The structure of a centered rarefaction wave in a relaxing ideal gas is studied theoretically, both analytically and numerically, with neglect of the Navier-Stokes terms (viscosity, etc.) in the hydrodynamic equations. The role of the ``frozen'' sound speed is clarified, in that it is shown that there is a transition from ``frozen'' flow at short times to equilibrium flow at long times.
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Wood et al. (1958) studied this question.
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