Journal ArticleDOI
On nonlinear K-l and K-ε models of turbulence
TLDR
In this paper, a nonlinear K-l and K-e model is proposed to predict the normal Reynolds stresses in turbulent channel flow much more accurately than the linear model, and the nonlinear model is shown to be capable of predicting turbulent secondary flows in non-circular ducts.Abstract:
The commonly used linear K-l and K-e models of turbulence are shown to be incapable of accurately predicting turbulent flows where the normal Reynolds stresses play an important role. By means of an asymptotic expansion, nonlinear K-l and K-e models are obtained which, unlike all such previous nonlinear models, satisfy both realizability and the necessary invariance requirements. Calculations are presented which demonstrate that this nonlinear model is able to predict the normal Reynolds stresses in turbulent channel flow much more accurately than the linear model. Furthermore, the nonlinear model is shown to be capable of predicting turbulent secondary flows in non-circular ducts - a phenomenon which the linear models are fundamentally unable to describe. An additional application of this model to the improved prediction of separated flows is discussed briefly along with other possible avenues of future research.read more
Citations
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Dissertation
A numerical study into the effects of turbulent flows around full-scale buildings
TL;DR: In this paper, the authors describe the development and application of a numerical predictive procedure for turbulent flows around full-scale buildings using a complete Reynolds stress model with two alternative proposals for the pressure-strain correlations and a k-E model used in conjunction with both linear and nonlinear stress-strains relationships.
Journal ArticleDOI
A thermodynamically consistent stress transport model for rotating turbulent flows
Goodarz Ahmadi,Sameer Abu-Zaid +1 more
TL;DR: In this article, a thermodynamically consistent stress transport model for turbulence in a rotating frame of reference is proposed, based on the averaged entropy inequality constitutive equations for the pressure-strain correlation and flux of turbulent stress tensor.
DissertationDOI
Entwicklung expliziter Darstellungen zweiter statistischer Momente zur numerischen Simulation turbulenter Strömungen
Journal ArticleDOI
Effects of aspect ratio and inclination angle on aerodynamic loads of a flat plate
TL;DR: In this article, large eddy simulations are carried out to analyze flow past flat plate in different configurations and inclinations, and the effect of the tip vortices on flow separation from the top and bottom edges is investigated.
Journal ArticleDOI
Anisotropic Reynolds stress tensor representation in shear flows using DNS and experimental data
TL;DR: In this article, the performance of algebraic non-linear models and predict the anisotropy of the Reynolds stresses were investigated. But the authors focused on the non-persistence-of-straining tensors.
References
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Journal ArticleDOI
Progress in the development of a Reynolds-stress turbulence closure
TL;DR: In this article, the authors developed a model of turbulence in which the Reynolds stresses are determined from the solution of transport equations for these variables and for the turbulence energy dissipation rate E. Particular attention is given to the approximation of the pressure-strain correlations; the forms adopted appear to give reasonably satisfactory partitioning of the stresses both near walls and in free shear flows.
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
Numerical investigation of turbulent channel flow
Parviz Moin,John Kim +1 more
TL;DR: In this article, a large-scale flow field was obtained by directly integrating the filtered, three-dimensional, time dependent, Navier-Stokes equations, and small-scale field motions were simulated through an eddy viscosity model.
Book ChapterDOI
Computational Modeling of Turbulent Flows
TL;DR: In this article, it is shown that direct simulation is not an alternative for practical computation and that the various sophisticated closures suffer from essentially the same problems as the direct simulations and therefore, are limited to homogeneous situations.
Journal ArticleDOI
A Reynolds stress model of turbulence and its application to thin shear flows
Kemal Hanjalic,Brian Launder +1 more
TL;DR: In this paper, the authors provided a model of turbulence which effects closure through approximated transport equations for the Reynolds stress tensor the turbulence energy κ and e.g., the turbulent shear stress does not vanish where the mean rate of strain goes to zero.