Name of Principal 3D regions in DM
 

When I am solving fluid simulation via CFX all the names of Principal 3D regions are in "B1.P3" kind of format. Although I did create geometry in design modeler and expect that names of 3D regions will be consistent with name of bodies in DM. Is there any way to have the name of 3d regions the same as body name in DM other than create a name selection with prefix?

You'll have to create a Named Selection that points to a 3D region if you want names to pass through to CFX-Pre. The name of a part/body shown in the Outline tree is only used in DM/Meshing and not passed downstream (this name is associated with the geometry not the mesh; only the mesh gets passed to CFX-Pre).