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TURBULENCE CONTROL BY COMPLIANT SKIN AND STRATA-CORNEAS DESQUAMATION OF A SWIMMING DOLPHIN

Hiroshi Nagamine
Department of Mechanical and System Engineering Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan

Atsusi Taki
Department of Mechanical and System Engineering Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan

Tohru Murata
Department of Mechanical and System Engineering Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan

Yoshimichi Hagiwara
Department of Mechanical and System Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Ryoichi Matsubara
Echizen-Matsushima Aquarium Mikuni-cho, Sakai-gun, Fukui-ken 913-0065, Japan

Resumo

Direct numerical simulation and experiment have been conducted for turbulent water flow near the compliant surface with the separation of pieces of the surface with time in order to examine how the turbulence control and drag reduction are performed by swimming dolphins. The surface is covered with many cluster models of beads and springs as representative of the strata corneas. The computational results show that the compliant surface contributes to the drag reduction. The separation of small pieces of the surface with time increases the Reynolds stress on average, which is verified by the experimental result. When the separation rate is high, however, the separation modifies near-wall turbulence and decreases the shear stress.