Hello,
Would it be possible to add the Interior Impedance/Pair Impedance BC to the Pressure Acoustics, Boundary Elements Interface? From my knowledge of BEM I can't see any reason why it wouldn't be straightforward.
Same goes for Interior Perforated Plate/Pair Perforated Plate BC, which appears to be a wrapper for the Interior Impedance/Pair Impedance BC.
One could for example then do a simulation comparison* of this experiment: https://asa.scitation.org/doi/10.1121/1.3531804
- in this paper a BEM simulation was run with the perforations explicitly meshed. This wouldn't be necessary with the perforated plate BC.