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Assessment of grid anisotropy effects on LES models with different length scales

Schumann, Jan-Erik and Toosi, Siavash and Larsson, Johan (2020) Assessment of grid anisotropy effects on LES models with different length scales. AIAA Journal, 58 (10), pp. 1-12. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J059576. ISSN 0001-1452.

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Official URL: https://doi.org/10.2514/1.J059576

Abstract

The effect of the eddy viscosity length scale on the accuracy of large eddy simulation (LES) is investigated for several commonly used subgrid models. Multiple types of length scales are considered, both purely geometric length scales (including the cube-root of the cell volume and the maximum cell dimension) and length scales that depend on both the grid and the flow. The assessment is focused on how the LES prediction changes for increasingly anisotropic grids, in forced isotropic turbulence and channel flow at high Reynolds number. While some length scales perform better than others, the main conclusion is that no single length scale produces LES results that are completely independent of the grid anisotropy. Since every model and length scale tested produces accurate results on at least one grid and inaccurate results on at least one other grid, the study shows clearly the need to assess LES models on multiple grids with multiple different anisotropy ratios.

Item URL in elib:https://elib.dlr.de/135008/
Document Type:Article
Title:Assessment of grid anisotropy effects on LES models with different length scales
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schumann, Jan-ErikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Toosi, SiavashDepartment of Mechanical Engineering, University of Maryland, College Park, MD 20742, USAUNSPECIFIEDUNSPECIFIED
Larsson, JohanDepartment of Mechanical Engineering, University of Maryland, College Park, MD 20742, USAUNSPECIFIEDUNSPECIFIED
Date:18 June 2020
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
DOI:10.2514/1.J059576
Page Range:pp. 1-12
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDAIAAUNSPECIFIEDUNSPECIFIED
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:LES, Anisotropy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Wiederverwendbare Raumfahrtsysteme (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Schumann, Jan-Erik
Deposited On:03 Jul 2020 23:11
Last Modified:24 Oct 2023 14:45

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