E243 空間発達型粗面乱流境界層のLES(E-24 地球シミュレータを用いた乱流の大規模計算(2),一般講演)

概要

論文の詳細を見る
The effect of changing width and its mean separation distance of roughness elements on the flow characteristics of turbulent boundary layers is studied numerically using the method proposed by Nozawa and Tamura which simulate a spatially developing rough-wall turbulent boundary flow. To progress the understanding of the roughness behavior over rough-walls, the mean and fluctuating velocities and the length scale of rough-wall turbulent boundary layers were studied by changing the width and its mean separation distance of the uniformly distributed roughness. Furthermore, the flow over the roughness with its height set randomly was compared to that of the uniformly distributed roughness. In present results, the turbulence structures of rough-wall boundary layers have a dependence on mean element separation distance, D and the uniformity of the roughness even though the roughness density and the average height identical.
2004-08-09