论文标题
动荡的喷气机：DNS研究
Turbulent Jet: A DNS Study
论文作者
论文摘要
数十年来，环境流体夹带到湍流的剪切流中一直是一个广泛兴趣的话题。为了估计环境流体夹带到湍流射流中，必须定义射流的边界。出现了问题，即确定湍流射流边缘的适当标准是什么。从当前的DNS模拟中，我们观察到需要定义湍流射流的两个边界，即在此称为“外界”，旋转/无旋转（R/IR）界面和湍流/非扰动（T/NT）界面为“内部边界”。本文的主要目的是确定定义喷气机两个边界的必要性。我们还对喷气流量进行了一些有趣的观察，基本上是关于自我相似性和自我保护的。
The entrainment of ambient fluid into a turbulent shear flow has been a topic of wide interest for several decades. To estimate the entrainment of ambient fluid into turbulent jet, it is essential to define the boundary of the jet. The question arises as to what should be the appropriate criterion to determine the edge of the turbulent jet. From the present DNS simulations, we observe that there is a need to define two boundaries for the turbulent jet, namely, the Rotational/Irrotational (R/IR) interface termed here as "Outer boundary" and the Turbulent/Non-Turbulent (T/NT) interface as "Inner boundary". The main aim of the present paper is to identify the need for defining the two boundaries for the jet. We also present some interesting observations of the jet flow, essentially on self similarity and self preservation.
