Uncertainty Estimation Based on Global Sensitivity Analysis for CFD Simulations of Supersonic Flow Over Missile

Kadu, Pravin Ananta (2016) Uncertainty Estimation Based on Global Sensitivity Analysis for CFD Simulations of Supersonic Flow Over Missile. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Though Computational Fluid Dynamics (CFD) approach has proven itself as a cost-e ective in designing of missiles, CFD simulations cannot accurately estimate the experimental data due to such reasons as unphysical sub-models, insufficient resolution, inaccurate boundary conditions, and initial conditions, etc. To account the uncertainty due to such sources, Global Sensitivity Analysis (GSA) approach is proposed in the current work of supersonic ow over cruciform missile of ogive-cylinder fuselage-wings- ns con guration. The output parameters of interest considered are the coefficient of rolling moment, the coefficient of drag, and coefficient of lift. A grid convergence study is done to check grid independence and Grid Convergence Index (GCI) for these global coefficients, and local mach number and stagnation pressure change eld variables are estimated. A nominal case is established. Global Sensitivity Analysis is performed by perturbation of the parameters from their nominal case value after identifying the sources of uncertainty and the input variables with greater in uence on output global parameters are identi ed.

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