Abstract
We introduce a spectral-dynamic model, which is based on Kraichnan’s spectral eddy-viscosity (Kraichnan, 1976) with an arbitrary spectral exponent m for the kinetic-energy spectrum at the cutoff. This model is validated for LES of a turbulent channel flow at low and high Reynolds numbers. Afterwards we look at the influence of a rotation Ω of spanwise axis at a high rotation rate. We find that the following results, concerning the anticyclonic side of the channel and compared with the non-rotating case : a) the low-and high-speed streaks are reduced ; b) the longitudinal vorticity is increased ; c) the mean velocity profile is linear and equal to 2Ω; d) the organized vortices are more coherent, and preferentially inclined at 25° (instead of 45°) to the wall.
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© 1997 Springer Science+Business Media Dordrecht
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Lamballais, E., Métais, O., Lesieur, M. (1997). Influence of a Spanwise Rotation Upon the Coherent-Structure Dynamics in a Turbulent Channel Flow. In: Chollet, JP., Voke, P.R., Kleiser, L. (eds) Direct and Large-Eddy Simulation II. ERCOFTAC Series, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5624-0_21
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DOI: https://doi.org/10.1007/978-94-011-5624-0_21
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