In collaboration with J.-P. Laval, B. Dubrulle, F. Daviaud, and J.-F. Pinton
We report direct numerical simulations of dynamo generation for flow generated using a Taylor-Green
forcing. We find that the bifurcation is subcritical and show its bifurcation diagram. We connect the
associated hysteretic behavior with hydrodynamics changes induced by the action of the Lorentz force.
We show the geometry of the dynamo magnetic field and discuss how the dynamo transition can be
induced when an external field is applied to the flow.
Ponty, Y., Laval, J.P., Dubrulle, B., Daviaud, F. and Pinton, J.F., "Subcritical Dynamo Bifurcation in the Taylor-Green Flow", Physical Review Letters, 99, p. 224501 (2007) (doi:10.1103/PhysRevLett.99.224501)