大気乱流境界層の実験的シミュレーション(流体工学,流体機械)

概要

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Atmospheric boundary layers were simulated in a laboratory wind tunnel by regulating parameters of a turbulence shear flow generator. The generator could control turbulence characteristics ; mean velocity U=0〜8 m/s, turbulence intensity u'/U_∞=1〜13% and integral scale L_ux=0.02〜1.9 m. The maximum turbulence Reynolds number reached about 650 at U_∞=8 m/s and the spectrum had a wide inertial subrange comparable to those in natural atmospheric boundary layers. When the turbulent boundary layers with δ〜0.4 m were realized on a smooth surface, they maintained the power law profile of U〜Y^1/7 until downstream region. On a rough wall, the velocity profiles changed into U〜Y^1/3 and vertical distributions of u', v' and -uV^^^- gave fairly good approximation to the actual conditions of surface boundary layers. Flow visualization around an architecture suggested that precise simulation of turbulence phenomena in atmospheric boundary laers required experimental turbulence fields afforded by large scale turbulence characteristics comparatively sufficing actual wind conditions on the ground.
社団法人日本機械学会の論文
2002-01-25