@Engin.Taze, there is another post here that might be helpful: Mulit-Process environment for FastV8 - #10 by Puyi.Yang. Running a single simulation in parallel is limited and cannot be done for a full OpenFAST simulation (only for OLAF and FAST.Farm). Running multiple simulations however is certainly possible. I am tagging my colleague @Will.Wiley, who can give you better guidance on this.