The Moving Wall condition is used to model a vibrating wall with harmonic variations. The condition is a variant of the Ingard-Myers condition used for the
Impedance. See
Ref. 1 and
About the Moving Wall Boundary Condition located in the
Theory Background for the Aeroacoustics Branch section for further details.
Select a Displacement:
Inward normal displacement vn (SI unit: m) (the default),
Displacement field vw (SI unit: m),
Inward normal velocity un (SI unit: m/s), or
Velocity field uw(SI unit: m/s). Then enter values or expressions based on the selection.
) and select Advanced Physics Options in the Show More Options dialog box. 
) and select Advanced Physics Options in the Show More Options dialog box. See Suppressing Constraints on Lower Dimensions for details.