Re=1,000のオーダーの断面辺長比の小さな矩形柱の空力および流れの特性に関するLES研究 : 流体計算と風洞実験の相補的技術の確立をめざして

概要

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With an aim to predict on the aerodynamic characteristics and the unsteady behavior of separated flows around the rectangular cylinders with small side ratio at Re≒order of 1,000,the experiments in wind tunnel and Large Eddy Simulation(LES) are conducted. We try to establish the complementary technique between numerical simulation and wind tunnel test. Firstly, it is shown that the present experiments in wind tunnel at 3,000<Re<10,000 are valid about the aerodynamic characteristics, compared with the past experiments. Also, the characteristics of flow patterns are investigated with the use of the frequency distributions, which is calculated from the time history of the drag coefficient. Secondly, we discuss on the associations of aerodynamic characteristics between the computations and the experiments, and clarify the problems with our computations on the flows with irregularity and unsteadiness. Also, the characteristics of flow patterns are comprehended on the basis of the frequency distributions of the computations and the experiments. Further, we reproduce two flow patterns of the low and high pressure mode and perform a detailed investigation of the relation between the separated shear layer and Karman vortices.
社団法人日本建築学会の論文
2002-08-30