乱流促進体をもつ二次元チャンネル内の乱流予測に関する研究 : 第3報,Large Eddy Simulationの改善および流脈の形成

概要

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Fully developed incompressible turbulent Flow in two-dimensional channel with turbulence promoters has been predicted numerically by large eddy simulation, Parameter C in Smagorinsky model can be assumed constant generally in the range of high Reynolds. In this paper, C is varied with SGS Reynolds number in low Reynolds number region and SGS eddy diffusivity near the solid boundary is considered as a function of the distance from the boundary, the velocity gradient and the molecular viscosity, There improvements of SGS eddy viscosity model and the boundary condition of SGS eddy diffusivity have little effects on the mean velocity distribution, but have a significant effect on distributions of turbulence and turbulent shear stress. Computed streaklines and Strouhal number of vortex shedding behind the turbulence promoter are compared with visual experiments. The Reynolds number in computation is set at 1.1 × 10^4 and 9000 grid are distributed.
一般社団法人日本機械学会の論文
1985-04-25