c
c ===================================================================
subroutine rec2(ixy,maxm,meqn,mwaves,mbc,mx,q,method,mthlim,ql,qr)
c ===================================================================
c
c # Reconstruction in primitive variables for the two-dimensional
c # Euler equations. This reconstruction is not conservative!
c
c # Copyright (C) 2002 Ralf Deiterding
c # Brandenburgische Universitaet Cottbus
c
c # Copyright (C) 2003-2007 California Institute of Technology
c # Ralf Deiterding, ralf@amroc.net
c
implicit double precision (a-h,o-z)
c
dimension q(1-mbc:maxm+mbc, meqn)
dimension ql(1-mbc:maxm+mbc, meqn)
dimension qr(1-mbc:maxm+mbc, meqn)
dimension method(7),mthlim(mwaves)
common /param/ gamma,gamma1
c
mu = 2
mv = 3
mE = 4
c
mlim = 0
do 90 mw=1,mwaves
if (mthlim(mw) .gt. 0) then
mlim = mthlim(mw)
goto 95
endif
90 continue
95 continue
c
c # Linear interpolation: om=0.d0, quadratic interpolation: om!=0.d0,
c # Second order accuracte reconstruction for om=1.d0/3.d0
c
om = 0.d0
do 110 i=2-mbc,mx+mbc-1
c
c # Reconstruction
rho = q(i ,1)
rho1 = q(i-1,1)
rho2 = q(i+1,1)
u = q(i ,mu)/rho
u1 = q(i-1,mu)/rho1
u2 = q(i+1,mu)/rho2
v = q(i ,mv)/rho
v1 = q(i-1,mv)/rho1
v2 = q(i+1,mv)/rho2
p = gamma1*(q(i ,mE) - 0.5d0*rho *(u**2 +v**2 ))
p1 = gamma1*(q(i-1,mE) - 0.5d0*rho1*(u1**2+v1**2))
p2 = gamma1*(q(i+1,mE) - 0.5d0*rho2*(u2**2+v2**2))
c
call reclim(rho,rho1,rho2,mlim,om,rhol,rhor)
call reclim(u,u1,u2,mlim,om,ul,ur)
call reclim(v,v1,v2,mlim,om,vl,vr)
call reclim(p,p1,p2,mlim,om,pl,pr)
c
ql(i,1) = rhol
qr(i,1) = rhor
ql(i,mu) = ul*rhol
qr(i,mu) = ur*rhor
ql(i,mv) = vl*rhol
qr(i,mv) = vr*rhor
ql(i,mE) = pl/gamma1+0.5d0*rhol*(ul**2+vl**2)
qr(i,mE) = pr/gamma1+0.5d0*rhor*(ur**2+vr**2)
c
110 continue
c
return
end
c
c