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 : 

Transition from axisymmetric to three-dimensional turbulence

Article dans J. Turbulence (2021)

Transition from axisymmetric to three-dimensional turbulence

Zecong Qin, Aurore Naso & Wouter Bos

In purely axisymmetric turbulence sustained by a linear forcing mechanism, a stable, entirely poloidal flow is observed when the toroidal component of the forcing is below a threshold. We (...)

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Calculation of a key function in the asymptotic description of moving contact lines

Article dans Q. J. Mech. Appl. Math. (2020)

Calculation of a key function in the asymptotic description of moving contact lines

Julian Scott

An important element of the asymptotic description of flows having a moving liquid/gas interface which intersects a solid boundary is a function denoted $Q_i(\alpha)$ by Hocking and Rivers (The (...)

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Three-dimensional turbulence without vortex stretching

Article dans J. Fluid Mech. (2021)

Three-dimensional turbulence without vortex stretching

Wouter Bos

We consider three-dimensional turbulence from which vortex stretching is removed. The resulting system conserves enstrophy, but does not conserve kinetic energy. Using spectral closure, it is (...)

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Scalar mixing in homogeneous isotropic turbulence : A numerical study

Article dans Phys. Rev. Fluids (2021)

Scalar mixing in homogeneous isotropic turbulence : A numerical study

Michel Orsi, Lionel Soulhac, Fabio Feraco, Massimo Marro, Duane Rosenberg, Raffaele Marino, Maurizio Boffadossi & Pietro Salizzoni

The understanding of the mechanics of turbulent dispersion is of primary importance in estimating the effects of mixing processes involved in a variety of events playing a significant role in our (...)

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Acoustic streaming enhanced mass transfer at a wall

Article dans Int. J. Heat Mass Transf. (2021)

Acoustic streaming enhanced mass transfer at a wall

Nouhayla El Ghani, Sophie Miralles, Valéry Botton, Daniel Henry, Hamda Ben Hadid, Benoît Ter-Ovanessian & Sabrina Marcelin

The influence of an impinging acoustic streaming jet on wall mass transfer is studied both experimentally and numerically. The idea is to show that acoustically-driven jets generated by (...)

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Modeling the role of clusters and diffusion in the evolution of COVID-19 infections during lock-down

Article dans Comput. Mech. (2021)

Modeling the role of clusters and diffusion in the evolution of COVID-19 infections during lock-down

Wouter Bos, Jean-Pierre Bertoglio & Louis Gostiaux

The dynamics of the spread of epidemics, such as the recent outbreak of the SARS-CoV-2 virus, is highly nonlinear and therefore difficult to predict. As time evolves in the present pandemic, it (...)

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Mixing and unmixing induced by active camphor particles

Article dans Phys. Rev. Fluids (2021)

Mixing and unmixing induced by active camphor particles

Clément Gouiller, Florence Raynal, Laurent Maquet, Mickaël Bourgoin, Cécile Cottin-Bizonne, Romain Volk & Christophe Ybert

Small colloidal floaters are poured at the air-water interface of a tank stirred by many camphor swimmers. The system rapidly reaches a statistically stationary state resulting in the competition (...)

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Correlation between Buoyancy Flux, Dissipation and Potential Vorticity in Rotating Stratified Turbulence

Article dans Atmosphere (2021)

Correlation between Buoyancy Flux, Dissipation and Potential Vorticity in Rotating Stratified Turbulence

Duane Rosenberg, Annick Pouquet & Raffaele Marino

We study in this paper the correlation between the buoyancy flux, the efficiency of energy dissipation and the linear and nonlinear components of potential vorticity, PV, a point-wise invariant (...)

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Local and global properties of energy transfer in models of plasma turbulence

Article dans J. Plasma Phys. (2021)

Local and global properties of energy transfer in models of plasma turbulence

Christian L. Vásconez, D. Perrone, R. Marino, D. Laveder, F. Valentini, S. Servidio, P. Mininni & L. Sorriso-Valvo

The nature of the turbulent energy transfer rate is studied using direct numerical simulations of weakly collisional space plasmas. This is done comparing results obtained from hybrid (...)

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Deep-sea deployment of the KM3NeT neutrino telescope detection units by self-unrolling

Article dans Journal of Instrumentation (2020)

Deep-sea deployment of the KM3NeT neutrino telescope detection units by self-unrolling

S. Aiello, L. Gostiaux, H. Van Haren, et al.

KM3NeT is a research infrastructure being installed in the deep Mediterranean Sea. It will house a neutrino telescope comprising hundreds of networked moorings—detection units or strings—equipped (...)

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