Floating point error in PEMFC Simulation

KBVS · July 2, 2022, 02:54

Hi,
I am trying to replicate a fuel cell model which is simulated in ANSYS Fluent but I am constantly getting floating point error.
I used the tutorial model as my base reference and build the set-up.
errors like: "A non-finite residual (H2O) was added by star.segregatedspecies.SegregatedSpeciesSolver. and causing overflow, underflow or divided by Zero"

I have attached Parameters and error occurred can you help me solve this problem
thank you

amhams22 · July 11, 2023, 23:51

I have the same issue, that would be great if somebody assist :

in general, I am fixing this problem with these steps:
1-Your mesh is set to CFD, fluent and NOT mechanical
2- Your mesh should have at least a good skewness and orthogonal array value
3- you have unstructured mesh, with tringles arrangement
4-your mesh should show all the bodies of your geometry without cuts
5-If it did not initialize properly, reset the setting and do it again
6- for transient application, take PISO as your method
7- your timesteps must be less than 0.005
Finally, the real setup that really can solve this problem in the dynamic mesh is to activate
Implicit Update Settings

Unfortunately, it was not helpful here for me but you can try it as well!

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July 11, 2023, 23:51		#2
amhams22 New Member Ontario Join Date: Sep 2022 Posts: 1 Rep Power: 0	I have the same issue, that would be great if somebody assist : in general, I am fixing this problem with these steps: 1-Your mesh is set to CFD, fluent and NOT mechanical 2- Your mesh should have at least a good skewness and orthogonal array value 3- you have unstructured mesh, with tringles arrangement 4-your mesh should show all the bodies of your geometry without cuts 5-If it did not initialize properly, reset the setting and do it again 6- for transient application, take PISO as your method 7- your timesteps must be less than 0.005 Finally, the real setup that really can solve this problem in the dynamic mesh is to activate Implicit Update Settings Unfortunately, it was not helpful here for me but you can try it as well!