不同相空间维数下的两相湍流PDF模型  

Two-Phase Flow PDF Models in Different Dimension of the State Vector

作　　者：王华昌[1] 徐江荣[1] 

机构地区：[1]杭州电子科技大学应用数学与工程计算研究所,浙江杭州310018

出　　处：《杭州电子科技大学学报（自然科学版）》2006年第3期95-98,共4页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：浙江省自然科学基金项目(Y105028)

摘　　要：该文使用统计物理学中概率流体理论来考察现有两相湍流PDF模型,发现各种PDF模型仅是概率流体相空间降维过程中的不同阶段的PDF输运方程。通过降维过程的演化,指出了推导两相湍流两阶矩模型时存在两种不同的封闭问题:降维封闭和高阶矩封闭,指出了降维封闭与流体颗粒运动方程无关,并描述了现有的封闭方法。Two- phase flow PDF models are discussed using statistical physics theory; the different PDF models can be regarded as different PDF transport equations of different dimension of the state vector. By reducing the dimension of the state vector, it is shown that there are two closure problems in second- order moment model of two - phase flow have： closure of the dimension reducing of the state vector and closure of higher- order moment, and that closure of the dimension reducing of the state vector is not related to particle lagavin equations. The different closure methods are discussed too.

关 键 词：湍流 两相流 概率密度函数 随机过程 

分 类 号：O357.5[理学—流体力学]