The Aeroacoustic–Structure Boundary coupling () is used to couple an Aeroacoustic interface (it only applies to the Linearized Navier–Stokes interfaces) to any structural component. The feature couples to Solid Mechanics, Shell, Layered Shell, Membrane, and Multibody Dynamics interfaces. The coupling can be used to, for example, model fluid–structure interaction (FSI) in the frequency domain.

where ut,fluid is the total fluid velocity (including a background component if applicable), usolid is the solid displacement, and n is the surface normal. The first equation is in both cases the frequency domain and the second is in the time domain. This coupling results in the stress (or normal stress) also being continuous across the boundary. The condition for the total temperature Tt can be set to either isothermal or adiabatic. In the case where a shell or membrane is interior to the thermoviscous acoustics domain, a slit is automatically applied to the pressure p and temperature T degrees of freedom (DOFs).

See Settings for further details about Label and Name.

The default Name (for the first multiphysics coupling feature in the model) is aesb1.

Select the Thermal condition that applies on the solid surface to be either Isothermal (the default selected) or Adiabatic.

Select the Mechanical condition as No slip (the default) or Slip (perfect).

See Constraint Settings under the Thermoviscous Acoustic–Structure Boundary.

This section defines the physics involved in the multiphysics coupling. The Aeroacoustics and Structure lists include all applicable physics interfaces. See the Coupled Interfaces in Acoustic–Structure Boundary for details.