Interior Impedance and Pair Impedance
Use the Interior Impedance or Pair Impedance node in frequency domain analysis to define the specific transfer impedance at the boundary between two domains or parts in an assembly as the ratio of pressure drop to normal velocity Zn = Δp/(n · v). The formulation is following the so-called Ingard-Myers condition. The associated boundary condition is
On pair (interior) impedance conditions the up/down, that refers to the up and down side of an interior boundary, is replaced by a 1 and 2 index in the equation display. These refer to the two source and destination faces in the pair.
Interior/Pair Impedance (Ingard-Myers)
Enter a Specific transfer impedance Zn (SI unit: Pa·s/m).