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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A model intercomparison of CCN-limited tenuous clouds in the high Arctic
R. G. Stevens,Katharina Loewe,Christopher Dearden,Christopher Dearden,Antonios Dimitrelos,Anna Possner,Anna Possner,Gesa K. Eirund,Tomi Raatikainen,Adrian Hill,B. J. Shipway,Jonathan M. Wilkinson,Sami Romakkaniemi,Juha Tonttila,Ari Laaksonen,Hannele Korhonen,Paul Connolly,Ulrike Lohmann,Corinna Hoose,Annica M. L. Ekman,Kenneth S. Carslaw,Paul R. Field,Paul R. Field +22 more
TL;DR: In this article, a model intercomparison of summertime high Arctic clouds was performed during the 2008 Arctic Summer Cloud Ocean Study (ASCOS) campaign, when observed cloud condensation nuclei (CCN) concentrations fell below 1 cm−3.
Journal ArticleDOI
Artificial neural network approach to large-eddy simulation of compressible isotropic turbulence
TL;DR: In an a posteriori analysis, the performance of ANN-7 model shows advantage over the dynamic Smagorinsky model and dynamic mixed model in the prediction of spectra and structure functions of velocity and temperature, and instantaneous flow structures.
Journal ArticleDOI
Tabulated chemistry approach for diluted combustion regimes with internal recirculation and heat losses
TL;DR: In this paper, a turbulent combustion model is developed in a large eddy simulation (LES) framework to characterize the dilution of reactants by burnt gases, the importance of complex chemistry effects is emphasized and taken into account using a detailed chemistry tabulation approach.
Journal ArticleDOI
Large eddy simulations of 45° inclined dense jets
TL;DR: In this article, a detailed numerical investigation was performed using the large eddy simulation (LES) approach with both the Smagorinsky and Dynamic Smagorski subgrid scale (SGS) models to simulate the characteristics of the inclined dense jet with 45° inclination.
Journal ArticleDOI
Sound generation by turbulent boundary-layer flow over small steps
Minsuk Ji,Meng Wang +1 more
TL;DR: In this paper, the aeroacoustics of low-Mach-number boundary-layer flow over backward and forward facing steps were studied using large-eddy simulation and Lighthill's theory.
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.
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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.