Isothermal Acoustics in Composite Media

Abstract

In this chapter we consider acoustics in composite media with two different components. In the first configuration the composite medium $Q$ consists of some elastic body $\varOmega ^{(s)}$ and a poroelastic medium $\varOmega$. In the second configuration the composite medium $Q$ consists of some liquid domain $\varOmega ^{(f)}$ and a poroelastic medium $\varOmega$. And in the second configuration we consider two different poroelastic media $\varOmega$ and $G$. For each type of component all the limiting regimes are already known and the main problem here concerns the boundary conditions on the common boundary between the two different components.