Today , i have a problem to ask you ....thanks ******************** my model have one mixtures . the mixtures include hydrogen and water vapor and carbon dioxide flow through same channel , i must define condition of inlet in software of Fluent 5.5 {{{Defines\Boundary Condition }}} i only know mole fraction of ideal gas respectively . mole fraction of hydrogen is 0.48 mole fraction of carbon dioxide is 0.16 mole fraction of water vapor is 0.36 mixtures velocity (m/s) is 0.43 Could you tell me how to define them in software of Fluent 5.5 ????? because , this software must be input for mass fraction of other species . *************************** best regards to you and your family kevin

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Sincerely, Jinwook