue(ig,k)=u(ig,k) |
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ve(ig,k)=v(ig,k) |
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gamma(ig,k)=0. |
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endif |
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enddo |
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enddo |
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do k=2,nlay |
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do ig=1,ngrid |
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wud(ig,k)=fm(ig,k)*ue(ig,k) |
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wvd(ig,k)=fm(ig,k)*ve(ig,k) |
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enddo |
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enddo |
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do ig=1,ngrid |
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wud(ig,1)=0. |
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wud(ig,nlay+1)=0. |
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wvd(ig,1)=0. |
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wvd(ig,nlay+1)=0. |
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enddo |
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do k=1,nlay |
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do ig=1,ngrid |
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du(ig,k)=((detr(ig,k)+gamma(ig,k))*ua(ig,k) & |
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-(entr(ig,k)+gamma(ig,k))*ue(ig,k) & |
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-wud(ig,k)+wud(ig,k+1)) & |
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/masse(ig,k) |
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dv(ig,k)=((detr(ig,k)+gamma(ig,k))*va(ig,k) & |
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-(entr(ig,k)+gamma(ig,k))*ve(ig,k) & |
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-wvd(ig,k)+wvd(ig,k+1)) & |
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/masse(ig,k) |
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enddo |
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enddo |
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return |
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end |
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