Extracting the Internal Volume in 3D-CAD

To carry out internal volume extraction:

1. Rotate the model in the 3D-CAD View scene so that a face containing a hole is visible.
2. Right-click on the face, or the edge of the hole, and select Extract Internal Volume.
   
   
   The Extract Internal Volume panel appears.
   
   

   Here, you can see how many edges, faces, and bodies are currently selected.

3. In the 3D-CAD View scene, hold down the <Ctrl> key and continue to select faces and edges to indicate the position of each hole. You can select any combination of edges and faces. To specify the location of a hole that crosses two connected faces, select the edges.
4. If the internal volume spans multiple bodies, click inside the Enclosing Bodies group box and select the bodies from the 3D-CAD View scene or from the Bodies node in the 3D-CAD feature tree to select all bodies that are located between the outermost bodies of the volume.
   3D-CAD attempts to fill the internal space with a new solid body, placing caps over any holes that are identified during selection. This action results in the creation of a new body, which is previewed in yellow in the 3D-CAD view scene.
   
   
5. To identify leaks in the model:
6. If the empty space enclosed by the original geometry contains additional bodies, such as external bodies that partially submerge into the internal volume, these bodies are subtracted by default. If you want to subtract only specific bodies from the internal volume, set Inner Bodies to Subtract to Selected, click inside the Inner Bodies group box, and select those bodies from the from the 3D-CAD View scene or from the Bodies node in the 3D-CAD feature tree.

   If you do not want to subtract any inner bodies from the internal fluid volume, set Inner Bodies to Subtract to Selected and select no bodies. This feature allows you to exclude small bodies that do not contribute to the flow.

7. Choose whether to transfer custom names from the external body to the extracted volume. Activate the Face Names option to transfer custom face names from the external bodies to the extracted volume. Activate the Body Names option to transfer the name of the external body to faces on the extracted volume.
8. If you want to create a body group for the resulting body, activate the Create Body Group option.

   If you leave this option deactivated, the resulting body is placed at the same level as the input bodies.

9. Click OK to proceed with the volume extraction.

An Extract Internal feature node is added to the feature tree, and the new body is added to the Bodies manager node. To visualize the new internal body, hide the original bodies so that you are only left with the new body.

To edit the edges and faces that define the feature:

• Right-click on the Extract Internal node and select Edit.