|
[Sponsors] |
![]() |
![]() |
#1 |
Member
Kapa Lilla
Join Date: Mar 2009
Location: Bruxelles, Belgium
Posts: 57
Rep Power: 17 ![]() |
Dear All,
I'm using a temperature equation version of the simpleFoam solver. I did an isothermal periodic channel flow simulation with Re_tau=150 and used both k-epsilon and v2f turbulence models. It is a resolved simulation, so I used the low-Re version of the k-Epsilon model. The results are fairly reproduced the reference DNS data. After I've switched to a heated case and there I got problem with the k-Epsilon (the v2f remained adequately good in therms of the momentum boundary layer). Surprisingly, the momentum BL has changed, though, the temperature should be only acts as a scalar transport (no buoyancy). Could anyone tell me what could go wrong? I've tried different boundary conditions, turbulent Pr numbers. I tried the 2 low-Re models. Whatever I did, the velocity gradient normal to the wall reduces with 30%, approximately. Thank you for your help, Lilla |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Peter Baskovich
Join Date: Jul 2014
Posts: 127
Rep Power: 12 ![]() |
Hi, I realise I am a bit late but I'd like to discuss this.
Did you check your thermophysical properties? There could be a thermal thinning term in there. Also, how are you handling the T field periodically? |
|
![]() |
![]() |
![]() |
Tags |
channel flow, k-epsilon, low-re, simplefoam, thermal analysis |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Differences and functions of Solidworks Simulation and Solidworks Flow Simulation? | alpharays | Main CFD Forum | 0 | April 19, 2012 04:13 |
IAPWS water properties + orthotropic thermal conductivity | Chander | CFX | 1 | February 29, 2012 18:26 |
SimpleFoam k and epsilon bounded | nedved | OpenFOAM Running, Solving & CFD | 1 | November 25, 2008 21:21 |
Initial k & epsilon for engine simulation | Tomislav Sencic | Main CFD Forum | 1 | November 27, 2007 06:21 |
Thermal cycling simulation - FAN issue | Jean-Baptiste | Main CFD Forum | 4 | April 19, 2007 10:02 |