辺長比の小さい角柱の空気力特性に関するLES解析 : 接近流の乱れの影響について

概要

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It is well known the drag coefficients of a rectangular cylinder normal to a uniform stream show a maximum value as high as 2.8 when the side ratio D/B [depth (D) to breadth (B) ratio] is eaual to about 0.6. Its rectangular geometry is called the critical section. In the case of oncoming turbulent flow, the critical section is shifted to a side ratio of about 0.5. However any CFD researches have not succeeded thus far in obtaining the above aerodynamic phenomena around the critical section. This paper tries to reproduce the very sharp peak of drag coefficient at side ratio equal to 0.6 in uniform flow and also the peak of drag coefficient at side ratio eaual to 0.5 in turbulent flow by using LES (Large Eddy Simulation) method. Also, focusing on turbulence effects on aerodynamic characteristics of a rectangular cylinder with small side ratio, their physical mechanism is discussed. Especially switching phenomena, which represent two types of flow patterns in low or high pressure mode below the critical section, are investigated.
社団法人日本建築学会の論文
2004-07-30