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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Posted Content
Turbulence models generator
TL;DR: In this paper, Chen et al. introduced a two-level phase-space, separating microscopic and hydrodynamic modes for turbulent channel flow, based on a far-from-equilibrium isotropic and homogeneous turbulence.
Journal ArticleDOI
Computational Investigation of Conventional and Active-Flow-Control-Enabled High-Lift Configurations
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Proceedings ArticleDOI
Exploring an LBM-VLES Based CFD Approach for Predictions of Aero-Thermal Flows in Generic Turbo-machinery Devices
Yanbing Li,Avinash Jammalamadaka +1 more
TL;DR: A Lattice-Boltzmann Methods coupled with a very large eddy simulation (VLES) is presented and applied to solve complex aero-thermal problems in generic turbo-machinery devices to demonstrate the potential of applying this approach for high Reynolds number, compressible, turbulent flow computations in turbo- machinery applications.
Book ChapterDOI
Gas-Kinetic Scheme for Multiscale Turbulence Simulation
Shuang Tan,Qibing Li,Song Fu +2 more
TL;DR: Based on the extended BGK equation, the gas-kinetic scheme (GKS) was developed for fine simulation of high-Reynolds-number turbulence, and two extended schemes, GKS-DES/IDDES are constructed and show good performances in typical turbulent flow around a cylinder with \(\text {Re}_D=3900\).
Journal ArticleDOI
Effect of Sweep on Axial Fan Noise Sources Using the Lattice Boltzmann Method
TL;DR: In this article , the Lattice Boltzmann method was used to study the effect of blade sweep on the acoustic spectra of axial fans with ±45° fan speeds.
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.
Book
Turbulence modeling for CFD
TL;DR: In this paper, the authors proposed a compressible ecoulement for compressible ECCs, based on the disquette reference record created on 2005-11-18, modified on 2016-08-08.
Small amplitude processes in charged and neutral one-component systems
TL;DR: In this article, a kinetic theory approach to collision processes in ionized and neutral gases is presented, which is adequate for the unified treatment of the dynamic properties of gases over a continuous range of pressures from the Knudsen limit to the high pressure limit where the aerodynamic equations are valid.
Journal ArticleDOI
Development of turbulence models for shear flows by a double expansion technique
TL;DR: In this article, a two-equation model and Reynolds stress transport model are developed for turbulent shear flows and tested for homogeneous shear flow and flow over a backward facing step.
Journal ArticleDOI
The Mathematical Theory of Non-Uniform Gases
TL;DR: Chapman and Cowling as mentioned in this paper showed that the ultimate scope of the descendent of the kinetic theory of gases must be the whole field of the properties of matter in bulk, derived from the atomic constitution of matter and from properties of atoms and their interactions.