A numerical analysis of unsteady separated flow by discrete vortex model using boundary element method

A new discrete vortex method combined with a singularity method has been developed for the analysis of unsteady separated flow. The method can easily be applied to a body of complicated shape. The strength of the nascent vortex and its position are studied by considering the vortices at the surface as approximating the boundary layer and the boundary layer as detached from the separation point and growing into the shear layer. Numerical calculations are performed for a square prism with angles of attack of 0 deg, 10 deg, 20 deg, and 30 deg are found to be in good agreement with experimental data.