English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Large-eddy simulation study of the logarithmic law for second- and higher-order moments in turbulent wall-bounded flow

Stevens, R. J. A. M., Wilczek, M., & Meneveau, C. (2014). Large-eddy simulation study of the logarithmic law for second- and higher-order moments in turbulent wall-bounded flow. Journal of Fluid Mechanics, 757, 888-907. doi:10.1017/jfm.2014.510.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Stevens, Richard J. A. M., Author
Wilczek, Michael1, Author           
Meneveau, Charles, Author
Affiliations:
1Max Planck Research Group Theory of Turbulent Flows, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2266693              

Content

show
hide
Free keywords: -
 Abstract: The logarithmic law for the mean velocity in turbulent boundary layers has long provided a valuable and robust reference for comparison with theories, models and large-eddy simulations (LES) of wall-bounded turbulence. More recently, analysis of high-Reynolds-number experimental boundary-layer data has shown that also the variance and higher-order moments of the streamwise velocity fluctuations u'(+) display logarithmic laws. Such experimental observations motivate the question whether LES can accurately reproduce the variance and the higher-order moments, in particular their logarithmic dependency on distance to the wall. In this study we perform LES of very high-Reynolds-number wall-modelled channel flow and focus on profiles of variance and higher-order moments of the streamwise velocity fluctuations. In agreement with the experimental data, we observe an approximately logarithmic law for the variance in the LES, with a `Townsend-Perry' constant of A(1) approximate to 1.25. The LES also yields approximate logarithmic laws for the higher-order moments of the streamwise velocity. Good agreement is found between A(p), the generalized `Townsend-Perry' constants for moments of order 2p, from experiments and simulations. Both are indicative of sub-Gaussian behaviour of the streamwise velocity fluctuations. The near-wall behaviour of the variance, the ranges of validity of the logarithmic law and in particular possible dependencies on characteristic length scales such as the roughness length z(0), the LES grid scale Delta, and subgrid scale mixing length C-s Delta are examined. We also present LES results on moments of spanwise and wall-normal fluctuations of velocity.

Details

show
hide
Language(s): eng - English
 Dates: 2014-09-292014-10-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1017/jfm.2014.510
BibTex Citekey: ISI:000343757200033
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Fluid Mechanics
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Cambridge [etc.] : Cambridge University Press [etc.]
Pages: - Volume / Issue: 757 Sequence Number: - Start / End Page: 888 - 907 Identifier: ISSN: 0022-1120
CoNE: https://pure.mpg.de/cone/journals/resource/954925340716