Sampat Kumar
Ansys Employee

Hi Samuele, 
If you try to provide the rotational velocity by right-clicking on the static structural, then this rotational velocity will give the result of the structural effect of a part spinning at constant velocity. you may also see this to use the fixed rotation and see if it would be helpful or not in your case. 
I have attached the link that you can follow. 

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/wb_sim/ds_FixedSurfaceRotation_Support.html


Regards, 
Sampat