Fig. 5: Mean square displacement 〈r2(t)〉 for the numerical simulation case Ref.
From: Long-term microgravity experiments reveal a new mechanism for particle aggregation in suspension
The characteristic regimes of particle motion are indicated by the orange dotted line representing ballistic motion (∝ t2), and the blue dashed line corresponding to diffusive behavior (∝ t). The transition between these two regimes occurs at t ≈ 7500.
