|September 13, 2013, 10:05||
k-omega SST vs V2-f
Join Date: Dec 2012
Posts: 32Rep Power: 5
i'm trying to compare the performace of k-omega SST vs V2f. I'm simulating an hill.
this is the geometry of the simulation: link
profile at inlet should be such that the flow is in fully developed state. The paper provide me only the velocity profile.
To get the other profiles, i've setup a simulation of a flat terrain with periodic boundary conditions, as explained to me in this thread.
Residuals of the simulation with k-omega SST, for flat terrain (these are good): image
Residuals of the simulation with V2f, for flat terrain (these aren't good): image
As you can see the residuals tend to be periodic... After 350K iterations the periodic-pattern was still the same...
Using the profiles of k, omega,... obtained from simulations above, and the velocity profiles from the paper, i'll get these results: Result of hill simulations
I was expecting the k-omega SST to overstimate the recirculation region; this is the reason i have tryed the V2F. Anyway, i was also expecting the V2F to give better result in respect to k-omega SST; i was wrong...
What can i do to improve the result of V2F?
1 - all flat terrain simulations have: y+ < 1.
2 - y+ for hill simulations: image
3 - the Reynolds number should be < 4772.
Last edited by Davide_sd; September 17, 2013 at 08:40. Reason: change the subject
|Thread||Thread Starter||Forum||Replies||Last Post|
|"turbulent viscosity limited to viscosity ratio"||olivier||FLUENT||11||October 10, 2015 05:49|
|turbulent viscosity limited to viscosity ratio||Alex_B||FLUENT||16||September 12, 2012 13:17|
|Problem with divergence||TDK||FLUENT||10||September 8, 2012 01:11|
|Problem of Turbulent Viscosity Ratio Limited||David Yang||FLUENT||3||June 3, 2002 06:13|