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 :
Communication scientifique
Des nageurs bien turbulents
Résultats mis en avant par l’American Physical Society
Pourrait-il y avoir un lien entre le comportement collectif d’entités capables de se déplacer de façon autonome (bactéries, animaux, foules, etc.) et la turbulence hydrodynamique ? Des chercheurs de (...)
Posters doctorants 2A
Nos étudiants doctorants en 2ème année ont réalisé des posters didactiques pendant le confinement. Les consignes et le modèle sont donnés ici.
À défaut de pouvoir les accrocher sur les murs du labo pour (...)
Article dans Phys. Rev. Fluids (2020)
Transition from non-swirling to swirling axisymmetric turbulence
Zecong Qin, Hugues Faller, Bérengère Dubrulle, Aurore Naso & Wouter Bos
Strictly axisymmetric turbulence, i.e., turbulence governed by the Navier-Stokes equations modified such that the flow is invariant in the azimuthal direction, is a system intermediate between (...)
Article dans Phys. Rev. Fluids (2020)
Single-particle Lagrangian statistics from direct numerical simulations of rotating-stratified turbulence
Dhawal Buaria, Alain Pumir, Fabio Feraco, Raffaele Marino, Annick Pouquet, Duane Rosenberg & Leonardo Primavera
Geophysical fluid flows are predominantly turbulent and often strongly affected by the Earth’s rotation, as well as by stable density stratification. Using direct numerical simulations of forced (...)
Article dans J. Fluid. Mech. (2020)
Numerical study of extreme mechanical force exerted by a turbulent flow on a bluff body by direct and rare-event sampling techniques
Thibault Lestang, Freddy Bouchet & Emmanuel Lévêque
This study investigates, by means of numerical simulations, extreme mechanical force exerted by a turbulent flow impinging on a bluff body, and examines the relevance of two distinct rare-event (...)
Article dans Atmosphere (2020)
Partitioning Waves and Eddies in Stably Stratified Turbulence
Henri Lam, Alexandre Delache & Fabien Godeferd
We consider the separation of motion related to internal gravity waves and eddy dynamics in stably stratified flows obtained by direct numerical simulations. The waves’ dispersion relation links (...)
Article dans J. Fluid. Mech. (2020)
Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation
Aurélien Vadrot, Alexis Giauque & Christophe Corre
This study investigates the effects of a Bethe–Zel’dovich–Thompson (BZT) dense gas (FC-70) on the development of a turbulent compressible mixing layer at a convective Mach number $M_c=1.1$. (...)
Article dans Journal of Turbulence (2020)
Staircase scaling of short-time energy transfer in turbulence
Le Fang, T. Wu & Wouter Bos
It is illustrated that a sharply truncated initial kinetic energy spectrum evolves to a staircase-shaped spectrum at short times. This effect is directly associated with the triadic nature of the (...)
Article dans Phys. Rev. E (2020)
Efficiency of laminar and turbulent mixing in wall-bounded flows
Benjamin Kadoch, Wouter Bos & Kai Schneider
A turbulent flow mixes in general more rapidly a passive scalar than a laminar flow does. From an energetic point of view, for statistically homogeneous or periodic flows, the laminar regime is (...)
Article dans Phys. Rev. Fluids (2020)
Scaling laws in axisymmetric magnetohydrodynamic duct flows
Alexandre Poyé, Olivier Agullo, Nicolas Plihon, Wouter Bos, Victor Desangles & Guillaume Bousselin
We report on a numerical study of axisymmetric flow of liquid metal in a circular duct with a rectangular cross section. The flow is forced through the combination of an axial magnetic field and (...)
Article dans Journal of Turbulence (2020)
Direct numerical simulations of forced homogeneous isotropic turbulence in a dense gas
Alexis Giauque, Christophe Corre & Aurélien Vadrot
Direct Numerical Simulations (DNS) of forced homogeneous isotropic turbulence in a dense gas (FC-70), accurately described by a complex EoS, are computed for a turbulent Mach number of 0.8. In a (...)
Article dans Atmosphere (2020)
Nonlinear Effects on the Precessional Instability in Magnetized Turbulence
Abdelaziz Salhi, Amor Khlifi & Claude Cambon
By means of direct numerical simulations (DNS), we study the impact of an imposed uniform magnetic field on precessing magnetohydrodynamic homogeneous turbulence with a unit magnetic Prandtl (...)
Article dans J. Fluid. Mech. (2020)
Importance of fluid inertia for the orientation of spheroids settling in turbulent flow
Muhammad Zubair Sheikh, Kristian Gustavsson, Diego Lopez, Emmanuel Lévêque, Bernhard Mehlig, Alain Pumir & Aurore Naso
How non-spherical particles orient as they settle in a flow has important practical implications in a number of scientific and engineering problems. In a quiescent fluid, a slowly settling (...)