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Transition in Rough Channels

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IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls

Part of the book series: IUTAM Bookseries ((IUTAMBOOK,volume 22))

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Abstract

In this paper DNS of turbulent rough channels has been used to show that \(\tilde{u}_{2} \) ′ | w (the normal Reynolds stress at the top of the roughness elements) is a useful quantity for detection of the transition from laminar to turbulent flow. In addition, \(\tilde{u}_{2} \) ′ | w is linked to the roughness function, allowing for the derivation of a simple expression for the velocity profile in the log region. From this equation a new Moody diagram has been created, which may be used for the prediction of rough flows at high Reynolds numbers.

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References

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Author information

Authors and Affiliations

  1. Dipartimento di Meccanica e Aeronautica, Universita’ di Roma “La Sapienza”, Roma, Italy

    Paolo Orlandi

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  1. Paolo Orlandi
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Correspondence to Paolo Orlandi .

Editor information

Editors and Affiliations

  1. Dept. Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, United Kingdom

    T. B. Nickels

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Orlandi, P. (2010). Transition in Rough Channels. In: Nickels, T. (eds) IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls. IUTAM Bookseries, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9631-9_15

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  • DOI: https://doi.org/10.1007/978-90-481-9631-9_15

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  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-9630-2

  • Online ISBN: 978-90-481-9631-9

  • eBook Packages: EngineeringEngineering (R0)

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