Abstract:Structural damage caused by fluid impact is widespread in natural disasters, coastal and offshore engineering. Grid-based method has inherent difficulties in simulating fluid with free surface and structure with crack. In order to solve these kinds of problems, a comprehensive numerical model based on Smoothed Particle Hydrodynamics (SPH) and Peridynamics (PD) is proposed. The kernel of the proposed model focuses on applying the idea of dynamic boundary conditions. Considering the similarity of SPH and PD in numerical process, an appropriate smooth length was determined to identify the fluid-structure interface automatically. Correspondingly, the fluid-structure interaction was implemented by exchanging the data on the fluid-structure interface. This method avoids the difficulty of applying essential boundary conditions in meshless method. The SPH-PD method combines the advantages of SPH in dealing with free surface flow and PD in analyzing material fracture process and can simulate complex FSI problems. At the end of this paper, a 2D FSI problem is simulated with the proposed SPH-PD method, and the failure of the solid region after large deformation is successfully captured.
Key words: fluid-structure interaction; smoothed particle hydrodynamics, SPH; peridynamics, PD; dynamic boundary condition; mesh free method; structure failure
时浩天,郭力. 模拟流体冲击致结构破坏问题的SPH-PD耦合方法[J]. 振动与冲击, 2022, 41(17): 170-176.
SHI Haotian, GUO Li. SPH-PD coupled method for simulation of structure failure impacted by fluid. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(17): 170-176.
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