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EFFECTS OF SPANWISE ROTATION ON THE STRUCTURE OF TURBULENT STRIPE IN PLANE POISEUILLE FLOW

Takahiro Ishida
Department of Mechanical Engineering, Tokyo University of Science Yamazaki 2641 Noda, Chiba 278-8510, Japan

Takahiro Tsukahara
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510, Japan; Research Institute for Science and Technology, Tokyo University of Science, Noda-shi, Chiba 278-8510, Japan

Yasuo Kawaguchi
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan

Résumé

In the transitional channel flow, the large-scale intermittent structure of localized turbulence which is called turbulent stripe, can be found in the form of stripe arrangement. The structure of turbulent stripe is oblique laminar-turbulent banded pattern. We performed the direct numerical simulation at the transitional Reynolds numbers and very low-rotation numbers, and focused on the turbulent stripe in the plane Poiseuille flow subjected to spanwise system rotation. We captured the turbulent stripe in rotating channel flow and found the augmentation and diminution of the turbulent stripe affected by the spanwise rotation. The contents of the discussion are the spatial size of turbulent stripe on the basis of the instantaneous flow fields, the energy spectra, and the spanwise velocity component that characterizes the turbulent stripe. It shoud be noted that the turbulent stripe is enhanced due to the Coriolis instability and the spanwise velocity component increases, while the quasi-laminar region is wider at very low-rotation number.