The team activities, rather fundamental, deal with hydrodynamic instabilities, transition to turbulence, turbulent flows and flows at small scale.
T&I news:
Article in J. Fluid Mech. (2024)
Waves and non-propagating modes in stratified MHD turbulence subject to a weak mean magnetic field
A. Salhi, A. Khlifi, R. Marino, F. Feraco, R. Foldes & C. Cambon
In this study we consider a freely decaying, stably stratified homogeneous magnetohydrodynamic turbulent plasma with a weak vertical background magnetic field (B$_0=B_0\,$z, aligned with the (...)
Article in Phys. Fluids (2024)
Waves and non-propagating mode in stratified and rotating magnetohydrodynamic turbulence
W. Mouhali, A. Salhi, T. Lehner & C. Cambon
In this study, we consider a freely decaying, stably stratified, and rotating homogeneous magneto-hydrodynamic (MHD) turbulent plasma with a vertical background magnetic field (...)
Article in J. Fluid Mech. (2024)
Wave turbulence in a rotating channel: numerical implementation and results
Aleksandr Eremin, Julian Scott, Fabien Godeferd & Anne Cadiou
The analysis of Scott (J. Fluid Mech., vol. 741, 2014, pp. 316–349) is implemented numerically. Decaying turbulence is confined to a channel between two infinite, parallel, rotating walls. The (...)
Article in J. Fluid Mech. (2024)
Rapidly rotating radiatively driven convection: experimental and numerical validation of the ‘geostrophic turbulence’ scaling predictions
Gabriel Hadjerci, Vincent Bouillaut , Benjamin Miquel & Basile Gallet
We experimentally and numerically characterize rapidly rotating radiatively driven thermal convection, beyond the sole heat transport measurements reported by Bouillaut et al. (Proc. Natl Acad. (...)
Article in Phys. Rev. Fluids (2024)
Influence of the vorticity-scalar correlation on mixing
Xi-Yuan Yin, Wesley Agoua, Tong Wu & Wouter J. T. Bos
Many factors influence the long-time behavior and mixing of a passive scalar field transported by a two-dimensional (2D) fluid flow. Our investigations based on statistical mechanics and (...)
Article in Phys. Rev. Fluids (2024)
Residence time distributions in unstable channel flow
Nelson Poumaëre, Benoît Pier & Florence Raynal
The transport properties of the plane Poiseuille flow in which a two-dimensional, nonlinearly saturated Tollmien-Schlichting wave is propagating are studied in terms of residence time (...)
Article in Phys. Rev. Fluids (2024)
Maximization of inertial waves focusing in linear and nonlinear regimes
A. Mohamed, A. Delache, F. S. Godeferd, J. Liu, M. Oberlack & Y. Wang
We study the propagation of inertial waves (IWs) generated by an axisymmetric torus oscillating at frequency $\omega_f$ in a rotating fluid. Inertial waves are emitted from the torus and (...)
Article in Atmosphere (2024)
Theory and modelling of isotropic turbulence: From Incompressible through increasingly compressible flows
Claude Cambon
Homogeneous isotropic turbulence (HIT) has been a useful theoretical concept for more than fifty years of theory, modelling, and calculations. Some exact results are revisited in incompressible (...)
Article in Comput. Fluids (2024)
An artificial compressibility approach to solve low Mach number flows in closed domains
A. Beccantini, C. Corre, S. Gounand & C.-H. Phan
An artificial compressibility approach is proposed to compute the solution of the compressible equations in the low Mach number limit, in closed domain with moving boundaries. The low Mach number (...)
Article in Phys. Rev. Lett. (2024)
Lagrangian irreversibility and energy exchanges in rotating-stratified turbulent flows
S. Gallon, A. Sozza, F. Feraco, R. Marino & A. Pumir
Turbulence in stratified and rotating turbulent flows is characterized by an interplay between waves and eddies, resulting in continuous exchanges between potential and kinetic energy. Here, we (...)
Article in Phys. Rev. Fluids (2024)
Helium plumes at moderate Reynolds number
Stefano Lanzini, Massimo Marro, Mathieu Creyssels, and Pietro Salizzoni
We present the first experimental study of the turbulent entrainment in non-Boussinesq steady plumes, focusing on moderate-Reynolds helium releases issued from an axisymmetric source. Our results (...)
Article in Phys. Rev. Fluids (2024)
Isotropic turbulence of variable-density incompressible flows
Loïc Reynier, Bastien Di Pierro & Frédéric Alizard
In the present study, the effects of density variations on structures developing in an isotropic incompressible turbulent flow are investigated. Statistical analyses are carried out on data sets (...)
Article in J. Atmos. Sci. (2024)
Effect of turbulence on the collision rate between settling ice crystals and droplets
Muhammad Z. Sheikh, Kristian Gustavsson, Emmanuel Lévêque, Bernard Mehlig, Alain Pumir & Aurore Naso
In mixed-phase clouds, graupel forms by riming, a process whereby ice crystals and supercooled water droplets settling through a turbulent flow collide and aggregate. We consider here the early (...)