Left panel: Elliptic flow $v_2$ of non-prompt \Dzero mesons (blue points) and average of prompt non-strange D mesons  (red points) as a function of \pt in 30--50\% Pb--Pb collisions at $\sqrtsNN=5.02 \TeV$. The symbols are positioned at the average \pt of the reconstructed \Dzero mesons. Statistical uncertainties are shown as vertical lines and systematic uncertainties as boxes. Right panel: non-prompt \Dzero-meson $v_2$ compared with model calculations .