  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+Au
collisions at high energies, one finds that the values of $v_2$ are all
positive and the number-of-constituent-quark (NCQ) scaling holds. On the other
hand, results from collisions at 3 GeV, the midrapidity $v_2$ is negative for
all hadrons and NCQ scaling is absent. In addition, the midrapidity $v_1$
slopes for all hadrons are found to be positive. Furthermore, the features of
negative $v_2$ and positive $v_1$ slope at 3 GeV can be reproduced by
calculations with baryonic mean-field potential in transport model. These
results imply that in 3 GeV Au+Au collisions, the medium is characterized by
baryonic interactions.
