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Wall turbulence at high friction Reynolds numbers
Phys. Rev. Fluids 7, 014602 – Published 10 January, 2022
DOI: https://doi.org/10.1103/PhysRevFluids.7.014602
Abstract
A new direct numerical simulation of a Poiseuille channel flow has been conducted for a friction Reynolds number of , using the pseudospectral code LISO. The mean streamwise velocity presents a long logarithmic layer, extending from 400 to 2500 wall units, longer than it was thought. The maximum of the intensity of the streamwise velocity increases with the Reynolds number, as expected. Also, the elusive second maximum of this intensity has not appeared yet. In case it exists, its location will be around , for a friction Reynolds number extrapolated to approximately 13 500. The small differences in the near-wall gradient of this intensity for several Reynolds numbers are related to the scaling failure of the dissipation, confirming this hypothesis. The scaling of the turbulent budgets in the center of the channel is almost perfect above 1000 wall units. Finally, the peak of the pressure intensity grows with the Reynolds number and does not scale in wall units. If the pressure at the wall is modeled as an inverse quadratic power of , then at the limit of infinite Reynolds number.
Physics Subject Headings (PhySH)
See Also
Turbulence Statistics of Arbitrary Moments of Wall-Bounded Shear Flows: A Symmetry Approach
Article Text
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