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 : 

Enseignement innovant : Marc Buffat au journal de 20h de France 2

Enseignement innovant : Marc Buffat au journal de 20h de France 2

mercredi 9 septembre 2020

France 3 Rhône-Alpes est venu filmer un cours de mécanique donné par Marc Buffat dans la salle René Michel du bâtiment Oméga de Lyon 1 pour illustrer les méthodes d’enseignement innovantes déployées par (...)

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Wouter Bos raconte ITER à RCF

Wouter Bos raconte ITER à RCF

15 septembre 2020

Wouter Bos a été interviewé par la radio lyonnaise RCF pour parler du projet ITER, International Thermonuclear Experimental Reactor. Ce programme a l’ambition de construire le plus grand tokamak (...)

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Posters doctorants 2A

Posters doctorants 2A

Nos étudiants doctorants en 2ème année ont réalisé des posters didactiques pendant le confinement. Les consignes et le modèle sont donnés ici. À défaut de pouvoir les accrocher sur les murs du labo pour (...)

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Linearly forced isotropic turbulence at low Reynolds numbers

Article dans Phys. Rev. E (2020)

Linearly forced isotropic turbulence at low Reynolds numbers

Wouter Bos, Faouzi Laadhari & Wesley Agoua

The forcing strength needed to sustain a flow using linear forcing is investigated. A critical Reynolds number $R_c$ is determined, based on the longest wavelength allowed by the system, the (...)

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Model for classical and ultimate regimes of radiatively driven turbulent convection

Article dans J. Fluid Mech. (2020)

Model for classical and ultimate regimes of radiatively driven turbulent convection

Mathieu Creyssels

In a standard Rayleigh–Bénard experiment, a layer of fluid is confined between two horizontal plates and the convection regime is controlled by the temperature difference between the hot lower (...)

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Numerical study of natural convection and acoustic waves using the lattice Boltzmann method

Article dans Heat Transfer (2020)

Numerical study of natural convection and acoustic waves using the lattice Boltzmann method

Jaouad Benhamou, Mohammed Jami, Ahmed Mezrhab, Valéry Botton & Daniel Henry

In this paper, the lattice Boltzmann method is used to study the acoustic waves propagation inside a differentially heated square enclosure filled with air. The waves are generated by a point (...)

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Reducing the background anisotropy by using hexagonal Fourier transform in two-dimensional turbulent flows

Article dans Computers & Fluids (2020)

Reducing the background anisotropy by using hexagonal Fourier transform in two-dimensional turbulent flows

J. Chai, Le Fang & Jean-Pierre Bertoglio

The two-dimensional hexagonal Fourier transform is introduced to reduce the background anisotropy in the numerical calculations with periodic conditions. Comparing to traditional Fourier (...)

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In situ analysis and visualization of massively parallel simulations of transitional and turbulent flows

Article dans J. of Physics : Conf. Series (2020)

In situ analysis and visualization of massively parallel simulations of transitional and turbulent flows

Anne Cadiou, Marc Buffat, Christophe Pera, Bastien Di Pierro, Frédéric Alizard & Lionel Le Penven

The increase of computational resources with the generalization of massively parallel supercomputers benefits to various fields of physics among which turbulence and fluid mechanics, making it (...)

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Mixing of non-Newtonian inelastic fluid in a turbulent patch of T-junction

Article dans J. Non-Newtonian Fluid Mech. (2020)

Mixing of non-Newtonian inelastic fluid in a turbulent patch of T-junction

Haining Luo, Alexandre Delache & Serge Simoëns

In this paper, we present result from a direct numerical simulation (DNS) of turbulent flow in a converging T-junction for both Newtonian (water) and non-Newtonian inelastic fluid (dilute Xanthan (...)

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 Kolmogorovian active turbulence of a sparse assembly of interacting Marangoni surfers

Article dans Phys. Rev. X (2020)

Kolmogorovian active turbulence of a sparse assembly of interacting Marangoni surfers

Mickaël Bourgoin, Ronan Kervil, Cécile Cottin-Bizonne, Florence Raynal, Romain Volk & Christophe Ybert

Active matter, composed of self-propelled entities, forms a wide class of out-of-equilibrium systems that display striking collective behaviors, among which, the so-called active turbulence where (...)

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Transition from non-swirling to swirling axisymmetric turbulence

Article dans Phys. Rev. Fluids (2020)

Transition from non-swirling to swirling axisymmetric turbulence

Zecong Qin, Hugues Faller, Bérengère Dubrulle, Aurore Naso & Wouter Bos

Strictly axisymmetric turbulence, i.e., turbulence governed by the Navier-Stokes equations modified such that the flow is invariant in the azimuthal direction, is a system intermediate between (...)

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Single-particle Lagrangian statistics from direct numerical simulations of rotating-stratified turbulence

Article dans Phys. Rev. Fluids (2020)

Single-particle Lagrangian statistics from direct numerical simulations of rotating-stratified turbulence

Dhawal Buaria, Alain Pumir, Fabio Feraco, Raffaele Marino, Annick Pouquet, Duane Rosenberg & Leonardo Primavera

Geophysical fluid flows are predominantly turbulent and often strongly affected by the Earth’s rotation, as well as by stable density stratification. Using direct numerical simulations of forced (...)

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Numerical study of extreme mechanical force exerted by a turbulent flow on a bluff body by direct and rare-event sampling techniques

Article dans J. Fluid Mech. (2020)

Numerical study of extreme mechanical force exerted by a turbulent flow on a bluff body by direct and rare-event sampling techniques

Thibault Lestang, Freddy Bouchet & Emmanuel Lévêque

This study investigates, by means of numerical simulations, extreme mechanical force exerted by a turbulent flow impinging on a bluff body, and examines the relevance of two distinct rare-event (...)

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Partitioning Waves and Eddies in Stably Stratified Turbulence

Article dans Atmosphere (2020)

Partitioning Waves and Eddies in Stably Stratified Turbulence

Henri Lam, Alexandre Delache & Fabien Godeferd

We consider the separation of motion related to internal gravity waves and eddy dynamics in stably stratified flows obtained by direct numerical simulations. The waves’ dispersion relation links (...)

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Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation

Article dans J. Fluid Mech. (2020)

Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation

Aurélien Vadrot, Alexis Giauque & Christophe Corre

This study investigates the effects of a Bethe–Zel’dovich–Thompson (BZT) dense gas (FC-70) on the development of a turbulent compressible mixing layer at a convective Mach number $M_c=1.1$. (...)

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