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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

RESPONSES OF LOW- AND HIGH-SPEED STREAKS TO INJECTION OR SUCTION IN A MINIMAL FLOW UNIT

Hideo Yoshida
Dept. of Aeronautics and Astronautics, Kyoto University, Japan

Kenichi Kobayashi
Meiji University, Higashimita 1-1-1, Tama-ku, Kawasaki 214-8571, Japan

Sigeru Tada
Department of Mechanical Engineering, Tokyo Institute of Technology Meguro-ku, Tokyo 152-8552, Japan

Kazuhiro Higuchi
Department of Mechanical Engineering, Tokyo Institute of Technology Meguro-ku, Tokyo 152-8552, Japan

Takashi Nozaki
Department of Mechanical Engineering, Tokyo Institute of Technology Meguro-ku, Tokyo 152-8552, Japan

Ryozo Echigo
Department of Mechanical Engineering, Shibaura Institute of Technology, Minato-ku, Tokyo 108-0023, Japan

Abstract

Direct numerical simulations with external perturbations have been performed in order to clarify the dynamics of the turbulent coherent structure near a wall, and also the possibility of active control of turbulence. To extract the elementary processes of turbulence, the domain of the numerical calculation is a minimal flow unit with a Reynolds number of 1730. A series of flow injections or suctions with Gaussian distribution are administered on both the lower and upper wall surfaces so that they interact with the coherent structure, especially, the high- and low-speed streaks along the flow direction. The various responses of the streaks to the injection or suction are systematically examined. The observed transient behavior, for example, growth or decay of the coherent structures, affords fundamental knowledge for turbulence control in the future.