S0504-6-1 粗面乱流境界層の仮想壁面高さに対する粗さの効果(噴流,後流および剥離流れの流動解析と応用(その6))

概要

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LDV Measurement has been performed for the turbulent boundary layer evolving over the rough wall, which the roughness height is proportional to streamwise distance. Mean velocity and turbulence were measured at x≒2180 mm . The Reynolds numbers based on momentum thickness and roughness height were 6000 and 150 respectively. The moment centroid of the drag acting on the rough wall is represented as the sum of the integral of the mean flow momentum, Reynolds shear stress and viscous stress in a cavity region between the roughness elements. The integral of the Reynolds shear stress mostly contributes to the moment centroid. Using the analytical solution of the mean velocity, the moment centroid height can be formulated with the roughness density.
社団法人日本機械学会の論文
2009-09-12