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The polarizations of $\Lambda$ and $\bar{\Lambda}$ hyperons are importantquantities in extracting the fluid vorticity of the strongly coupled quarkgluon plasma and the magnitude of the magnetic field created in off-centralheavy-ion collisions, through the spin-vorticity and spin-magnetic coupling. Wecomputed the energy dependence of the global $\Lambda$ polarization inoff-central Au+Au collisions in the energy range $\sqrt{s_{NN}}=7.7-200$ GeVusing a multiphase transport model. The observed polarizations with twodifferent impact parameters agree quantitatively with recent STAR measurements.The energy dependence of the global $\Lambda$ polarization is decomposed asenergy dependence of the $\Lambda$ distribution at hadronization and thespace-time distribution of the fluid-vorticity field. The visualization of boththe $\Lambda$ distribution and the fluid-vorticity field show a smaller tilt athigher collisional energies, which indicates that the smaller globalpolarization at higher collisional energies is caused by a smaller angularmomentum deposition at midrapidity.

Global $\Lambda$ polarization in heavy-ion collisions from a transport model