带自由面流体运动的单相格子Boltzmann方法模拟

采用Thurey提出的单相格子Boltzmann方法模拟了带自由面流体的运动.它在标准的单相模型的基础上将每个格子标记为气体、液体或自由面.格子的类型通过计算格子间的质量通量来重新初始化.与多相模型相比,它不需要求解气相格子的运动,提高了计算效率.针对此方法,给出了一种来流和出流边界条件的提法.最后,计算了来流被竖直圆柱阻挡,破碎成两股后又接合起来运动的动态过程.结果表明,此方法能描述来流经圆柱后高度降低,并形成涡等现象.

Single-phase lattice Boltzmann model for free-surface flow

The single-phase lattice Boltzmann method proposed by Thurey was used to solve free-surface flow problems. Based on the standard single-phase model,the method tags each cell with a corresponding type,e.g.gas,fluid or interface.The type is re-initialized by calculating the mass fluxes between neighboring cells.In contrast to the multi-phase models,simulating the gas phase motion is not needed,so the computation efficiency is improved.Inflow and outflow boundary conditions for the method were given to simulat...