Could anyone suggest, for diesel engine combustion simulation which mechanism is better?: 1 step or 3 step EBU model, and why? As I think, 3-step mechanism allows tracking of H2 which can be responsible for generating OH radicals. Like H2+O=OH+H and OH+H2=O2H+H. And usually looking at OH concentration flame structure can be determined. Can this be done in Star-CD?

Any comments would be appreciated

Regards

You have to keep in mind that you need to define your (empirical) constants A and B for each step in the EBU model, i.e. you have to tune your model to produce the right results. This is not too difficult for 1 step, but I could imagine that you can produce quite easily meaningless results with a 3-step mechanism.

I am not sure if the EBU model is the right tool to calculate the intermediate species in a combustion. you are probably better off with one of the higher reaction models.