SPH统一算法对自由流体冲击弹性结构体问题模拟

Numerical simulation of free surface flow impacting elastic structure with SPH uniform method

对自由流体冲击弹性结构体涉及的自由界面运动、弹塑性变形、流固耦合作用等问题进行模拟时要求能有效计算介质运动变形与流固间耦合作用。利用光滑粒子流体动力学方法将流体、弹性体视为连续介质,用统一的N-S方程与虚拟压缩状态方程求解。基于初始粒子类型划分提出新的介质接触算法,通过在结构体表面增加结构体表面粒子,使流体与弹性体介质间相互作用实现稳定传递。计算结果表明,所用SPH统一算法与接触算法能准确有效模拟自由流体冲击弹性结构体变形回弹过程。

Free surface flow impacting elastic structure is a common problem, usually referring to interface track, elastic or plastic structural deformation and fluid-structure interaction. To simulate these problems, it has to capture the deformation of interfacial flow and compute the fluid structure coupling interaction accurately. A smoothing particle hydrodynamics （SPH） uniform method where both fluid and solid phases are described by SPH was presented and the uniform continuous medium governing equations and week pressure state equation were solved. A new contact algorithm with the structure surface particles treated as virtual particles was developed. The virtual particles were defined in initial particle configuration, containing both fluid and structure particle characters and producing repulsive force to prevent penetration. Comparing the numerical results with experimental ones, it is demonstrated that the SPH uniform method with the new contact algorithm can be used to simulate the free surface flow impacting elastic structure problem easily and accurately.