  We present the results of a suite of \Nbody simulations aimed at
understanding the fundamental aspects of the long-term evolution of the
internal kinematics of multiple stellar populations in globular clusters. Our
models enable us to study the cooperative effects of internal,
relaxation-driven processes and external, tidally-induced perturbations on the
structural and kinematic properties of multiple-population globular clusters.
To analyse the dynamical behaviour of the multiple stellar populations in a
variety of spin-orbit coupling conditions, we have considered three reference
cases in which the tidally perturbed star cluster rotates along an axis
oriented in different directions with respect to the orbital angular momentum
vector. We focus specifically on the characterisation of the evolution of the
degree of differential rotation and anisotropy in the velocity space, and we
quantify the process of spatial and kinematic mixing of the two populations. In
light of recent and forthcoming explorations of the internal kinematics of this
class of stellar systems by means of line-of sight and astrometric
measurements, we also investigate the implications of projection effects and
spatial distribution of the stars adopted as tracers. The kinematic and
structural richness emerging from our models further emphasises the need and
the importance of observational studies aimed at building a complete
kinematical picture of the multiple population phenomenon.
