Interior Normal Displacement
The
Interior Normal Displacement
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. 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 Displacement
Select a
Type
:
Displacement
(the default) or
Normal displacement
.
•
For
Displacement
enter values for the components of the
Displacement
d
0
(SI unit: m).
•
For
Normal displacement
enter the value of the
Normal displacement
d
n
(SI unit: m) 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).
