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Laminar-Turbulent Transition and Turbulence
2014The state of the boundary layer, laminar or turbulent, influences the drag, the performance of the wing, of stabilization and control devices etc., and the flight characteristics of an airplane. A given flight vehicle is considered as “transition insensitive”, if the location of laminar-turbulent transition does not affect these items.
Wilhelm Kordulla +2 more
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Is grid turbulence Saffman turbulence?
Journal of Fluid Mechanics, 2009There has been a longstanding debate as to whether the large scales in grid turbulence should be classified as of the Batchelor or Saffman type. In the former, the integral scales, u and ℓ, satisfy u2ℓ5 ≈ constant, while in Saffman turbulence we have u2ℓ3 = constant.
Per-Åge Krogstad, Peter Davidson
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Compressible turbulence and turbulent convection
2003In the previous chapters turbulence was assumed incompressible. As discussed in Section 2.3, this assumption is valid if either the sonic Mach number of the flow is small, M s = υ/c s « 1, or the Alfven Mach number is small, M A = υ/υ A « 1.
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Physical Review Letters, 1990
Summary: Quantum turbulence in an antisymmetric-tensor model of superfluids at zero temperature is an effect analogous to vacuum polarization in electrodynamics: it is due to a quantum-mechanical instability in the presence of a strong background field. In place of pair creation there is the spontaneous formation of expanding loops of vorticity.
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Summary: Quantum turbulence in an antisymmetric-tensor model of superfluids at zero temperature is an effect analogous to vacuum polarization in electrodynamics: it is due to a quantum-mechanical instability in the presence of a strong background field. In place of pair creation there is the spontaneous formation of expanding loops of vorticity.
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2005
Turbulence est synonyme d’agitation, désordre, chaos. L’évolution spatiale ou temporelle de nombreux phénomènes est caractérisée par une absence apparente d’ordre, la coexistence d’échelles très différentes, l’impossibilité d’une reproduction et d’une prévision détaillées.
Coantic, Michel +2 more
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Turbulence est synonyme d’agitation, désordre, chaos. L’évolution spatiale ou temporelle de nombreux phénomènes est caractérisée par une absence apparente d’ordre, la coexistence d’échelles très différentes, l’impossibilité d’une reproduction et d’une prévision détaillées.
Coantic, Michel +2 more
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Russian Mathematical Surveys, 1983
In the school of Kolmogorov the theory of turbulence is developed like statistical hydromechanics [the author and \textit{A. M. Yaglom}, Statistical hydromechanics. Vol. I (1965; Zbl 0128.440) and Vol. II (1967; Zbl 0193.567)], in which hydrodynamic fields describing turbulent flows of fluids or gases and satisfying the equations of hydrothermodynamics
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In the school of Kolmogorov the theory of turbulence is developed like statistical hydromechanics [the author and \textit{A. M. Yaglom}, Statistical hydromechanics. Vol. I (1965; Zbl 0128.440) and Vol. II (1967; Zbl 0193.567)], in which hydrodynamic fields describing turbulent flows of fluids or gases and satisfying the equations of hydrothermodynamics
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1990
Turbulence is an enigmatic state of fluid flow that includes unpredictable fluctuations even when the flow’s boundary conditions are steady and smooth. These fluctuations typically occur over a wide range of length and time scales. For analysis, a turbulent flow is decomposed into average (or mean) and fluctuating fields.
Pijush K. Kundu +2 more
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Turbulence is an enigmatic state of fluid flow that includes unpredictable fluctuations even when the flow’s boundary conditions are steady and smooth. These fluctuations typically occur over a wide range of length and time scales. For analysis, a turbulent flow is decomposed into average (or mean) and fluctuating fields.
Pijush K. Kundu +2 more
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1987
International audience ; This is the 4th edition of a book originally published by Kluwer Academic Publishers. It is an exhaustive monograph on turbulence in fluids in its theoretical and applied aspects, with many advanced developments using mathematical spectral methods (two-point closures like the EDQNM theory), direct-numerical simulations, and ...
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International audience ; This is the 4th edition of a book originally published by Kluwer Academic Publishers. It is an exhaustive monograph on turbulence in fluids in its theoretical and applied aspects, with many advanced developments using mathematical spectral methods (two-point closures like the EDQNM theory), direct-numerical simulations, and ...
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Studies in Turbulence and Turbulence Control
1993Abstract : Projects studied under this AFOSR grant are- summarized. They concern the following aspects, and are believed to be of interest for both applications and fundamentals of fluid mechanics and aerospace sciences: (1) Flow Control, (2) Chaos and universality in wakes behind circular cylinders, (3) Absolute instability and the dynamics of ...
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