The flow angle fluctuation $A_2^{\rm F}$ in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV as a function of the transverse momentum, $\pt$, in centrality classes 0$-$5% (left), 10$-$20% (middle), and 30$-$40% (right). Comparison with iEBE-VISHNU with TRENTO initial conditions and $\eta/s(T)$, MUSIC with Glauber initial conditions and $\eta/s=0.08$, MUSIC with TRENTO initial conditions and $\eta/s=0.08,0.12,0.16$, and AMPT are shown as coloured bands.