Abstract
Three-dimensional separated flows past bodies of revolution with conical afterbodies are studied both experimentally and numerically. The sudden increase in drag force due to the small increase in the semi-apex angle of the conical afterbody which is related to the critical geometry is revealed by force measurement and flow visualization. The details of the associated physical phenomenon, i. e. 3D separation and vortex shedding is elucidated by numerical simulations based on the finite-volume solution method for the Navier-Stokes equation in the curvilinear, boundary-fitted grid system. It is shown by the computer graphic drawings that the large-scale structure of separated vortices is composed of ring vortices and longitudinal vortices originating from the center of the ring vortices.
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