Results 31 to 40 of about 1,146 (113)
Transition from the chaotic turbulence to the turbulent structures
Discrete Dynamics in Nature and Society, 1999 Weak turbulence, similar to incoherent light, may be represented as an ensemble of quasi-free quanta or Fourier harmonics. Unlike it, strongly turbulent state should be based on nonlinear structures.
A. Kingsep
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Study on the turbulence transition in the pedestal of high-density H-mode plasmas in EAST
Nuclear FusionIn the Experimental Advanced Superconducting Tokamak (EAST), a transition from electromagnetic to electrostatic turbulence is observed in the pedestal region as plasma density ramps up.
You Li +28 more
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Transition from weak to strong turbulence in magnetized plasmas
New Journal of Physics, 2019 The scaling of turbulent heat flux with respect to electrostatic potential is examined in the framework of a reduced (4D) kinetic system describing electrostatic turbulence in magnetized plasmas excited by the ion temperature gradient instability ...
Vasil Bratanov +2 more
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Highly optimized transitions to turbulence [PDF]
Proceedings of the 41st IEEE Conference on Decision and Control, 2002., 2004 We study the Navier-Stokes equations in three dimensional plane Couette flow geometry subject to stream-wise constant initial conditions and perturbations. The resulting two dimensional/three component (2D/3C) model has no bifurcations and is globally (non-linearly) stable for all Reynolds numbers R, yet has a total transient energy amplification that ...
Bobba, K. M., Bamieh, B., Doyle, J. C.
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MathematicsHeated pipe flow is widely used in thermal engineering applications, but the presence of buoyancy force can cause intermittency, or multiple flow states at the same parameter values.
Shijun Chu +2 more
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Recent advances in plasma control and physics research in the Large Helical Device
Nuclear FusionThe Large Helical Device (LHD), the largest superconducting helical system in the world, is equipped with advanced heating and diagnostic tools, facilitating plasma control and physics research.
K. Tanaka +54 more
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Length Scale of Free Stream Turbulence and Its Impact on Bypass Transition in a Boundary Layer
Journal of Applied Fluid Mechanics, 2017 An experimental investigation was carried out to study the turbulent flow over a flat plate in a subsonic wind tunnel. The enhanced level of turbulence was generated by five wicker grids with square meshes, and different parameters (diameter of the grid ...
J. Grzelak, Z. Wierciński
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Laminar Pipe Flow Instability: A Theoretical-Experimental Perspective
FluidsThis paper revisits the theoretically predicted inherent stability of fully developed laminar pipe flow, which remains unconfirmed by experimental evidence.
Franz Durst, El-Sayed Zanoun
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Transition in hypersonic boundary layers
AIP Advances, 2015 Transition and turbulence production in a hypersonic boundary layer is investigated in a Mach 6 wind tunnel using Rayleigh-scattering visualization, fast-response pressure measurements, and particle image velocimetry.
Chuanhong Zhang +7 more
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Numerical Simulation of Bypass Transition by the Approach of Intermittency Transport Equation
Journal of Fluid Science and Technology, 2009 This paper deals with the development of a numerical approach to predict freestream turbulence-induced (FST-induced) boundary layer bypass transition using an intermittency transport equation.
Most. Nasrin AKHTER +2 more
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