2 different gases analysis

[ak-kun]

hello, i am newbie in this analysis world.So, i am hoping that anyone out there can help me.

I want to do some analysis about the flow of 2 different gases on one flow using CFD.

The gas will enter from 2 different inlet and will be mixed at one point.I want to analyze the mixed gas flow effect.

the problem is I'll try to set the material to 2 different gases but it cant be solved.

How can i change the setting so the problem can be solved?or is it any other way to solve it?

Thank you in advance. 

[marco.mueller]

http://wikihelp.autodesk.com/Simulation_CFD/enu/2013/Help/0407-Learning407/0726-Guidelin726/0751-Sca...