Divergence detected in multiphase and multicomponent flow

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  • Last Post 09 August 2019
snr1 posted this 08 August 2019

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.

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rwoolhou posted this 08 August 2019

Try with transient: what flow regime are you expecting?

abenhadj posted this 08 August 2019

To add: if possible use actual versions.

Best regards,

Amine

snr1 posted this 08 August 2019

Bubbly flow sir

snr1 posted this 08 August 2019

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

abenhadj posted this 08 August 2019

FLUENT version. Can you add details about phase interaction?

Best regards,

Amine

snr1 posted this 08 August 2019

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

abenhadj posted this 08 August 2019

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

Best regards,

Amine

snr1 posted this 08 August 2019

abenhadj posted this 08 August 2019

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

Best regards,

Amine

snr1 posted this 08 August 2019

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

abenhadj posted this 09 August 2019

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

Can you try with newer version?

Best regards,

Amine

abenhadj posted this 09 August 2019

Does it run without mass transfer?

Best regards,

Amine

snr1 posted this 09 August 2019

With out mass transfer it works fine

abenhadj posted this 09 August 2019

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.

Best regards,

Amine

snr1 posted this 09 August 2019

Dear sir, what excatly means actual release?

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

abenhadj posted this 09 August 2019

I am referring to using Fluent 2019R2. 

Best regards,

Amine

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