矩形柱・隅欠矩形柱・L型断面柱まわりの様々なはく離流れの分類と数値予測 : 一般座標系補間法LESの複雑形状まわりのはく離乱流への適用性

概要

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With an aim to predict the aerodynamic characteristics and'the unsteady behavior of separated flows, around various cylinders with complex geometry, Large Eddy Simulation(LES) using the interpolation method in the generalized coordinate system is conducted at Re=l, 000. Firstly, we examine the computational results for the rectangular cylinders with various side ratios ranging from D/B=2. 0 to 4.0. The typical features of separated shear layer are reproduced and the aerodynamic characteristics are accurately predicted. Secondly, in the case of a rectangular cylinder(D/B=3.0) with corner recession) we discuss how the behavior of the separated shear layer has effect on the aerodynamic characteristics. Thirdly, in the case of a L-shaped cylinder, where the behavior of separated shear layer becomes asymmetrical, we perform a detailed investigation concerning relation between the behavior of separated shear layer and the aerodynamic characteristics. Finally, we clarify the applicability of LES to the complex wake turbulence.
社団法人日本建築学会の論文
2002-10-30