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We study numerically the dynamo transition of an incompressible electricallyconducting fluid filling the gap between two concentric spheres. In a firstseries of simulations, the fluid is driven by the rotation of a smooth innersphere through no-slip boundary conditions, whereas the outer sphere isstationary. In a second series a volume force intended to simulate a roughsurface drives the fluid next to the inner sphere within a layer of thicknessone tenth of the gap width. We investigate the effect of the boundary layerthickness on the dynamo threshold in the turbulent regime. The simulations showthat the boundary forcing simulating the rough surface lowers the necessaryrotation rate, which may help to improve spherical dynamo experiments.

Simulations of the kinematic dynamo onset of spherical Couette flows with smooth and rough boundaries