关键词: 关 键 词：流体模拟, 固壁边界, 边界力法, 虚粒子法, 速度修正

Abstract: Abstract: The study of solid boundary treatment method has been a difficult problem in fluid simulation. The common methods of solid boundary treatment are boundary force method and virtual particle method. The boundary force method prevents fluid particles from penetrating the boundary by exerting force on the fluid particles near the boundary, but this method has too many parameters and the force is difficult to adjust, and the boundary truncation error will occur in the calculation. The virtual particle method solves the problem of boundary truncation error by generating virtual particles outside the boundary. However, when dealing with complex boundary problems, the generation of virtual particles is difficult, and the calculation accuracy will be affected due to the uneven distribution of virtual particles, which leads to particles to disperse. To solve these problems, the paper presents a new method for the treatment of solid boundary based on velocity correction, which does not need to solve the boundary force or generate virtual particles outside the boundary. The momentum equation and the velocity consumption are used directly to calculate the rebound velocity of the fluid particles when they hit the boundary, which greatly reduces the complexity of the boundary treatment. It also overcomes the problem of the instability of the boundary force method and the virtual particle method caused by the uneven sampling of particles at the corner of the boundary. Simulation results show that the proposed method is more stable and more efficient than traditional methods above, and with the increase of the number of particles, the time consuming of this method is also slower than that of the two methods, and the advantage of high computational efficiency is more obvious and the simulation effect of complex scene is also better.

Key words: Keywords: fluid simulation, solid boundary, boundary force method, virtual particle method, velocity correction