[cfd kullanıcısı]

Hi,
I am a senior university student. I'm trying to make an analysis about pem fuel cells, which is my graduation project location. I want to do a verification analysis for this but I was not successful. Can you help me with this?
If there is, can you send a sample work?
Thank you in advance for your advice and assistance.

[pakk]

My advice: You will have a better chance if you show your attempts. Show what you tried, show your results, and show what you expected. If there is a mistake, people can help you find it.

[cfd kullanıcısı]

you are right, i couldn't think

My goal is to do a verification study with a reference study, but I haven't been successful yet. I'm uploading my own work, in which part I made a mistake. Can you help me?
I couldn't upload it because the file size is too big. If you give me an e-mail address or I can send it to someone.

[pakk]

If you are trying to upload a cas-file: forget about it. Everybody is too busy to open your file.

Just use words. Type here.
What did you calculate? What was the result? (show a picture or number). What did you expect?

Keep it simple. For example:
-I tried to calculate the heat transfer from liquid to solid.
-the result in Fluent was 555 J/s.
-i expected 35 J/s, because blabla.

Don't overthink this, just start. We will ask questions if we need more info.

[cfd kullanıcısı]

used in reference model

Anode and cathode humidification temperatures are both at 70°C. The operating pressures are 3 atm on both the anode and cathode sides and flow rates are 1200sccm on the anode side and 2200 sccm on the cathode side.

I do not know much about where to use most of the given parameters. As a result of my analysis using the given parameters, I get incompatible results. I want to do a verification study with fuel cell on Fluent pemfc.
Thank you in advance for your advice.

referance model.jpg

referance model result.jpg

[pakk]

Originally Posted by cfd kullanıcısı

As a result of my analysis using the given parameters, I get incompatible results.

I will ask one last time. If you can't answer it this time, I give up.

What did you calculate? What was the result? (show a picture or number). What did you expect?

All you say is that results are incompatible. Please be more helpful. I gave you an example already, just follow that example...

[cfd kullanıcısı]

For example, when I analyze 0.95 open circuit voltage at 0.8 volts, I find the current density as 0.0418 A / cm ^ 2. According to the article, the result seems to be around 0.2. I shared the article results as a picture in the previous answer. the current density I found seems to be quite low compared to the real value. I'll tell you whatever else you need, please don't stop answering. Thank you in advance for your advice.

[AlexanderZ]

if you have no idea about parameters in model, I recommend you to start with any other article, where ansys fluent had been used as a simulation tool.
You may find there all settings, and repeat simulation
for instance https://ieeexplore.ieee.org/document/7455082

[cfd kullanıcısı]

Originally Posted by AlexanderZ

if you have no idea about parameters in model, I recommend you to start with any other article, where ansys fluent had been used as a simulation tool.
You may find there all settings, and repeat simulation
for instance https://ieeexplore.ieee.org/document/7455082

Okay, I will also review this study, thank you for your advice.

[mat16]

Hello,
I am new in Ansys and I am working with the PEMFC module [3] and I do not understand if it is imposed the case in the correct way so I will describe my steps. I made the geometry and mesh, using this article that I am using for validation:

"https://www.sciencedirect.com/science/article/pii/S0895717711006522".

Following some videos on the internet I defined in mesh, for BCs, the external face of the current-collector anode and cathode (terminal-a and terminal-c), the inlet and outlet faces of the channels and the part in contact between the channels and the GDL (porous-jump). After that I started the setup and loaded the pemfc model [3], I activated the energy and the transport of the species (I left by default in options only "Diffusion energy source").

Then the steps I have done are as follows:

-I have entered the data of the reference article, the various zones and the project area in the pemfc module.
-In "Materials" I changed the electrical conductivity of the electrode (sigma catalyst = 100) and of the membrane (sigma_memb = 17.1223)
-I entered the BCs for inlet (V_c_inlet = 2, V_a_inlet = 2, Thermal = 353.15 and water_saturation = 0), outlet (Backflow Reference Frame = Absolute and Gauge Pressure = 0), terminal-a (Thermal = 353.15 and electric_potential = 0) and terminal-c (Thermal = 353.15 and electric_potential = 0.6)
-In "operating condition" the operating pressure of 300000 Pa.
-In "methods" I left the default settings (Simple)
-In "control" I decreased the values ​​of "under-relaxation-factors of the species to 0.5 and energy to 0.6 and the rest by default and in" controls-advance " I considered all F-Cycle, AMG_method = Aggregative and Stabilization_method = BCGSTAB.
-In "Run calculation" I enter the 600 interactions and do the simulation.

The problem is that when I compare the O2 and H2 species with respect to the article I get different results and I don't understand why. It would seem that there is no consumption of the species. (I attach only the comparison image of H2).

Can someone help me?

[IMG][/IMG]
[IMG][/IMG]