Karthik R
Hello,nYou can split the nozzle and the ambient air region in SpaceClaim. Once you do this, you will have two surfaces. After this, you can create two 'Named Selections' for these surfaces in WB Meshing. When you read this mesh in Fluent, you will have two cell zones (exactly like in the example).nI hope this helps.nThank you.nKarthikn