  Using the (2+1)-dimensional ultrarelativistic viscous hydrodynamics+hadron
cascade, VISHNU, hybrid model, we study the $p_{\rm T}$-spectra and elliptic
flow of $\Lambda$, $\Xi$, and $\Omega$ in Au+Au collisions at
$\sqrt{s_{NN}}$=200 GeV and in Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV.
Comparing our model results with the data measurements, we find that the VISHNU
model gives general descriptions of the measurements of these strange and
multi-strange hadrons at several centrality classes at RHIC and LHC. Mass
ordering of elliptic flow $v_{2}$ among $\pi$, $K$, $p$, $\Lambda$, $\Xi$, and
$\Omega$ are further investigated and discussed at the two collision systems.
We find, at both RHIC and LHC, the $v_{2}$ mass ordering among $\pi$, $K$, $p$,
and $\Omega$ are fairly reproduced within the VISHNU hybrid model, and more
improvements are needed to implement for well describing the $v_{2}$ mass
ordering among $p$, $\Lambda$, and $\Xi$.
