層流境界層流れと垂直に置かれた長方形平板上流の非定常首飾渦挙動

抄録

The behavior of the unsteady necklace vortex formed in front of a rectangular flat plate with an aspect ratio of 2 vertically standing on the flat ground wall on which the laminar boundary layer develops was investigated by using a dynamical visualization and the time series PIV measurement. As a result, it was revealed that the necklace vortex pattern could be classified into five types of 2-, 4- and 6-laminar necklace vortex systems, and two unsteady vortex systems such as oscillation and amalgamation behaviors. The boundary of the necklace vortex patterns depends on Reynolds number and the boundary layer thickness. The turbulent intensity increases rapidly in the amalgamation.