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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

Inner-scaled turbulent statistics of turbulent pipe flows

pages 1-6
DOI: 10.1615/TSFP8.670
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Краткое описание

Direct numerical simulations (DNSs) of fully developed turbulent pipe flows for Reτ=180, 544, and 934 were performed to investigate the inner-scaled turbulent statistics associated with spatial amplitude modulation (AM). A long streamwise domain length, 30R, was adopted to avoid the domain length effect, which affects on the convergence of turbulence statistics. The present result shows that the near-wall peak in the streamwise turbulence intensity increases with increasing the Reynolds number. This trend is very consistent to turbulent boundary layer (TBL) and channel flows, indicating that there is a universal flow behavior in turbulent canonical flows. Evidence to support this finding is found in pre-multiplied energy spectra and two-point AM covariance. It is determined that both the long wavelength energy near the wall and the non-linear effects of AM contribute to the growth of the near-wall peak in the streamwise turbulence intensity.

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