Diffusion of gas in Air

FAKHREDDINE · July 18, 2016, 20:23

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

Difusion.JPG

evcelica · July 19, 2016, 15:56

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.

July 18, 2016, 20:23	Diffusion of gas in Air	#1
FAKHREDDINE Member Yuva Join Date: Oct 2015 Location: Korea Rep of Posts: 33 Rep Power: 10	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 Difusion.JPG

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July 19, 2016, 15:56		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	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.