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
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An improved dynamic non-equilibrium wall-model for large eddy simulation
George Ilhwan Park,Parviz Moin +1 more
TL;DR: In this paper, a non-equilibrium wall model based on unsteady 3D Reynolds-averaged Navier-Stokes (RANS) equations has been implemented in an unstructured mesh environment.
Journal Article
Large eddy simulation of a nonpremixed reacting jet: Application and assessment of subgrid-scale combustion models
TL;DR: In this paper, the results from large eddy simulations (LES) and direct numerical simulations (DNS) of a two-dimensional, spatially developing, compressible planar free jet undergoing an idealized, exothermic, chemical reaction of the type F+rOx→(1+r)P are presented in order to assess several subgrid-scale combustion models.
Journal ArticleDOI
Modeling Flow around Bluff Bodies and Predicting Urban Dispersion Using Large Eddy Simulation
TL;DR: This study describes a large eddy simulation (LES) tool including a new dynamic subgrid closure and boundary treatment to model urban dispersion problems, and sets the minimum grid resolution and subgrid model requirements needed to apply LES in simulations of neutral atmospheric boundary layer flow and scalar transport over a realistic urban geometry.
Journal ArticleDOI
A general inflow turbulence generator for large eddy simulation
TL;DR: In this article, a general inflow turbulence generator for numerical simulation of a spatially correlated turbulent flow field is presented, which can strictly guarantee divergence-free condition without any additional improving step and synthetically generate inflows satisfying prescribed spatial anisotropy and correlation conditions.
Journal ArticleDOI
Numerical modeling of the flow field and performance in cyclones of different cone-tip diameters
Khairy Elsayed,Christian Lacor +1 more
TL;DR: In this article, the effect of cone tip-diameter on the flow field and performance of cyclone separator was investigated computationally and via mathematical models using large eddy simulation (LES).
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.