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.


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Three-dimensional lattice Boltzmann model for acoustic waves emitted by a source

Article dans Int. J. Comput. Fluid Dyn. (2021)

Three-dimensional lattice Boltzmann model for acoustic waves emitted by a source

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

This paper implements the lattice Boltzmann method to simulate the propagation of sound waves in three dimensions. The numerical model is exercised on the lid-driven cavity flow. Tests are then (...)

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Vortex clustering, polarisation and circulation intermittency in classical and quantum turbulence

Article dans Nature Communications (2021)

Vortex clustering, polarisation and circulation intermittency in classical and quantum turbulence

Juan Ignacio Polanco, Nicolás P. Müller & Giorgio Krstulovic

The understanding of turbulent flows is one of the biggest current challenges in physics, as no first-principles theory exists to explain their observed spatio-temporal intermittency. Turbulent (...)

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Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage

Article dans Astronomy & Astrophysics (2021)

Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage

D. Telloni, C. Scolini, C. Möstl, G. P. Zank, L.-L. Zhao, A. J. Weiss, M. A. Reiss, R. Laker, D. Perrone, Y. Khotyaintsev, K. Steinvall, L. Sorriso-Valvo, T. S. Horbury, R. F. Wimmer-Schweingruber, R. Bruno, R. D’Amicis, R. De Marco, V. K. Jagarlamudi, F. Carbone, R. Marino, M. Stangalini, M. Nakanotani, L. Adhikari, H. Liang, L. D. Woodham, E. E. Davies, H. Hietala, S. Perri, R. Gómez-Herrero, J. Rodríguez-Pacheco, E. Antonucci, M. Romoli, S. Fineschi, M. Maksimovic, J. Souček, T. Chust, M. Kretzschmar, A. Vecchio, D. Müller, I. Zouganelis, R. M. Winslow, S. Giordano, S. Mancuso, R. Susino, S. L. Ivanovski, M. Messerotti, H. O’Brien, V. Evans and V. Angelini

Context. Solar Orbiter, the new-generation mission dedicated to solar and heliospheric exploration, was successfully launched on February 10, 2020, 04:03 UTC from Cape Canaveral. During its first (...)

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Two-dimensional numerical model of Marangoni surfers : From single swimmer to crystallization

Article dans Phys. Rev. E (2021)

Two-dimensional numerical model of Marangoni surfers : From single swimmer to crystallization

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

We numerically study the dynamics of an ensemble of Marangoni surfers in a two-dimensional and unconfined space. The swimmers are modeled as Gaussian sources of surfactant generating surface (...)

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Expected evolution of COVID-19 epidemic in France for several combinations of vaccination strategies and barrier measures

Article dans Vaccines (2021)

Expected evolution of COVID-19 epidemic in France for several combinations of vaccination strategies and barrier measures

S. Pageaud, C. Pothier, C. Rigotti, A. Eyraud-Loisel, J.-P. Bertoglio, A. Bienvenüe, N. Leboisne, N. Ponthus, R. Gauchon, F. Gueyffier, P. Vanhems, J. Iwaz, S. Loisel & P. Roy

The outbreak of the SARS-CoV-2 virus, enhanced by rapid spreads of variants, has caused a major international health crisis, with serious public health and economic consequences. An agent-based (...)

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Effect of shaping on turbulent dynamics in reversed-field pinch simulations

Article dans J. Plasma Phys. (2021)

Effect of shaping on turbulent dynamics in reversed-field pinch simulations

Robert Chahine, Kai Schneider & Wouter Bos

We study the influence of the shape of the plasma container on the dynamics of the reversed-field pinch (RFP). The geometries we consider are periodic cylinders with elliptical and (...)

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Impact of Switchbacks on Turbulent Cascade and Energy Transfer Rate in the Inner Heliosphere

Article dans The Astrophys. J. Lett. (2021)

Impact of Switchbacks on Turbulent Cascade and Energy Transfer Rate in the Inner Heliosphere

C. S. Hernández, L. Sorriso-Valvo, R. Bandyopadhyay, A. Chasapis, C. L. Vásconez, R. Marino & O. Pezzi

Recent Parker Solar Probe (PSP) observations of inner heliospheric plasma have shown an abundant presence of Alfvénic polarity reversal of the magnetic field, known as "switchbacks." While their (...)

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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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