Abstract
This paper presents an investigation of low-Reynolds-number flows past an SD7003 airfoil at Re = 60K, where transition takes place across a laminar separation bubble (LSB). Results of experimental measurements and numerical calculations are analyzed and discussed. In particular, reasonably good results were obtained using three different numerical approaches: Large-eddy simulation (LES) that demonstrated vortical structures at different transition stages, and where the transition occurred naturally; unsteady Reynolds-averaged Navier-Stokes (URANS) simulations for several turbulence models based on the ω-length-scale equation, coupled to a linear stability solver to predict transition point; URANS simulations using a low-Re k-e turbulence model, where eddy viscosity was suppressed in the near-wall laminar region by damping functions.
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