Interior Normal Acceleration
The Interior Normal Acceleration sets up an interior source that can be used to model a thin vibrating structure, for example, a loudspeaker diaphragm. Add this node from the Interior Conditions submenu. The pressure is discontinuous across this boundary.
The pressure is discontinuous across this boundary. Use the up and down version of the postprocessing variables to visualize quantities on the two sides of the boundary, for example, the up side total pressure is pabe.p_t_up.
Interior Normal Acceleration
Select a Type: Acceleration (the default) or Normal acceleration.
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For Acceleration enter values for the components of the Acceleration a0
(SI unit: m/s2).
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For Normal acceleration enter the value of the Normal acceleration an (SI unit: m/s2) in the normal direction.
In the BEM formulation, interior conditions cannot intersect other (exterior) conditions. It is recommended that this type of model is set up by using FEM in the region around the interior condition and BEM outside of that region.
Physics Symbols
Select Show physics symbols to show the normal direction as a symbol (red arrow) in the Graphics window (selected per default).