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Application of SPH Method in Large Eddy Simulation of High-Speed Free-Surface Flow

Author(s): Akihiko Nakayama, Kin Hong Tan

Linked Author(s): Akihiko Nakayama

Keywords: SPH; Free-surface flow; LES;

Abstract: The Weakly Compressible Smoothed Particle Hydrodynamics (SPH) has been reformulated to simulate high-speed free-surface flows such as skimming flows over steep slopes and ski jump flows with high turbulence and large fluctution of the free surface. The modeling of the un-resolvable motion has been done following the wall unresolved Large Eddy Sumulation formulated in fixed grid methods. The effects of the solid boundaries, in particular, have been incorporated by formulating the equations of motion separately from the particles away from solid boundaries by using the wall law similarities valid for turbulent flows over smooth and rough surfaces as well as laminar flow depending on the Reynolds number and the resolution by the given number of particles and the spacings. The single-phase method has been tested in the calculation of dam-break flow comparing with the results obtained by using the open-source code, DualSPHysics. The present method is shown to be as good as or better than DualSPhysics. The method is then appplied to simulate high-speed free-surface flows.


Year: 2019

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