Interior Normal Displacement
The Interior Normal Displacement node adds a normal displacement on an interior boundary and ensures that the pressure is noncontinuous. Add this node from the Interior Conditions submenu. The pressure has a slit condition on this boundary. The condition is very similar to the Interior Normal Acceleration condition, simply having the acceleration given by (iω)2 times the displacement.
Interior Normal Displacement
Select a Type: Displacement (the default) or Normal displacement.
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For Displacement enter values for the components of the Displacement d0 (SI unit: m/s2).
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For Normal displacement enter the value of the Normal displacement dn (SI unit: m/s2) in the normal direction. The normal is depicted as a red arrow in the graphics window on the selected boundary.