Hello Veronique,
Hyperthreaded cores are not supported by Ansys applications and will not provide performance boost. You have 20 physical cores, which is the max number of cores the applications will use.
Refer 3.1.3 - https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/licensing/HPC_detail.html?q=physical%20core
Refer - https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/ans_dan/dan_onProcThreCore.html?q=physical%20core
You are navigating away from the AIS Discovery experience