Abstract
The unified flow solver, a hybrid continuum-rarefied code, is used to investigate the structure of a normal shock wave as an entropy perturbation is introduced upstream of the shock and allowed to propagate through the shock. The entropy spot is introduced into a two-dimensional domain over a range of Knudsen numbers (Kn = 0.01, 0.1, and 1.0) for Mach 2.0 in argon. Previous work on entropy-shock interactions has only been reported with an Euler-solution-method scheme. Here, results are presented in argon, using coupled Bhatnagar-Gross-Krook and Navier-Stokes solvers, using the hybrid nature of the unified flow solver code for a better examination and understanding of the propagation of entropy disturbances. Density, pressure, and temperature profiles, as well as the profiles of their gradients, are reported at discrete intervals after the entropy spot convects through the shock.
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