Uncertainty Analysis of Mars Entry Flows Over a Hypersonic Inflatable Aerodynamic Decelerator

Abstract

A detailed uncertainty analysis for high-fidelity flowfield simulations over a fixed aeroshell of hypersonic inflatable aerodynamic decelerator scale for Mars entry is presented for fully laminar and turbulent flows at peak stagnationpoint heating conditions. This study implements a sparse-collocation approach based on stochastic expansions for efficient and accurate uncertainty quantification under a large number of uncertainty sources in the computational model. The convective and radiative heating and shear stress uncertainties are computed over the hypersonic inflatable aerodynamic decelerator surface and are shown to vary duetoa small fractionof 65flowfield and radiation modeling parameters considered in the uncertainty analysis. The main contributors to the convective heating uncertainty near the stagnation point are the CO2-CO2, CO2-O, and CO-O binary collision interactions, freestream density, and freestream velocity for both boundary-layer flows. In laminar flow, exothermic recombination reactions are more important at the shoulder. The main contributors to radiative heating at the nose and flank were the CO2 dissociation rate and CO heavy-particle excitation rates, whereas the freestream density showed importance toward the shoulder. The CO2-CO2 interaction and freestream velocity and density control the wall shear stress uncertainty.

Department(s)

Mechanical and Aerospace Engineering

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

Aerodynamics; Boundary Layer Flow; Boundary Layers; Dissociation; Heat Radiation; Heating; Laminar Flow; Radiant Heating; Shear Flow; Shear Stress; Stochastic Models; Stochastic Systems; Aerodynamic Decelerators; Collocation Approaches; Computational Model; Flow Field Simulation; Free-Stream Velocity; Laminar and Turbulent Flow; Recombination Reactions; 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 Andrew J. Brune, Thomas K. West IV, Serhat Hosder and Karl T. Edquist, All rights reserved.

Publication Date

01 Jan 2015

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