Abstract
A series of monatomic gas flows over a cylinder, with a freestream Mach number of 4 and a range of Knudsen numbers, are used to evaluate the unified flow solver (UFS) code. The UFS code combines several compressible gas flow simulation schemes for application to flow problems involving a wide range of Knudsen number (Kn) regimes, and features capabilities for strong coupling between low-Kn and high-Kn schemes along with automatic tree-based grid adaptation. UFS simulation results are compared with results from simulations which employ other codes intended for the same class of problems, and good agreement is generally found. Areas identified for improvement in UFS include calculation of surface quantities and numerical performance of the UFS Boltzmann equation solver.
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