Thermoviscous Acoustic–Thermoelasticity Boundary
The Thermoviscous Acoustic–Thermoelasticity Boundary coupling () is used to couple Thermoviscous Acoustics, Frequency Domain (or Transient) in a fluid to the combined Solid Mechanics and Heat Transfer in Solids in a solid domain. The Thermal Expansion multiphysics coupling is required in the solid to model the coupled Thermoelasticity multiphysics phenomenon. The The Thermoelasticity Interface exists as a predefined multiphysics interface under the Structural Mechanics>Thermal–Structure Interaction branch, when adding a physics interface using the Model Wizard or the Add Physics window.
This multiphysics coupling allows modeling the combined thermoviscous losses in acoustic-structure interaction problems to great detail. In particular, the effect of a nonideal thermal condition at the fluid-structure interface can be captured. This is of particular interest in, for example, MEMS systems; or in systems where the thermal properties of the fluid and the solid are similar to some extent, for example, in a water-glass systems.
Coupled Interfaces
This section defines the physics involved in the multiphysics coupling. The Thermoviscous acoustics, Structure, and Thermal perturbation lists include all applicable physics interfaces. For the Thermoviscous acoustics both the Thermoviscous Acoustics, Frequency Domain and the Thermoviscous Acoustics, Transient interfaces can be selected.
The Thermoviscous Acoustic–Thermoelasticity Boundary coupling is only applicable for Frequency-Domain Perturbation (possibly combined with a Stationary study) and Time Dependent studies. This is the case as the Heat Transfer in Solids interface is not formulated in terms of perturbations as all acoustic interfaces are. This typically requires solving for the stationary temperature field in the solid, which then forms the linearization point for the acoustic model. The temperature linearization point can also be taken from the Initial expression. The stationary temperature field can be selected in Model Input for the acoustic model to get consistent material data.
See The Thermoviscous Acoustic–Thermoelasticity Interaction Multiphysics Interfaces section in the Thermoviscous Acoustics Interfaces chapter for more details.
Prestressed Micromirror Vibrations: Thermoviscous–Thermoelasticity Coupling. Application Library path Acoustics_Module/Vibrations_and_FSI/micromirror_prestressed_vibrations