Mesh File
Click Browse to open the Import Mesh dialog box and search for the mesh file to import.
The most common mesh file formats can be imported in Quick Setup mode. If other mesh formats, advanced options or user import methods are required, General mode should be used.
For details, see Importing and Transforming Meshes.
Available Volumes > 3D Regions
Using the drop-down menu, select the 3D region you want to use for the domain. By default, all 3D regions of mesh from the selected mesh file will be selected.