A case which is set up with manually created Domain Interfaces, each of which have multiple Domains on at least one side of the interface cause the solver to fail with the following error:
"Non-unique Boundary names have been defined. This is not valid."
There is a bug in CFX-Pre for automatically generated Domain Interface boundary names when there is more than one domain on one side, and a Composite region that comprises multiple Primitive regions is used in the definition. The bug results in potentially non-unique names for the associated INTERFACE boundaries which is not allowed.
Define the Domain Interface in terms of multiple 'Primitive' regions in CFX-Pre rather than the associated 'Composite' region.
A fix for Release 10.0 is available on request.