非均匀来流对三维气固圆柱尾迹的影响

对非均匀来流三维气固两相尾迹流动做了直接数值模拟。气相流场采用高精度紧致差分法的数值方法对N-S方程组进行直接求解。计算颗粒场时,选取Stokes数等于1的颗粒,并采用Lagarangian方法跟踪其运动。颗粒与壁面采用弹性碰撞方法模拟。分析了非均匀来流(Re=260)的情况下扰动对流场特性的影响以及对颗粒扩散的影响。模拟结果表明:入口处的扰动加速了三维大涡的形成以及流体的紊乱以及颗粒在流场中的扩散程度。

INFLUENCE OF NON-UNIFORM INFLOW UPON THE THREE-DIMENSIONAL GAS-SOLID CYLINDER WAKE

A direct numerical simulation for threedimensional gas-solid two-phase wake flow of a non-uniform inflow has been carried out.For gas-phase flow field,a highly accurate and compact finite difference method is used to solve directly the N-S equations.For calculating the particles' field,Langrangian approach is used to trace the motion of particles with stocks number to be equal to 1.Particle collison with wall surface is simulated by using elastic collison method.Under condition of non-uniform inflow(Re=260),the influence of disturbance upon flow field characteristics and upon particles' diffusion has been analysed.Results of simulation show that the disturbance at inlet accelerates the formation of big vortex,increasing disorder of the fluid,and enhancing the diffusion degree of particles in the fluid.