  We report our recent study on the global and local polarization of $\Lambda$
hyperons in Au+Au collisions at RHIC-BES energies within the (3+1)-dimensional
CLVisc hydrodynamics framework. We present our numerical results for the global
polarization as the function of collision energies and the local polarization
along the beam direction as functions of azimuthal angle in $20-50$% centrality
at $\sqrt{s_{NN}}$=7.7 GeV Au+Au collision energy. We have discussed the
effects of initial conditions, Spin Hall effect and baryon diffusion.
