The Acoustic-Piezoelectric Interaction, Frequency Domain multiphysics interface (
), found when adding a physics interface
under the
Acoustics>Acoustic-Structure Interaction branch (
), combines the Pressure Acoustics, Frequency Domain, Solid Mechanics, and Electrostatics interfaces to connect and solve for the acoustic pressure variations in fluids with the structural deformation in both solids and piezoelectric solid domains. The physics interface also includes features from Electrostatics to solve for the electric field in the piezoelectric material. It may be used for modeling piezoelectric transducers for sonar or medical applications and, for example, enhancing the impedance matching layers as well as the far-field radiation patterns of the transducer.
When a predefined Acoustic-Piezoelectric Interaction, Frequency Domain interface is added from the
Acoustics>Acoustic-Structure Interaction branch (
) of the
Model Wizard or the
Add Physics windows, the
Pressure Acoustics, Frequency Domain,
Solid Mechanics, and
Electrostatics interfaces are added to the Model Builder.
In addition, the Multiphysics Couplings node is added, which automatically includes the
Acoustic-Structure Boundary and
Piezoelectric Effect multiphysics couplings.
When the predefined multiphysics interface is used, the Selection on the
Acoustic-Structure Boundary multiphysics coupling is automatically set to
All boundaries. In this way, the multiphysics coupling is automatically active on all boundaries with
Pressure Acoustics, Frequency Domain on one side and
Solid Mechanics on the other. Similarly, the
Selection on the
Piezoelectric Effect multiphysics coupling is automatically set to
All domains and active in all valid domains.
For example, if the single interfaces are added, COMSOL Multiphysics adds an empty Multiphysics Couplings node. You can choose the available multiphysics coupling, but you need manually to select on which boundaries or domains they need to be applied, or select
All boundaries or
All domains to recover the predefined behavior.
The Acoustic-Structure Boundary multiphysics coupling is described in the
Multiphysics Couplings chapter. The Piezoelectric Effect is described for
The Piezoelectricity Interface.
Physics nodes are available from the Physics ribbon toolbar (Windows users),
Physics context menu (Mac or Linux users), or right-click to access the context menu (all users).