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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, or by a Boolean difference operation, subtracting a closed domain from the model geometry.
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The infinite void is the single unbounded region surrounding the geometry model. This is the typical region selected when modeling scattering or radiation problems with the Pressure Acoustics, Boundary Elements interface.
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If the model contains finite voids and an infinite void, those volumetric regions appear in the domain selection lists for the BEM interface and in the Selection List window as Finite void 1, and so on, and as Infinite void.
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It is important to also assign the materials under the Materials node to the appropriate selections of the Pressure Acoustics model. Note that material parameters need to be constant for each applied Pressure Acoustics model.
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Assigning the Pressure Acoustics model to a selection adds the necessary equations to the exterior boundaries of the selections. Only these boundaries need to be meshed. The condition at infinity (of the infinite void) is selected in the Condition at Infinity section. The typical and default is an outgoing wave condition.
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