c
c
c ==========================================================
subroutine chk1eu(q,mx,lb,ub,lbr,ubr,shaper,meqn,
& mout,mresult)
c ==========================================================
c
c # Controls, if density and pressure remain positive.
c # An essential debugging tool for AMROC.
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 none
c
integer meqn, mx, mout
double precision q(meqn,mx)
c
integer lb(1), ub(1), lbr(1), ubr(1), shaper(1),
& mresult, stride, imin(1), imax(1), i, getindx
common /param/ gamma, gamma1
double precision gamma, gamma1, p
c
stride = (ub(1) - lb(1))/(mx-1)
imin(1) = max(lb(1), lbr(1))
imax(1) = min(ub(1), ubr(1))
if (mod(imin(1)-lb(1),stride) .ne. 0) then
imin(1) = imin(1) + stride - mod(imin(1)-lb(1),stride)
endif
imin(1) = getindx(imin(1), lb(1), stride)
if (mod(imax(1)-lb(1),stride) .ne. 0) then
imax(1) = imax(1) - mod(imax(1)-lb(1),stride)
endif
imax(1) = getindx(imax(1), lb(1), stride)
mresult = 1
do 10 i = imin(1), imax(1)
if (q(1,i).le.0.d0) then
if (mout.gt.0) write(6,601) lb(1)+(i-imin(1))*stride,
& q(1,i),lb(1),ub(1),stride
mresult = 0
end if
p = gamma1*(q(3,i) - 0.5d0*(q(2,i)**2)/q(1,i))
if (p.le.0.d0) then
if (mout.gt.0) write(6,602) lb(1)+(i-imin(1))*stride,
& p,lb(1),ub(1),stride
mresult = 0
end if
10 continue
601 format('chk1eu: Error in rho (',i5,')',f16.8,
& ' on [(',i5,'),(',i5,'),(',i3,')]')
602 format('chk1eu: Error in p (',i5,')',f16.8,
& ' on [(',i5,'),(',i5,')](',i3,')]')
return
end