Self-similarity in the outer region of adverse-pressure-gradient turbulent boundary layers

被引：0

作者：

Maciel, Yvan ^{[1
,2
,3
]}

Rossignol, Karl-Stéphane ^{[1
,2
,3
]}

Lemay, Jean ^{[1
,2
,3
]}

机构：

[1] Laval University, Quebec City, Que. G1K 7P4, Canada

[2] Department of Mechanical Engineering

[3] AIAA

来源：

AIAA Journal | 2006年 / 44卷 / 11期

关键词：

This paper presents a consistent theory of self-similarity and of equilibrium in the outer region of turbulent boundary layers that explains recent experimental findings on the subject; including new ones presented here. The theory is first presented in a general form where the outer scales are left unspecified and it is not assumed that the mean velocity defect and the Reynolds stresses share a common velocity scale. It is shown that the main results of the traditional similarity theory remain valid even in this case. Common outer scaling with the Zagarola-Smits length and velocity scales is then chosen. A new pressure gradient parameter is introduced to characterize the local effect of the pressure gradient in all flow conditions including strong adverse-pressure-gradient conditions. By analyzing several adverse-pressure- gradient flow cases; it is shown that self-similarity of the mean velocity defect profile is reached in all cases in localized but significant flow regions. The same is; however; not true of the Reynolds stress profiles. In agreement with the similarity analysis; the self-similar velocity defect profile is found to be a function of the pressure gradient and most flows studied here are only in an approximate state of equilibrium in the region of self-similar defect profiles despite the excellent collapse of the profiles. Copyright © 2006 by the American Institute of Aeronautics and Astronautics; Inc. All rights reserved;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Journal article (JA)

引用

页码：2450 / 2464