Acoustic-Porous Boundary
The Acoustic-Porous Boundary coupling () is used to couple a Pressure Acoustics interface to a Porous Material (Biot’s model) domain from the Poroelastic Waves interface. This includes both the FEM based acoustics interfaces and the BEM based acoustics interface. The boundary coupling feature includes the following interaction between the fluid and the porous domains:
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Continuity of the fluid pressure on the boundaries where the fluid interacts with the porous domain. The pore pressure in the porous domain is set equal to the total pressure in the fluid domain
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A pressure load from the fluid pressure is experienced by the elastic waves in the porous material
where pt is the total acoustic pressure in the fluid domain and the left hand side represents the total stress for the saturated porous domain.
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The pressure acoustic domain also experiences a normal acceleration that depends both on the acceleration of the porous matrix skeleton but also on the pore pressure. Because of the pressure boundary condition, which is a bidirectional constraint, this condition reduces to the fluid experiencing a normal acceleration
Settings
See Settings for further details about Label and Name.
The default Name (for the first multiphysics coupling feature in the model) is apb1.
Coupled Interfaces
This section defines the physics involved in the multiphysics coupling. The Acoustics and Porous media lists include all applicable physics interfaces. See the Coupled Interfaces in Acoustic-Structure Boundary for details.