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
More filters
Journal ArticleDOI
Subgrid-scale modeling for implicit large eddy simulation of compressible flows and shock-turbulence interaction
TL;DR: In this article, a model for implicit Large Eddy Simulation (LES) of compressible flows that is applicable to a broad range of Mach numbers and particularly efficient for LES of shock-turbulence interaction is presented.
Journal ArticleDOI
A numerical study on the eddy structures of impinging jets excited at the inlet
TL;DR: In this paper, three-dimensional eddy structures arising in plane and round impinging jets excited at the nozzle inlet were investigated numerically by direct numerical simulation and large eddy simulation and it was found that the round jet showed definite instability at λ / πD =1/6 while the plane jet showed almost equivalent sensitivity to all modes tested here.
Journal ArticleDOI
Numerical simulation of vortices with axial velocity deficits
Saad A. Ragab,Madhu Sreedhar +1 more
TL;DR: In this article, Batchelor et al. studied the response of vortices with axial velocity deficits to random and controlled disturbances at high Reynolds numbers, and the q vortex was used as a model of such vortexices.
Journal ArticleDOI
Investigation of the LES WALE turbulence model within the lattice Boltzmann framework
TL;DR: The LES WALE model, which can be used without wall functions or global damping functions, is investigated within the lattice Boltzmann framework, which produces an efficient and fast scheme due to its algebraic character.
Journal ArticleDOI
Evolution and modelling of subgrid scales during rapid straining of turbulence
TL;DR: In this paper, the response, evolution, and modelling of subgrid-scale (SGS) stresses during rapid straining of turbulence is studied experimentally, where the SGS stress is subdivided to a stress due to the mean distortion, a cross-term (the interaction between the mean and turbulence), and the turbulent S GS stress τ(T)ij.
References
More filters
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
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