Reply To: How to simulate an object moving by fluid flow inside a pipe system?

[Rob]

There's the moving mesh tutorial in Fluent's Help using overset. You'd need to add in the contact (collision) detection, and that's covered in the UDF manual   https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v241/en/flu_udf/flu_udf_DynamicMeshDEFINE.html%23flu_udf_sec_define_contact

Otherwise, I'm not aware of examples and the cases I've had passing involvement with are all confidential.