Journal ArticleDOI
Expanded analogy between Boltzmann kinetic theory of fluids and turbulence
TLDR
In this article, the effects of turbulent fluctuations have a striking resemblance to those of microscale (thermal) fluctuations in laminar flows, even to higher order in the Knudsen number.Abstract:
We demonstrate that the effects of turbulent fluctuations have a striking resemblance to those of microscale (thermal) fluctuations in laminar flows, even to higher order in the Knudsen number. This suggests that there may be a good basis for understanding turbulence in terms of Boltzmann kinetic theory. If so, turbulence may be better described in terms of ‘mixing times’ rather than the more classical ‘mixing lengths’. Comparisons are made to Reynolds-stress turbulence models.read more
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Proceedings ArticleDOI
Numerical Simulations of Natural and Actuated Flow over a 3D, Low-Aspect-Ratio Airfoil
David R. Williams,Tim Colonius +1 more
TL;DR: In this article, numerical simulations of the unsteady flow over a low-aspect-ratio, low Reynolds number semi-circular planform wing are performed using Lattice Boltzmann method.
Journal ArticleDOI
Active flow control analysis at the rear of an SUV
Yoann Eulalie,Elisabeth Fournier,Philippe Gilotte,David Holst,Shaun Johnson,Christian Navid Nayeri,Thomas Schütz,Dirk Wieser +7 more
TL;DR: In this paper, the authors present an experimental investigation of an active flow control solution mounted at rear of a sport utility vehicle (SUV) with the objective of drag reduction, thanks to a selection of flow control parameters leading to a pressure increase on the tailgate.
Journal ArticleDOI
On non-perturbative formulation of hydrodynamics using kinetic theory
TL;DR: In this article, a coarse-grained statistical description of turbulent eddies with a specified non-constant interaction time is proposed for modeling turbulent flows including strongly non-equilibrium non-homogeneous turbulence phenomena, such as rapid distortion effects and secondary turbulent structures.
Proceedings ArticleDOI
Lattice-Boltzmann Simulations of the JAXA JSM High-Lift Configuration
Benedikt Konig,Ehab Fares,Mitsuhiro Murayama,Yasushi Ito,Yuzuru Yokokawa,Kazuomi Yamamoto,Kazu Ishikawa +6 more
Journal ArticleDOI
Numerical analyses of liquid slosh by Finite volume and Lattice Boltzmann methods
Chen Yang,Ran Niu,Peng Zhang +2 more
TL;DR: In this paper, the authors proposed two numerical models, Finite Volume Method (FVM) and Lattice Boltzmann method (LBM), to perform the quick evaluation of liquid slosh behavior under different container designs.
References
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Journal ArticleDOI
The numerical computation of turbulent flows
Brian Launder,D. B. Spalding +1 more
TL;DR: In this paper, the authors present a review of the applicability and applicability of numerical predictions of turbulent flow, and advocate that computational economy, range of applicability, and physical realism are best served by turbulence models in which the magnitudes of two turbulence quantities, the turbulence kinetic energy k and its dissipation rate ϵ, are calculated from transport equations solved simultaneously with those governing the mean flow behaviour.
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Journal ArticleDOI
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