  The interaction of elementary waves for isentropic flow in a variable
cross-section duct is obtained (\cite{ShengZhang}). The authors have discussed
rarefaction wave or shock wave interacts with stationary wave. In this paper,
we extend their results to the nonisentropic flow. It can be proved that if one
changes $(u,\rho)$ plane in isentropic flow with $(u,p)$ plane in nonisentropic
case, the interaction results of rarefaction wave or shock wave with stationary
wave can be moved parallel from the isentropic case when contact discontinuity
is involved. Thus we mainly focus on the interactions between contact
discontinuity and stationary wave. Some numerical results are given to verify
our analysis. The results can apply to the interaction of more complicated wave
patterns.
