|March 9, 2012, 06:32||
Problem with the k-omega model
Join Date: Mar 2012
Posts: 140Rep Power: 7
I have a problem with a simulation, and I thought that maybe you could help me...
Actually, I am new at CFD, so this will maybe sounds simple to you. Anyway it isn't for me.
I am supposed to model a 2D airfoil (M, Re, AoA, etc given) with different turbulence models and then compare the results. First, I have established a grid convergence using Spalart Allmaras, and obtained very nice results in agreement with the experimental data. Then, I decided to try my fine mesh (150k cells) with the k-w model. The problem: the turbulent viscosity is too high, or the temperature...well, it doesn't work. Am I supposed to create a new mesh for the k-omega model?
I have uploaded some pictures of my mesh, do you see something wrong? There is y+=1 everywhere.
Thank you very much for your help!
|March 9, 2012, 15:56||
Join Date: Apr 2011
Posts: 73Rep Power: 7
the expansion factor of the mesh shouldn't exceed 1.2, especially in the region near the blade - is that given? Furthermore why dont you use the SST-model instead of k-omega? The SST-model uses a switching function to give good results in the near-wall-regions (like k-omega does) and even far away from the walls (like k-epsilon does).
|airfoil mesh k omega|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Problem with turbulence model||akonduri||OpenFOAM||2||September 17, 2010 00:49|
|Turbulence model for mixing problem???||nileshjrane||Main CFD Forum||7||September 14, 2010 04:57|
|Problem in Herschel-Bulkely model||emad||FLUENT||0||May 20, 2009 14:20|
|Non premixed model - combustion validation problem||David||FLUENT||2||October 24, 2003 10:06|
|Two phase Eulerian Model Problem||senthil||FLUENT||5||May 21, 2003 02:55|