计算物理 ›› 2000, Vol. 17 ›› Issue (6): 633-640.

• 论文 • 上一篇    下一篇

基于拉氏概率密度的两相湍流二阶矩模型

徐一, 周力行   

  1. 清华大学工程力学系, 北京 100084
  • 收稿日期:1998-10-08 修回日期:1999-04-20 出版日期:2000-11-25 发布日期:2000-11-25
  • 作者简介:徐一(1974~),男,江西九江,博士生,从事气固两相流方面的研究,美国伊里诺大学.

A SECOND-ORDER MOMENT TWO-PHASE TURBULENCE MODEL BASED ON THE LAGRANGIAN PDF

XU Yi, ZHOU Li-xing   

  1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, P R China
  • Received:1998-10-08 Revised:1999-04-20 Online:2000-11-25 Published:2000-11-25

摘要: 用颗粒运动的拉氏分析和PDF方法,改进了颗粒相的二阶矩模型。由拉氏两相运动的随机微分方程出发,采用随机过程分析和信号分析法得到湍流两相流动的PDF输运方程,双流体模型方程和两相脉动速度相关的基本模式的封闭式,和用其它方法导出的方程与封闭式的结果一致,对封闭式作了重要的改进,在分析颗粒轨道上的流体湍流作用时间时,全面地引入拉氏分析的轨道穿越效应、惯性效应、连续效应和湍流的各向异性。

关键词: 湍流气粒两相流动, 颗粒相概率密度输运方程, 两相湍流模型

Abstract: Using the Lagrangian analysis of particle motion and PDF(Probability Density Distribution Function) method,an improved the second-order-moment model of particle-phase is proposed.Based on the Lagrangian stochastic two-phase motion equations, using the stochastic-process analysis and the signal-system analysis, the obtained particle-phase PDF transport equation,the two-fluid model equations and the basic version of two-phase fluctuation velocity correlation are in agreement with those obtained by other investigators.However,significant improvement is made for the closure model.The crossing-trajectory effect,continuity effect,inertia effect and the anisotropic turbulence have been taken into account to simulate the interaction time between the particle and the fluid turbulence seen by the particles.

Key words: two-phae turbulent flow, particle-phase PDF transport equation, two-phase turbulence model

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