Numerical Simulation of the Riga Dynamo Experiment

We present numerical simulations for the Riga dynamo experiment, which is intended
to verify the magnetic field self-excitation in a helical flow of a conducting fluid.
Testing a wide variety of axial and azimuthal velocity profiles we show the importance
of the global helicity for the efficiency of the dynamo. Predictions are made on
the shape of the arising magnetic field and the back-reaction of the
Lorentz force on the flow.