Evolution of the high resolution 2D r – z inviscid disk with ϵ₀ = 0.01 and dust inflow. In the top panel, we plot the r – z view of the dust to gas volume density at the final integration time t = 1500 P_orb. The lower panels show the evolution with time versus r/r₀ of, respectively: the vertically integrated density ratio, Σ_d/Σ_g (second panel), the η values computed from midplane pressure gradient (third panel) and the midplane dust’s radial velocity υ_r (bottom panel). In the third panel, a transition from blue to red indicates an η sign inversion and thus a dust trapping location.