CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

reactingFoam with Gri-Mech 3.0: No combustion happening

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

Like Tree2Likes
  • 2 Post By a_slow_old_man

LinkBack Thread Tools Search this Thread Display Modes
Old   January 6, 2017, 06:12
Question [Solved] reactingFoam with Gri-Mech 3.0: No combustion happening
New Member
Join Date: Dec 2015
Location: Germany
Posts: 25
Rep Power: 9
a_slow_old_man is on a distinguished road
Solved: Use more heat.

Hello cfd-online community,

I am working on my bachelors Thesis and part of it is evaluating different reaction mechanisms for methane combustion.

I used the reactingFoam tutorial counterflow flame Case (../tutorials/combustion/reactingFoam/ras/counterFlowFlame2D) to test a global 1-Step, 2-Step, 4-Step and GRI-Mech 3.0 reaction.

With the tutorial 1-Step Case I get the typical flamefront, reaction, and species-fraction along the axis as expected.

Using the adjusted reaction rates described in "Simplified Reaction Mechanisms for the Oxidation of Hydrocarbon Fuel in Flames"
by C.K. Westbrook and Frederick. L. Dryer to determine the activation energy and pre-exponential factor for my own 1-Step, 2-Step, 4-Step reaction or using the GRI-Mech 3.0 reaction I dont have a reaction. There is a slight rising in temperature but this also accurs in a case with combustion and reaction turned off. Even when increasing the inlet temperatur of air and fuel to 1000K (Autoignitionpoint of Methane 810K according to wikipedia) I have no real reaction.

Am I missing something obvious? Why is there no reaction?

Trying the same values (with k-Epsilon turbulence model) on a piloted flame Case [similar to Sandia Flame D but a little sloppy] I have the same problem. Using the 1-Step combustion from the tutorial Case it works, with GRI-MECH 3.0, just a very small region of reaction very close to the inlet.

I am attaching the pilotedFlame and CounterflowFlame case of my GRI-MECH 3.0 Cases.

If anyone finds my error or had this problem before, please tell me. I am at a loss as to why this is happening, or rather... not happening.

EDIT: I solved my problem by using the highly scientific method of using way more heat.

Applying 1200K at both air and fuel inlet finally gave me the desired reaction profile. A external ignition via fvOptions also worked.
Attached Files
File Type: zip (178.6 KB, 84 views)
File Type: zip (96.1 KB, 71 views)
luonghungtruyen and maziar77 like this.

Last edited by a_slow_old_man; January 8, 2017 at 06:15. Reason: Solved the problem
a_slow_old_man is offline   Reply With Quote


combustion, counterflowflame, gri-mech 3.0, reactingfoam, reaction

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
reduced version of GRI 3.0 Mechanism buxtsued FLUENT 11 August 7, 2018 15:50
How to switch off combustion and reaction in reactingFoam shenzhou1987 OpenFOAM Running, Solving & CFD 16 October 26, 2017 16:31
reactingFoam: how do we add more combustion products to reactions in combustion? rewol OpenFOAM Pre-Processing 0 August 10, 2015 15:07
Flamelet with GRI 3.0 Pat84 FLUENT 1 February 15, 2013 13:11
Constant Volume Combustion with reactingFoam Alish1984 OpenFOAM Running, Solving & CFD 2 May 8, 2011 09:51

All times are GMT -4. The time now is 23:37.