Title

Uncertainty Analysis of Fluid-Structure Interaction of a Deformable Hypersonic Inflatable Aerodynamic Decelerator

Abstract

The objectiveofthis paper is topresent the resultsofadetailed uncertainty analysis for high-fidelity fluid-structure interaction modeling of a deformable hypersonic inflatable aerodynamic decelerator at peak heating conditions for lifting Mars entry with a turbulent flow assumption. Uncertainty results are presented for the structural deformation response and surface conditions (pressure, shear stress, and convective heat transfer) of the inflatable decelerator with an efficient polynomial chaos expansion approach. The uncertainty results are compared with results obtained in a previous study for ballistic Mars entry. Approximately half of the flowfield and structural modeling uncertainties show at least 90% combinedcontributiontotheinflatable decelerator deflection and resulting surface condition uncertainties. For lifting Mars entry, global nonlinear sensitivity analysis shows that the tensile stiffness of the inflatable structure's axial cords and radial straps and the torus torsional and tensile stiffnesses are the main contributors to the inflatable decelerator deflection uncertainty. As a result of these structural uncertainty contributions, the shape deformation contributes up to 10% of the uncertainty in the surface conditions. However, the freestream density dominates the uncertainty in the surface conditions experienced by the inflatable decelerator. In addition, the CO2-CO2 binary collision interaction is a significant contributor to aerodynamic heating and shear stress uncertainty.

Department(s)

Mechanical and Aerospace Engineering

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

Aerodynamics; Carbon Dioxide; Deceleration; Deformation; Fluid Structure Interaction; Heat Convection; Heat Transfer; Inflatable Structures; Lift; Sensitivity Analysis; Shear Stress; Stiffness; Structural Analysis; Aerodynamic Decelerators; Convective Heat Transfer; Heating Conditions; Nonlinear Sensitivity Analysis; Polynomial Chaos Expansion; Structural Deformation; Structural Modeling; Structural Uncertainty; Uncertainty Analysis

International Standard Serial Number (ISSN)

0022-4650

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2016 Andrew J. Brune, Serhat Hosder and Karl T. Edquist, All rights reserved.


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