This will help you set up appropriate inputs, and sanity check your results when your gut tells you there is something wrong.
However, our first piece of advice is that, in order to identify the root cause of the problem, aim to make one deliberate change at a time. Naturally, when you start the troubleshooting process, you may already have a suspicion about the cause of your issue - so you may find yourself checking a few parameters, making multiple changes and then re-running/reviewing results. If you are also interested in seeing a “geometry and meshing” tips and tricks checklist, please let us know in the comments. This checklist will focus on the Ansys Fluent CFD solver, however, we often start by reviewing the geometry and mesh. You can learn more about the experience of LEAP's CFD team here. Our CFD support engineers work systematically with our customers to help troubleshoot any simulations that are not behaving as expected – and here we felt it would be helpful to document this ‘mental checklist’ which we often use to tackle challenging problems (in the hope that it will help you, also!). Engineers at LEAP work daily to support and provide advice to a mix of OEMs, engineering consultants and all the major universities around Australia and New Zealand.