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Subgrid Length-Scales for Large-Eddy Simulation of Stratified Turbulence

Schumann, U. (1991) Subgrid Length-Scales for Large-Eddy Simulation of Stratified Turbulence. Theoretical and Computational Fluid Dynamics, 2, pp. 279-290. DOI: 10.1007/BF00271468


Official URL: http://www.springer.com/physics/mechanics/journal/162


The influence of buoyancy on the length-scales for the dissipation rate of kinetic energy, and for momentum, heat, and other scalar transport has to be known for subgrid-scale (SGS) models in a large-eddy simulation (LES). For the inertial subrange, Lilly (1967) has shown that grid spacing is the relevant length-scale for SGS effects. Deardorff (1980) proposed to reduce all the length-scales for stable stratification. Numerical and experimental data show, however, that the dissipation length-scale may strongly increase in stable layers with little shear. Lumley's (1964) theory for the energy spectrum in a stratified fluid also suggests such an increase. In this paper we apply the analysis of previous algebraic second-order closure SGS models, parameter studies with different length-scale models in LES, and the analysis of direct simulations of sheared and unsheared stably stratified homogeneous turbulence. These analyses show advantages of firstorder closures for LES and suggest that the limiting effect of stratification should only be applied to the length-scales of vertical eddy-diffusivities of heat and scalars but not to those of momentum and dissipation.

Item URL in elib:https://elib.dlr.de/31456/
Document Type:Article
Title:Subgrid Length-Scales for Large-Eddy Simulation of Stratified Turbulence
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Journal or Publication Title:Theoretical and Computational Fluid Dynamics
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/BF00271468
Page Range:pp. 279-290
Keywords:SGS, LES
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:31 Jul 2019 19:17

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