Assessment of a RANS Transition Model with Flapping Foils at Moderate Reynolds Numbers

Numerical simulations based on a high-order discontinuous Galerkin solver were performed to investigate two-dimensional flapping foils at moderate Reynolds numbers, moving with different prescribed harmonic motion laws. A Spalart–Allmaras RANS model and without an algebraic local transition modification was employed for the resolution of multiple kinematic configurations, considering both moderate-frequency large-amplitude high-frequency small-amplitude pure heaving. The propulsive performance airfoils two modelling approaches tested by referring experimental (scale-resolving) numerical data available in literature. results show increase effectiveness predicting loads when applying model. This is particularly true low Strouhal numbers when, after laminar separation leading edge, vorticity dynamics appears have strong effect forces exerted profile. Specifically, more accurately predicts wake topology emerging flow field, which primary influence thrust/drag generation.