Investigation of Particle-Turbulence Interactions Near Boundaries By Direct Numerical Simulation

目的是建立一种双向耦合伪谱方法，用于直接数值模拟壁面附近悬浮液的湍流。采用拉格朗日-欧拉方法的粒子。粒子效应将通过联合两步连续计算来引入。在第一步中，将模拟流体流场，然后模拟每个颗粒的流动。结果将与边界层中的两相流显示结果进行比较。计算机程序可以处理湍流场中的大量粒子。本文提出的直接数值模拟方法可以提高对两相流微观结构的理解，并为平均流动方程中的本构关系提供不同的两相流统计数据。

The objective is a two-way coupling pseudo-spectral method for the direct numerical simulation of turbulent flow of suspensions near a wall. A particle following Lagrangian - Eulerian approach will be adopted. The particle effect will be introduced by a combined two-step successive computational. In the first step, the fluid flow field will be simulated, and then the flow about each particle. The results will be compared to two-phase flow visualization results in a boundary layer. The computer program can handle a large number of particles within a turbulent field. The proposed direct numerical simulation may lead to an improved understanding of the two-phase flow microstructure, as well as provide different statistics on two-phase flow useful for the constitutive relationships in the averaged flow equations.