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SPH method in free surface flows and its application

Author: MaLiQiang
Tutor: ChangJianZhong
School: University of North
Course: Power Machinery and Engineering
Keywords: Free surface flow Smoothed particle hydrodynamics Dam Droplet splash
CLC: O352
Type: Master's thesis
Year: 2010
Downloads: 162
Quote: 0
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Abstract


Hydrodynamics of free surface flow phenomena widely exist in real life and engineering applications, is a highly complex nonlinear problems. Free surface during exercise may produce spatter, spreading, crushing, adhesion phenomena, and is constantly changing. Therefore, studying how to efficiently and accurately simulate the physical process has important theoretical and practical significance. Smoothed particle hydrodynamics (smoothed particle hydrodynamics, SPH) method is a pure form of meshless Lagrangian particle method SPH method developed rapidly in recent years, has been successfully applied to the bio-nano-engineering, environmental engineering and defense technology different areas. SPH method can easily handle large deformation of the deformable boundary, track free surface, movement of the interface. And traditional grid method, in a complex mesh generation, mesh adaptivity and multi-scale problem solving, etc., all have a unique advantage. This paper discusses in detail the basic equations of SPH method and rationale, as well as SPH method Navier-Stokes equations on the implementation. In numerical methods for density re-initialization, Asia particle scale turbulence model, artificial viscosity, artificial compression ratio, boundary treatment, variable smoothing length, nearest neighbor particle search method and other issues were discussed, in the process of adding a surface SPH tension calculations. On the other hand, this paper SPH method hydrodynamic flow of dam-break free surface flow problems and droplet splashing issues and mechanism of numerical simulation, and different numerical schemes were compared. Were not added to simulate the flow problems and obstacles dam dam flow problems adding obstacles, as well as a smooth solid surface splash droplets and droplet splashing liquid issues, analyzing the results of the numerical simulation on the numerical differences and correction terms Analog factor. Numerical simulation of flow in the dam, the flow through the dam issue SPH numerical simulation of different scenarios, this paper uses the simulation programs have been more complete flow arising from the interaction with the wall splash, fusion, water bounce The free surface changes and the near-wall flow pressure field of intense deformation variety of complex physical phenomena, the SPH numerical simulation of dam-break flow problems the results obtained with experimental observations, moving particle semi-implicit (Moving Particle Semi-implicit, MPS) method to get the results, and the application of commercial CFD software VOF (Volume of Fluid) results of model calculations were compared and analyzed. Numerical simulation of droplet splashing the SPH question the results obtained with experimental observations, least squares particle finite element method (LSPFEM) the results obtained were compared and analyzed to verify the improvement program as well as the reliability and programmed calculation results accuracy.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Hydrodynamic
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