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Turbulence intensities in large-eddy simulation of wall-bounded flows

Bae, H. J. and Lozano-Durán, A. and Bose, S. T. and Moin, P. (2018) Turbulence intensities in large-eddy simulation of wall-bounded flows. Physical Review Fluids, 3 (1). Art. No. 014610. ISSN 2469-990X. doi:10.1103/physrevfluids.3.014610.

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A persistent problem in wall-bounded large-eddy simulations (LES) with Dirichlet no-slip boundary conditions is that the near-wall streamwise velocity fluctuations are overpredicted, while those in the wall-normal and spanwise directions are underpredicted. The problem may become particularly pronounced when the near-wall region is underresolved. The prediction of the fluctuations is known to improve for wall-modeled LES, where the no-slip boundary condition at the wall is typically replaced by Neumann and no-transpiration conditions for the wall-parallel and wall-normal velocities, respectively. However, the turbulence intensity peaks are sensitive to the grid resolution and the prediction may degrade when the grid is refined. In the present study, a physical explanation of this phenomena is offered in terms of the behavior of the near-wall streaks. We also show that further improvements are achieved by introducing a Robin (slip) boundary condition with transpiration instead of the Neumann condition. By using a slip condition, the inner energy production peak is damped, and the blocking effect of the wall is relaxed such that the splatting of eddies at the wall is mitigated. As a consequence, the slip boundary condition provides an accurate and consistent prediction of the turbulence intensities regardless of the near-wall resolution.

Item Type:Article
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URLURL TypeDescription
Bae, H. J.0000-0001-6789-6209
Lozano-Durán, A.0000-0001-9306-0261
Moin, P.0000-0002-0491-7065
Additional Information:© 2018 American Physical Society. Received 24 July 2017; published 22 January 2018. This work was supported by NASA under the Transformative Aeronautics Concepts Program (Grant No. UNIX15AU93A).
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Record Number:CaltechAUTHORS:20210315-113239124
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108433
Deposited By: Tony Diaz
Deposited On:19 Mar 2021 01:02
Last Modified:19 Mar 2021 21:41

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