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On the mechanism of turbulence suppression by spanwise surface oscillations

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Abstract

The attenuation of turbulent pulsations in near-wall flows by means of spanwise periodic surface oscillation is examined. A direct numerical simulation of the flow in a circular pipe with imposed rotational oscillations has shown that for Re=4000 and the optimal oscillation frequency, the degree of turbulence attenuation increases with increase in the oscillation amplitude until the flow relaminarizes. The estimated optimal frequency ω+=0.06. The results of applying the theory of the development of near-wall coherent structures agree qualitatively with those of numerical simulation. It is concluded that the intensity of the pulsations is reduced because the spanwise movements weaken the longitudinal vortices which cause turbulent bursts in near-wall flows.

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Authors
  1. N. V. Nikitin
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Additional information

Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 2, pp. 37–44, March–April, 2000.

The research was carried out with financial support from the Russian Foundation for Basic Research (project No. 99-01-01095).

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Nikitin, N.V. On the mechanism of turbulence suppression by spanwise surface oscillations. Fluid Dyn 35, 185–190 (2000). https://doi.org/10.1007/BF02831425

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  • DOI: https://doi.org/10.1007/BF02831425

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