Numerical simulation of a fixed and an oscillating circular cylinder in oscillatory flow

The proposed paper aims to present a parametrical analysis via CFD (Computational Fluid Dynamics) of the drag amplification factor of a cylinder in a current superposed to an in-line oscillatory velocity. Numerical simulations based on a two-dimensional discrete vortex method with viscous diffusion have been carried out in order to obtain the drag amplification factor against U(0)/U(1) (the relation between the uniform velocity U(0) and the oscillatory-velocity amplitude U(1)) for various values of KC (the Keulegan-Carpenter number). Furthermore, the oscillatory flow superposed to a current when the cylinder is free to oscillate transversely is analysed.