  Using the adaptive time-dependent density matrix renormalization group
method, we numerically investigate the expansion dynamics of bosons in a
one-dimensional hard-core boson model with three-body interactions. It is found
that the bosons expand ballistically with weak interaction, which are obtained
by local density and the radius $R_n$. It is shown that the expansion velocity
$V$, obtained from $R_n=Vt$, is dependent on the number of bosons. As a
prominent result, the expansion velocity decreases with the enhancement of
three-body interaction. We further study the dynamics of the system, which
quenches from the ground state with two-thirds filling, the results indicate
the expansion is also ballistic in the gapless phase regime. It could help us
detect the phase transition in the system.
