Reply To: Correct CFX Pre Setup to avoid isolated fluid regions

[Mark Owens]

OK, then I don't think you can raise a support request. The probem seems to be with the complex nature of the geometry. Maybe practice with a more simple one first. Ultimately, if the geometry is properly connected with share topology working properly, then Ansys meshing will report that there are no contact regions. So you should know at the meshing stage whether it is working. Then when CFX reads in the mesh it will not create any mesh interfaces. The default domain boundary should then only be composed of the exterior faces of the entire flow domain. You cannot get an isolated region error in that case except by creating walls that close off one region from another. As you start creating boundaries in CFX-Pre (inlets, outlets, walls, etc) those faces will be removed from the default boundary. If you create an explicit boundary for all the faces of the domain the default boundary will dissapear.  So maybe create all the boundaries you think you should have and see whether there are any faces left in the default boundary and where they are.