This study uses the non-intrusive generalized polynomial chaos method to investigate the effects of uncertainties in the gas-surface interaction model on the hypersonic boundary layer flow over a flat plate. In particular, the polynomial chaos method is applied to assess uncertainties in the surface shea, normal stress, heat flux, flowfield temperature and accomodation coefficient. The polynomial chaos approach allows us to estimate probability density functions from fewer flowfield samples than the traditional random Monte Carlo sampling. The flowfield solutions are computed by the DSMC code SMILE. The analysis shows that surface fluxes and flowfields in the hypersonic boundary layer are more sensitive to the accommodation coefficient than surface temperature uncertainty.


Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (M. Kulakhmetov*, A. Venkattraman*, and A. Alexeenko, “Effects of Uncertainty in Gas-Surface Interaction on DSMC Simulations of Hypersonic Flows”, AIP Conf. Proc., Vol. 1333, 27th International Symposium on Rarefied Gas Dynamics, pp. 452-457, 2011.) and may be found at http://dx.doi.org/10.1063/1.3562689. The following article has been submitted to/accepted by [American Institute of Physics]. After it is published, it will be found at (http://dx.doi.org/10.1063/1.3562689). Copyright (2011) M. Kulakhmetov*, A. Venkattraman*, and A. Alexeenko. This article is distributed under a Creative Commons Attribution 3.0 Unported License.

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