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

Patch for stoker!!

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 6, 2008, 17:30
Default Patch for stoker!!
  #1
cecillia
Guest
 
Posts: n/a
Hi there:

Since in FLUENT, the air temperature should be really high, which is different with the reality, I used patch on my case.

I tried this on 2D chamber model first. There is only one fluid zone in my case, which is the space inside the chamber wall. I set the temperature of the zone as 1500K. But there is no combustion at all.

Did some use patch before? How can I make it work?

Thank you for your time!

Cecillia
  Reply With Quote

Old   June 9, 2008, 13:34
Default Re: Patch for stoker!!
  #2
Allan Walsh
Guest
 
Posts: n/a
My experience is that the patch works fine. Of course you can easily verify this by patching in some value and then looking to see that the patch has been applied.

From the forum, it seems that you have quite a few issues. Modeling coal and biomass combustion is relatively complicated and it is probably unreasonable to throw everything into a model and expect it to work. You should start off with something simpler, get it to work, and then add one more thing. In this way, you can build up to a more complex model.

I assume that you have already run through the coal combustion tutorial. How is your case different than the tutorial? Is the fuel going in? Is it volatilizing? What is the concentration of the volatiles species? Is there an oxidizing species? How do you have your reactions set-up? If you have a stoker grate, how are you defining the introduction of the fuel?

This should get you started. Good Luck.
  Reply With Quote

Old   June 9, 2008, 18:55
Default Re: Patch for stoker!!
  #3
cecillia
Guest
 
Posts: n/a
Hi Allan:

Thank you so much for the help and suggestions!! Since I am the only student doing CFD of combustion here, it is so great to talk with people in this forum!!

I run through the tutorial: non-premixed combustion model, simulated a 3D stoker boiler with coal combustion and had some reasonable results. I defined the coal by exactly following the tutorial.

My present work is to inject biomass into the boiler from different nuzzles.

Now I found out how to define different fuels with the help from the forum. I guess I should define the fuel in the species panel as a mixture of both coal and biomass in certain ratio, right?

Thank you for your time!!
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
HELP NEEDED HOW TO MAP VALUES FROM PATCH OF ONE MESH TO PATCH OF ANOTHER MESH mkraposhin OpenFOAM Running, Solving & CFD 3 September 4, 2011 09:42
patch value laure FLUENT 0 June 6, 2007 10:14
VOF Patch Adour FLUENT 0 April 5, 2007 05:01
patch lu FLUENT 2 September 4, 2003 03:48
Patch Eric FLUENT 5 December 1, 2000 11:14


All times are GMT -4. The time now is 16:56.