[brahimchoice]

Hi, I used the tutorial form Fluent for PEMFC :"Tutorial: Modeling a Single-Channel, Counter-Flow Polymer Electrolyte Membrane (PEM) Fuel Cell ", after complete the geometry and the mesh with Gambit and setup Fluent, the calculation halt with issues as "segmentation signal fault, error of convergence, etc.", need help to understand in the Tutoria model of PEMFC really works.
Sincerelyn,

[Bruno Machado]

The tutorial works. The segmentation fault error happens when there is some missing information (boundary condition, variables not properly defined in case you used UDF, etc.). Check is all information need is provided and the segmentation fault should be gone.

[brahimchoice]

I still have issues to run the tutorial. this is the mesh that I used and the the fluent case data. is there a way to have a working EPMFC model to download?.

[dmfo]

I have the same problem with segmentation. Do we solve this error?

[A CFD free user]

Originally Posted by dmfo

I have the same problem with segmentation. Do we solve this error?

Hi Friend,
Please, be in contact to me for your problem by providing more details..

[dmfo]

Originally Posted by A CFD free user

Hi Friend,
Please, be in contact to me for your problem by providing more details..

I will try to replicate tutorial of PEMFC another one time. First of all, in Fluent 17 (which I use), as well as 16 and 15 versions, I can choose [3] FC and Electrolysis model or [9] PEM FC model. Which model does correspond to tutorial''s model? And what is the difference between them?

[A CFD free user]

Originally Posted by dmfo

I will try to replicate tutorial of PEMFC another one time. First of all, in Fluent 17 (which I use), as well as 16 and 15 versions, I can choose [3] FC and Electrolysis model or [9] PEM FC model. Which model does correspond to tutorial''s model? And what is the difference between them?

Hi,

The PEMFC model is for the tutorial. FC, and electrolysis corresponds to solid oxide fuel cell and electrolyser (SOFC&SOEC).

Regards,

[dmfo]

Originally Posted by A CFD free user

Hi,

The PEMFC model is for the tutorial. FC, and electrolysis corresponds to solid oxide fuel cell and electrolyser (SOFC&SOEC).

Regards,

I tried to create new model.
Finally, following to tutorial I have new error like this:

iter continuity x-velocity y-velocity z-velocity energy h2 o2 h2o uds-0 uds-1 uds-2 uds-3 time/iter
V_cell = 0.750000 (V) ... V_open = 1.183261 (V)
I_anode = 0.182809 (A/cm^2) ... I_cathode = 0.520703 (A/cm^2) ... dI_mea = -0.337894 (A/cm^2) ... dI_stk = -0.337894 (A/cm^2)
1 1.0000e+00 1.0031e-01 9.9029e-01 8.3462e-01 2.5701e+04 0.0000e+00 9.7376e-02 6.1092e-02 8.7309e-12 7.1504e-01 1.0059e+00 1.2889e-07 0:34:19 99
# Divergence detected in AMG for temperature, protective actions enabled!
# Divergence detected in AMG for temperature, temporarily solve with BCGSTAB!
# Divergence detected in AMG for uds-2, protective actions enabled!
# Divergence detected in AMG for uds-2, temporarily solve with BCGSTAB!
# Divergence detected in AMG for uds-3, protective actions enabled!
# Divergence detected in AMG for uds-3, temporarily solve with BCGSTAB!
Warning: Invalid cp (0.000000e+00 J/kgK) for hydrogen at temperature -1.#IND00 K
V_cell = 0.750000 (V) ... V_open = 1.163195 ... 1.181110 (V)
I_anode = 0.175428 (A/cm^2) ... I_cathode = 0.067200 (A/cm^2) ... dI_mea = 0.108228 (A/cm^2) ... dI_stk = 0.108228 (A/cm^2)

Divergence detected in AMG solver: species-0
Divergence detected in AMG solver: species-1
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-0
Divergence detected in AMG solver: uds-1
Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: uds-3
Divergence detected in AMG solver: species-0
Divergence detected in AMG solver: species-1
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-0
Divergence detected in AMG solver: uds-1
Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: uds-3
Divergence detected in AMG solver: species-0
Divergence detected in AMG solver: species-1
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-0
Divergence detected in AMG solver: uds-1
Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: uds-3
reversed flow in 420 faces on pressure-outlet 100.

reversed flow in 420 faces on pressure-outlet 101.

Divergence detected in AMG solver: species-0
Divergence detected in AMG solver: species-1
Divergence detected in AMG solver: species-2
Divergence detected in AMG solver: temperature
Divergence detected in AMG solver: uds-0
Divergence detected in AMG solver: uds-1
Divergence detected in AMG solver: uds-2
Divergence detected in AMG solver: uds-3
Error at Node 3: floating point exception

Error at host: floating point exception

Error at Node 0: floating point exception

Error at Node 1: floating point exception

Error at Node 2: floating point exception

Error: floating point exception
Error Object: #f


All steps I screened to file, which you can download - https://yadi.sk/i/_oLMVuzbsq6YX

[dmfo]

Strange error:
Warning: Invalid cp (0.000000e+00 J/kgK) for hydrogen at temperature -1.#IND00 K
While initialization T=343 K, cp_H2 must be calculated.

[dmfo]

It seems I've tried all model's setting, but result is the same - error. Can someone share your own correct fluent model of pem or model from tutorial? I couldn't understand what is wrong in my model.

[dmfo]

I have create new pemfc model with coarse mrsh. During calculating both I_anode and I_cathode equal to 0. Finally, calculation is collapsed. Somebony know what has happened?

[A CFD free user]

The issues can arise from different sources. Mesh quality is very important, especially in through-plane direction (y direction in default). One important thing that I experience ever which makes the anodic and cathodic current density zero, is the correct modeling of the surface between the flow channels and GDL. In some cases when you do not observe the rules correctly, you might have created the mentioned surfaces as wall unintentionally. Any possible mistake in splitting the volume would result in such a flaw. Check the surfaces carefully to be ensured that the flows pass through the surfaces into the GDL layer. This was the main reason that I would receive zero current in calculations.

I hope it helps
Abouzar

[A CFD free user]

Originally Posted by dmfo

I have create new pemfc model with coarse mrsh. During calculating both I_anode and I_cathode equal to 0. Finally, calculation is collapsed. Somebony know what has happened?

The issues can arise from different sources. Mesh quality is very important, especially in through-plane direction (y direction in default). One important thing that I experience ever which makes the anodic and cathodic current density zero, is the correct modeling of the surface between the flow channels and GDL. In some cases when you do not observe the rules correctly, you might have created the mentioned surfaces as wall unintentionally. Any possible mistake in splitting the volume would result in such a flaw. Check the surfaces carefully to be ensured that the flows pass through the surfaces into the GDL layer. This was the main reason that I would receive zero current in calculations.

I hope it helps
Abouzar

[Fy_]

Originally Posted by Sundeep

Hi!

Have you solved the problem? If yes, please send me your .cas file to vemasundeep95@gmail.com, I am stuck in a similar problem for more than 2 weeks now.

Please help me.

Hi, I met the same problem, Have you solved it?

[Fy_]

Originally Posted by Fy_

Hi, I met the same problem, Have you solved it?

doesn't matter, I solved it now.

[Davidvia0]

Can you say how did u solve it?

[Fy_]

Originally Posted by Davidvia0

Can you say how did u solve it?

Firstly, you should choose double precision in the Fluent Launcher.

Secondly, when you check the mesh after reading it, you will notice the WARNING in the console and do what the console told you which as the followed:

"Please select /solve/initialize/repair-wall-distance
using the text user interface to switch to the
alternative algorithm."

Thirdly, check the mesh again, it will okay without WARNING.

[kanahmet]

Hi.
I have some problem like cp is invalid
You must change discretization method as Coupled. Now The analysis is running.

[sabrina sabi]

Originally Posted by A CFD free user

Hi,

The PEMFC model is for the tutorial. FC, and electrolysis corresponds to solid oxide fuel cell and electrolyser (SOFC&SOEC).

Regards,

please send to me tutorial about model solide oxide fuel cell this is my émail:sabrina.sabi2005@gmail.com

[sabrina sabi]

please help me about this tutoriel i am begein work about this but i don't now how choose the boundry condition can you send it to me please urgent