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DNS of an Oscillating Shear Layer Between Two Parallel Couette Flows

Part of the Lecture Notes in Mechanical Engineering book series (LNME)


A non-planar mixing layer observed between parallel Couette flows by Narasimhamurthy et al. (Phys Rev E 85:036,302, 2012) is considered. Direct numerical simulation is chosen, and simulations are run in order to determine the critical Reynolds number at which the interface between the co-flowing laminar and non-laminar flow becomes unstable exhibiting a meandering motion. The necessary conditions required to trigger the shear-layer instability were also discussed. Different combinations of Reynolds numbers are chosen keeping the Reynolds number ratio between the laminar and non-laminar flows as constant. Preliminary results indicate that the onset of instability occurs, and a meandering motion is observed at the interface when Reynolds number for the non-laminar flow corresponds to 650.


  • Direct numerical simulation
  • Turbulent non-turbulent interface
  • Instability
  • Meandering motion

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The first author would like to thank Shashi Kumar J and Karthikeyan J (CFTC lab, IIT Madras) for taking their valuable time in helping and teaching necessary concepts and techniques during all stages of learning process for the work. We thank P.G. Senapathy Center for Computing Resource, IIT Madras, for the grant of computing time.

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Correspondence to Vagesh D. Narasimhamurthy .

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Manohar Teja, K., Narasimhamurthy, V.D. (2021). DNS of an Oscillating Shear Layer Between Two Parallel Couette Flows. In: Venkatakrishnan, L., Majumdar, S., Subramanian, G., Bhat, G.S., Dasgupta, R., Arakeri, J. (eds) Proceedings of 16th Asian Congress of Fluid Mechanics. Lecture Notes in Mechanical Engineering. Springer, Singapore.

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  • Print ISBN: 978-981-15-5182-6

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