Partenaires

CNRS Universite Grenoble Alpes UPS LaNEF INSA TOULOUSE EMFL NEXT

Accueil


Accueil du site > Evènements du laboratoire > Séminaires > Archives - Séminaires 2014 > Experimental study of the dynamics of magnetohydrodynamic (MHD) turbulence

English

Experimental study of the dynamics of magnetohydrodynamic (MHD) turbulence

21/01/2014, Nathaniel Baker (Coventry University& CRETA-LNCMI)

Turbulent flows feature radically different dynamics whether they are two-dimensional or three-dimensional : 3D turbulence features a direct energy cascade from large scales to smaller ones, whereas 2D turbulence features an inverse energy cascade from small scales to larger ones. Both types of turbulence are becoming more and more understood separately, however the mechanisms occurring during transitional regimes are still to be determined.
The goal of this PhD project is to capture experimentally the mechanisms that drive a turbulent flow towards such and such dynamics. In order to do so, we study an electrically driven MHD turbulence. One of the main features of MHD flows is the action of the Lorentz force, which tends to bring the flow towards a 2D state. It is therefore possible to control at will the flow configuration (fully 3D, quasi-2D or intermediary) by setting the magnitude of the Lorentz force, hence giving us access to a very wide range of flow regimes.