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

Single flamelet extinguished error from chemical reaction problem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 16, 2012, 04:50
Default Single flamelet extinguished error from chemical reaction problem
  #1
New Member
 
Jenny
Join Date: Jan 2012
Posts: 11
Rep Power: 5
Jenny_Wong is on a distinguished road
Hi Everyone,
I'm trying to set up a chemical reaction case in FLUENT. It is a single step irreversible reaction of HCl and NaOH (both are liquid). I have created CHEMKIN Mechanism file and Thermodynamic Database file. The reaction data I wrote is:

ELEMENTS
H O NA CL
END
SPECIES
NACL NAOH HCL H2O
END
REACTIONS
NAOH + HCL => NACL + H2O 2.81E-10 0.0 0.0
END

I use non-premixed combustion and steady flamelet model. I am able to load both reaction and thermodynamic files but when I click create flamelet option, FLUENT reports this error:
"Single flamelet extinguished. Try again with lower Scalar Dissipation"

I try reducing the initial scalar dissipation to a very lower number but still, it does not work.

I do not know what is wrong. Can anyone give me some advice/suggestion on how to solve this problem, please? Thank you very much.

Regards,
Jenny
Jenny_Wong is offline   Reply With Quote

Old   March 17, 2012, 06:36
Default
  #2
New Member
 
Graham
Join Date: Apr 2009
Posts: 7
Rep Power: 8
cguy is on a distinguished road
The flamelet solver in Fluent checks for heat release to ensure that the flamelet has not extinguished (ie the max temp > boundary temp). Can you give your chemistry some exo-thermistry? (ie lower formation enthalpy of products)
cguy is offline   Reply With Quote

Old   March 17, 2012, 08:01
Default
  #3
New Member
 
Jenny
Join Date: Jan 2012
Posts: 11
Rep Power: 5
Jenny_Wong is on a distinguished road
Dear Cguy,
Thank you very much for your reply. I don't know how to give my chemistry exo-thermistry or lower product formation enthalpy. Could you please give me some ideas?
Best wishes,
Jenny
Jenny_Wong is offline   Reply With Quote

Reply

Tags
chemical reaction, chemkin, flamelet, reacting flow, reaction mechanism

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
chemical reaction modeling using FLUENT wlt_1985 FLUENT 6 April 16, 2014 07:45
CFX5.7 - chemical reaction problem... H.L. CFX 4 March 25, 2009 11:33
Ansys CFX10: multiphase reaction heat problem CFDS CFX 1 September 20, 2006 23:09
Specifying a chemical reaction hagupta CFX 3 March 22, 2006 02:46
chemical reaction - decompostition La S. Hyuck CFX 1 May 23, 2001 00:07


All times are GMT -4. The time now is 16:00.