One transport equation, two user-defined scalar, can it be solved? -- CFD Online Discussion Forums

April 1, 2014, 23:18

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

sharonyue

Senior Member

Dongyue Li

Join Date: Jun 2012

Location: Beijing, China

Posts: 849

Rep Power: 18

Hi guys

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

Code:

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:

Code:

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?

http://pubs.acs.org/doi/abs/10.1021/ie901411e

Any comments are welcomed.

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