A NUMERICAL STUDY OF TWO-DIMENSIONAL SEPARATED FLOW PAST BLUFF-BODIES AT MODERATE KC-NUMBERS

A numerical model has been used to study separated flow around two-dimensional bodies in harmonically oscillating incoming flow. The work is based on a thin free shear layer method which assumes that the vorticity is concentrated in thin boundary layers around the body and in thin free shear layers. A flat plate and a midship cross section with bilge keels have been used. The separation points are assumed to be fixed at the sharp edge of the plate or bilge keel. The inline force has been calculated and the drag and inertia coefficients have been found. The results are in good agreement with experiments, although the drag coefficient is somewhat under-estimated, especially for midship section with short bilge keels.