Validation of the dust feedback implementation for singlesized grains (a=0.1 mm, Σ_g,0=0.15 g cm⁻², f_dtg=0.1). Top: Radial velocity; Bottom: Difference between azimuthal velocity and local Keplerian velocity. The dashed lines are the analytical solutions (Benítez-Llambay et al. 2019, Eqs. 72–73), and the squares represent the dust particle velocities. For clarity, we binned the velocity of ten neighbouring particles to one representative data point.