扁球体泥沙颗粒沉降的三维格子Boltzmann模型

Three dimensional Lattice Boltzmann model for settling of oblate spheroid sediment particles

应用格子Boltzmann方法(Lattice Boltzmann Method,LBM)模拟扁球体单颗粒沉降,并引入大涡模拟(Large Eddy Simulation,LES)描述较大颗粒沉降引起的尾流紊动,建立了扁球状泥沙颗粒沉降的三维数值模型。利用该模型对不同雷诺数下(1～7 580)扁球体泥沙颗粒的静水沉降进行了验证模拟。数值模拟结果与已有试验数据相比较,在泥沙颗粒沉降轨迹、沉降速度和阻力系数等方面有较好的一致性。

A three-dimensional model for the settling of spheroid sediment particles is developed by applying the Lattice Boltzmann Model（LBM） for the simulation of the settling of an oblate spheroid particle,and using the Large Eddy Simulation（LES）for the description of the wake turbulence of a large particle.Simulations of a single oblate spheroid particle settling with different Re（1~7 580） are carried out through the presented model,and the simulated results are compared with the previous experimental data.The simulated settling trajectory,velocity and drag coefficient agree well with the measured data.