The Lumped Port feature connects a waveguide or duct inlet/outlet to a lumped representation element. This can be an Electrical Circuit, a two-port network defined through a transfer matrix, or a lumped representation of a waveguide. Basically, it couples the end of a waveguide to an exterior system that has a given lumped representation. See the Lumped Port in the The Pressure Acoustics, Frequency Domain Interface.

For the Lumped Port condition the boundary is always assumed to have a Slip (perfect) mechanical behavior and an Adiabatic thermal behavior.