CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Ignition method

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

Like Tree2Likes
  • 1 Post By viji
  • 1 Post By lfgmarc

Reply
 
LinkBack Thread Tools Display Modes
Old   April 28, 2005, 03:43
Default Hello, What is the method i
  #1
New Member
 
Chalothon Thumthae
Join Date: Mar 2009
Posts: 13
Rep Power: 8
thumthae is on a distinguished road
Hello,

What is the method in ignition process of solver XiFoam and engineFoam?

when I run a model with engineFoam and compare result with experiment, pressure from simulation result is rise before the experiment.

Does it mean ignition method in openFoam does not include ignition delay?

and What is "strength" parameter in combustionProperties ?

please give me for suggestion.

Torn
thumthae is offline   Reply With Quote

Old   April 28, 2005, 04:03
Default The best way to understand the
  #2
Senior Member
 
Join Date: Mar 2009
Posts: 854
Rep Power: 13
henry is on a distinguished road
The best way to understand the ignition modelling used in XiFoam and engineFoam is to study the source code and write down the equations being used. You will find everything you need in

OpenFOAM-1.1/applications/solvers/combustion/XiFoam
OpenFOAM-1.1/applications/solvers/combustion/engineFoam
OpenFOAM-1.1/src/engine/ignition
OpenFOAM-1.1/src/engine/include/StCorr.H
henry is offline   Reply With Quote

Old   September 30, 2008, 05:48
Default Dear All Currently I am wor
  #3
New Member
 
Vijayaratnam Piradeepan
Join Date: Mar 2009
Posts: 6
Rep Power: 8
piradeepan is on a distinguished road
Dear All

Currently I am working in XiFOAM.
Please let me know, what the unit of ignition strength in combustion properties is.
Thank you
Vijay
piradeepan is offline   Reply With Quote

Old   February 12, 2009, 04:39
Default hi i am from india i am new to
  #4
New Member
 
pavan
Join Date: Mar 2009
Location: BANGALORE, KARNATAKA, INDIA
Posts: 7
Rep Power: 8
viji is on a distinguished road
hi i am from india i am new to openfoam i am solving methane combustion problem, i am facing difficulty while assigning fields and solving please can u help me... or for reference can u send one combustion solved problem..
apsingh_21 likes this.
viji is offline   Reply With Quote

Old   June 4, 2011, 03:04
Unhappy Ignition points?
  #5
Member
 
lfgmarc's Avatar
 
Luis Felipe Gutierrez Marcantoni
Join Date: Oct 2010
Location: Cordoba-Argentina
Posts: 46
Rep Power: 6
lfgmarc is on a distinguished road
Send a message via MSN to lfgmarc
Hi, maybe one of you can help me, I too want to know the units of the ignition strenght and how I can define more ignition points in the combustion properties ?

best regards



FG
apsingh_21 likes this.
__________________
Felipe G
lfgmarc is offline   Reply With Quote

Old   July 29, 2011, 03:47
Question ignition properties
  #6
New Member
 
M. Timaji
Join Date: Sep 2010
Location: Tehran
Posts: 6
Rep Power: 6
timaji is on a distinguished road
Quote:
Originally Posted by henry View Post
The best way to understand the ignition modelling used in XiFoam and engineFoam is to study the source code and write down the equations being used.

Hi Foamers,
I have read ignite.H and found that bEqn updated to new value:

" bEqn = bEqn + Strength *cellVolume * rhou / duration " for ignite cells.

These anybodys know the perspective on physics of this formula?
Would you please help me on ignition properties e.g. strength, diameter and timing for carbon rod igniter.

Last edited by timaji; August 20, 2011 at 14:54.
timaji is offline   Reply With Quote

Old   June 5, 2013, 13:56
Default
  #7
Member
 
Camille
Join Date: Oct 2012
Posts: 54
Rep Power: 4
camille131 is on a distinguished road
Does anyone know how can I know the quantity of energy involved in the ignition in function of the parameters (strength, duration, ...) ?


I m also looking for an explaination of the meaning of strength

assuming b is a dimensionless number, I thought I could find the unity of strength from the next equation but Im not sure...

Quote:
bEqn = beqn + ((strength * cellVolume * rhou) / duration ) / (b[ignSite] + 0.001)
cellVolume [ m]
rhou [kg/m]
duration [s]
b[ignSite] and bEqn [-]
strength [?]

Then : [-] = [?] *[m]*[kg/m] / [s] --> [?] = [s/kg]

but it means nothing for me physically in this context...

for sur I am wrong but where? maybe rhou is not what I think?

Thank you for your help,
Cam
camille131 is offline   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
Ignition ylime FLUENT 1 March 9, 2010 21:01
Ignition jonathan CFX 0 March 11, 2008 13:53
Spark Ignition Nico Gross FLUENT 0 November 8, 2007 14:07
H2/O2 ignition ??? abel FLUENT 2 June 8, 2006 05:03
Ignition Mgtripple CFX 5 April 23, 2006 15:09


All times are GMT -4. The time now is 05:29.