摘要
Violent free surface flows with strong fluid-solid interactions can produce a tremendous pressure load on structures, resu- lting in elastic and even plastic deformations. Modeling hydro-elastic problems with structure deformations and a free surfaee 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.
Violent free surface flows with strong fluid-solid interactions can produce a tremendous pressure load on structures, resu- lting in elastic and even plastic deformations. Modeling hydro-elastic problems with structure deformations and a free surfaee 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.
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11172306,11232012 and81271650)
the New Century Excellent Talents(Grant No.NCET-10-0041)
the 100 Talents Programme of the Chinese Academy of Sciences
