|
[Sponsors] |
September 22, 2017, 11:16 |
Remove the Turbulence Model
|
#1 |
New Member
Jem
Join Date: Dec 2016
Posts: 19
Rep Power: 9 |
Hey, how can i remove the turbulence model?
Im using the Channel395 and i want to remove the turbulence model. Is it enough to change the Turbulence model from "WALE" to "laminar" in the turbulence Properties? I did that, but i kinda get the same results. Greetings Jem01 |
|
September 25, 2017, 09:27 |
|
#2 | |
Senior Member
Join Date: Aug 2014
Location: Germany
Posts: 292
Rep Power: 13 |
Quote:
|
||
September 25, 2017, 09:37 |
|
#3 |
New Member
Jem
Join Date: Dec 2016
Posts: 19
Rep Power: 9 |
Im trying to reconstruct the famous dns channel flow from Kim, Moin, Moser with OpenFOAM.
I Attached my results. S2 is with turbulence model and S3 is without. I Hoped i get closer to the KMM reference by removing the turbulence model, but it dosnt. I also changed the Grid Resolution and the time resolution d^*. My aime is to get as close to the reference as possible. |
|
September 25, 2017, 09:41 |
|
#4 |
New Member
Jem
Join Date: Dec 2016
Posts: 19
Rep Power: 9 |
Here proper Attachments
|
|
September 25, 2017, 09:45 |
|
#5 |
Senior Member
Join Date: Aug 2014
Location: Germany
Posts: 292
Rep Power: 13 |
What is your mesh resolution?
|
|
September 25, 2017, 11:24 |
|
#6 |
New Member
Jem
Join Date: Dec 2016
Posts: 19
Rep Power: 9 |
S1 Resolution = 60 000 (with turbulence Model, d* = 0m3)
S2 Resolution changed from 60 000 to 260 000 S3 Turbulence Model removed S4 d* from 0,3 changed to 0,03 |
|
September 26, 2017, 02:38 |
|
#7 |
Senior Member
Join Date: Aug 2014
Location: Germany
Posts: 292
Rep Power: 13 |
Hi, i'm not familiar with the KMM DNS case but a quick google search showed me they used a mesh in the Order of ~3 Mio. cells. So if you want to get there without turbulence modelling (=DNS) there is no alternative to increasing mesh size further, i suppose.
The real question seems why your LES solution is off from reference case. I'm no expert in LES unfortunately but i know that BC's is an important topic. Basically LES solutions are very sensitive to the right inlet/outlet conditions. I would also check the WALE model regarding mesh sizing etc. Good luck. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Question about matching of solver and turbulence model | louistse | OpenFOAM Running, Solving & CFD | 1 | February 1, 2017 21:36 |
Error in Two phase (condensation) modeling | adilsyyed | CFX | 15 | June 24, 2015 19:42 |
Overflow Error in Multiphase Modelling with Two Continuous Fluids | ashtonJ | CFX | 6 | August 11, 2014 14:32 |
An error has occurred in cfx5solve: | volo87 | CFX | 5 | June 14, 2013 17:44 |
Wrong calculation of nut in the kOmegaSST turbulence model | FelixL | OpenFOAM Bugs | 27 | March 27, 2012 09:02 |