ABSTRACT
A three-dimensional numerical study has been undertaken to investigate the interactions of free-surface flows and a surface-piercing circular cylinder. A two-phase flow model has been developed and the large-eddy simulation (LES) approach has been adopted in the study, for which the filtered Navier-Stokes equations are solved and the dynnamic Smagorinsky sub-grid model is employed to compute the unresolved scales of turbulence. The governing equations have been discretised using the finite volume method, with the air-water interface being captured using a volume of fluid method and the cut cell method being implemented to deal with complex geometry in the Cartesian grid. The LES code is validated with the help of a benchmark problem for dam-break flows, and it is demonstrated that the free-surface is captured successfully by the code. Detailed free surface profile and vortical structures in the vicinity of the cylinder are shown and discussed.
