Results 41 to 50 of about 1,146 (113)
Phase transitions in anisotropic turbulence
Chaos: An Interdisciplinary Journal of Nonlinear ScienceTurbulence is a widely observed state of fluid flows, characterized by complex, nonlinear interactions between motions across a broad spectrum of length and time scales. While turbulence is ubiquitous, from teacups to planetary atmospheres, oceans, and stars, its manifestations can vary considerably between different physical systems.
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Laminar-to-Turbulence Transition Revealed Through a Reynolds Number Equivalence
Engineering, 2019 Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulence—is one of the most important research subjects in the history of engineering.
Xiao Dong Chen
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Eos, Transactions American Geophysical Union, 1983 Naturally occurring fluid flows are seldom in a state of fully developed turbulence, except near boundaries. The upper atmosphere and the ocean, in and below the thermocline, are dominated by wave‐like motions. Turbulence when, and where, it occurs is sporadic and short‐lived; it is transitional rather than maintained.
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Particle-resolved study of the onset of turbulence
Physical Review ResearchThe transition from laminar to turbulent flow is an immensely important topic that is still being studied. Here we show that complex plasmas, i.e., microparticles immersed in a low temperature plasma, make it possible to study the particle-resolved onset
E. Joshi, M. H. Thoma, M. Schwabe
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Transition to turbulence in a shear flow
Physical Review E, 1999 We analyze the properties of a 19 dimensional Galerkin approximation to a parallel shear flow. The laminar flow with a sinusoidal shape is stable for all Reynolds numbers Re. For sufficiently large Re additional stationary flows occur; they are all unstable.
Eckhardt, Bruno, Mersmann, Alois
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Alexandria Engineering Journal, 2018 One of the big challenges, yet to be addressed, in the numerical simulation of cavitating flow on marine propellers is; the existence of laminar and turbulence transition flows over the propeller’s blades.
Mohamed M. Helal +3 more
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Phase transitions in wave turbulence
Physical Review E, 2012 We consider turbulence within the Gross-Pitaevsky model and look into the creation of a coherent condensate via an inverse cascade originating at small scales. The growth of the condensate leads to a spontaneous breakdown of statistical symmetries of overcondensate fluctuations: First, isotropy is broken, then a series of phase transitions marks the ...
Natalia, Vladimirova +2 more
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Onset of meso-scale turbulence in active nematics
Nature Communications, 2017 Bacteria continuously inject energy into their surroundings and thus induce chaotic like flows, namely meso-scale turbulence. Here, the authors show that transition to meso-scale turbulence and inertial turbulence observed in pipes share the same scaling
Amin Doostmohammadi +3 more
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Direct and noisy transitions in a model shear flow
Theoretical and Applied Mechanics Letters, 2015 The transition to turbulence in flows where the laminar profile is linearly stable requires perturbations of finite amplitude. “Optimal” perturbations are distinguished as extrema of certain functionals, and different functionals give different optima ...
Marina Pausch, Bruno Eckhardt
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Symbolic regression modelling of the linear growth rates of stationary cross-flow instabilities
FlowAccurately predicting the growth rates of stationary cross-flow instabilities is crucial for understanding transition mechanisms in swept-wing configurations, which can significantly impact aerodynamic performance.
Lucas Pascal
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