Reply To: How to realize the motion that a rigid body moves in an elliptical path?

[Rob]

CG_MOTION is likely a good way of doing it, DEFINE_MESH_MOTION is another. The rotational functions in Fluent are designed for mixers, turbines etc inside another fluid (or casing) rather than eccentric motions. We often use compound systems to rotate components relative to another moving part, but again, those motions are circular. Hence questioning how you plan on causing the motion profile in reality as that can give you ideas on how to model it.