Analysis of Mesh-Independent Subfilter-Scale Models for Turbulent Flows

1999 ◽  
pp. 263-274
Author(s):  
J.-C. Magnient ◽  
P. Sagaut ◽  
M. Deville
Keyword(s):  
Turbulent Flows ◽  
Scale Models

scholarly journals Physical consistency of subgrid-scale models for large-eddy simulation of incompressible turbulent flows

2017 ◽  
Vol 29 (1) ◽  
pp. 015105 ◽  
Author(s):  
Maurits H. Silvis ◽  
Ronald A. Remmerswaal ◽  
Roel Verstappen
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flows ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Scale Models ◽  
Large Eddy

Second Law Characterization of Confined Turbulent Flows

2012 ◽  
Vol 134 (11) ◽  
Author(s):  
G. F. Naterer ◽  
O. B. Adeyinka
Keyword(s):  
Entropy Production ◽  
Turbulent Flows ◽  
Particle Image ◽  
Field Measurements ◽  
Reynolds Numbers ◽  
Channel Flows ◽  
Image Velocimetry ◽  
Scale Models ◽  
Confined Channel

In this paper, a new measurement technique for turbulent entropy production is developed and applied to confined channel flows. Past methods of dimensional analysis, Clark gradient, and Smagorinsky models for subgrid turbulent stresses are examined to determine the flow irreversibilities throughout the flow field. The new experimental method obtains the turbulent irreversibilities up to a certain particle image velocimetry (PIV) cut-off wavelength, very close to the wall of the channel. Measured results of turbulence dissipation and entropy production at varying Reynolds numbers are presented and compared successfully against results from direct numerical simulations. The subgrid scale models of turbulent flow irreversibilities are shown to provide an effective alternative to direct PIV averaging of turbulent stresses, particularly close to the wall, where PIV resolution makes it difficult to precisely determine the averaged turbulence fluctuations. This paper develops a new PIV based method that enables the whole-field measurements of turbulent entropy production, and it presents new experimental data for entropy production in channel flows.

scholarly journals Toward the large-eddy simulation of compressible turbulent flows

1992 ◽  
Vol 238 ◽  
pp. 155-185 ◽  
Author(s):  
G. Erlebacher ◽  
M. Y. Hussaini ◽  
C. G. Speziale ◽  
T. A. Zang
Keyword(s):  
Large Eddy Simulation ◽  
Linear Combination ◽  
Turbulent Flows ◽  
Isotropic Turbulence ◽  
Collocation Methods ◽  
Subgrid Scale ◽  
Fine Grid ◽  
Eddy Simulation ◽  
Scale Models ◽  
Large Eddy

New subgrid-scale models for the large-eddy simulation of compressible turbulent flows are developed and tested based on the Favre-filtered equations of motion for an ideal gas. A compressible generalization of the linear combination of the Smagorinsky model and scale-similarity model, in terms of Favre-filtered fields, is obtained for the subgrid-scale stress tensor. An analogous thermal linear combination model is also developed for the subgrid-scale heat flux vector. The two dimensionless constants associated with these subgrid-scale models are obtained by correlating with the results of direct numerical simulations of compressible isotropic turbulence performed on a 963 grid using Fourier collocation methods. Extensive comparisons between the direct and modelled subgrid-scale fields are provided in order to validate the models. A large-eddy simulation of the decay of compressible isotropic turbulence – conducted on a coarse 323 grid – is shown to yield results that are in excellent agreement with the fine-grid direct simulation. Future applications of these compressible subgrid-scale models to the large-eddy simulation of more complex supersonic flows are discussed briefly.

Modeling of Free Surface Effects Via Subgrid Scale Models

2004 ◽  
Author(s):  
Zeynep N. Cehreli ◽  
Ibrahim Yavuz ◽  
Ismail B. Celik
Keyword(s):  
Free Surface ◽  
Turbulent Flows ◽  
Mesh Size ◽  
Surface Effects ◽  
Subgrid Scale ◽  
Ship Wake ◽  
Eddy Simulation ◽  
Surface Ship ◽  
Scale Models ◽  
Large Eddy

In large eddy simulation, the key to the reliability of the solution with relatively large mesh size (this is unavoidable for high Re flows) is to develop effective and physically correct subgrid-scale (SGS) models. The behavior of various SGS models in large eddy simulations (LES) of free surface turbulent flows is investigated. The anisotropy of the turbulence observed near a free surface even a sub-grid scales can not be realized by a standard Smagorinsky model (SMG). The SMG model is improved with free surface modifications. This model is verified on an open channel flow benchmark and then applied to the simulation of a surface ship wake. The turbulence features are studied and compared with the results of a simulation without free surface effects. The modifications in the SGS model damps the vertical velocity fluctuations as desired. This study provides a better understanding of SGS models, when applied to the case of the wake of a turning surface ship.

scholarly journals A posteriori tests of subgrid-scale models in strongly anisothermal turbulent flows

2019 ◽  
Vol 31 (6) ◽  
pp. 065113 ◽  
Author(s):  
D. Dupuy ◽  
A. Toutant ◽  
F. Bataille
Keyword(s):  
Turbulent Flows ◽  
A Posteriori ◽  
Subgrid Scale ◽  
Scale Models
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