Title

Uncertainty Quantification of Hypersonic Reentry Flows with Sparse Sampling and Stochastic Expansions

Abstract

The objective of this study was to introduce a combined sparse sampling and stochastic expansion approach for efficient and accurate uncertainty quantification. The new techniques are applied to high-fidelity, hypersonic reentry flow simulations, which may contain large numbers of aleatory and epistemic uncertainties. Stochastic expansion coefficients were obtained using the point-collocation nonintrusive polynomial chaos technique with a number of samples less than the minimum number required for a total-order expansion. This study introduced two methods of measuring the accuracy of the expansion coefficients, as well as their convergence with iteratively increasing sample size. The newly developed approaches were demonstrated on two model problems. The first was a model for stagnation point, convective heat transfer in hypersonic flow. Mixed uncertainty quantification analysis results showed that accurate expansion coefficients could be obtained with half of the minimum number of samples required for a total-order expansion. The second problem was a high-fidelity, computational fluid dynamics model for radiative heat flux prediction on a hypersonic inflatable aerodynamic decelerator during Mars entry. The model consisted of 93 uncertain parameters, coming from both flowfield and radiation modeling. Results indicated that an accurate surrogate model could be obtained with only about 15% of the number of samples required for a total-order expansion when compared with previous work.

Department(s)

Mechanical and Aerospace Engineering

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

Compressed Sensing; Computational Fluid Dynamics; Heat Convection; Heat Flux; Heat Transfer; Hypersonic Flow; Iterative Methods; Reentry; Stochastic Systems; Aerodynamic Decelerators; Aleatory and Epistemic Uncertainties; Computational Fluid Dynamics Modeling; Convective Heat Transfer; Expansion Coefficients; Polynomial Chaos Techniques; Radiative Heat Fluxes; Uncertainty Quantifications; Uncertainty Analysis

International Standard Serial Number (ISSN)

0022-4650

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Thomas West and Serhat Hosder, All rights reserved.

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