Shock wave reflection from a short orifice open to vacuum

Abstract

We study axisymmetric time-dependent problem of reflection of a shock wave running into the wall with a short orifice and associated rarefied gas flow into vacuum through a pipe. The main characteristics under consideration are the mass flow rate through the pipe and its transition to the constant value, the influence of the orifice presence, pipe relative length and Knudsen number on the reflected shock wave velocity. The analysis is based on the numerical solution of the S-model kinetic equation using the second-order accurate finite volume method, implemented into the “Nesvetay-3D” software package.