Modern computer codes for fluid behaviour in spaces defined by Finite Elements are surprisingly useful and effective, even on laptops. There are now plasma modules that can be used for simulating plasma generation in flowing gases typical of that in thruster nozzles. The basic science of isentropic flow up to “the cone of silence” can be studied along with the effect of the plasma heating changing the local sound speed. This is an active research area that would open employment opportunities in physics, chemistry, biology and engineering.