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

failure of ignition when using chemkin imported thermodynamic and transport data

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 11, 2019, 16:58
Default failure of ignition when using chemkin imported thermodynamic and transport data
  #1
Senior Member
 
Weiqiang Liu
Join Date: Feb 2018
Posts: 278
Rep Power: 9
Weiqiang Liu is on a distinguished road
hello all,

I am simulation methane air catalytic combustion in a micro-channel. The gas phase reactions are ignored and surface mechanism and thermo are imported by chemkin files.

First, I tried to use default value of gas thermo and transport in fluent data base. I can get ignited results though with some discontinuities and discrepancies with literature. In order to improve the results, I tried to import gas thermo and transport data attached with GRI3.0 mechanism. However, this time I can not get ignited results. The reaction zone just moves very slowly from the inlet to outlet and finally all the computation domain is room temperature.

The link below shows a thread I posted on ansys student community.


I am really confused about why the failure of ignition associated with chemkin imported gas thermo and transport data.

Can anybody give me some hints?

thanks

weiqiang.
Weiqiang Liu is offline   Reply With Quote

Old   February 11, 2019, 19:30
Default
  #2
Senior Member
 
Weiqiang Liu
Join Date: Feb 2018
Posts: 278
Rep Power: 9
Weiqiang Liu is on a distinguished road
by the way, the energy residual is very small like 1e-4 at the beginning of iteration. Does it mean all the reactions do not happen?
Weiqiang Liu is offline   Reply With Quote

Reply

Tags
gas phase thermo, ignition, transport

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
thermodynamic and transport between fluent database and external imported data Weiqiang Liu FLUENT 0 February 4, 2019 11:13
thermo and transport data in fluent database Weiqiang Liu FLUENT 3 January 31, 2019 19:23
Thermodynamic & Transport Properties Ning.Li OpenFOAM Programming & Development 0 June 18, 2017 11:11
Transport and Thermodynamic Properties in cavitatingFoam sfigato OpenFOAM Pre-Processing 0 January 7, 2013 10:59


All times are GMT -4. The time now is 02:58.