ABSTRAKT

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.