CFD Calculations For Free-Surface-Piercing Low Aspect Ratio Circular Cylinder With Solution Verification And Comparison With Experiments
The flow around free-surface piercing, low aspect-ratio circular cylinder is investigated by means of unsteady Reynolds averaged Navier-Stokes (URANS) calculations together with verification procedures and comparison with small-scale experimental and Particle Image Velocimetry results. A two-phase interface capturing model is used to handle the free-surface flow, together with k-w SST turbulence model. We investigate physical and modeling aspects of this problem in order to gain more knowledge about the interaction of free-surface and free-end effects so that this mechanism is better understood and taken into account when modeling the problem in engineering-applied situations, such as the vortex induced motion of spars, tension-leg platforms and semi-submersibles. The case herein presented is a captive, low aspect-ratio cylinder (L=D = 2:0) with flow velocity corresponding to Reynolds and Froude numbers (both based on diameter) of Re =4.3E4 and FnD=0.31, respectively.