Often say for an ICFD analysis in LS-Dyna one needs to generate a skin mesh on the exterior boundaries of the fluid domain, and potentially a solid mesh for any structures that might be included in this type of analysis.
One way is to generate the surface bodies on all fluid domain boundaries/faces, and mesh those with shells e.g., inside an LS-Dyna system in Workbench.
For this reason it would be of help to generate automatically surface bodies on all faces of a fluid enclosure.