Time evolution of the critical velocities for three models. The critical velocity v_1,crit is derived from the total potential function Ψ = Ψ_grav + Ψ_rot + Ψ_tide + Ψ_dis,rot + Ψ_dis,tide in model M1(Solid line). The critical velocity v_2,crit is derived from potential function Ψ = Ψ_grav + Ψ_rot + Ψ_tide in model M1 (Dot-dashed line). The critical velocity v_3,crit is derived from the potential function Ψ_r = Ψ_grav + Ψ_rot + Ψ_dis,rot in model M1 (Dashed line).