渦法による急発進する二次元矩形柱まわりの過度的流れ解析 : 前面角部切落し効果について(流体工学,流体機械)

概要

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Transient flow around an impulsively started rectangular cylinder with and without cutting its front edges is simulated by a vortex method in order to know the reason why the drag coefficient is reduced by the cut-out of the front edges which was reported in earlier experimental papers by the research group of the present authors. Two approaches are used in the present paper to the vortex method, which is combined with a panel method ; (1) the vortex blob and sheet method and (2) the method using local smoothing interpolation function combined with the vortex sheet method. The comparison of the numerical results of the rectangular cylinder without cutting of its edges between the two approaches shows that the method (2) has more numerical diffusion than the method (1). The numerical results show that the reduction of the drag coefficient due to cutting out of its front edges is simulated by the method (1), comparing with the earlier experimental results, and the strength of the shedding vortices from the front edges becomes less by the cutting out than without the cutting out.
社団法人日本機械学会の論文
2003-01-25