Session ME - Turbulence Simulations V.
MIXED session, Tuesday afternoon, November 23
Cascade I, Westin Seattle
Conductive flows in wall-bounded geometries under the influence of a strong applied external magnetic field are encountered in many industrial applications such as steel casting and coolant blankets in nuclear fusion devices (tokamaks). These flows are characterized by the development of very thin Hartmann layers on the walls perpendicular to the magnetic field and a strong tendency towards bi-dimensionalization of the core flow. To study the dynamics of such flows, we perform a set of numerical simulations in a cubic periodic domain. The effect of the Hartmann layers is modelled by adding to the traditional Joule dissipation some extra damping terms derived from the dominant time scales of the flow and MHD. Using this model, this simplified geometry allows the investigation of the 2D nature of the core flow. The formalism of Large Eddy Simulation is then applied to a more realistic geometry to reproduce a MATUR cell in which the flow is contained in a (flat) cylindrical container and rotationally driven by an imposed electrical current. In this case, the Hartmann layers are explicitly simulated.