Figure 2.

(a) Different energies as a function of the vortex-particle distance q_⊥/ξ during the approach of a particle with size a_p = 2.7ξ. The initial separation is q_⊥ = 45.3ξ and the particle has zero velocity. Markers are numerical data and lines theoretical curves of corresponding colours. (b) Same energies as in (a) in (log − log scale). Initial q_⊥ = 85.1ξ and initial velocity ${\dot{q}}_{\perp }=-0.04c$.