That makes a lot of sense, thanks. I had assumed that the solver should automatically handle buoyancy effects like you say, but without modifying the UDF, my results were quite inaccurate even with increasing mesh density. I followed the advice of users in the thread https://www.cfd-online.com/Forums/fluent/105250-buoyancy-6dof-solver-fluent.html and while I want to run a few more tests, the results are much better. Perhaps I missed something small in the case setup which would avoid the UDF modification?
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