Computation For The Thickness Of Shock Wave

The shock wave is a basic phenomena in supersonic flow.As the viscosity and thermal conduction of fluids exist,the thickness of shock wave must be not ignored.How to solve the thickness of shock wave is an important subject.In this paper,an method different from others is introduced which the distribution function is written in the Sonine polynomial series,and then substituted into the Boltzmann equation for timely uniform gas.After the Boltzmann equation is integrated over the speed space R~3,we find a series of equations about coefficients of expansion.When the zeroth coefficient was defined,others can be easily obtained.In third chapter,the theory of expansion is introduced to shock wave.The computation indicates that we can get a good result.When the upstream mach number is 2,the thickness of the normal shock wave is about 5 proportional to the upstream mean free path.