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#EXTREME INJECTOR V3.7.3 .RA MANUAL#
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“ NASA Armstrong Fact Sheet: Hyper-X Program ,” NASA TV, Feb. 2014. Sets of closure coefficients that contribute most to solution uncertainty for each turbulence model were identified, which warrant further investigation because more knowledge about the effects of these coefficients is expected to reduce the uncertainty in the numerical design of scramjet isolators. The results obtained were compared to experimental data as well as to previous work focusing on relevant flow problems. Nonintrusive polynomial chaos theory was used for efficient uncertainty propagation, and Sobol indices were employed to establish relative sensitivities of the flow solution to closure coefficients. The Menter baseline, Menter shear stress transport, Spalart–Allmaras, and Wilcox-2006 k − ω turbulence models were examined and simulations were carried out using the VULCAN flow solver. The goal of this work was to quantify the uncertainty in the solution of a scramjet isolator flowfield due to the uncertainty in the closure coefficients of commonly used turbulence models in Reynolds-averaged Navier–Stokes simulations.