Finite and Infinite Voids
For modeling with BEM, a geometry model can have multiple domains and multiple finite voids. However, there can be only one infinite void.
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A domain corresponds to a finite region where the geometry model is of the type solid. The geometry in most models based on FEM consists of domains only.
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Any other finite region is a finite void. A finite void can be created as a geometric primitive of type curve (in 2D) or surface (in 3D), for example.
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The infinite void is the single unbounded region surrounding the geometry model.
If the model contains finite voids and an infinite void, those volumetric regions appear in the domain selection lists for BEM interfaces and in the Selection List window as Finite void 1, and so on, and as Infinite void.