Abstract
Direct numerical simulation has been conducted for turbulent water flow around a waving surface with the separation of skin in order to examine the turbulence modification due to the surface deformation and skin separation. The cluster models of beads, springs and dashpots are used for simulating the tiny piece of skin. An unsteady generalized curvilinear coordinate is used for transforming from waving boundary to flat boundary. The computational results show that the surface waving due to sheer stress is effective for drag reduction. On the other hand, the cluster models separated by high shear are accumulated in the low-speed streak region. These models are found to enhance ejection and sweep nearby.
