Dust-density pattern obtained from run β04-2D (2D w/bump). Each panel represents a snapshot at a) tΩ = 50, b)100; c)250; and d)500. Dust densities increase from black (zero density) to bright white (ρ_d = 2ρ₀). Initially, the pressure bump concentrates the dust particles, with the dust-to-gas mass ratio being nearly unity (panel a)). Subsequent panels show the growth of SI in this dust-dense region. We note that the region near the pressure bump is zoomed-in and the whole computational domain is radially wider.