Results 21 to 30 of about 1,146 (113)

Discontinuous transition to active nematic turbulence

Nature Communications
Active fluids exhibit chaotic flows at low Reynolds number known as active turbulence. Whereas the statistical properties of the chaotic flows are increasingly well understood, the nature of the transition from laminar to turbulent flows as activity ...
Malcolm Hillebrand, Ricard Alert
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Transition to dilatation-dominated isothermal compressible turbulence

Physical Review Research
The kinetic energy dissipation rate is of central importance for small-scale statistics in turbulent flows. Here, we report a transition to the dilatation-dominated regime of three-dimensional isothermal fully compressible, homogeneous, isotropic ...
Shadab Alam, Christoph Federrath, Jörg Schumacher   +2 more
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Transitional–turbulent spots and turbulent–turbulent spots in boundary layers [PDF]

Proceedings of the National Academy of Sciences, 2017
Significance Uncovering the constitutive coherent structure in the inner layer of the canonical turbulent boundary layer has remained a central fluid mechanics theme, because it tests our intellectual ability to understand even the simplest external flow.
Xiaohua, Wu, Parviz, Moin, James M, Wallace, Jinhie, Skarda, Adrián, Lozano-Durán, Jean-Pierre, Hickey   +5 more
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Evolution of edge turbulence and shear flow approaching the density limit in L-mode plasmas on EAST

Nuclear Fusion
The evolution of edge turbulence and shear flow approaching the density limit in L-mode plasmas on EAST is investigated. The relative fluctuation, cross-correlation power spectral density (CPSD), wave-number spectra, skewness and kurtosis, along with the
P. Wang, G.H. Hu, L. Chen, R. Chen, L. Wang, G.S. Xu, J. Cheng, X.S. Jiang, X.D. Ye, L.L. Shan, Q.Q. Yang, X. Lin, G.F. Ding, D.G. Wu, Y. Lan, N. Yan, J. Peng   +16 more
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Smooth transitional RANS model and applications with crossflow effects

Advances in Aerodynamics
Transitional Reynolds-averaged Navier–Stokes (RANS) models have become relevant in the computational fluid dynamics (CFD) community as a practical approach to predict the transition to turbulence over the surface of aerospace configurations. These models
Aline Roberta Santos Righi, Gustavo L. O. Halila, João Luiz F. Azevedo   +2 more
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Transition to Equilibrium and Coherent Structure in Ideal MHD Turbulence

Fluids, 2023
Transition of ideal, homogeneous, incompressible, magnetohydrodynamic (MHD) turbulence to near-equilibrium from non-equilibrium initial conditions is examined through new long-time numerical simulations on a 1283 periodic grid.
John V. Shebalin
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Transition to turbulence in duct flow [PDF]

Journal of Fluid Mechanics, 2008
The transition of the flow in a duct of square cross-section is studied. Like in the similar case of the pipe flow, the motion is linearly stable for all Reynolds numbers; this flow is thus a good candidate to investigate the ‘bypass’ path to turbulence.
BIAU D, SOUEID H, BOTTARO, ALESSANDRO
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Effects of the Uncertainty of Wall Distance on the Simulation of Turbulence/Transition Phenomena

Aerospace
The uncertainty of the turbulence/transition model is a problem with relatively high attention in the CFD area. Wall distance is an important physical parameter in turbulence/transition modeling, and its accuracy has a large effect on numerical ...
Weiwei Tan, Heran Zhang, Lan Wang, Shengyang Nie, Jin Jiao, Yingtao Zuo   +5 more
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Transitions and probes in turbulent helium [PDF]

Physical Review E, 1997
Previous analysis of a Paris turbulence experiment \cite{zoc94,tab95} shows a transition at the Taylor Reynolds number $\rel \approx 700$. Here correlation function data is analyzed which gives further evidence for this transition. It is seen in both the power spectrum and in structure function measurements. Two possible explanations may be offered for
Emsellem, Virginie, Kadanoff, Leo P., Lohse, Detlef, Tabeling, Patrick, Wang, Z. Jane   +4 more
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Rotating disks and cones a centennial of von Kármán’s 1921 paper

Journal of Fluid Science and Technology, 2023
It is now more than 100 years since the work of von Kármán (1921) on the boundary-layer flow over a rotating disk was published in the first volume of Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM, Vol. 1(4), pp 233-252).
Kentaro KATO, Rebecca J. LINGWOOD, P. Henrik ALFREDSSON   +2 more
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