Diffusion of gas in Air
 

Hello

I need some advises about my case please

I want to simulate the diffusion of naphthalene vapor into Air at 25 C

I am setting one inlet from one side of the air and another inlet of the
naphthalene vapor from another side and one outlet

1 - I don't know why the solver fail after 13 iterations ?

2 - I would like to simulate the transient case for this problem, but I have no experience with that, what should I do ?

I hope you can help me with the above, I know that CFX community guys are very smart and experienced ... :)

Thank you

Best Regards

Attachment 49246

There could be many reasons why it would fail. What time step size are you using? Try a smaller one. What is you RMS courant number? aim for about 1 or lower as a general guideline to get you in the right ballpark.