Have a look here, https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v232/en/flu_ug/flu_ug_sec_dynamic_using.html You'll need to control the motion using 6DOF (1DOF) and remesh using layering. There are some examples in the wider Help, and if you look for the incylinder models (car engines) you'll get more tips.
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