Journal ArticleDOI
A dynamic subgrid‐scale eddy viscosity model
TLDR
In this article, a new eddy viscosity model is presented which alleviates many of the drawbacks of the existing subgrid-scale stress models, such as the inability to represent correctly with a single universal constant different turbulent fields in rotating or sheared flows, near solid walls, or in transitional regimes.Abstract:
One major drawback of the eddy viscosity subgrid‐scale stress models used in large‐eddy simulations is their inability to represent correctly with a single universal constant different turbulent fields in rotating or sheared flows, near solid walls, or in transitional regimes. In the present work a new eddy viscosity model is presented which alleviates many of these drawbacks. The model coefficient is computed dynamically as the calculation progresses rather than input a priori. The model is based on an algebraic identity between the subgrid‐scale stresses at two different filtered levels and the resolved turbulent stresses. The subgrid‐scale stresses obtained using the proposed model vanish in laminar flow and at a solid boundary, and have the correct asymptotic behavior in the near‐wall region of a turbulent boundary layer. The results of large‐eddy simulations of transitional and turbulent channel flow that use the proposed model are in good agreement with the direct simulation data.read more
Citations
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Journal ArticleDOI
Advances in numerical modelling of swash zone dynamics
Riccardo Briganti,Alec Torres-Freyermuth,Tom E. Baldock,Maurizio Brocchini,Nicholas Dodd,Tian-Jian Hsu,Zhonglian Jiang,Yeulwoo Kim,José Carlos Pintado-Patiño,Matteo Postacchini +9 more
TL;DR: In this article, the authors present a comprehensive and critical review of work on the numerical modelling of swash zone processes between 2005 and 2015, comparing different numerical models against laboratory experiments of a dam-break-driven swash event.
Journal ArticleDOI
Toward Validation of Large Eddy Simulation for Turbulent Combustion
TL;DR: A quantitative overview of the state-of-the-art in large eddy simulation for gas-turbine combustion processes is provided in this paper, with a systematic analysis of the current state of the art and assist in the development of technical performance metrics for model validation.
Journal ArticleDOI
LES-CMC of a dilute acetone spray flame
TL;DR: In this article, a combined Large-Eddy-Simulation (LES) and Conditional Moment Closure (CMC) method has been applied to model spray combustion and additional source terms in the CMC transport equation that originate from the evaporation of the fuel have been modelled and their influence on flame structure and global quantities such as temporally averaged temperature profiles has been analysed.
Journal ArticleDOI
On the interaction between dynamic model dissipation and numerical dissipation due to streamline upwind/Petrov–Galerkin stabilization
TL;DR: In this article, the authors investigate the roles of physical and numerical subgrid-scale modeling, and propose a modification to the dynamic Smagorinsky model as a way to discount the numerical method's algorithmic dissipation from the total subgridscale dissipation.
Journal ArticleDOI
CFD prediction of gaseous diffusion around a cubic model using a dynamic mixed SGS model based on composite grid technique
TL;DR: In this paper, the authors used a Dynamic Mixed SGS (DM) model with the aid of the composite grid technique to predict the turbulent diffusion of gaseous contaminant near a cubic-shaped building model.
References
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General circulation experiments with the primitive equations
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Journal ArticleDOI
Renormalization group analysis of turbulence I. Basic theory
Victor Yakhot,Steven A. Orszag +1 more
TL;DR: In this article, a dynamic renormalization group (RNG) method for hydrodynamic turbulence was developed, which uses dynamic scaling and invariance together with iterated perturbation methods, allowing us to evaluate transport coefficients and transport equations for the large scale (slow) modes.
Journal ArticleDOI
A numerical study of three-dimensional turbulent channel flow at large Reynolds numbers
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Journal ArticleDOI
On Turbulent Flow Near a Wall
TL;DR: In this paper, the authors defined the distance from wall pipe radius pipe diameter mean local velocity parallel to wall velocity fluctuations parallel and normal to flow mass density coefficient of viscosity shear stress velocity correlation coefficient mixing length universal constant in I = Ky modified universal constant eddy viscosities size of roughness friction factor = 8rw/p V 2