I HAVE IMPORTED A GAS PHASE AND A SURFACE REACTION CHEMKIN MECHANISM in ANSYS FLUENT. There are two zones in this case. one solid and other is for passage of gas. i have set surface mechanism set on wall of solid and gas phase mechanism in gas zone. I have set chemkin mixture as material in gas zone, how should i set solid zone. do i need to define it as a species from chemkin mixture material or i can pick other than from chemkin mixture material?