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

Turbulence Quantities of a Turbulent Boundary Layer over a d-type Rough Surface

Creators Kageyama Yoshiro

Creators Osaka Hideo

Creators Nishino Toshiaki

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.

[ISSN]0372-7661

[NCID]AN00244228