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LARGE EDDY SIMULATION OF FREE SURFACE FLOW

Hua Ji
Department of Mechanical Engineering, University of Waterloo Waterloo, Ontario N2L 3G1, Canada

Fue-Sang Lien
Department of Mechanical Engineering, University of Waterloo Waterloo, Ontario, N2L 3G1, Canada

Al B. Strong
Department of Mechanical Engineering, University of Waterloo Waterloo, Ontario, N2L 3G1, Canada

Resumo

A front tracking method is developed for three dimensional free surface problems. Triangulated surface meshes are used to represent the free surface and compute the geometric parameters. The volume fraction of fluid and the surface area cut by the interface in a Cartesian control volume are computed in terms of boolean operations. The normal stress boundary conditions are added at the exact location of the interface. The tangential stress boundary conditions are enhanced with the least squares technique when the velocity boundary conditions are extrapolated. The Cartesian grid method (or cut-cell method) is used to discretize the governing equations and treat the interface as a sharp discontinuity. This method is applied to implement LES of free surface flows in an open channel with small amplitude waves. The numerical results are in excellent agreement with experimental and DNS data.