Abstract
We study the behavior of heavy inertial particles in the flow field of two like-signed vortices. In a frame co-rotating with the two vortices, we find that stable fixed points exist for these heavy inertial particles; these stable frame-fixed points exist only for particle Stokes number St < Stcr. We estimate Stcr and compare this with direct numerical simulations, and find that the addition of viscosity increases the Stcr slightly. We find that the rate at which particles fall into the fixed points increases until the fixed points disappear at St = Stcr. These frame-fixed points are between fixed points and limit cycles in character.
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