Abo Bibliothek: Guest
Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

Wall scaling laws for high-Reynolds-number turbulent pipe flow at Reτ = 3008

pages 625-630
DOI: 10.1615/TSFP9.1050
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ABSTRAKT

A direct numerical simulation of turbulent pipe flow is performed at Reτ = 3008 with a long streamwise domain length (30R) to investigate wall scaling laws in the physical and wavenumber spaces. The power law follows the streamwise mean velocity in the overlap region, y+ = 90 − 300, evaluated by the power law indicator function. The scale-separated Reynolds shear stress shows that the largescale motions (λx+ > 3000) are more responsible to construct the constant-stress layer than the small-scale motions (λx+ < 3000), and thus it is proposed that the large-scale motions more contribute to the growth of the mean velocity in the overlap region than the small-scale motions. In the premultiplied energy spectra of the streamwise velocity fluctuations, the kx−1 region ssociates with the attached eddies appeared in λx/R = 2 − 5 at y+ = 90 − 300 with the bimodal distribution. Linear growth of small-scale energies to large-scale energies helps to appear the kx−1 region at high Reynolds number.

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