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

Combustion in a closed System

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 19, 2007, 00:00
Default Combustion in a closed System
Martin Castillo
Posts: n/a
Hello Everyone,

(Sorry the last post was difficult to read so I am posting again.)

I am new to Fluent and have been doing some modeling recently. I am studying the combustion of air and hydrogen in a closed chamber. My 2-D mesh looks like a donut with an inner radius of .3mm and outer of 50mm and this has been cut in half for symmetry purposes. I am having trouble modeling in a closed chamber and hope you can help me out. There was a bit of information given on 2004 by someone with the name of Jim (Combustion in a closed system, Posted By: Jim, Date: Mon, 6 Dec 2004, 12:10 p.m.). I would like to start my combustion of the gas at the small inner diameter "hot-wire". This surface should be somewhere from 875 to 1300 deg C. I have done the following procedure to accomplish this and then at the end I am unable to define the temperature of the hot-wire and chamber wall.

 File->Read Case->2d chamber 05.msh

 Grid->Check

 Grid->Scale->mm->Scale->Close

 Define->Models->Solver->Time->Unsteady->Ok

 Define->Models->Radiation->P1->Ok->Ok to the warning

 Define->Models->Viscous->K-epsilon(2eqn)->OK

 Define->Models->Species->Premixed Combustion->Apply->Ok to the warning->Ok

 Define->Materials->Fluent Database->Then I picked out air and hydrogen->changed absorbtion coefficient to 10 for both of them and each time clicked on Change/Create->Close

 Define->operating conditions->Checked Gravity->Y=-9.8->ok

 Define->Boundary Conditions->Hot Wire->###Can't define temperatures here###

Any ideas suggestions are appreciated. If you need further information please email me at

Thanks, Dr. Martin Castillo

  Reply With Quote

Old   June 19, 2007, 02:33
Default Re: Combustion in a closed System
Martin Castillo
Posts: n/a
Sorry, I believe that you have to move out of the Adiabatic regime to the Non-Adiabatic regime.
  Reply With Quote

Old   June 20, 2007, 09:33
Default Re: Combustion in a closed System
Posts: n/a
Did you enable the energy equation?
  Reply With Quote

Old   June 20, 2007, 22:38
Default Re: Combustion in a closed System
Martin Castillo
Posts: n/a
Hello Neil, Thanks for your fast response. The energy equation was automatically enabled by the radiation model and changing the parameter to non-adiabatic conditions. Just to be safe, I did go back and make sure it was enabled. My main mistake was not enabling non-adiabatic conditions. Thanks for your help. -Martin
  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
CFX11 + Fortran compiler ? Mohan CFX 20 March 30, 2011 19:56
closed system memahfud CFX 4 July 15, 2009 06:06
Incompressible Ideal Gaz in a closed system - Help JB FLUENT 2 August 1, 2008 05:16
Combustion in a closed System Martin Castillo FLUENT 0 June 18, 2007 23:56
Combustion in a closed system. Jim Main CFD Forum 7 December 9, 2004 14:49

All times are GMT -4. The time now is 12:24.