修正内嵌边界法对颗粒运动的直接模拟

DIRECT SIMULATION OF PARTICULATE FLOW USING MODIFIED IMMERSED BOUNDARY METHOD

本文提出了一种基于内嵌边界法(IBM)的思想,在描述颗粒只有较少网格时能较为准确地计算气固多相流的模型。模型依据边界层理论,通过定义颗粒表面的速度分布函数来修正由于计算网格尺度大于边界层厚度所带来的误差。本文通过计算单颗粒绕流和单颗粒沉降的最终沉降速度并与实验进行比较验证了本文模型的准确性。

According to the thoughts of immersed boundary method （IBM）, a new model for simulat- ing gas-solid multiphase flow with few grids to describe particle is presented. From the boundary layer theory, to modify the error that is produced for the calculating grid scale is larger than the boundary- layer thickness, a more physical kind of velocity distributed function near the particle boundary is defined. And numerical simulations of flow around a sphere and a spherical particulate sedimentation were done to prove the validity of this model presented in this paper.