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Kappa Distributions and Isotropic Turbulence [PDF]
Entropy (Basel), 2019 In this work, the two-point probability density function (PDF) for the velocity field of isotropic turbulence is modeled using the kappa distribution and the concept of superstatistics. The PDF consists of a symmetric and an anti-symmetric part, whose symmetry properties follow from the reflection symmetry of isotropic turbulence, and the associated ...
Gravanis E +3 more
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Theory and Modelling of Isotropic Turbulence: From Incompressible through Increasingly Compressible Flows [PDF]
AtmosphereHomogeneous isotropic turbulence (HIT) has been a useful theoretical concept for more than fifty years of theory, modelling, and calculations. Some exact results are revisited in incompressible HIT, with special emphasis on the 4/5 Kolmogorov law.
Claude Cambon
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The Spatial Structure of Passively Simulated Atmospheric Boundary Layer Turbulence
Applied Sciences, 2021 Three types of turbulence fields were investigated using a research method combining wind tunnel tests and theoretical analysis to further explore the spatial structure of atmospheric boundary layer turbulence, which was passively simulated by a wind ...
Jiadong Zeng +3 more
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Experimental study on the effect of turbulence on hot-smoke dispersion ejecting in a cross flow
Journal of Thermal Science and Technology, 2022 This study aims to investigate the hot-smoke dispersion behavior released from a chimney in a cross flow experimentally using specially designed wind tunnel.
Xangpheuak INTHAVIDETH +3 more
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On the Statistical Theory of Isotropic Turbulence [PDF]
Proceedings of the Royal Society of London. Series A - Mathematical and Physical Sciences, 1938 Es handelt sich um Strömungen der Eigenschaft, daß der zeitliche Mittelwert jeder Funktion der Geschwindigkeitskomponenten und ihrer ersten Ableitungen, die in einem bestimmten Punkt und bezüglich eines bestimmten Koordinatensystems definiert ist, unverändert bleibt, wenn die Achsen beliebig rotiert oder gespiegelt werden.
de Kármán, Theodore, Howarth, Leslie
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Developing homogeneous isotropic turbulence [PDF]
Physica D: Nonlinear Phenomena, 2012 We investigate the self-similar evolution of the transient energy spectrum which precedes the establishment of the Kolmogorov spectrum in homogeneous isotropic turbulence in three dimensions using the EDQNM closure model. The transient evolution exhibits self-similarity of the second kind and has a non-trivial dynamical scaling exponent which results ...
Bos, Wouter J. T. +2 more
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Liutex-Represented Vortex Spectrum in Turbulence
Entropy, 2022 The Liutex vector is new quantity introduced to represent the rigid-body rotation part of fluid motion and thus to define and identify vortices in various flows. In this work, the intermittency and power-law similarity of the Liutex vector in homogeneous,
Bowen Yan, Yiqian Wang, Chaoqun Liu
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“Equilibrium” and “non-equilibrium” turbulence
Theoretical and Applied Mechanics Letters, 2017 We review the concept of “equilibrium” in turbulence. It generally means a property of the energy spectrum, it can also be understood in terms of a scalar property, the Taylor–Kolmogorov formula relating the dissipation rate to the total energy and ...
Robert Rubinstein, Timothy T. Clark
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Effects of hydrogen addition and turbulence on ignition and meso-scale flames of propane mixtures
Journal of Thermal Science and Technology, 2022 This study has investigated experimentally the effects of hydrogen addition and turbulence on the ignition and the flame-kernel development characteristics in isotropic and homogeneous turbulence for propane mixtures.
Masaya NAKAHARA +4 more
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On the thixotropic effect of turbulence
Theoretical and Applied Mechanics Letters, 2019 As a follow-up research of the work on the natural viscosity of turbulence of Huang et al. [Journal of Turbulence (2003)], here we investigate the thixotropic effect of a turbulent Newtonian fluid on the basis of the ensemble-averaged Navier–Stokes ...
Yu-Ning Huang
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