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Thermal rarefied gas flow investigations through micro/nano backward-facing step : Comparison of DSMC and CFD subject to hybrid slip and jump boundary conditions. Numerical Heat Transfer Part A: Applications, 66 (7). pp. 733-755.

A new Computational Fluid Dynamics (CFD) solver for high-speed viscous §ows in the OpenFOAM code is validated against published experimental data and Direct Simulation Monte Carlo (DSMC) results. The laminar §at plate and circular cylinder cases are studied for Mach numbers, Ma, ranging from 6 to 12.7, and with argon and nitrogen as working gases. Simulation results for the laminar §at plate cases show that the combination of accommodation coe©cient values σ u = 0.7 and σ T = 1.0 in the Maxwell/Smoluchowski conditions, and the coe©cient values A 1 = 1.5 and A 2 = 1.0 in the second-order velocity slip condition, give best agreement with experimental data of surface pressure. The values σ u = 0.7 and σ T = 1.0 also give good agreement with DSMC data of surface pressure at the stagnation point in the circular cylinder case at Kn = 0.25. The Langmuir surface adsorption condition is also tested for the laminar §at plate case, but initial results were not as good as the Maxwell/Smoluchowski boundary conditions.

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