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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Journal ArticleDOI
Cfd Analysis of Turbulent Flow Past Square Cylinder Using Dynamic Les
TL;DR: In this article, the Lagrangian dynamic Smagorinsky model (LDS model) is introduced to overcome the disadvantages of DS model, e.g., calculation instability.
Journal ArticleDOI
A Parallel Overset Grid High-Order Flow Solver for Large Eddy Simulation
TL;DR: This work describes the development and validation of a parallel high-order compact finite difference Navier–Stokes solver for application to large-eddy simulation (LES) and direct numerical simulation and produces indistinguishable mean flow solutions for the circular cylinder.
Journal ArticleDOI
Large eddy simulations of 45° and 60° inclined dense jets with bottom impact
TL;DR: In this paper, a numerical study with the Large Eddy Simulations (LES) approach was performed to simulate inclined dense jets with 45° and 60° inclinations in a stagnant ambient, including the bottom impact and subsequent spreading on the wall boundary.
Journal ArticleDOI
Numerical and Physical Issues in Large Eddy Simulation of Turbulent Flows
TL;DR: The recent work on large eddy simulation (LES) of turbulent flows at the Center for Turbulence Research is reviewed in this paper, including progress on issues surrounding the governing equations and filtering, subgrid scale and wall layer modeling, and spatial discretization.
Journal ArticleDOI
Numerical simulation of a spatially developing accelerating boundary layer over roughness
Junlin Yuan,Ugo Piomelli +1 more
TL;DR: In this article, the authors investigate the coupling between the effects of roughness and strong free-stream acceleration on a rough wall and show that roughness leads to more responsive turbulence and prevents the strong acceleration from stabilizing the turbulence, and the acceleration intensifies the velocity scale of the wake field.
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.