Numerical simulation of hydro-elastic problems with smoothed particle hydrodynamics method |
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Authors: | LIU Mou-bin SHAO Jia-ru LI Hui-qi |
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Affiliation: | [1]Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China] [2]School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | Violent free surface flows with strong fluid-solid interactions can produce a tremendous pressure load on structures, resulting in elastic and even plastic deformations. Modeling hydro-elastic problems with structure deformations and a free surface breakup is difficult by using routine numerical methods. This paper presents an improved Smoothed Particle Hydrodynamics (SPH) method for modeling hydro-elastic problems. The fluid particles are used to model the free surface flows governed by Navier-Stokes equations, and the solid particles are used to model the dynamic movement and deformation of the elastic solid objects. The improved SPH method employs a Kernel Gradient Correction (KGC) technique to improve the computational accuracy and a Fluid-Solid Interface Treatment (FSIT) algorithm with the interface fluid and solid particles being treated as the virtual particles against their counterparts and a soft repulsive force to prevent the penetration and a corrective density approximation scheme to remove the numerical oscillations. Three typical numerical examples are simulated, including a head-on collision of two rubber rings, the dam break with an elastic gate and the water impact onto a forefront elastic plate. The obtained SPH results agree well with experimental observations and numerical results from other sources. |
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Keywords: | Smoothed Particle Hydrodynamics (SPH) hydro-elasticity Fluid-Structure Interaction (FSI) artificial stress |
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