Gasdynamic processes in a pulsed subsonic viscous gas stream

An inviscid gas model is used to study the gasdynamics induced in a flowing gas in a closed channel by an abrupt input of energy. Note is taken of fast acoustic and slow diffusive stages of gas flow. The gas is injected through porous walls and moves along a pressure differential. Equations are defined for conservations of mass, momentum and energy in order to describe the repeated interaction of shock waves among themselves and the channel walls. At a Mach 0.05 speed, modified Navier-Stokes equations drive a simulation which reveals the formation of vortices which drift downstream and suck gas into the channel. Hot gas is first expelled from the bottom wall.