Uncertainties quantification of CFD-based flutter prediction

Righi, Marcello, Greco, Pietro and Da Ronch, Andrea (2021) Uncertainties quantification of CFD-based flutter prediction. In AIAA Scitech 2021 Forum. Aerospace Research Central.. (doi:10.2514/6.2021-1038).

Record type: Conference or Workshop Item (Paper)

Abstract

This study uses Non-Intrusive Polynomial Chaos Expansion (NIPCE) to propagate uncertainties related to flow parameters and geometry imperfections. The test case is a two-dimensional transonic aeroelastic problem, the extension to a three-dimensional test case is in progress. The main motivation behind this investigation is the large scatter observed in the results of the third test case of the Second aeroelastic Prediction Workshop. The analysis shows that plausible ranges of uncertainty associated with the chosen Random Variables generates a large scatter in quantities of interest such as Flutter Speed. The study also shows that NIPCE can be very effective and efficient in reducing the computational costs of such an investigation. The higher polynomial orders clearly show the non-linearity of the physics involved.

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