June 16, 2023 at 2:18 pm
C N
Ansys Employee

Hello Lukas,

I recommend checking your boundary conditions . Can you please share the set up screenshots for further information. I am attaching a best practice video link for dynamic mesh of piston similar to your case so you check the dynamic mesh settings. 

(40) ANSYS Fluent: Dynamic Mesh Problem for a Piston and Reed Valve Part II - YouTube

(40) ANSYS Fluent: Dynamic Mesh Problem for a Piston and Reed Valve - Part I - YouTube

I hope this helps you solve the problem.

Thanks,

Chaitanya Natraj