How to change project unit system in Mechanical?
ExtAPI.DataModel.Project.UnitSystem = Ansys.Mechanical.DataModel.Enums.UserUnitSystemType.StandardNMMton
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/act_ref/item16371481141702352301561761261792319615625321788085127.html