Effect of artificial length scales in large eddy simulation of a neutral atmospheric boundary layer flow: A simple solution to log-layer mismatch

Tanmoy Chatterjee, Yulia Peet

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A large eddy simulation (LES) methodology coupled with near-wall modeling has been implemented in the current study for high Re neutral atmospheric boundary layer flows using an exponentially accurate spectral element method in an open-source research code Nek5000. The effect of artificial length scales due to subgrid scale (SGS) and near wall modeling (NWM) on the scaling laws and structure of the inner and outer layer eddies is studied using varying SGS and NWM parameters in the spectral element framework. The study provides an understanding of the various length scales and dynamics of the eddies affected by the LES model and also the fundamental physics behind the inner and outer layer eddies which are responsible for the correct behavior of the mean statistics in accordance with the definition of equilibrium layers by Townsend. An economical and accurate LES model based on capturing the near wall coherent eddies has been designed, which is successful in eliminating the artificial length scale effects like the log-layer mismatch or the secondary peak generation in the streamwise variance. Published by AIP Publishing.

Original languageEnglish (US)
Article number075105
JournalPhysics of Fluids
Volume29
Issue number7
DOIs
StatePublished - Jul 1 2017

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atmospheric boundary layer
Atmospheric boundary layer
boundary layer flow
Boundary layer flow
Large eddy simulation
large eddy simulation
vortices
Scaling laws
scale effect
Physics
Statistics
scaling laws
statistics
methodology
physics

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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