|
[Sponsors] |
April 23, 2017, 07:13 |
LES modelling of walls
|
#1 |
Member
Arnout
Join Date: Nov 2010
Posts: 46
Rep Power: 15 |
Hi,
I have been reading for some time about LES modelling in openFoam but there are still some things unclear. 1) Use of delta cubeRootVol. There are vanDriestCoeffs specified in the tutorial cases. But if I understand it correct, using cubeRootVol by an algebraic (Smagorinsky) or one equition LES model is not damping close to the wall. Why are those coefficient specified? 2) cubeRootVol is good for dynamic LES modelles since the coefficients are calculated and depending on the flow (How to use dynSmagorinsky model correctly ?). 3) For y+ <1, cubeRootVol can be used since the wall sub layer is calculated. 4) For y+>1, vanDriest delta should be used to damp turbulent viscosity close to the wall if one equition model or Smagorinsky model is used. Is my understanding correct or wrong? |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Time required for RANS vs. LES vs. DNS | Wingman | Main CFD Forum | 5 | September 25, 2021 08:28 |
LES spray modelling | suryakaundinya | OpenFOAM Running, Solving & CFD | 0 | April 3, 2017 05:05 |
Grid difference between wall modeled LES and wall resolved LES | hityangsir | Main CFD Forum | 9 | April 17, 2015 11:59 |
OpenFOAM LES capability questions | siw | OpenFOAM Running, Solving & CFD | 3 | January 6, 2015 08:50 |
LES modelling | Sufian | FLUENT | 2 | August 12, 2006 20:00 |