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We study the effect of different boundary conditions on the kinematic dynamothreshold of von Karman type swirling flows in a cylindrical geometry. Using ananalytical test flow, we model different boundary conditions: insulating wallsall over the flow, effect of sodium at rest on the cylinder side boundary,effect of sodium behind the impellers, effect of impellers or side wall made ofa high-magnetic-permeability material. We find that usinghigh-magnetic-permeability boundary conditions decreases the dynamo threshold,the minimum being achieved when they are implemented all over the flow.

Effect of magnetic boundary conditions on the dynamo threshold of von Kármán swirling flows