两相湍流统一色噪声法概率密度函数模型  

A two-phase turbulence probability density function model in unified colored-noise approximation

作　　者：王路[1] 徐江荣[1,2] 

机构地区：[1]南京理工大学能源与动力工程学院,南京210094 [2]杭州电子科技大学能源研究所,杭州310018

出　　处：《物理学报》2015年第5期290-295,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51176044);浙江省自然科学基金(批准号:Y1110620)资助的课题~~

摘　　要：统一色噪声近似方法对简单一维色噪声问题研究较为充分,本文将统一色噪声法应用到高度复杂的多维气固两相湍流系统之中.首先从颗粒运动Langevin方程出发,利用统一色噪声法获得两相湍流Fokker-Planck方程,然后以此为基础建立颗粒轨道两阶矩模型.文中建立的新模型成功应用于后台阶两相湍流流场的数值模拟,预报合理正确.研究表明,对于多维两相湍流系统,统一色噪声法仍然行之有效.A unified colored-noise approximation （UCNA） method has been widely used to solve the simple one-dimensional problem, and this paper attempts to extend this method to multi-dimensional systems. Firstly, a Fokker-Planck equation is obtained by UCNA method based on the Langevin equation for particle motion, then a two-order moment trajectory model is established on this basis. The new model can be successfully used to predict the backward-facing step two-phase flow, and the simulation results agree well with the measurements. This study shows that the UCNA method is still effective in dealing with multi-dimensional two-phase turbulent systems.

关 键 词：统一色噪声近似 概率密度函数模型 两阶矩模型 数值模拟 

分 类 号：O357.5[理学—流体力学]