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One transport equation, two user-defined scalar, can it be solved?

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Old   April 1, 2014, 22:18
Default One transport equation, two user-defined scalar, can it be solved?
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Dongyue Li
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Hi guys

Im working on OPOSPM of PBM. This PBM solving method is very simple. As the article said:

Therefore, for the solution of PBM in CFD, only one additional transport equation for the total number concentration is needed. This equation is introduced into Fluent as a user-defined scalar. The simple source term is written as a user-defined function and added to the transport equation.
I uploaded this equation(see the attached). Right now I have one transport equation, but I have two unknown quantities: N_d, d_30 or m_0.

In the article it said:
m_0 is included as a user-defined scalar in FLUENT.
So I think it have two unknown quantities and one transport equation. I think it is unsolvable.

More details see this article, am I misunderstand it?

Any comments are welcomed.
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