CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Modelling Combustion in Porous Zone

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

LinkBack Thread Tools Search this Thread Display Modes
Old   November 19, 2010, 11:23
Question Modelling Combustion in Porous Zone
New Member
Join Date: Nov 2010
Posts: 2
Rep Power: 0
tanjinjack is on a distinguished road

I am having problems in defining combustion in porous zone and will appreciate any inputs.

I am a student in Malaysia, currently working on a design project. I am assigned in building a simulation model of porous burner. It will consist of a mass flow inlet, which it will enter a porous zone where combustion is ignited. After the porous zone, the temperature will be observed. They are defined into three fluid zone, 'before porous', 'porous zone' and 'after porous'.

Being a beginner in FLUENT and CFD, I find this tough and challenging at the same time as I need to learn two new things - defining porous zone and using a combustion model. BTW, I touched a little bit of CHEMKIN and thus have ideas of the mechanism files etc.

After some studies, I manage to define my porous zone correctly (as I see velocity slowing down) and I found the necessary equations to define the inertial and viscous losses, yet to compute the value I need though.

However, I am having issues with defining the combustion and FLUENT user guide does not help beyond my problem.
I intend to use the pre-mixed combustion model but will take advice on choosing the partially pre-mixed model if necessary.

My problem is that:
  1. I am unsure if I really initiate any combustion. I don't think I came across choosing my fuel and oxidiser, although I tried to define the zones into 'methane'.
  2. However, I observe a change of progress variable. Does that mean combustion actually occurs?
  3. I also try to 'patch' the progress variable so that I think it would only start combustion in the porous zone, but the contour of progress variable (and also product formation rate) does not show that the combustion confines within the porous zone I define. I have then been patching blindly and through trial and error and it doesn't seem I am getting it correct.

Do I miss out anything important? I was reading FLUENT user guide and saw reaction could be defined in porous zone. I think I overlooked it in FLUENT or it isn't there for me to choose from the beginning.
I am away from my university currently and will only be able to access FLUENT by Monday. But certainly, I wish to collect as many ways of doing it as possible now so that I can run it when I reach my university on Monday.

Kindly direct me to any literature that you think might help me. Even if I can't access it from my home, I could grab and read it when I reach my university.

tanjinjack is offline   Reply With Quote

Old   August 31, 2015, 04:56
New Member
Join Date: Aug 2015
Posts: 3
Rep Power: 10
nirmalms90 is on a distinguished road
I facing problem in modelling and simulating premixed porous media combustion in fluent/CFx... It would be really helpful if someone can someone share the procedure to be done for simulation
nirmalms90 is offline   Reply With Quote

Old   September 26, 2016, 04:10
Default Modeling of porous surface burners with Fluent (premixed)
New Member
Join Date: Apr 2016
Posts: 13
Rep Power: 10
iam is on a distinguished road
Dear Nirmal,

I am experiencing problems when modeling porous surface burners too. I would like to model a porous surface model with a premixed methane/air mixture, using a detailed mechanism in order to determine the NOx formation. However, I am experiencing many convergence issues.

Weere you able to find a solution for your premixed porous media?

Thanks a lot for your help,

iam is offline   Reply With Quote


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
porous media combustion zuby FLUENT 2 August 31, 2015 04:42
Problem in IMPORT of ICEM input file in FLUENT csvirume FLUENT 2 September 9, 2009 01:08
combustion in porous media burner zuby ANSYS 0 July 27, 2009 02:26
Question for modelling flow in porous media legendyxg FLUENT 9 April 21, 2009 22:24
cathalytic combustion on a net (porous zone) Mikael FLUENT 0 October 5, 2001 09:00

All times are GMT -4. The time now is 15:03.