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 :
Projet Inter-Carnot ASTRES + Awinsi
Une baguette magique pour mélanger le silicium fondu... sans baguette !
Valéry Botton & Sophie Miralles
Mélanger dans un four de solidification de silicium photovoltaïque, donc dans un milieu opaque, à très haute température (environ 1400°C), sans le "polluer" ? C’est possible ! Avec des chercheurs du (...)
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 (...)
Article dans J. Fluid Mech. (2019)
Bifurcations from steady to quasi-periodic flows in a laterally heated cavity filled with low Prandtl number fluids
Abdessamed Medelfef, Daniel Henry, Ahcene Bouabdallah & Slim Kaddeche
This study deals with the transition toward quasi-periodicity of buoyant convection generated by a horizontal temperature gradient in a three-dimensional parallelepipedic cavity with dimensions (...)
Article dans Phys. Fluids (2019)
Instabilities in viscosity-stratified two-fluid channel flow over an anisotropic-inhomogeneous porous bottom
Geetanjali Chattopadhyay, Usha Ranganathan & Séverine Millet
A linear stability analysis of a pressure driven, incompressible, fully developed laminar Poiseuille flow of immiscible two-fluids of stratified viscosity and density in a horizontal channel (...)
Article dans 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 (...)
Article dans 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 (...)
Article dans 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 (...)
Article dans 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 (...)
Article dans 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 (...)
Article dans 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 (...)
Article dans 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 (...)
Article dans 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 (...)