  The acoustic waves generated by moving bodies and the movement of bodies by
acoustic waves are central phenomena in the operation of musical instruments
and in everyday's experiences like the movement of a boat on a lake by the wake
generated by a propelled ship. Previous works have successfully simulated the
interaction between a moving body and a lattice-Boltzmann fluid by immersed
boundary methods. Hereby, we show how to implement the same coupling in the
case of a Lattice-Boltzmann for waves, i.e. a LBGK model that directly recovers
the wave equation in a linear medium, without modeling fluids. The coupling is
performed by matching the displacement at the medium-solid boundary and via the
pressure, which characterizes the forces undergone by the medium and the
immersed body. The proposed model simplifies the preceeding immersed boundary
methods and reduces the calculations steps. The method is illustrated by
simulating the movement of immersed bodies in two dimensions, like the
displacement of a two-dimensional disk due to an incoming wave or the wake
generated by a moving object in a medium at rest. The proposal consitutes a
valuable tool for the study of acoustical waves by lattice-Boltzmann methods.
