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We report results of $v_1$ and $v_2$ for identified hadrons ($\pi^{\pm},K^{\pm}, K_{S}^{0}, p, \phi$ and $\Lambda$) from Au+Au collisions at$\sqrt{s_{NN}}$ = 3 GeV and $v_2$ for $\pi^{\pm}, K^{\pm}, p$ and $\bar{p}$ at$\sqrt{s_{NN}}$ = 27 and 54.4 GeV using the STAR detector at RHIC. In Au+Aucollisions at high energies, one finds that the values of $v_2$ are allpositive and the number-of-constituent-quark (NCQ) scaling holds. On the otherhand, results from collisions at 3 GeV, the midrapidity $v_2$ is negative forall hadrons and NCQ scaling is absent. In addition, the midrapidity $v_1$slopes for all hadrons are found to be positive. Furthermore, the features ofnegative $v_2$ and positive $v_1$ slope at 3 GeV can be reproduced bycalculations with baryonic mean-field potential in transport model. Theseresults imply that in 3 GeV Au+Au collisions, the medium is characterized bybaryonic interactions.

Anisotropic Flow Measurements of Identified Particles in the STAR Experiment