The Dresdyn Precession Dynamo Experiment

In the most ambitious experiment of DRESDYN (DREsden Sodium facility
for DYNnamo and thermohydraulic studies) a fluid flow of liquid sodium, solely driven
by precession, will be considered as a possible source for magnetic field generation. Here,
after the description of the experimental facility, we are going to present the results (in
particular the hydrodynamic ones) from the direct numerical simulation conducted in a
cylindrical domain. We will discuss the dynamics of the system and show that the m = 1
Kelvin mode is crucial for the dynamo action. The second part will be dedicated to the
influence of the nutation angle; finally we will quantify the dissipation and the role of
turbulent fluctuations on the flow.