Rob
Forum Moderator

Click on Help in Fluent and then copy the link into the browser. The documentation is not "public" in that it's for users only, so the solvers have a token/cookie/biscuit to bypass the log in page. 

The large bubble drag is corrected based on the phase interaction options from the phase bubble size - they'll be covered in the theory guide. Multiphase is deceptively easy to switch on, but then rather more difficult to understand.