New Functionality in Version 4
- The definition of material properties has been reworked and extended, both for frequency and time domains.
- Thin interior walls—hard, with acceleration, impedance or perforations—can now be defined directly as boundary conditions. No modification to the geometry is necessary.
- The Scattered field formulation no longer makes any assumptions about the incident field. This makes it easier to model complicated situations with both fluid-fluid and fluid-solid interfaces.
- A new multiphysics interface for acoustic-structure interaction has been added. The coupling between fluids and solids is fully automated.
The ultraweak formulation is not implemented in version 4.0a and is not planned for re-implementation in its previous form. The reason is that this formulation is very difficult to use without basis element order adaptivity (p-adaptivity).
Pair Boundary Conditions
Vortex sheet condition on assembly pair boundaries is missing in the Aeroacoustics interface. You can use the slit-based vortex sheet boundary condition instead.