Defining Acoustic Domains

You can define an acoustic domain to specify the physical fluid to be simulated in an acoustics simulation.

See Also
Acoustic Domain
  1. From the Abstractions section of the action bar, click Acoustic Domain .
  2. Optional: Enter a descriptive Name.
  3. Select the structural parts that contain the fluid.
    1. Expand the Parts container in the dialog box, and click Select Part.
    2. Select the geometry supports in the model, and click OK.

      You can select an orphan mesh structure that is contained in the current finite element model representation. The structural orphan mesh must be part of the same finite element model representation as the hex-dominant mesh of the fluid domain. Mesh Groups cannot be used for the structural geometry.

  4. Optional: Specify the bounding plane that you want to use.

    You can define a bounding plane by manipulating the triad controls in the model view. You can also specify X-, Y-, and Z-values and i-, j-, and k-values directly in the dialog box. You can define a plane based on the global coordinate system or a local coordinate system.

    Click OK.
  5. Define the three-dimensional region in which the fluid flows.
    1. Expand the Regions container, and click Add Region.
    2. Select the geometry support.

      Select one or more surfaces as the geometry support. Select the surface that encloses the cavity that is filled by the fluid—for example, the inner wall of a pipe. You can select a face group to define this support.

      A glyph is displayed in the model to show the location of the fluid.
    3. If necessary, click Flip direction to change the side of the surface on which the fluid flows. For example, the glyph in the figure below shows that the fluid is located inside the pipe.



  6. Select the structure's inlets and outlets through which the fluid flows. Specify the location of all inlets and outlets, but you do not differentiate between them in this procedure.
    1. Expand the Inlets/Outlets container, and click Add Inlet/Outlet.
    2. Select the geometry support.

      You must select a closed loop as the geometry support. In the figure below, the circular inner edge of the pipe opening is selected. You can select an edge group for this support.



      A circular disc glyph shows the location of the inlet or outlet opening.
    3. Repeat steps a and b to select as many inlets and outlets as necessary in the model. For example, a car's exhaust manifold might have four inlets and one outlet.
  7. Click OK.

After you create the acoustic domain, it becomes part of the simulation model and can be seen in the tree under the Abstractions node of the FEM representation.