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
Citations
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Proceedings ArticleDOI
Sunroof Buffeting of a Simplified Car Model: Simulations of the Acoustic and Flow-induced Responses
Bernd Crouse,Siva Senthooran,Gana Balasubramanian,David Freed,Swen Nölting,Luc Mongeau,Jin-Seok Hong +6 more
Journal ArticleDOI
Rotating coherent flow structures as a source for narrowband tip clearance noise from axial fans
TL;DR: In this paper, both experimental and numerical methods are used to shed more light on the noise generation mechanism of this narrowband tip clearance noise and provide a unified description of this source.
Proceedings ArticleDOI
A Hybrid Lattice-Boltzmann/FW-H Method to Predict Sources and Propagation of Landing Gear Noise
TL;DR: In this article, a hybrid approach to predict the far-field noise generated by an airplane nose landing gear is presented, which consists of a Lattice-Boltzmann method (LBM) for the calculation of the flow-field around the fully detailed geometry of the landing gear which provides the input for a Ffowcs Williams- Hawkings (FW-H) solver to calculate the farfield noise.
Journal ArticleDOI
Scrutinizing lattice Boltzmann methods for direct numerical simulations of turbulent channel flows
TL;DR: In this article, the predictive performance of Lattice Boltzmann methods in turbulent channel flows was reported. But the authors focused on model-free (direct) numerical simulations at R e τ = 180 using essentially different collision models, i.e. the Bhatnagar-Gross-Krook (BGK), the MultipleRelaxation-Time (MRT) and the Cumulant model.
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
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Journal ArticleDOI
Development of turbulence models for shear flows by a double expansion technique
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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.