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Transition to Turbulence in Wall-Bounded Shear Flows

Transition to Turbulence in Wall-Bounded Shear Flows

Wednesday 15/06/2016
  • Michael Karp
  • Work towards PhD degree under the supervision of Prof. Yaacov Cohen
  • Classroom 165, ground floor, Library, Aerospace Eng.
  • Department of Aerospace Engineering
  • Technion – Israel Institute of Technology
  • The talk will be given in Hebrew

Albeit great advancement, transition to turbulence continues to be an intriguing subject, challenging many researchers worldwide. The current research covers several aspects of transition – The evolution of coherent structures, such as counter-rotating vortex pairs and hairpins, observed in various transitional as well as turbulent flows is studied using a novel analytical-based numerical method for the evolution of localized disturbances in homogenous shear base-flows. A minimal element model capable of following the evolution of packets of hairpins is developed and compared successfully with experiments. Finally, an analytical model for transition via secondary instability of counter-rotating vortices in channel flow is presented. The model utilizes separation of scales between the slowly evolving base-flow and the rapidly evolving secondary disturbance to capture most transition stages using the multiple time scales method and its predictions are verified by comparison with direct numerical simulations.

Light refreshments will be served before the lecture
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