Доступ предоставлен для: Guest
Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

A NUMERICAL AND EXPERIMENTAL STUDY OF TURBULENT BOUNDARY LAYER WITH ROD-ROUGHENED WALL

pages 163-168
DOI: 10.1615/TSFP5.240
Get accessGet access

Краткое описание

The effects of surface roughness on a turbulent boundary layer (TBL) were investigated using direct numerical simulations (DNS) and particle image velocimetry (PIV). The roughness elements used were periodically arranged two-dimensional spanwise rods, and the roughness height was k/δ=0.05 for DNS and k/δ=0.0165, 0.032 for PIV. In PIV measurements, the friction velocity uτ for smooth and rough walls was estimated by fitting of mean velocity profile. Introduction of the roughness elements increased the wake strength and the turbulent stress not only in the roughness sublayer but also in the outer layer. This indicates the existence of interaction between inner and outer layers. Iso-contours of mean velocities and Reynolds stresses in the roughness sublayer obtained by PIV measurements show a good agreement with DNS results.

Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции Цены и условия подписки Begell House Контакты Language English 中文 Русский Português German French Spain