Fluid Mechanics and Acoustics Laboratory - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique
Lyon
France


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Home > Teams > Turbulence & Instabilities

Turbulence & Instabilities

Head: Florence Raynal

The team activities, rather fundamental, deal with hydrodynamic instabilities, transition to turbulence, turbulent flows and flows at small scale.


 T&I news: 

Virgile Tavernier

PhD defense INSA

Virgile Tavernier

Mercredi 19 décembre 2018 à 9h30 à l’INSA Lyon, en salle René Char (Bâtiment "La Rotonde)

Modélisation numérique de la solidification et de la ségrégation des impuretés lors de la croissance du silicium photovoltaïque à l’aide d’une méthode originale de maillage glissant
Les panneaux (...)

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The size and lifetime of organised eddies in a non-solid-body rotating turbulence experiment

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

The size and lifetime of organised eddies in a non-solid-body rotating turbulence experiment

Lian Gan & Andrea Maffioli

This paper follows our previous study of forced non-solid-body rotating turbulence and summarises results on the eddy size and lifetime in the same flow. The experiment is conducted in a (...)

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A new strategy for the numerical modeling of a weld pool

Article in Comptes Rendus Mécanique (2018)

A new strategy for the numerical modeling of a weld pool

Yassine Saadlaoui, Éric Feulvarch, Alexandre Delache, Jean-Baptiste Leblond & Jean-Michel Bergheau

Welding processes involve high temperatures and metallurgical and mechanical consequences that must be controlled. For this purpose, numerical simulations have been developed to study the effects (...)

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Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number

Article in Europhys. Lett. (2018)

Vertical drafts and mixing in stratified turbulence: Sharp transition with Froude number

Fabio Feraco, Raffaele Marino, Alain Pumir, Leonardo Primavera, Pablo D. Mininni, Annick Pouquet & Duane Rosenberg

We investigate the large-scale intermittency of vertical velocity and temperature, and the mixing properties of stably stratified turbulent flows using both Lagrangian and Eulerian fields from (...)

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Three-dimensional instability of a flow past a sphere: Mach evolution of the regular and Hopf bifurcations

Article in J. Fluid Mech. (2018)

Three-dimensional instability of a flow past a sphere: Mach evolution of the regular and Hopf bifurcations

Andrea Sansica, Jean-Christophe Robinet, Frédéric Alizard & Éric Goncalvès

A fully three-dimensional linear stability analysis is carried out to investigate the unstable bifurcations of a compressible viscous fluid past a sphere. A time-stepper technique is used to (...)

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A flow-pattern map for phase separation using the Navier–Stokes–Cahn–Hilliard model

Article in Eur. J. Mech. B-Fluids (2018)

A flow-pattern map for phase separation using the Navier–Stokes–Cahn–Hilliard model

Aurore Naso & Lennon Ó Náraigh

We use the Navier–Stokes–Cahn–Hilliard model equations to simulate phase separation with flow. We study coarsening — the growth of extended domains wherein the binary mixture phase separates into its (...)

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Spectral energy scaling in precessing turbulence

Article in Phys. Rev. E (2018)

Spectral energy scaling in precessing turbulence

A. Khlifi, A. Salhi, S. Nasraoui, F. Godeferd & C. Cambon

We study precessing turbulence, which appears in several geophysical and astrophysical systems, by direct numerical simulations of homogeneous turbulence where precessional instability is (...)

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Numerical analysis of the flapping mechanism for a two-phase coaxial jet

Article in Int. J. Multiph. Flow (2018)

Numerical analysis of the flapping mechanism for a two-phase coaxial jet

Nicolas Odier, Guillaume Balarac & Christophe Corre

A numerical study of a coaxial liquid jet sheared by an annular high-speed stream is performed at moderate density and velocity ratio between phases. The destabilization mechanism of the jet is (...)

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Turbulence and turbulent pattern formation in a minimal model for active fluids

Article in Phys. Rev. Fluids (2018)

Turbulence and turbulent pattern formation in a minimal model for active fluids

Martin James, Wouter J. T. Bos, and Michael Wilczek

Active matter systems display a fascinating range of dynamical states, including stationary patterns and turbulent phases. While the former can be tackled with methods from the field of pattern (...)

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 Effects of Discrete Energy and Helicity Conservation in Numerical Simulations of Helical Turbulence

Article in Flow Turbul. Combust. (2018)

Effects of Discrete Energy and Helicity Conservation in Numerical Simulations of Helical Turbulence

Francesco Capuano & Donato Vallefuoco

Helicity is the scalar product between velocity and vorticity and, just like energy, its integral is an inviscid invariant of the three-dimensional incompressible Navier-Stokes equations. (...)

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Advanced spectral anisotropic modelling for shear flows

Article in J. Turbul. (2018)

Advanced spectral anisotropic modelling for shear flows

Antoine Briard, T Gomez & Claude Cambon

In this work, the spectral modelling developed in MCS (Mons, Cambon, Sagaut. J Fluid Mech. 2016) for shear-driven turbulence is further analysed and then improved. First, using self-similarity (...)

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