计算物理 ›› 2010, Vol. 27 ›› Issue (4): 518-526.

• 研究论文 • 上一篇    下一篇

各向异性颗粒PDF输运方程及其颗粒湍流扩散

徐江荣1, 张平2, 陈江星1, 丁宁1   

  1. 1. 杭州电子科技大学理学院, 浙江 杭州 310018;
    2. 杭州电子科技大学计算机学院, 浙江 杭州 310018
  • 收稿日期:2009-03-30 修回日期:2009-09-16 出版日期:2010-07-25 发布日期:2010-07-25
  • 作者简介:徐江荣(1966-),male,Zhejiang,professor,PhD,major in two-phase flow model and its numerical simulating.
  • 基金资助:
    Supported by natural science foundation of zhejiang province(No. Y105028)

Turbulent Particle Dispersion Modeling with PDF Equation Based on Langevin Equation of Fluid Velocity

XU Jiangrong1, ZHANG Ping2, CHEN Jiangxing1, DING Ning1   

  1. 1. School of Science, Hangzhou Dianzi University, Hangzhou 310018, China;
    2. School of Computer Science, Hangzhou Dianzi University, Hangzhou 310018, China
  • Received:2009-03-30 Revised:2009-09-16 Online:2010-07-25 Published:2010-07-25

摘要: 根据Minier的模型,获得颗粒所见流体脉动速度的朗之万模型,并推导颗粒所见流体湍流脉动速度自关联函数,该函数具有各向异性的特征,进一步由流体脉动速度朗之万模型和颗粒运动方程获得相应的颗粒PDF输运方程.为描述在网格生成湍流中的颗粒扩散运动,将颗粒PDF输运方程作相应的简化,获得一个具有颗粒湍流各向异性的解析解,将方程的解与Wellsand Stock的颗粒湍流扩散实验结果进行比较,获得了很好的结果.揭示了具有各向异性特征的颗粒PDF输运方程的优越性.

关键词: 两相流, PDF输运方程, 湍流朗之万模型, 解析解

Abstract: A Langevin equation of fluctuating velocity of fluid ‘seen’ by particle is simplified in Minier's model.Autocorrelation of turbulence fluctuating velocity is obtained,which has non-isotropic property.Corresponding PDF model of particle is obtained and a simplified form is used to predict turbulent particle dispersion in grid-generating turbulence flow.PDF model is solved analytically and solutions are compared with experimental results of Wells and Stock.

Key words: two-phase model, PDF transport equation, Langevin model, analytic solution

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