Learning Forum

[snr1]

Dear sir, i am simulating the absorption process in Fluent 18.1. The geometry is as follows.

I am using steady state solver with Eulerain Implicit model and species transport model (spcies mass transfer model). As the run calculation is started, immediately it is diverging and giving floating point exception. How to get resolve this issue. The error is shown below.

[Rob]

Try with transient: what flow regime are you expecting?

[DrAmine]

To add: if possible use actual versions.

[snr1]

Bubbly flow sir

[snr1]

What actual versions mean? I didn't get sir. Can you elaborate it further?

[DrAmine]

FLUENT version.
Can you add details about phase interaction?

[snr1]

phase interaction:

1. virtual mass: Default

2. Drag: schiller-Naumann

3. Lift, wall lubrication, Turbulent dispersion, and Heat: None

4. Mass: Species mass transfer model

5. Reactions: none

6. Surface tension: constant

7. Interfacial area: ia-symmetric

[DrAmine]

Disable all forces keep drag. Screenshot of mass transfer panel.

[snr1]

[DrAmine]

Make mass transfer from liquid solution to gas and adjust resistances accordingly.

[snr1]

Yes sir i have tried that also, but has resulted the same.

[DrAmine]

What about assuming a resistance on the bubble sides instead of zero-resistance, does it help?

Can you try with newer version?

[DrAmine]

Does it run without mass transfer?

[snr1]

With out mass transfer it works fine

[DrAmine]

That confirms that I was thinking.

1/Try transient with small time step size

2/Please try to run with actual release and let us know.

[snr1]

Dear sir, what excatly means actual release?

Time steps i have tried are: 1e-4 anf 1e-6. But still results same

[DrAmine]

I am referring to using Fluent 2019R2.