Fluent reaction- udf problem? I have defined a surface reaction by my udf(it is different from the arrhenius rate) ,and have hooked it in the fluent. But I can't find any change in the reaction panel,that is to say I can't find the reaction rate just defined, there is only a arrhenius reaction rate. 1.Does it has adopt the user defined reation by default or is my mistake? 2.If it has adoptde the udf's rate by default ,then how can I set up the stoich coefficient or there is no need to set up it at all?

Thans in advance !

who can help me

once you have hooked your UDF, then Fluent will take the reaction rate passed by your UDF, it will overwrite the Arrhenius rate passed. If you have hooked in "User Defined Function Hooks" panel, that is enough. Fluent will pass the Stoichiometric Co-eff. which you gave in reaction panel, concentratino of each species to your UDF, thus your UDF will calculate rate of reaction and will return it to Fluent.

Am I answered you.? Best of Luck

Thank you very much!

I will try!

hi sir, i am m.tech student. i am doing my project in fluent. i have my problem regarding "free jet flow problem". i am unable to get flow profile through jet flow in environment in the fluent software. if any body help please reply soon. i am very thankful to u.