82 citations · 627 across the 32 of their papers we have counts for
26 papers · 1 filter
Experimental evidence of Kelvin wave turbulence along a vortex core
Jason Barckicke, Christophe Gissinger, Eric Falcon
Wave turbulence is a regime of interacting nonlinear waves occurring in most physical systems. Kelvin waves are helical distortions that propagate along vortex filaments and are be…
Magnetic reversals in a geodynamo model with a stably-stratified layer
Nicolás Pablo Müller, Christophe Gissinger, François Pétrélis
We study the process of magnetic reversals in the presence of a stably-stratified layer below the core-mantle boundary using direct numerical simulations of the incompressible magn…
Thermoelectricity at a gallium-mercury liquid metal interface
Marlone Vernet, Stephan Fauve, Christophe Gissinger
We present experimental evidence of a thermoelectric effect at the interface between two liquid metals. Using superimposed layers of mercury and gallium in a cylindrical vessel ope…
Subcritical transition to turbulence triggered by a magnetic dynamo
Florentin Daniel, Ludovic Petitdemange, Christophe Gissinger
It has recently been shown that a significant slowdown of many stars can be attributed to the emergence of a strong magnetic field within the radiative region, where heat is transf…
Angular Momentum Transport by Keplerian Turbulence in Liquid Metals
Marlone Vernet, Stephan Fauve, Christophe Gissinger
We report a laboratory study of the transport of angular momentum by a turbulent flow of an electrically conducting fluid confined in a thin disk. When the electromagnetic force ap…
Enhanced dynamo growth in nonhomogeneous conducting fluids
Florence Marcotte, Basile Gallet, Francois Pétrélis +1
We address magnetic-field generation by dynamo action in systems with inhomogeneous electrical conductivity and magnetic permeability. More specifically, we first show that the Tay…
Turbulence in electromagnetically-driven Keplerian flows
Marlone Vernet, Michael Pereira, Stephan Fauve +1
The flow of an electrically conducting fluid in a thin disc under the action of an azimuthal Lorentz force is studied experimentally. At small forcing, the Lorentz force is balance…
Capillary wave turbulence experiments in microgravity
Michael Berhanu, Eric Falcon, Guillaume Michel +2
Using the FLUIDICS (Fluid Dynamics in Space) experiment in the International Space Station, turbulence of capillary waves at the air-water interface is experimentally investigated…
Nonaxisymmetric instabilities in turbulent electromagnetic pumps
Paola Rodriguez Imazio, Christophe Gissinger
The stability of annular electromagnetic pumps (EMPs) is investigated through 3D direct numerical simulations. When induction effects dominate dissipative processes, linear inducti…
1/f noise and long-term memory of coherent structures in a turbulent shear flow
Michael Pereira, Christophe Gissinger, Stephan Fauve
A shear flow of liquid metal (Galinstan) is driven in an annular channel by counter-rotating traveling magnetic fields imposed at the endcaps. When the traveling velocities are lar…
Instabilities of MHD flows driven by traveling magnetic fields
Sandeep R. Kanuganti, Stephan Fauve, Christophe Gissinger
The flow of an electrically conducting fluid driven by a traveling magnetic field imposed at the endcaps of a cylindrical annulus is numerically studied. At sufficiently large magn…
Dynamo generated by the centrifugal instability
Florence Marcotte, Christophe Gissinger
We present a new scenario for magnetic field amplification where an electrically conducting fluid is confined in a differentially rotating, spherical shell with thin aspect-ratio.…
Fluctuations of electrical conductivity: a new source for astrophysical magnetic fields
Francois Petrelis, Alexandros Alexakis, Christophe Gissinger
We consider the generation of magnetic field by the flow of a fluid for which the electrical conductivity is nonuniform. A new amplification mechanism is found which leads to dynam…
Instability in electromagnetically driven flows Part II
Paola Rodriguez Imazio, Christophe Gissinger
In a previous paper, we have reported numerical simulations of the MHD flow driven by a travelling magnetic field (TMF) in an annular channel, at low Reynolds number. It was shown…
Instability in electromagnetically driven flows Part I
Christophe Gissinger, Paola Rodriguez-Imazio, Stephan Fauve
The MHD flow driven by a travelling magnetic field (TMF) in an annular channel is investigated numerically. For sufficiently large magnetic Reynolds number Rm, or if a large enough…
Dynamo regimes and transitions in the VKS experiment
M. Berhanu, G. Verhille, J. Boisson +14
The Von K{á}rm{á}n Sodium experiment yields a variety of dynamo regimes, when asymmetry is imparted to the flow by rotating impellers at different speed F1 and F2. We show that as…
Energy Fluxes during Dynamo Reversals
Pankaj Mishra, Christophe Gissinger, Emmanuel Dormy +1
Using direct numerical simulations of the equations of magnetohydrodynamics, we study reversals of the magnetic field generated by the flow of an electrically conducting fluid in a…
Observation of a Free-Shercliff-Layer Instability in Cylindrical Geometry
Austin Roach, Erik Spence, Christophe Gissinger +4
We report on observations of a free-Shercliff-layer instability in a Taylor-Couette experiment using a liquid metal over a wide range of Reynolds numbers, . The f…
Bistability between equatorial and axial dipoles during magnetic field reversals
Christophe Gissinger, Ludovic Petitdemange, Martin Schrinner +1
Numerical simulations of the geodynamo in presence of an heterogeneous heating are presented. We study the dynamics and the structure of the magnetic field when the equatorial symm…
The role of boundaries in the MagnetoRotational Instability
Christophe Gissinger, Jeremy Goodman, Hantao Ji
In this paper, we investigate numerically the flow of an electrically conducting fluid in a cylindrical Taylor-Couette flow when an axial magnetic field is applied. To minimize Ekm…
Instabilities in magnetized spherical Couette flow
Christophe Gissinger, Hantao Ji, Jeremy Goodman
We report 3D numerical simulations of the flow of an electrically conducting fluid in a spherical shell when a magnetic field is applied. Different spherical Couette configurations…
Dipole-Quadrupole dynamics during magnetic field reversals
Christophe Gissinger
The shape and the dynamics of reversals of the magnetic field in a turbulent dynamo experiment are investigated. We report the evolution of the dipolar and the quadrupolar parts of…
A numerical model of the VKS experiment
Christophe Gissinger
We present numerical simulations of the magnetic field generated by the flow of liquid sodium driven by two counter-rotating impellers (VKS experiment). Using a dynamo kinematic co…
Chaotic magnetic field reversals in turbulent dynamos
Christophe Gissinger, Emmanuel Dormy, Stephan Fauve
We present direct numerical simulations of reversals of the magnetic field generated by swirling flows in a spherical domain. In agreement with a recent model, we observe that coup…