Abstract
One of the most important issues in CFD modeling of ablation process is the formulation of boundar y conditions at the gas -surface interface. These boundary conditions cannot be obtained without analytical or parametric numerical modeling of the Knudsen layer formed near the evaporating surface. Analytical models are therefore of interest for numerical simulation of ablating flows. Recently Pekker, Keidar, and Cambier developed a new analytical model of the Knudsen layer, which takes into account the tempe rature gradient in the bulk gas. This model uses a bimodal velocity distribution function which pres erves the laws of conservation of mass, momentum, and energy within the Knudsen layer and converges to the Chapman -Enskog velocity distribution function at the outer boundary of the Knudsen layer. The main objective of this work is to provide detailed an alysis of the applicability of this analytical model of the Knudsen l ayer by comparison of its predictions with the numerical solution s of the ES -BGK model kinetic equation and DSMC results.
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