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 : 

ASTROFLU V

ERCOFTAC Workshop at École Centrale de Lyon

ASTROFLU V

Mardi 7 et mercredi 8 décembre 2021, ÉCL)

Les mardi 7 et mercredi 8 décembre 2021, est organisée sous l’égide du ERCOFTAC Centre Henri Bénard, avec SIG 35, SIG50 et SIG39, une réunion qui regroupera le workshop européen ASTROFLU-5 et le (...)

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Soutenance de thèse ECL

Smail Lebbal

Mardi 7 décembre 2021, 14h30, présentiel

Dynamique des écoulements pulsés dans des canaux déformables
Composition du jury
Frédéric Alizard, MCF HDR, LMFA, Directeur de thèse
Damien Biau, MCF Arts et Métiers, Paris, Examinateur
Christopher (...)

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Des calculs de mécanique des fluides cinq fois plus rapides

Communication scientifique

Des calculs de mécanique des fluides cinq fois plus rapides

Résultats mis en avant par le CNRS INSIS

Des chercheurs du LMFA (Jérôme Boudet et Emmanuel Lévêque), en collaboration avec la société CS-Group, ont utilisé la méthode Boltzmann sur réseau pour simuler le phénomène de décollement aérodynamique (...)

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Existence of positive skewness of velocity gradient in early transition

Article dans Phys. Rev. Fluids (2021)

Existence of positive skewness of velocity gradient in early transition

H. K. Zhao, Y. W. Liu, L. Shao, L. Fang & M. Dong

The present study uses direct numerical simulations to calculate two different transitional flows from laminar flow to turbulence, that is, the two-scale wake flow and the two-dimensional (...)

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Statistical mechanics of the Euler equations without vortex stretching

Article dans J. Fluid Mech. (2021)

Statistical mechanics of the Euler equations without vortex stretching

Tong Wu & Wouter Bos

We consider the relaxation to thermal equilibrium of the Galerkin-truncated Euler equations in three dimensions, from which vortex stretching is removed. We prove that helicity and enstrophy are (...)

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Unsteady lattice Boltzmann simulations of corner separation in a compressor cascade

Article dans J. Turbomachinery (2022)

Unsteady lattice Boltzmann simulations of corner separation in a compressor cascade

Jérôme Boudet, Emmanuel Lévêque & Hatem Touil

Lattice Boltzmann simulations of corner separation flow in a compressor cascade are presented. The lattice Boltzmann approach is rather new in the context of turbomachinery, and the configuration (...)

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Connecting large-scale velocity and temperature bursts with small-scale intermittency in stratified turbulence

Article dans Europhys. Lett. (2021)

Connecting large-scale velocity and temperature bursts with small-scale intermittency in stratified turbulence

F. Feraco, R. Marino, L. Primavera, A. Pumir, P. D. Mininni, D. Rosenberg, A. Pouquet, R. Foldes, E. Lévêque, E. Camporeale, S. S. Cerri, H. Charuvil Asokan, J. L. Chau, J.-P. Bertoglio, P. Salizzoni & M. Marro

Non-Gaussian statistics of large-scale fields are routinely observed in data from atmospheric and oceanic campaigns and global models. Recent direct numerical simulations (DNSs) showed that (...)

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Mesospheric gravity wave activity estimated via airglow imagery, multistatic meteor radar, and SABER data taken during the SIMONe–2018 campaign

Article dans Atmos. Chem. Phys. (2021)

Mesospheric gravity wave activity estimated via airglow imagery, multistatic meteor radar, and SABER data taken during the SIMONe–2018 campaign

Fabio Vargas, Jorge L. Chau, Harikrishnan Charuvil Asokan & Michael Gerding

We describe in this study the analysis of small and large horizontal-scale gravity waves from datasets composed of images from multiple mesospheric airglow emissions as well as multistatic (...)

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Optimal energy growth in pulsatile channel and pipe flows

Article dans J. Fluid Mech. (2021)

Optimal energy growth in pulsatile channel and pipe flows

Benoît Pier & Peter J. Schmid

Pulsatile channel and pipe flows constitute a fundamental flow configuration with significant bearing on many applications in the engineering and medical sciences. Rotating machinery, hydraulic (...)

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A priori analysis of subgrid-scale terms in compressible transcritical real gas flows

Article dans Phys. Fluids (2021)

A priori analysis of subgrid-scale terms in compressible transcritical real gas flows

Alexis Giauque, Aurélien Vadrot, Paolo Errante & Christophe Corre

Of interest to the research community dealing with real gas flows, this study analyzes the influence of the physical complexity of real gases on the amplitude of subgrid-scale (SGS) terms present (...)

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 Quasiperiodic fluctuations of von Kármán turbulence driven by viscous stirring

Article dans Phys. Rev. Fluids (2021)

Quasiperiodic fluctuations of von Kármán turbulence driven by viscous stirring

Ryo Araki & Susumu Goto

We numerically simulate the von Kármán swirling flow driven by viscous stirring with a pair of inversely rotating smooth disks at moderate Reynolds numbers well beyond the first Hopf bifurcation. (...)

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Radar observation of extreme vertical drafts in the polar summer mesosphere

Article dans Geophys. Res. Lett. (2021)

Radar observation of extreme vertical drafts in the polar summer mesosphere

J. L. Chau, R. Marino, F. Feraco, J. M. Urco, G. Baumgarten, F.-J. Lübken, W. K. Hocking, C. Schult, T. Renkwitz & R. Latteck

The polar summer mesosphere is the Earth’s coldest region, allowing the formation of mesospheric ice clouds. These ice clouds produce strong polar mesospheric summer echoes (PMSE) that are used as (...)

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 Effect of particle inertia on the alignment of small ice crystals in turbulent clouds

Article dans J. Atmos. Sci. (2021)

Effect of particle inertia on the alignment of small ice crystals in turbulent clouds

K. Gustavsson, M. Z. Sheikh, A. Naso, A. Pumir & B. Mehlig

Small nonspherical particles settling in a quiescent fluid tend to orient so that their broad side faces down because this is a stable fixed point of their angular dynamics at small particle (...)

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Energy balance and mixing between waves and eddies in stably stratified turbulence

Article dans J. Fluid Mech. (2021)

Energy balance and mixing between waves and eddies in stably stratified turbulence

Henri Lam, Alexandre Delache & Fabien Godeferd

We explore the strong stratification regime of stably stratified turbulence and the intermediate regime towards the viscosity-affected stratified state. Three-dimensional velocity-density fields (...)

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Primary instability of a visco-plastic film down an inclined plane : experimental study

Article dans J. Fluid Mech. (2021)

Primary instability of a visco-plastic film down an inclined plane : experimental study

D. Mounkaila Noma, S. Dagois-Bohy, S. Millet , V. Botton , D. Henry & H. Ben Hadid

We study experimentally the primary instability of a visco-plastic film flow down an inclined plane. The experimental set-up is a channel with a varying slope angle, in which a permanent flow of (...)

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Direct numerical simulations of temporal compressible mixing layers in a Bethe–Zel'dovich–Thompson dense gas : influence of the convective Mach number

Article dans J. Fluid Mech. (2021)

Direct numerical simulations of temporal compressible mixing layers in a Bethe–Zel’dovich–Thompson dense gas : influence of the convective Mach number

Aurélien Vadrot, Alexis Giauque & Christophe Corre

The present article investigates the effects of a BZT (Bethe–Zel’dovich–Thompson) dense gas (FC-70) on the development of turbulent compressible mixing layers at three different convective Mach (...)

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