I want to make 2D simulation over an airfoil to see transonic regimes. I will use four different mach number (inlet velocity) to achieve this goal. I am using comressible k omega SST tubulance model for it. My problem is to create meshing geometry. I have 3D cad data for the airfoil and tried to make enclosure on this airfoil in order to use in meshing . I do not think I make it right so I started all over and created backgorund mesh box (with 0.02 z value) on the airfoil. But it is still 3D not 2D. How can I make meshing correctly?