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Relaminarisation mechanism of the turbulent Couette flows at high Reynolds numbers under a stable system rotation

DOI: 10.1615/ICHMT.2015.THMT-15.680
pages 351-354

Koji Fukudome
Department of Mechanical Engineering, Ritsumeikan University, Noji-higashi 1-1-1, Kusatsu-shi, Shiga, Japan

Yoshifumi Ogami
Department of Mechanical Engineering Ritsumeikan University 1-1-l Nojihigashi, Kusatsu, Shiga, 525-8577 Japan


Direct numerical simulation was performed to study the turbulent structure of Couette flow at high Reynolds numbers under a stable system rotation. To compare the flow structure, the same friction Reynolds number flow without a rotation is also calculated. A stable system rotation makes the flow relaminarising, and turbulent stripes are observed near the walls. These stripes move independently of each other and are separated by homogeneous turbulence at the channel centre. Turbulent energy is strongly produced and dissipated in the homogeneous turbulence away from the wall; therefore, an improvement in heat transfer could be realised.

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