 |
 |
 |
|
|
|
[Sponsors] | ||||
July 8, 2013, 08:56
|
LES Combustion Boundary Condition
|
#1 |
|
New Member
Phil
Join Date: Jun 2013
Posts: 11
Rep Power: 13  |
hi all,
I am currently developing an LES model for combustion using the flamelet/non-premixed combustion model but I am having a problem... I calculate the correct air and fuel inlet boundary conditions (I have tried both velocity inlet and mass-flow inlet), and I know they are correct as when I run them with the k-epsilon model it gives the correct overall mixture fraction and peak flame temperature, etc. But then when I run it with LES for a while (1-2 flow throughs) the fuel concentration becomes too low and the time-averaged mixture fraction becomes lower than that initially calculated or predicted by the RANS run. I then need to increase the fuel flow until the model gives the correct overall average mixture fraction or equivalence ratio (at the outlet). Has anyone else encountered this issue? Thanks |
|
|
|
|
|
July 11, 2013, 08:23
|
|
#2 |
|
New Member
Phil
Join Date: Jun 2013
Posts: 11
Rep Power: 13 |
can anyone share any insight? even the smallest clue could help a lot...
|
|
|
|
|
|
 |
| Tags |
| combustion, les |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| mixed inflow/outflow downstream boundary condition question | peob | OpenFOAM Running, Solving & CFD | 3 | February 3, 2017 11:54 |
| Question about heat transfer coefficient setting for CFX | Anna Tian | CFX | 1 | June 16, 2013 07:28 |
| Opening Boundary Condition | andreachan | Main CFD Forum | 11 | March 19, 2013 17:46 |
| Boundary Condition pressure inlet/oulet for combustion simulations | Giuki | FLUENT | 0 | May 6, 2009 11:04 |
| spanwiperiodic boundary condition for LES | Sungho Yoon | CFX | 5 | July 8, 2008 07:21 |
Linear Mode
