Abstract
This paper outlines the effects of grid refinements and turbulence models on shipgenerated waves in modelling of turbulent free-surface flows around modern transom stern ships. The computation is performed in a numerical water tank based on the FINFLO-RANS code developed at Helsinki University of Technology. Using a moving mesh, a free surface can be tracked, in which the free-surface boundary conditions are given on the actual location of the free surface. A cell-centered finitevolume multigrid scheme is implemented. Three grid levels with a grid refinement ratio of 2 are constructed. Two turbulence models, such as Baldwin-Lomax's model and Chien's low Reynolds number k-ε model, are selected. Test case is the KCS model from the KRISO container ship (Korea). This is one of three benchmark test cases recommended by the Gothenburg 2000 Workshop in ship hydrodynamics on CFD. The calculated results are presented in terms of ship resistance, wave patterns, and turbulent flow. Furthermore, the convergence performances at the different grids are studied, and the influences of the grid density and turbulence models on the wave systems of a ship are discussed.
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