The Pair Acoustic–Structure Boundary coupling (
) is used to couple the
Pressure Acoustics, Frequency Domain or the
Pressure Acoustics, Transient interface to the
Solid Mechanics interface in an assembly geometry where identity pairs have been created. This allows the use of a nonconforming mesh at the acoustic-structure boundary. As the wave speeds differ in solids and fluids, the computational mesh can take advantage of this when resolving the waves and in this way saving degrees of freedom when solving.