角柱の挿入により非定常化した平行平板間流れと熱伝達 : 第1報, 数値解析結果の検討およびカルマン渦列の可視化実験

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Two-dimensional numerical computation has been performed for unsteady flow appearing in a channel obstructed by an inserted square rod. The computation was made for several cases of different rod sizes and of different inlet velocity profiles. The rod was located on the center plane of the channel and the flow Reynolds number was kept constant (Re=1000). Two additional cases were also studied. One of them is the case where the channel walls move at a speed of induced channel Reynolds number to be 1,000. Another is the case when the rod was located in a uniform flow. The performed computation and the grid point system used were validated by comparing the Strouhal number calculated for the latter of the additional cases with available experimental data. The present computation made for several cases reveals that the behavior of the vortex street formed downstream of the rod can differ from the counterpart of the vortex street formed by the rod placed in a uniform flow. In the latter case, the vortices shed from the upper half of the rod remain in the upper half of the flow area, and the vortices shed from the lower half remain in the lower half of the flow space. However, in several calculated cases, it was found that the vortices shed from the rod move laterally in a remarkable fashion. The vortices shed from the upper half cross the center plane of the channel as they move downstream, and those from the lower half of the rod move towards the upper half of the flow space. In order to confirm this strange numerical result, flow visualization was also performed for flow in a channel obstructed by a square rod.
一般社団法人日本機械学会の論文
1991-04-25

角柱の挿入により非定常化した平行平板間流れと熱伝達 : 第1報, 数値解析結果の検討およびカルマン渦列の可視化実験

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