B131 一様水流中の柔軟弾性表面を持つ円柱表面に発生する進行波と周りの流れ場

概要

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It is important to bio-fluidmechanics to study the interaction among deformable surface, its surrounding flow field and hydrodynamical forces. In order to clarify this interaction, we have been using various cylinder models having an elasto-flexible surface in uniform water flow. The laser light sheet method was used to visualize the deformation of the surface and flow field around it. The experimental result showed that there were three different kinds of traveling waves generated on the surface. In the case of the periodical and continuous waves, the frequencies of the waves were 6 to 9 times higher than that of the Karman vortex pair shedding from the rigid cylinder. It was indicated that generation of the wave was not caused by large pressure variation from the vortex shedding. The visualization results suggest that local pressure decrease by flow separation from the surface and by the generation and movement of the small vortex were responsible for the appearance and the propagation the transient wave. Moreover the wave velocities were nearly 75% of the main flow velocities. As a consequence, it is considered that the thrust was not caused by the wave. However, in the case of the continuous wave, the time-averaged hydrodynamical drag was about 20% lower than that of rigid cylinder.
日本流体力学会の論文
2000-07-25