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
Large-eddy simulation of the flow in a lid-driven cubical cavity
TL;DR: In this article, a large-eddy simulation of the turbulent flow in a lid-driven cubical cavity has been carried out at a Reynolds number of 12000 using spectral element methods, and two distinct subgrid-scales models, namely a dynamic Smagorinsky model and a dynamic mixed model, have been both implemented and used to perform longlasting simulations required by the relevant time scales of the flow.
Journal ArticleDOI
Implementation Issues of the Conditional Moment Closure Model in Large Eddy Simulations
TL;DR: In this paper, different ways of transferring information regarding the mixture fraction, its sub-grid scale variance and the scalar dissipation rate are examined in terms of a Large Eddy Simulation (LES)/Conditional Moment Closure (CMC) calculation.
Journal ArticleDOI
Sensitivity of the scale partition for variational multiscale large-eddy simulation of channel flow
TL;DR: The variational multiscale method has been shown to perform well for large-eddy simulation (LES) of turbulent flows as discussed by the authors, which relies upon a partition of the resolved velocity field into large and small-scale components.
Journal ArticleDOI
A framework for coupling Reynolds-averaged with large-eddy simulations for gas turbine applications
TL;DR: In this article, the authors use different specialized flow solvers based on the Reynolds-averaged Navier-Stokes equations as well as largeeddy simulations for different parts of the flow domain, running simultaneously and exchanging information at the interfaces.
Journal ArticleDOI
Internal gravity waves generated by a turbulent bottom Ekman layer
John Taylor,Sutanu Sarkar +1 more
TL;DR: In this paper, internal gravity waves excited by the turbulent motions in a bottom Ekman layer are examined using large-eddy simulation, where the outer flow is steady and uniformly stratified while the density gradient is set to zero at the flat lower wall.
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.
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Turbulence statistics in fully developed channel flow at low reynolds number
TL;DR: In this article, a direct numerical simulation of a turbulent channel flow is performed, where the unsteady Navier-Stokes equations are solved numerically at a Reynolds number of 3300, based on the mean centerline velocity and channel half-width, with about 4 million grid points.
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
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
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