角柱後流におけるSGS散逸とGS成分エンストロフィの関係 : LESを用いた数値解析による検討 : 流体工学,流体機械

概要

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Among the various methods of turbulent flow computation, Large Eddy Simulation (LES) with Dynamic Mixed Subgrid-Scale (SGS) model proposed by Vreman et al, in 1994 is expected to be the most effective method to evaluate the inverse transfer of turbulent energy from unresolved small size eddies to resolved large ones (the backscatter). In this paper, we discuss mainly on the results of a numerical analysis for the turbulent flow around a rectangular cylinder in order to show instantaneous turbulent properties. By phase-averaging these properties, the principal features of periodic phenomena can be made clear. Especially we focus on the relation between SGS dissipation and Grid-Scale (GS) enstrophy. As a result, it is shown that the Vorticity model that has been said to have less physical meaning has, however, possibility to be one of a useful SGS models by reason of positive correlation between SGS dissipation and GS enstrophy.
社団法人日本機械学会の論文
2001-04-25