湍流边界层中固体颗粒运动的数值模拟

根据Ｌａｇｒａｎｇｅ颗粒运动微分方程及不可压缩湍流边界层中流体的壁面速度分布规律，数值求解了颗粒在湍流边界层中的运动，考虑了Ｓａｆｆｍａｎ升为对颗粒运动的影响，壁面对运动阻力的影响，给出了固体颗粒沉积边壁，在边界层外缘上所需的最小速度和最小入射角，计算结果还表明边界层对固体颗粒撞击边壁的速度和入射角有较大影响，从数值结果可可以发现一个重要现象。

A NUMERICAL SIMULATION OF THE MOTION OF SOLID PARTICLES IN TURBULENT BOUNDARY LAYERS

The motion of solid particles in incompressible turbulent boundary layers may be numerically simulated using the Lagrangian equations of the motion of the particles and the law of distribution of velocities of the fluid on the wall, due considerations having been taken on the influences of the Saffman lift force on the particles' motion and the resistance of the wall upon the motion. The minimum incidence velocities and angles of the particles at the edge of the turbulent boundary layers toward the wall, on which they may deposit, are presented for different particle sizes and particle velocities. By means of the model of collision of particles upon the wall, the procedure of the influence of boundary layer flow on the impingement on the wall is simulated. An interesting fact from this numerical simulation is that the velocity of the particle always leads to the fluid close to the wall.