DNS and scaling law analysis of compressible turbulent channel flow

被引：0

作者：

李新亮

马延文

傅德薰

机构：

来源：

Science China Mathematics | 2001年 / 05期

基金：

中国国家自然科学基金;

关键词：

compressible turbulent flow; direct numerical simulation; high-order statistics; scaling law; streaks;

D O I：

暂无

中图分类号：

O354 [气体动力学（可压缩流体力学）];

学科分类号：

080103 ; 080704 ;

摘要：

Fully developed compressible turbulent channel flow (Ma = 0.8, Re = 3300) is numerically simulated, and the data base of turbulence is established. The statistics such as density-weighted mean velocity and RMS velocity fluctuations in semi-local coordinates agree well with those from other DNS data. High order statistics (skewness and flatness factors) of velocity fluctuations of compressible turbulence are reported for the first time. Compressibility effects are also discussed. Pressure-dilatation absorbs part of the kinetic energy and makes the streaks of compressible channel flow more smooth. The scaling laws of compressible channel flow are also discussed. The conclusions are: (a) Scaling law is found in the center area of the channel, (b) In this area, ESS is also found, (c) When Mach number is not very high, compressibility has little effect on scaling exponents.

引用

页码：645 / 654

页数：10