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Shock tube problem

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Shock tube problem is a special case of Riemann problem with velocities on both sides of discontinuity set to zero. It is often used as a test case for validation of numerical codes, because analytical solutions are available.The initial condition is given by

 u=u_L=0 , p=p_L , \rho=\rho_L, x<0,
 u=u_R=0 , p=p_R , \rho=\rho_R, x>0.

A well-known special case is the Sod problem (Sod, 1978) with initial conditions

 p_L=1, \rho_L=1, p_R=0.1, \rho_R=0.125.
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