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Numerical Simulation on Laminar-Turbulent Transition of the Channel Flow with Simulated Wall Roughness

  • Kiyoshi Yamamoto
Conference paper
Part of the IUTAM Symposia book series (IUTAM)

Summary

Direct numerical simulation on laminar-turbulent transition of the channel flow is conducted to elucidate the effect of distributed wall roughness on the transition. In the numerical simulation, distributed wall roughness is simulated by a periodic suction/blowing (PSB) acted on the channel wall. It is found from the simulation that the PSB simulates well a kind of two-dimensional distributed wall roughness and can strongly destabilize the channel flow. As a result, it induces the transition of the sub-critical channel flow with its Reynolds number equal to 5000 when it has a large amplitude. On the other hand, it accelerates the transition process of the super-critical channel flow with its Reynolds number equal to 10000. The critical amplitude of the PSB under which it has no effect on the transition is found.

Keywords

channel flow transition wall roughness numerical simulation 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • Kiyoshi Yamamoto
    • 1
  1. 1.National Aerospace LaboratoryChofu, Tokyo 182Japan

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