Numerical Simulation of Particle and Liquid Contaminant Mixing in Fluid Flows

本文采用数值模拟方法，模拟了两相液体在通道内流动和同心圆柱间环形间隙内固体颗粒的分布。这将是一个直接的数值模拟，不需要建模，使用伪谱代码。流动将是层流的，但有足够的惯性效应，表现出由流动不稳定性驱动的三维涡结构。重点是阐明使颗粒悬浮的机制。边界壁将呈波浪状，具有不同的壁面粗糙度振幅和波长，以便找到最大悬浮和有效输送颗粒的条件。

A numerical simulation is to be carried out which simulates the distribution of solid particulates in the flow of two phase liquids through channels, and in the annular gap between concentric cylinders. This will be a direct numerical simulation, requiring no modeling, using a pseudo-spectral code. The flow will be laminar but have sufficient inertia effects to exhibit three- dimensional vortex structures driven by flow instabilities. The focus is on clarifying the mechanisms which keep particles in suspension. The bounding walls will be wavy, with various amplitudes and wave lengths of the wall roughness, in order to find the conditions for the maximum suspension and efficient transport of the particulates.