BEM (Boundary element method) Acoustics requires only surface mesh of the source body for both internal cavity sound propagation or transmission, and for external sound propagation for radiation. You can either close openings (holes) to create watertight acoustic cavity for internal sound propagation or does not close openings for external sound radiation. You can use Wrap to create the surface mesh and remesh the surface with quadrilateral elements to improve surface mesh quality and reduce the mesh count. For External BEM Acoustics, a microphone grid surface of hemispherical shape can be created for results postprocessing using Create Enclosure step.
Note: BEM Acoustics mesh has linear element by default. Hence, BEM Acoustics recommends a minimum of 8 elements per wavelength of sonic speed of medium.
When you select Mesh Workflows as BEM Acoustics, Mesh Workflow loads a predefined template with Steps and Outcomes. Mesh Workflow performs these Steps through Controls and Outcomes to achieve the desired mesh for the BEM Acoustics.
BEM Acoustics workflow has the following steps:
Improve Wrap Mesh uses Wrapper Specific Surface Mesher for surface meshing.
Quad Based Remesh uses Constant Size Surface Mesher for remeshing.