Interior Normal Velocity
The Interior Normal Velocity node adds a normal velocity on an interior boundary and ensures that the pressure is noncontinuous here. 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 times the velocity.
Interior Normal Velocity
Select a Type: Velocity (the default) or Inward velocity.
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For Velocity enter values for the components of the Velocity v0 (SI unit: m/s2).
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For Inward velocity enter the value of the Inward velocity vn (SI unit: m/s2) in the normal direction. Use a positive value for inward velocity or a negative value for outward velocity. The normal of the boundary points outward. The normal is depicted as a red arrow in the graphics window on the selected boundary.