CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

PEMFC model with FLUENT

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree7Likes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 16, 2015, 07:06
Default PEMFC model with FLUENT
  #1
New Member
 
brahim choice
Join Date: Sep 2015
Posts: 3
Rep Power: 7
brahimchoice is on a distinguished road
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,
brahimchoice is offline   Reply With Quote

Old   September 16, 2015, 07:50
Default
  #2
Senior Member
 
Bruno Machado
Join Date: May 2014
Posts: 271
Rep Power: 9
Bruno Machado is on a distinguished road
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.
Bruno Machado is offline   Reply With Quote

Old   September 16, 2015, 11:23
Default
  #3
New Member
 
brahim choice
Join Date: Sep 2015
Posts: 3
Rep Power: 7
brahimchoice is on a distinguished road
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?.
brahimchoice is offline   Reply With Quote

Old   June 26, 2016, 04:56
Default
  #4
New Member
 
Dm Fo
Join Date: Apr 2015
Posts: 15
Rep Power: 7
dmfo is on a distinguished road
I have the same problem with segmentation. Do we solve this error?
dmfo is offline   Reply With Quote

Old   June 26, 2016, 09:14
Default
  #5
Senior Member
 
A CFD free user's Avatar
 
A-A Azarafza
Join Date: Jan 2013
Posts: 226
Rep Power: 10
A CFD free user is on a distinguished road
Quote:
Originally Posted by dmfo View Post
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..
__________________
Regard yours
A CFD free user is offline   Reply With Quote

Old   June 27, 2016, 04:51
Default
  #6
New Member
 
Dm Fo
Join Date: Apr 2015
Posts: 15
Rep Power: 7
dmfo is on a distinguished road
Quote:
Originally Posted by A CFD free user View Post
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?
dmfo is offline   Reply With Quote

Old   June 27, 2016, 04:56
Default
  #7
Senior Member
 
A CFD free user's Avatar
 
A-A Azarafza
Join Date: Jan 2013
Posts: 226
Rep Power: 10
A CFD free user is on a distinguished road
Quote:
Originally Posted by dmfo View Post
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,
sabrina sabi likes this.
__________________
Regard yours
A CFD free user is offline   Reply With Quote

Old   June 27, 2016, 14:59
Default
  #8
New Member
 
Dm Fo
Join Date: Apr 2015
Posts: 15
Rep Power: 7
dmfo is on a distinguished road
Quote:
Originally Posted by A CFD free user View Post
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 is offline   Reply With Quote

Old   June 28, 2016, 02:38
Default
  #9
New Member
 
Dm Fo
Join Date: Apr 2015
Posts: 15
Rep Power: 7
dmfo is on a distinguished road
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 is offline   Reply With Quote

Old   June 29, 2016, 01:42
Default
  #10
New Member
 
Dm Fo
Join Date: Apr 2015
Posts: 15
Rep Power: 7
dmfo is on a distinguished road
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.
Fy_ likes this.
dmfo is offline   Reply With Quote

Old   July 5, 2016, 01:38
Default
  #11
New Member
 
Dm Fo
Join Date: Apr 2015
Posts: 15
Rep Power: 7
dmfo is on a distinguished road
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?
Attached Images
File Type: jpg fluent err.jpg (133.8 KB, 84 views)
ramakant likes this.
dmfo is offline   Reply With Quote

Old   January 8, 2017, 07:01
Default
  #12
Senior Member
 
A CFD free user's Avatar
 
A-A Azarafza
Join Date: Jan 2013
Posts: 226
Rep Power: 10
A CFD free user is on a distinguished road
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
sabrina sabi likes this.
__________________
Regard yours
A CFD free user is offline   Reply With Quote

Old   January 8, 2017, 07:03
Default
  #13
Senior Member
 
A CFD free user's Avatar
 
A-A Azarafza
Join Date: Jan 2013
Posts: 226
Rep Power: 10
A CFD free user is on a distinguished road
Quote:
Originally Posted by dmfo View Post
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
__________________
Regard yours
A CFD free user is offline   Reply With Quote

Old   April 26, 2017, 04:38
Default
  #14
Fy_
New Member
 
YZH
Join Date: Apr 2017
Posts: 8
Rep Power: 5
Fy_ is on a distinguished road
Quote:
Originally Posted by Sundeep View Post
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_ is offline   Reply With Quote

Old   July 23, 2017, 22:59
Default I managed to make it worked
  #15
Fy_
New Member
 
YZH
Join Date: Apr 2017
Posts: 8
Rep Power: 5
Fy_ is on a distinguished road
Quote:
Originally Posted by Fy_ View Post
Hi, I met the same problem, Have you solved it?
doesn't matter, I solved it now.
Fy_ is offline   Reply With Quote

Old   August 3, 2017, 13:07
Default
  #16
New Member
 
Adam
Join Date: Jun 2017
Posts: 3
Rep Power: 5
Davidvia0 is on a distinguished road
Can you say how did u solve it?
Davidvia0 is offline   Reply With Quote

Old   August 21, 2017, 05:32
Default
  #17
Fy_
New Member
 
YZH
Join Date: Apr 2017
Posts: 8
Rep Power: 5
Fy_ is on a distinguished road
Quote:
Originally Posted by Davidvia0 View Post
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.
Fy_ is offline   Reply With Quote

Old   January 4, 2018, 08:55
Thumbs up
  #18
New Member
 
Sakarya
Join Date: Jan 2018
Posts: 1
Rep Power: 0
kanahmet is on a distinguished road
Hi.
I have some problem like cp is invalid
You must change discretization method as Coupled. Now The analysis is running.
sabrina sabi likes this.
kanahmet is offline   Reply With Quote

Old   January 26, 2018, 13:32
Default need help about simulation solid oxide fuel cell
  #19
New Member
 
sabrina
Join Date: Jan 2018
Posts: 18
Rep Power: 4
sabrina sabi is on a distinguished road
Quote:
Originally Posted by A CFD free user View Post
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 is offline   Reply With Quote

Old   February 2, 2018, 18:21
Default
  #20
New Member
 
sabrina
Join Date: Jan 2018
Posts: 18
Rep Power: 4
sabrina sabi is on a distinguished road
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
sabrina sabi is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Seeking Macroscopic Particle Model in Fluent bzhang7 FLUENT 2 July 31, 2020 05:58
How to create a 3Ds Car Model importing to FLUENT? spysunny Main CFD Forum 1 January 11, 2012 00:40
Why is Fluent unable to deal with my model at the micron scale? dixylo FLUENT 4 December 9, 2011 00:39
Fluent 12 k-w SST turbulence model DarrenC FLUENT 0 December 13, 2009 09:33
Covert Star-CD model to FLUENT Lam Siemens 6 June 24, 2003 21:21


All times are GMT -4. The time now is 12:53.