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Ah, don't set anything on the non-overlapping walls. They're for when the interface faces don't line up. With a VAWT you should have a single face on either side of the rotor-stator zones. 

The file download is one of the conditions set to ensure we can't answer model specific questions on the public forum. Because Ansys software is technically dual use (US definition for Export Law) I need to be careful as my knowledge counts as an export - we've had to have training on this!