柔軟な弾性表面を持つ円柱に発生する進行波 : 流体工学, 流体機械

概要

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It is important to bio-fluidmechanics to understand the interaction among deformable surface, its surrounding flow field and hydrodynamical forces. In order to clarify this interaction, we have been using 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 the flow field around it. The experimental result showed that there were three different kinds of traveling wave generated on the surface, namely, a continuously-occurring wave, a periodically-occurring wave and a randomly occurring wave. 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. Their wavelengths were about 1/8 compared with the theoretical wavelength of the Karman vortex street behind the rigid cylinder. It is 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 flow separation from the surface and by the generation and moement of the small vortex were responsible for the apperarance and the propagation of the transient wave.
一般社団法人日本機械学会の論文
2001-01-25