E-113 ランダム粗度上を空間発達する乱流境界層の LES 解析

概要

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For the estimation of urban air quality, it is important to predict turbulent flows over buildings and structures, which are densely arranged in the urban area, and to clarify the dispersion process in the surface layer over very roughened surface. In this paper, it is the objective to determine the characteristics of flow and dispersion which change by arranging scatteringly the roughness blocks after making a spatially developed turbulent boundary layer over rough-wall by using LES technique and the pseudo-periodic boundary conditions. Four LES cases (uniform (staggered) arrays and three random arrays) are carried out to investigate turbulence structures which are affected by the arrangement patterns of roughness blocks, including a densely-scattering pattern like urban area.
日本流体力学会の論文
2003-07-28