Memoirs of the Faculty of Engineering, Yamaguchi University
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Memoirs of the Faculty of Engineering, Yamaguchi University Volume 33 Issue 1
published_at 1982
Turbulence Quantities of a Turbulent Boundary Layer over a d-type Rough Surface
d 型粗面乱流境界層の乱流特性
Kageyama Yoshiro
Osaka Hideo
Nishino Toshiaki
About This Article
Descriptions
Turbulent quantities of a fully developed turbulent boundary layer over a d-type rough surface with a zero pressure gradient are described. This surface roughness is characterized by regular two-dimensional elements of square cross section placed one element width apart, with the cavity flow between elements. All measurements have been made under a constant unit Reynolds number U_1/υ=1×(10)^6m^<-1>. Mean velocity, turbulent intensity, Reynolds shear stress, correlation and spectral density are measured and a balance of the momentum equation and the mean flow-and turbulent-kinetic energy equations is estimated. The results are compared with those obtained over a smooth surface and over the k-type surface roughness.
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