两相混合层中颗粒运动的数值模拟

本文采用离散涡方法对平板混合层流动进行了数值模拟，得到了与实验完全定量符合的速度场。再用单向耦合方法模拟了混合层流场中颗粒的运动。分析了混合层流动中大尺度涡结构及Ｓｔｏｋｅｓ数对颗粒扩散的影响。与前人工作中所采用的每个时间步一个颗粒在固定的位置进入计算域的方法不同，本文中每个时间步有多个颗粒在入口处以随机的横向位置进入计算域。因此，在不需增加太多计算量的基础上，计算域中可以包含足够多的颗粒以获得较精确的统计结果。采用本文方法得到的颗粒速度场与实验结果定量符合得很好。

NUMERICAL SIMULATION OF PARTICLE MOTION IN TWO--PHASE MIXING LAYER

The plane mixing layer flow is numerically simulated by the discrete vortexmethod. Mean velocities of fluid phase agree well with experimental measurements. Bymeans of the one-way coupling method, the particles are tracked in the mixing layer flow.The influence of large vortex structures and particle Stokes number on particle dispersion isanalyzed. Instead of a single particle at a determined position in the previous work, severalparticles at stochastic positions are added into the flow field at each time step from theinlet section. Therefore, without increasing much calculation time, sufficient particles canbe included in the computational domain for a more precise statistical result. Predictions ofparticle velocities also agree well with the experimental results.