The Tools>Volume Shapes node is the manager object for all volume shapes that have been saved in the simulation.
It appears in the object tree as soon as you create a mesh continuum, and is empty to allow creation of the first volume shape. The volume shapes manager can hold any number of volume shapes up to the computer's memory limits.
Volume shapes allow any one of four different types of closed volumes to be defined using the pop-up menu:
This is for the purpose of allowing volume sources to be included as part of the meshing process in STAR-CCM+. The volume shapes can be created manually (using data values) or graphically using the point tool.