Séminaire de Mécanique d'Orsay

Le Jeudi 10 décembre à 14h00 - Salle de conférences du LIMSI

Magnetic fluid-structure Dynamo

Yannick Ponty
Laboratoire J-L Lagrange (UMR 7293) Observatoire de la Cote d'Azur - Nice

We present a direct numerical simulation (DNS) version of the Von Karman flow, forced by two rotating impellers. The cylinder geometry and the rotating objects are modelled via a penalization method and implemented in a massive parallel pseudo-spectral Navier–Stokes solver. First, we present our hydrodynamic simulations and compare with a set of well documented water experiments. Secondly, we include the magnetic induction equation inside the fluid and solid system in order the study the dynamo effect. We will present several common features with the VKS dynamo experimental campaigns, as the observed magnetic mode (m=0) and the variation with the magnetic permeability. The magnetic and current behaviors near and inside the impellers will be detailled. Dynamic behaviors along the saturation regime will conclude this talk.