Vorticity Shedding from a Lentil-Shaped Body at Large Incidence in Uniform Flow

The 2D flow about a lentil-shaped body at high incidence in uniform stream is numerically simulated for high Reynolds numbers. The separation points are fixed on the body edges and the vorticity released through a Kutta-like condition is spatially discretized by point vortices. Their Lagrangian inviscid dynamics is described by using both a conformal mapping and a boundary elements method. The present results are in good agreement with previous calculations but still not satisfactory when compared with the experiments. The aim of the present work is to investigate the effect of different Kutta conditions and the effect of different amalgamation procedures in the far wake on global quantities such as the Strouhal number or the total shed circulation. Other remarkable effects induced either by the action of viscosity or by the rising of secondary 3D motion, may not be analyzed by the present simplified model.