Acoustic Cavity Mesh Panel

Use the Acoustic Cavity Mesh panel to create a fluid volume mesh for the open-air volumes of an enclosed compartment, such as the passenger compartment of a vehicle. Structural components such as seats are modeled as separate acoustic volumes. Once generated, this mesh can be used in noise/vibration testing.

Location: Only accessible via the search () in the top, right corner of the modeling window.

Panel Options

Option	Action
structure: comps	Select the components that surround the cavity.
seats: comps	Select the solid bodies representing the seats.
Seat coupling	node to node remesh Obtain new node-connected cavities for the seats, matching seat nodes, and cavity nodes on a 1:1 basis. MPC no remesh Connect the input seat components to the found cavities using MPCs, which allows node mapping at a ratio other than 1:1. Only use this option if the seat components are composed of solid elements. For proper MPC creation, the seat mesh size must be relatively similar to the size used to create the acoustic cavity mesh; in general, the size difference should be no more than 30%.
create hole elements	Create permanent elements from the temporary elements used to patch over the holes, and store them in their own collector called ^patched_holes.
target element size	Define the element size. Max frequency is calculated based on this target element size and number of elements per wavelength specified in Options dialog, accessed from the AcousticCavity browser. The actual mesh may vary from this depending on quality requirements.
min element size	Define the minimum element size. The acoustic cavity mesh created should not have any elements below the specified minimum element size.
max element size	Define the maximum size of internal elements. Max frequency is calculated based on the max element size and the number of elements per wavelength specified in the Options dialog, accessed from the AcousticCavity browser.
max frequency	Define the maximum frequency for which the acoustic cavity is valid for vibro-acoustic analysis. Max frequency is automatically calculated based on the target element size and the number of elements per wavelength specified in Options dialog, accessed from the AcousticCavity browser. It is possible to automatically calculate the target element size by specifying the maximum frequency.
gap patch size	Define how large of a gap in the geometry the mesher will ignore. This value should be greater than your mesh size. Gaps in geometry equal to or less than this size (in model units) will be patched or plastered over while the mesh is generated. Gaps larger than this will be taken into account and flooded with mesh to fill the cavities on the other side.
hole patch size	Define how large of a hole in the geometry the mesher will ignore. This value should be greater than your mesh size. Holes in the geometry equal to or less than this size (in model units) will be patched or plastered over while the mesh is generated. This is useful for excluding things like bolt holes. Gaps larger than this will be taken into account and flooded with mesh, which may result in bleed-through that connects different cavities of your model and treats them as a single mesh. For instance, in a passenger car you might end up with a single complex-shaped mesh that encompasses both the passenger cabin and the trunk space, with a narrow connection where a hole existed between the two otherwise separate cavities.
feature angle	Define a feature angle.

Command Buttons

Button	Action
preview	Create the voxel-based preview mesh.
return	Exit the panel.