Use the Interior Normal Impedance node to apply a transfer impedance condition on an interior boundary. The condition relates the normal stress at the two sides of the boundary (up and down) to the normal velocity via the normal transfer impedance Zn. The condition allows discontinuities (a slit) in pressure and temperature depending on the condition chosen for the temperature.

Enter a value or expression for the Normal impedance Zn (SI unit: Pa⋅s/m). This is the transfer impedance of the interior boundary.

Select a condition for the Tangential velocity — Slip (the default) or No slip. The No Slip option will apply an additional constraint for the velocity in the tangential direction on the two sides of the interior boundary.

Select a Thermal condition — Isothermal (the default) or Adiabatic.

To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box.

To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box. See Suppressing Constraints on Lower Dimensions for details.