抄録
It is important to understand the interaction between deformable surface of creatures and its surrounding flow field. Therefore, we have carried out this study using various cylinder models with elasto-flexible surface to clarify the interaction. The deformation of the surface and the flow field around the model were observed using a laser light sheet visualization method. The visualization result showed that there were three different kinds of traveling waves generated on the surface of any cylinder models, namely, continuously-occurring wave, periodically-occurring wave, randomly-occurring wave at high-speed stream, Especially, periodically-occurring wave was observed to occur at every Karman vortex shedding from the cylinders. In the case that silicone oil was contained in the surface region, the experimental results indicated that wavelength of the traveling wave was 20% shorter than the case of water contained. The traveling velocities were nearly 75% of the main flow velocities. In the case of the continuously-occurring wave the hydrodynamic drag was 20% lower than that of the rigid cylinder and the cylinder model which its flexible-surface was removed.
