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 : 

Construction d'un attracteur à partir d'un champ de vitesse numérique

Construction d’un attracteur à partir d’un champ de vitesse numérique

Gaby Launay, Tristan Cambonie, Daniel Henry, Alban Pothérat & Valéry Botton

À partir de simulations numériques de Daniel Henry (écoulement généré par acoustic streaming dans une cavité parallélépipédique), Gaby Launay a créé cette très belle animation, qui montre la construction (...)

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Le LMFA en couverture du journal "Physical Review Letters"

Le LMFA en couverture du journal "Physical Review Letters"

Les simulations numériques de Wouter Bos, chargé de recherches au LMFA, ont servi d’illustration à la couverture de la revue de l’APS "Physical Review Letters" de mars 2019.
Caption : Power input of (...)

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Harmonic to subharmonic transition of the Faraday instability in miscible fluids

Article dans Phys. Rev. Fluids (2019)

Harmonic to subharmonic transition of the Faraday instability in miscible fluids

Antoine Briard, Benoît-Joseph Gréa & Louis Gostiaux

When a stable stratification between two miscible fluids is excited by a vertical and periodic forcing, a turbulent mixing zone can develop, triggered by the Faraday instability. The mixing zone (...)

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Transition to chaos in an acoustically driven cavity flow

Article dans Phys. Rev. Fluids (2019)

Transition to chaos in an acoustically driven cavity flow

Gaby Launay, Tristan Cambonie, Daniel Henry, Alban Pothérat & Valéry Botton

We consider the unsteady regimes of an acoustically driven jet that forces a recirculating flow through successive reflections on the walls of a square cavity. The specific questions addressed (...)

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Power fluctuations in turbulence

Article dans Phys. Rev. letters (2019)

Power fluctuations in turbulence

Wouter J. T. Bos & Rémi Zamansky

To generate or maintain a turbulent flow, one needs to introduce kinetic energy. This energy injection necessarily fluctuates and these power fluctuations act on all turbulent excited length (...)

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The mechanism of long-wave instability in a shear-thinning film flow on a porous substrate

Article dans Acta Mechanica (2019)

The mechanism of long-wave instability in a shear-thinning film flow on a porous substrate

Séverine Millet, Ranganathan Usha, Valéry Botton & François Rousset

A linear stability analysis of a thin shear-thinning film with a deformable top surface flowing down an inclined porous substrate modelled as a smooth substrate with velocity slip at the wall is (...)

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A 2D½ model for natural convection and solidification in a narrow enclosure

Article dans Int. J. Therm. Sci. (2019)

A 2D½ model for natural convection and solidification in a narrow enclosure

I. Hamzaoui, S. Millet, V. Botton, A. Benzaoui, D. Henry, L. Hachani, R. Boussaa, K. Zaidat & Y. Fautrelle

Efficient numerical models are derived for problems of natural convection and material solidification in a horizontal differentially heated slender cavity. These 2D$^1/2$ models are obtained by (...)

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An improved multiscale Eulerian–Lagrangian method for simulation of atomization process

Article dans Comput. Fluids (2018)

An improved multiscale Eulerian–Lagrangian method for simulation of atomization process

Davide Zuzio, Jean-Luc Estivalèzes & Bastien Di Pierro

The physics of atomization process involve many spatial scales, generating a wide variety of liquid inclusions of different sizes with large density and viscosity ratios between liquid and gas (...)

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 Investigation of the dynamics in separated turbulent flow

Article dans Eur. J. Mech. B-Fluids (2019)

Investigation of the dynamics in separated turbulent flow

Fawzi Fadla, Frédéric Alizard, Laurent Keirsbulck, Jean-Christophe Robinet, Jean-PhilippeLaval, Jean-Marc Foucaut, Camila Chovet & Marc Lippert

Dynamical behavior of the turbulent channel flow separation induced by a wall-mounted two-dimensional bump is studied, with an emphasis on unsteadiness characteristics of vortical motions (...)

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Nonlinear spectral model for rotating sheared turbulence

Article dans J. Fluid Mech. (2019)

Nonlinear spectral model for rotating sheared turbulence

Ying Zhu, Claude Cambon, Fabien. Godeferd & Aziz Salhi

We propose a statistical model for homogeneous turbulence undergoing distortions, which improves and extends the MCS model by Mons, Cambon & Sagaut (2016). The spectral tensor of two-point (...)

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Multiscale analysis of the structure of homogeneous rotating turbulence

Article dans Phys. Rev. Fluids (2019)

Multiscale analysis of the structure of homogeneous rotating turbulence

Aurore Naso

The structure of homogeneous rotating turbulence at moderate Reynolds number is investigated by analyzing the instantaneous statistics of the scale-dependent velocity gradient tensor perceived by (...)

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Helicity dynamics, inverse, and bidirectional cascades in fluid and magnetohydrodynamic turbulence : a brief review

Article dans Earth Space Sci. (2019)

Helicity dynamics, inverse, and bidirectional cascades in fluid and magnetohydrodynamic turbulence : a brief review

A. Pouquet, D. Rosenberg, J.E. Stawarz & R. Marino

We briefly review helicity dynamics, inverse and bidirectional cascades in fluid and magnetohydrodynamic (MHD) turbulence, with an emphasis on the latter. The energy of a turbulent system, an (...)

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Restricted nonlinear model for high- and low-drag events in plane channel flow

Article dans J. Fluid Mech. (2019)

Restricted nonlinear model for high- and low-drag events in plane channel flow

Frédéric Alizard & Damien Biau

A restricted nonlinear (RNL) model, obtained by partitioning the state variables into streamwise-averaged quantities and superimposed perturbations, is used in order to track the exact coherent (...)

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