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A numerical study of the magnetic induction equation has been performed onvon Karman type flows. These flows are generated by two co-axialcounter-rotating propellers in cylindrical containers. Such devices arecurrently used in the von Karman sodium (VKS) experiment designed to studydynamo action in an unconstrained flow. The mean velocity fields have beenmeasured for different configurations and are introduced in a periodiccylindrical kinematic dynamo code. Depending on the driving configuration, onthe poloidal to toroidal flow ratio and on the conductivity of boundaries, someflows are observed to sustain growing magnetic fields for magnetic Reynoldsnumbers accessible to a sodium experiment. The response of the flow to anexternal magnetic field has also been studied: The results are in excellentagreement with experimental results in the single propeller case but can differin the two propellers case.Comment: 20 pages, 32 figure

Numerical study of homogeneous dynamo based on experimental von K�rm�n type flows