Riemann problem for non-ideal polytropic magnetogasdynamic flow.

The main motive of the present paper is to derive the analytical solution of the Riemann problem for magnetogasdynamic equations governing an inviscid unsteady one-dimensional flow of non-ideal polytropic gas subjected to the transverse magnetic field with infinite electrical conductivity. By using the Lax entropy condition and R–H conditions, we derive the elementary wave solutions i.e. shock wave, simple wave and contact discontinuities without any restriction on the magnitude of initial data states and discussed about their properties. Further, the density and velocity distribution in the flow field for the cases of compressive wave and rarefaction wave is discussed. Here we also compare/contrast the nature of solution in non-ideal magnetogasdynamic flow and ideal gas flow. • Solution of the Riemann Problem for non-ideal magnetogasdynamics flow is obtained. • Lax entropy and R–H conditions are used to derive elementary wave solutions. • Density and velocity profiles for 1- and 3-shock wave is presented. • Effect of non-idealness of the gas in the presence of magnetic field is analyzed. [ABSTRACT FROM AUTHOR]