205 乱流境界層の乱流量分布に対する粗さの影響(2)(OS2-2 壁乱流の計測と制御,OS2壁乱流の計測と制御)

概要

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Reynolds shear stress profile has been discussed on roughness effect for the turbulent boundary layer over a rough wall under a zero pressure gradient. The value of Reynolds shear stress normalized with friction velocity is lower than that of smooth wall turbulent boundary layer. The value in the logarithmic layer can be represented with the sum of both the wall shear stress and integral of correlations value between velocities and vorticities fluctuations in the roughness sub-layer by analyzing the x-direction Reynolds equation. From the results of the correlations, it is indicated that the Reynolds shear stress in the logarithmic layer has a lower value than the wall shear stress.
2007-11-17