摘要
一、前言 当今使用最广的二方程的各向同性的涡粘性湍流模型K-εEVM的致命弱点是不能加入有关湍流结构的方向性特征的边界约束条件,因而不能通用于诸多实际上是非各向同性湍流场的预测。本文将提出一个新的线性非各向同性的涡粘性模型K-εLAEVM。
A new linear anisotropic eddy viscosity model K-e LAEVM has been proposed by assuming universality of local turbulence structure. By invoking experiment determined boundary conditions of directional structure of turbulence ,the anisotropy of stress tensor can be properly predicted with the present model. Three different kinds of flows have been computed to demonstrate how the above boundary conditions should be set at inlet,wall, symmetry and entraining boundaries. Both the reattachment length of the separated flow over a backward-facing step and the spread rate of the round free jet were predicted within experiment accuracy.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
1993年第4期390-393,共4页
Journal of Engineering Thermophysics
