CFD Online Logo CFD Online URL
Home > Forums > FLUENT

enabling unsteady diffusion flamelet model

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

LinkBack Thread Tools Display Modes
Old   August 18, 2014, 06:26
Default enabling unsteady diffusion flamelet model
New Member
Join Date: Aug 2014
Location: Italy
Posts: 14
Rep Power: 4
idomeneo is on a distinguished road
Hi everybody,
I'm trying to get a numerical simulation of a lifted H2/N2 flame with coflow using the flamelet models available in FLUENT. I read on User's Guide that it's necessary to firstly carry out a steady diffusion flamelet simulation and only after it should be available the unsteady diffusion flamelet option.
However, while I succeeded using the steady diffusion model with "non-adiabatic" option (temperature and species contuos plot show me that combustion occurs), I'm experiecing difficulties to make unsteady flamelet model work.
Actually, residual seems to reach covnergence every time step but temperature and species convergence plots show me that anything change (the whole domain appears to remain unchanged after that).

I attach the parameters used for creating flamelets and pdf tables.
Thank you in advance, I really appreciate any kind of advice.

P.S. I'm a newbie in the forum! I'm sorry if I missed some information or if I put this thread in the wrong section.
Attached Images
File Type: jpg fla_param.jpg (60.4 KB, 20 views)
File Type: png unsteady_fla_param.png (34.3 KB, 20 views)
File Type: jpg pdftable_param.jpg (66.4 KB, 17 views)
idomeneo is offline   Reply With Quote

Old   April 24, 2015, 15:58
sanjeet Limbu
Join Date: Mar 2015
Posts: 91
Rep Power: 3
sanjeetlimbu is on a distinguished road
Hi I am trying use the flamelet model for partilaly premixed..
I want to get the autoignition profile for nheptane: N2/O2?ar/nC7H16..
but getting some error can you help me set up model ... I am new to autoignition
Attached Images
File Type: jpg Flamelet model.jpg (49.9 KB, 12 views)
sanjeetlimbu is offline   Reply With Quote


fluent 14.5, lifted flame, unsteady flamelet

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
Is Non premixed combusiton (flamelet model) in Fluent able to calculate laminar? sooroo3 FLUENT 2 November 10, 2013 06:47
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
unsteady heat transfer model problem Beryl FLUENT 0 July 12, 2011 23:26
Unsteady 3d flow and k-eps model J Roued Main CFD Forum 13 August 31, 1999 13:32
k-omega model and unsteady transition Jens Thurso Main CFD Forum 1 May 4, 1999 09:50

All times are GMT -4. The time now is 05:50.