Roughness effects in turbulent channel flow

被引：16

作者：

Ashrafian, A

Andersson, HI ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, N-7491 Trondheim, Norway

[2] SINTEF Mat & Chem, Dept Proc Technol, N-7465 Trondheim, Norway

来源：

PROGRESS IN COMPUTATIONAL FLUID DYNAMICS | 2006年 / 6卷 / 1-3期

关键词：

surface roughness; transverse ribs; DNS; turbulence; channel flow;

D O I：

10.1504/PCFD.2006.009478

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

DNS Of turbulent channel flow at Re-tau = 400 is performed. Both walls are roughened by square rods. The height of the roughncss elements is smaller by a factor of 3 than in all earlier computer simulations. The turbulent flow is in the upper end of the transitional regime, where viscous drag is negligible. Substantial changes ill all turbulence statistics are only seen within the toughness sublayer, where detailed information is provided. Hence, smooth-wall scaling applies in the outer layer. The anomalous turbulence features observed in the near-wall region are due to the blocking effect of the roughness elements and the intense shear layers emanating from the rods.

引用

页码：1 / 20

页数：20

共 48 条

[1] Direct numerical simulation of a fully developed turbulent channel flow with respect to the Reynolds number dependence [J].