An unsteady, three-dimensional, overset-grid, Reynolds-Averaged Navier-Stokes (RANS) method is applied to the problem of vortex shedding behind fixed and moving circular cylinders. The flows selected for study are of particular interest to the offshore industry in that they represent various modes of riser excitation and response. Three distinct sets of simulations are presented with the objective of validating the method: stationary cylinders; cylinders undergoing forced motion; and cylinders free to undergo Vortex-Induced Vibration (VIV). A limited number of high-resolution simulations are also presented to investigate the impact of small, spanwise phenomena such as “braid” vortices.
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