# How to simulate PEMFC by CFD (Fluent)?

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 June 23, 2016, 14:59 How to simulate PEMFC by CFD (Fluent)? #1 New Member   Dm Fo Join Date: Apr 2015 Posts: 15 Rep Power: 4 Sponsored Links Dear colleagues, I've just started to simulate PEMFC by Fluent 17.0, and I have some questions about it. So, first of all, Fluent has addon module for PEMFC modeling. I can choose [3] FC and Electrolysis model and/or [9] PEM FC model through TUI console. Which model should I get? What is difference from each other? Secondly, I have a pemfc_user.c. Should I change data in it for boundary conditions definition? Finally, is there any tutorial/guide on PEMFC simulation? Key point I've got is to obtain working (basic) case without any user-defined complex models? Thx

June 25, 2016, 07:03
#2
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Navid
Join Date: Nov 2015
Posts: 6
Rep Power: 3
Here I have uploaded a tutorial for PEM you can use:
You should use [9]PEMFC. the specific materials and models of PEM are set as default in this option.
Quote:
 I have a pemfc_user.c. Should I change data in it for boundary conditions definition?
It depends on the code. you may need to change it to be compatible with the specific definitions of PEM module.

 June 25, 2016, 15:02 #3 New Member   Dm Fo Join Date: Apr 2015 Posts: 15 Rep Power: 4 Thank you for your detailed answer, navidamin! Following this manual, I have an error while case start to calculate. I guess B.C. could be wrong. * iter continuity x-velocity y-velocity z-velocity energy h2 o2 h2o uds-0 uds-1 uds-2 uds-3 uds-4 time/iter V_stack = 0.700000 (V) ... V_open = 1.202589 (V) (single cell) fcu: I_anode = 0.000000 (A/cm^2) ... I_cathode = 513.984313 (A/cm^2) ... dI_mea = -513.984313 (A/cm^2) ... dI_stk = -513.984313 (A/cm^2) 1 1.0000e+00 5.2176e-06 5.2115e-06 1.0626e-01 1.5037e-02 5.2407e-07 1.0161e-06 3.2142e+01 1.2270e-15 2.0960e-02 1.0000e+00 3.3268e+02 6.5911e-03 1:46:08 199 V_stack = 0.700000 (V) ... V_open = 1.188126 (V) (single cell) fcu: I_anode = 0.000000 (A/cm^2) ... I_cathode = -0.000096 (A/cm^2) ... dI_mea = 0.000096 (A/cm^2) ... dI_stk = 0.000096 (A/cm^2) # Divergence detected in AMG for species-0, protective actions enabled! # Divergence detected in AMG for species-0, temporarily solve with BCGSTAB! # Divergence detected in AMG for species-1, protective actions enabled! # Divergence detected in AMG for species-1, temporarily solve with BCGSTAB! # Divergence detected in AMG for species-2, protective actions enabled! # Divergence detected in AMG for species-2, temporarily solve with BCGSTAB! Error: Divergence detected in AMG solver: species-2 Error: Divergence detected in AMG solver: species-2 Error Object: #f How to simulate PEMFC by CFD (Fluent)? - ResearchGate. Available from: https://www.researchgate.net/post/Ho...4854e24b112dd0 [accessed Jun 25, 2016].

 June 25, 2016, 16:01 #4 New Member   Navid Join Date: Nov 2015 Posts: 6 Rep Power: 3 Make sure you have defined the right boundary conditions. Some BCs are not mentioned in the tutorial, you have to find them out yourself. Double check the BCs for all the interfaces.for example: Collector/GDL: Wall Coupled boundary for electrical potential and temperature Channel/gdl: Interior And a very important point: In inket and oulet boundary condition/momentum tab : change the coordinate system to Cartesian and in the three fields below, enter the right directions of inlet and oulet flow. A CFD free user likes this.

June 26, 2016, 08:21
#5
Senior Member

A-A Azarafza
Join Date: Jan 2013
Posts: 215
Rep Power: 7
Quote:
 Originally Posted by navidamin Make sure you have defined the right boundary conditions. Some BCs are not mentioned in the tutorial, you have to find them out yourself. Double check the BCs for all the interfaces.for example: Collector/GDL: Wall Coupled boundary for electrical potential and temperature Channel/gdl: Interior And a very important point: In inket and oulet boundary condition/momentum tab : change the coordinate system to Cartesian and in the three fields below, enter the right directions of inlet and oulet flow.

For those having problems running PEMFC tutorial, the issue is due to the boundary condition as Navid mentioned. And the most important one, the last point.

Thank you Navid
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Regard yours

 February 9, 2017, 07:53 #6 New Member   Vema Sundeep Join Date: Jan 2017 Posts: 6 Rep Power: 2 Can someone please send me the working (.cas file of the PEMFC tutorial) I am stuck for more than 1 month, I am not able to figure out the right boundary equations and coupling conditions. It would be really helpful if you can send me on this email id- vemasundeep95@gmail.com

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