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Maciel, Yvan

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Maciel

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Yvan

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Université Laval. Département de génie mécanique

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ncf11860329

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  • PublicationRestreint
    Secondary flow and roll cells interaction in high-aspect-ratio rotating turbulent duct flows
    (Gordon and Breach Publishing Group, 2008-04-02) Julien, Steve; Dumas, Guy; Torriano, Federico; Maciel, Yvan
    End-wall effects for high aspect ratio (AR) turbulent duct flows under moderate spanwise rotation are investigated using Reynolds-Averaged Navier–Stokes (RANS) calculations with a Reynolds stress turbulence closure model. It is shown that despite an important uniformisation of the mean streamwise flow compared to the non-rotating case, the channel flow solution (AR ¼ 1) is not recovered in practical high AR ducts used in experiments. The unavoidable end-wall generated secondary flow causes transverse advection which is capable of altering the mean velocity profile, even for AR as high as 22. In addition, for Re ¼ 40,000 and Ro ¼ 0.22, persistent longitudinal roll cells are found in the RANS solutions. The results suggest that their interaction with the secondary flow may challenge the prospect of formally reaching a steady, streamwise invariant regime in actual rotating duct experiments.