I probably need to run another coupled model to test - I did a lot of co-simulation but haven't needed to recently. Rocky does all the particle work, and takes the flow data from Fluent. Rocky then returns a drag and volume fraction to Fluent so the flow field can be updated. If you look in the Rocky manuals (in Help) there's a section on coupling to Fluent - hopefully it's explained there.
I'll leave a message for a counterpart on the Rocky team (I use it to extend Fluent's capabilities, he then covers the more complex Rocky side of things) for when he wakes up.
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