-
Weak turbulence in two-dimensional magnetohydrodynamics
A weak wave turbulence theory is developed for two-dimensional (2D) magnetohydrodynamics (MHD). We derive and analyze the kinetic equation describing the three-wave... -
Modeling of the action of a variable magnetic field on a molten metal laid ou...
The action of an AC magnetic field on a thin liquid metal layer is studied in an experimental and theoretical way. In the first chapter, the experimental bench is... -
Collapse and fragmentation of prestellar dense cores: study of protostellar d...
Stars play a central role in modern astrophysics. To understand how stars form is therefore fundamental for the field. Stars form in gas clouds in the interstellar... -
Study and effective models of quasi-2D flows
Confined flows under a strong vertical magnetic field and rotating flows have in common at least two striking features : first, far from walls, the velocity field is... -
Instabilities in magnetohydrodynamics
The magnetohydrodynamics, or dynamo effect, involves the generation of electrical energy from mechanical energy. More specifically, it consists in studying the... -
Experimental studies of the dynamo instability : generation and saturation me...
This PhD thesis deals with several problems relative to the dynamo instability in liquid metals turbulent flows. This instability converts kinetic energy into magnetic... -
Effects on the free surface of a turbulent flow
We study surface manifestations of a turbulent flow from an experimental point of view. Specifically we study a turbulent flow in a thin layer of fluid (a liquid... -
Non-ideal magnetohydrodynamics in low-mass star formation
Stars formation occurs in several steps. First a large scale phase during which the molecular cloud undergo fragmentation due to its self-gravity and turbulence. In... -
Theoretical and experimental studies of arcs in a three phase plasma torch co...
Arc plasma torches are widely used in industrial applications. A 3-phase AC plasma technology with consumable graphite electrodes is under development at PERSEE MINES... -
Magnétohydrodynamique confinée appliquée aux plasmas de fusion magnétiques
A magnetohydrodynamic description is used to study magnetic fusion plasmas in two different configurations: tokamak and reversed field pinch. A Fourier pseudo-spectral...
