Uncertainty Quantification of Turbulence Model Applied to a Cavitating Hydrofoil

Abstract This paper presents the Global Sensitivity Analysis of coefficients standard k- ε turbulence model used in RANS (Reynolds Averaged Navier-Stokes) simulations aimed to predict flow around a bi-dimensional hydrofoil operating at non-cavitating and cavitating regimes. The sensitivity analysis is treated by Sobol Decomposition, where Indices are computed through Polynomial Chaos Expansion 2-nd order with Point-Collocation Non-Intrusive approach. From current results, it seems that considered regime less sensitive variability input parameters, least for prediction lift drag.