颗粒圆孔射流碰撞并行直接数值模拟算法研究

本文对空间模式发展的颗粒圆孔射流碰撞进行了并行直接数值模拟算法研究。气相采用可压缩的N-S方程直接求解。颗粒相采用Lagrangian方法跟踪实际的颗粒运动。利用并行求解算法,实现了颗粒穿越边界面的模拟以及高效颗粒碰撞算法。考虑了颗粒和流体的双相耦合以及颗粒之间的碰撞。在本文的计算条件下,颗粒的直径远小于网格的间距,平均的Kolmogorov尺度和网格的间距在一个量级。气相和颗粒相的应力与实验的对比研究表明,本文的颗粒并行程序是可信的。

Direct Numerical Simulation of Parallel Collision Algorithms for A Particle Laden Round Jet

The particle collision algorithms for the particle laden round jet are investigated in this paper by the DNS method.The compressible Navier Stokes equations are solved for the fluid phase. The Euler-Lagrangian method is used for the particle phase.The parallel algorithms for the particles passing through the computational boundary and efficient collisions algorithms for the particles are proposed in this paper.Two-way coupling and particle collision are considered in our DNS simulation. The particle diameter is far less than the grid spacing,and the mean Kolmogorov spacing is the same order with the grid spacing.By the comparisons between the Reynolds stresses for the particle and fluid phase,it further validates our parallel particle collision algorithms.