|
[Sponsors] |
December 10, 2012, 07:16 |
how to set a fire
|
#1 |
New Member
Mohamed
Join Date: Nov 2012
Posts: 11
Rep Power: 13 |
I want to set a fire with methane
I have a room 2 x 2 x 2 m, methane CH4 entered from the center of the bottom by a nozzle (0.25 x 0.25) at speed of 9 m/s and 1000K to ignite. as a velocity inlet with 0.3 CH4 and 0.22 O2 I made species transport, volumetric and finite rate/eddy dissipation using methane-air mixture, inlet diffusion, and diffusion energy source Also i use interaction with continuous phase, and update dpm sources every flow iteration(30) to have lagranrian model. There are 4 windows (each of 125x 500 mm), 2 Pressure inlet and 2 pressure outlet with 0.23 O2 at 300 K Sometimes it shows divergence in species 1 or Temperature, Other times after calculation it shows no (zero) Co2 or H2o which means that no combustion took place. Please tell me how to proceed Another thing, I need to reach a stable flame, so shall i make it stable from the begining, or make it transient and calculate till it reaches stable values. Thanks Last edited by Bido14; December 11, 2012 at 06:55. |
|
January 2, 2013, 21:36 |
|
#2 |
Member
Yanlong Li
Join Date: Jan 2013
Location: BeiJing
Posts: 47
Rep Power: 13 |
There is a fire starting in my heart...........
|
|
January 3, 2013, 01:50 |
|
#3 |
Senior Member
SSL
Join Date: Oct 2012
Posts: 226
Rep Power: 14 |
If you are using finite-rate species transport, you should patch 0.01 for both fuel and products and also high temperature to start fire.
|
|
January 3, 2013, 03:55 |
|
#4 |
New Member
Mohamed
Join Date: Nov 2012
Posts: 11
Rep Power: 13 |
Thanks msaeedsadeghi
The Fuel temperature is 1000 K Now The problem is that when the the methane ignites, the flame temperature distribution is conversed, i mean that the Fuel tempertaure (1000 K) is the coolest, while the rest of the room reaches 2000, 2200, 2500 K Is there is a reason for that? and how i can avoid it? I need to ignite the methane and have a normal temperature distribution for the flame |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[ICEM] ICEM Scripting Issues | tylerplowright | ANSYS Meshing & Geometry | 33 | September 27, 2021 16:35 |
Fluent 14 journal script to set fluid parameters | jhome | ANSYS | 0 | April 30, 2012 04:26 |
Urgent problem! Appreciate all you help!! 3D Centrifugal Pump set up problems! | RR2 | FLUENT | 5 | April 13, 2012 08:17 |
OpenFOAM installation on SUSE92 problems | derath | OpenFOAM Installation | 1 | April 3, 2006 06:44 |
How to set environment variables | kanishka | OpenFOAM Installation | 1 | September 4, 2005 10:15 |