src/3d/equations/euler/rp/flx3eu.f

```c
c =========================================================
subroutine flx3(ixyz,maxmx,meqn,mbc,mx,q,maux,aux,f)
c =========================================================
c
c     # Flux-function for the three-dimensional Euler equations.
c
c     # The flux is computed in x-direction if ixyz=1
c     #                              or in y-direction if ixyz=2
c     #                              or in z-direction if ixyz=3.
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)
dimension q(1-mbc:maxmx+mbc, meqn)
dimension aux(1-mbc:maxmx+mbc, maux, 3)
dimension f(1-mbc:maxmx+mbc, meqn)
common /param/  gamma,gamma1
c
if(ixyz .eq. 1)then
mu = 2
mv = 3
mw = 4
else if(ixyz .eq. 2)then
mu = 3
mv = 4
mw = 2
else
mu = 4
mv = 2
mw = 3
endif
c
do i=1-mbc,mx+mbc
u = q(i,mu)/q(i,1)
v = q(i,mv)/q(i,1)
w = q(i,mw)/q(i,1)
p = gamma1*(q(i,5) - 0.5d0*q(i,1)*(u**2+v**2+w**2))
f(i,1)  =   q(i,mu)
f(i,mu) = u*q(i,mu)+p
f(i,mv) = v*q(i,mu)
f(i,mw) = w*q(i,mu)
f(i,5)  = u*(q(i,5)+p)
enddo
c
return
end
```

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