Today , i would like to simulate two mixtures that flow through the different channel respectively . First mixture(include hydrogen ,water-vapor)flow in top channel. second mixture (include oxygen , water-vapor , nitrogen)flow in below channel . but two channel contact together . the surface area is wall between top channel and below channel . i want to ask how to defined the order of react of species(total four species )inside in Fluent 5.5 solver. Defines/Materials/Mixtures species panel

You should define at least 5 species.

H2O, N2, O2, H2, CO2

Maybe you should define more specises for intermediate species.

For one step reaction model, you can refer the reaction parameters from the

DEFINE --> MATERIAL --> DATABASE --> 'MIXTURE MATERIALS, Hydrogen-Air --> REACTION MODEL --> VIEW

It's fairly simple one-step reaction model.

And you can also use 'MF(Mixture Fraction)/PDF Model.

For more information, I think that you should study, because it's fairly difficult to fully explain the modeling strtergy of combustion simulation because combustion itself is fairly difficult.

Sincerely, Jinwook

Sorry, you don't need CO2.

Sincerely, Jinwook