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 so-called 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.