Laboratoire de Mécanique des Fluides et d'Acoustique - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Accueil > Équipes > Turbulence & Instabilités

Turbulence & Instabilités

Responsable : Florence Raynal

Les activités de l’équipe, à caractère plutôt fondamentales, concernent l’analyse des instabilités hydrodynamiques, la transition laminaire/turbulence, les écoulements turbulents, et les écoulements à petite échelle.


 Les actualités de T&I : 

Turbulence and Instabilities in Plasma Flows

Workshop at École Centrale de Lyon

Turbulence and Instabilities in Plasma Flows

25-27 Nov 2019 Écully (France)

Plasma flows are ubiquitous in nature – pervading the Earth’s environment through the interplanetary space – while hot and cold plasmas are operated every day in research, industrial and public (...)

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Linking dissipation, anisotropy, and intermittency in rotating stratified turbulence at the threshold of linear shear instabilities

Article dans Phys. Fluids (2019)

Linking dissipation, anisotropy, and intermittency in rotating stratified turbulence at the threshold of linear shear instabilities

Annick Pouquet, Duane Rosenberg & Raffaele Marino

Analyzing a large database of high-resolution three-dimensional direct numerical simulations of decaying rotating stratified flows, we show that anomalous mixing and dissipation, marked (...)

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Effect of high frequency vibrations on PV silicon purification

Article dans Journal of crystal growth (2020)

Effect of high frequency vibrations on PV silicon purification

Samia Bouarab, Faiza Mokhtari, Slim Kaddeche, Daniel Henry, Valéry Botton, Abdessamed Medelfef

Silicon purification for photovoltaic applications is a crucial challenge to improve the energy production performance of solar panels. In the present work, we focus on the metallurgical grade (...)

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Experimental investigation of vertical turbulent transport of a passive scalar in a boundary layer : Statistics and visibility graph analysis

Article dans Phys. Rev. Fluids (2019)

Experimental investigation of vertical turbulent transport of a passive scalar in a boundary layer : Statistics and visibility graph analysis

G. Iacobello, M. Marro, L. Ridolfi, P. Salizzoni & S. Scarsoglio

The dynamics of a passive scalar plume in a turbulent boundary layer is experimentally investigated via vertical turbulent transport time series. Experimental data are acquired in a rough-wall (...)

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Assessing the nonequilibrium of decaying turbulence with reversed initial fields

Article dans Phys. Rev. Fluids (2019)

Assessing the nonequilibrium of decaying turbulence with reversed initial fields

F. Liu, L. P. Lu, Wouter J. T. Bos & Le Fang

Recently, it was observed that in nonequilibrium turbulent flows the normalized dissipation rate depends in a fairly universal way on the Reynolds number of the flow. To assess theoretical (...)

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Diffusiophoresis, Batchelor scale and effective Péclet numbers

Article dans J. Fluid. Mech. (2019)

Diffusiophoresis, Batchelor scale and effective Péclet numbers

Florence Raynal & Romain Volk

We study the joint mixing of colloids and salt released together in a stagnation point or in a globally chaotic flow. In the presence of salt inhomogeneities, the mixing time is strongly modified (...)

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Effect of fluid inertia on the orientation of a small prolate spheroid settling in turbulence

Article dans New Journal of Physics (2019)

Effect of fluid inertia on the orientation of a small prolate spheroid settling in turbulence

Kristian Gustavsson, Muhammad Zubair Sheikh, Diego Lopez, Aurore Naso, Alain Pumir and Bernard Mehlig

We study the angular dynamics of small non-spherical particles settling in a turbulent flow, such as ice crystals in clouds, aggregates of organic material in the oceans, or fibres settling in (...)

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Observing mesospheric turbulence with specular meteor radars : A novel method for estimating second order statistics of wind velocity

Article dans Earth and Space Science (2019)

Observing mesospheric turbulence with specular meteor radars : A novel method for estimating second order statistics of wind velocity

J. Vierinen, J. L. Chau, H. Charuvil, J.M.Urco, M. Clahsen, V. Avsarkisov, R. Marino, and R. Volz

There are few observational techniques for measuring the distribution of kinetic energy within the mesosphere with a wide range of spatial and temporal scales. This study describes a method for (...)

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The low-frequency break observed in the slow solar wind magnetic spectra

Article dans Astronomy & Astrophysics (2019)

The low-frequency break observed in the slow solar wind magnetic spectra

Roberto Bruno, Daniele Telloni, Luca Sorriso-Valvo, Raffaele Marino, Rossana De Marco, Raffaela D’Amicis

Fluctuations of solar wind magnetic field and plasma parameters exhibit a typical turbulence power spectrum with a spectral index ranging between ∼ 5/3 and ∼ 3/2. In particular, at 1 AU, the (...)

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Kinetic-magnetic energy exchanges in rotating magnetohydrodynamic turbulence

Article dans Journal of Turbulence (2019)

Kinetic-magnetic energy exchanges in rotating magnetohydrodynamic turbulence

Fatma Salma Baklouti, Amor Khlifi, Abdelaziz Salhi, Fabien Godeferd, Claude Cambon, Thierry Lehner

We use direct numerical simulations to study the dynamics of incompressible homogeneous turbulence subjected to a uniform magnetic field B in a rotating frame with rotation vector (...)

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Control of light gas releases in ventilated tunnels

Article dans J. Fluid. Mech. (2019)

Control of light gas releases in ventilated tunnels

Lei Jiang, Mathieu Creyssels, Gary R. Hunt & Pietro Salizzoni

The release of buoyant harmful gases within enclosed spaces, such as tunnels and corridors, may engender specific health, industrial and transportation risks. For safety, a simple ventilation (...)

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Refinement of the logarithmic law of the wall

Article dans Phys. Rev. Fluids (2019)

Refinement of the logarithmic law of the wall

Faouzi Laadhari

Available direct numerical simulation of turbulent channel flow at moderately high Reynolds numbers data show that the logarithmic diagnostic function is a linearly decreasing function of the (...)

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