|
[Sponsors] |
November 4, 2013, 05:37 |
k-epsilon without wall functions
|
#1 |
Senior Member
Samuele Z
Join Date: Oct 2009
Location: Mozzate - Co - Italy
Posts: 520
Rep Power: 18 |
Dear All,
I am trying to solve a very simple problem (a RANS channel foam) and I want to try different turbulence models. The point is that I have a pretty good mesh, hence I want to avoid to use the wall functions for k and epsilon. Nevertheless, even tough I set different BCs, as soon as I launch the simulation, OpenFOAM automatically writes new files with wallFunctions, both for k and epsilon. How can I avoid it? Also, has anyone already solved a rans channel flow, with cyclic BC? Thanks a lot, Samuele |
|
November 4, 2013, 12:49 |
|
#2 |
Senior Member
Onno
Join Date: Jan 2012
Location: Germany
Posts: 120
Rep Power: 15 |
I don't think kEps is the right turbulence model if you don't want to use wall functions. kOmegaSST would probably be preferable.
|
|
November 4, 2013, 12:51 |
|
#3 |
Senior Member
Samuele Z
Join Date: Oct 2009
Location: Mozzate - Co - Italy
Posts: 520
Rep Power: 18 |
Thanks for answering.
Actually, I was thinking about kEpsilonLowRe (or something like that). Anyway, the point is: how to avoid wall functions? I mean, if I use the kOmegaSST, are the wall function not used by default? Thanks a lot, Samuele |
|
November 4, 2013, 14:54 |
|
#4 |
Senior Member
Onno
Join Date: Jan 2012
Location: Germany
Posts: 120
Rep Power: 15 |
Have you read this thread: http://www.cfd-online.com/Forums/ope...log-layer.html ?
I think OpenFOAM leaves the BC alone, if you set up a nut-files with type calculated for the walls. |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Natural convection in a closed domain STILL NEEDING help! | Yr0gErG | FLUENT | 4 | December 2, 2019 01:04 |
wall functions | kd55 | Main CFD Forum | 2 | April 13, 2012 05:37 |
SimpleFoam k and epsilon bounded | nedved | OpenFOAM Running, Solving & CFD | 1 | November 25, 2008 21:21 |
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug | unoder | OpenFOAM Installation | 11 | January 30, 2008 21:30 |
Wall Functions | pierre | OpenFOAM Running, Solving & CFD | 0 | October 1, 2005 14:13 |