(a) Normalized dynamical force, acting through the symmetry axis , between two inclusions separated by a distance , versus time. The parameters are , , and either (plain curve) or (dashed curve). The dotted line indicates the equilibrium force . (b) Normalized maximum of the dynamical force as a function of the separation between the inclusions (black dots). The black line is a power law . The gray line is the normalized equilibrium force and the dashed gray line is its asymptotic power law at short separations.
Normalized dynamical force between two inclusions separated by , calculated by integrating the stress tensor along a small circle of reduced radius around one inclusion. The parameters are , , and either (top curve) or (bottom curve).