Journal ArticleDOI
A proposed modification of the Germano subgrid‐scale closure method
TLDR
In this paper, the subgrid-scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses.Abstract:
The subgrid‐scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses. This modification removes a source of singularity and is believed to improve the method’s applicability.read more
Citations
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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
LES of open rotor–stator flow
Helge I. Andersson,Magne Lygren +1 more
TL;DR: In this article, the axisymmetric and statistically steady turbulent flow between a rotating and a fixed disk has been analyzed in an unshrouded rotor-stator configuration.
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.
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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.
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Numerical simulations of spatially developing, accelerating boundary layers
Ugo Piomelli,Junlin Yuan +1 more
TL;DR: In this paper, the results of direct and large-eddy simulations of spatially developing boundary layers subjected to favorable pressure gradient, strong enough to cause reversion of the flow towards a quasi-laminar state, are presented.
References
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Journal ArticleDOI
General circulation experiments with the primitive equations
TL;DR: In this article, an extended period numerical integration of a baroclinic primitive equation model has been made for the simulation and the study of the dynamics of the atmosphere's general circulation, and the solution corresponding to external gravitational propagation is filtered by requiring the vertically integrated divergence to vanish identically.
Journal ArticleDOI
A dynamic subgrid‐scale eddy viscosity model
TL;DR: 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.
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A numerical study of three-dimensional turbulent channel flow at large Reynolds numbers
TL;DR: In this article, the three-dimensional, primitive equations of motion have been integrated numerically in time for the case of turbulent, plane Poiseuille flow at very large Reynolds numbers.
Journal ArticleDOI
A dynamic subgrid‐scale model for compressible turbulence and scalar transport
TL;DR: Germano et al. as discussed by the authors generalized the dynamic subgrid-scale (SGS) model for the large eddy simulation (LES) of compressible flows and transport of a scalar.
On the application of the eddy viscosity concept in the Inertial sub-range of turbulence
TL;DR: In this paper, it was shown that an eddy diffusion hypothesis for use in numerical solutions of turbulent flow problems is consistent with the existence of an inertial subrange at the smallest resolvable scale of the numerical model.