B132 柔軟な弾性表面を持つ円柱に発生する進行波

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It is important to bio-tluidmechanics 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, namely, a continuously occurring wave, a periodically occurring wave and a randomly occurring wave. And the wave occurrence was not related to the cylinder model's diameter. However, the condition of the generation of these wave were related to the cross sectional area ratio and Reynolds number. In the case of the periodical and continuous waves, the frequencies of the waves were 4 to 14 times higher than that of the Karman vortex pair shedding from the rigid cylinder. Moreover dimensionless frequency, normalized by Karman vortex pair shedding frequency, was showed to lie in a curve of the Reynolds number to the 0.67th power. The wave velocities were nearly 70% of the main flow velocities. In addition, the traveling velocities were in a good agreement with the velocities of the separated shear layer around the rigid cylinder. These results indicated that generation of the wave was caused by instability of separated shear flow around the cylinder.
日本流体力学会の論文
2001-07-31

B132 柔軟な弾性表面を持つ円柱に発生する進行波

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