Assessment Of Urans Modeling Of Dynamic Stall Via Reynolds Stress Tensor Perturbations

Abstract

We explore diverse strategies to perform a credibility assessment of predictions from the unsteady Reynolds-Averaged Navier-Stokes (URANS) model. In particular, we consider the epistemic uncertainty in the turbulence closure and compute uncertainty estimates using the Eigenspace Perturbation Method. The novelty lies in the application, which regards unsteady use cases of interest to aeronautics. The time-series of predicted quantities of interest are subject to Power Spectral Density and coherence analysis. Results show that the credibility assessment should consider multiple quantities of interest at once.