|
[Sponsors] |
HELP! TURBULENCE k-e OR k-omega TURBULENCE MODEL? |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
July 25, 2003, 15:11 |
HELP! TURBULENCE k-e OR k-omega TURBULENCE MODEL?
|
#1 |
Guest
Posts: n/a
|
Hello Fluent Users again? I have one short question (according to my previous e-mail 2 days ago): Is it possible to simulate CORRECT simulation of steady incompressible air flow around circular cylinder with the aid of mentioned k-eps or k-omega turbulence model in FLUENT (v.6.0.20). I can't get correct static pressure distribution on the back side of cylinder (2-D or 3-D). Diameter of cyl=10mm and Re=1E+3 to 1E+5 (in func. of cyl diameter). Can anybody help me? Thanks in advance.
|
|
July 26, 2003, 12:34 |
Re: HELP! TURBULENCE k-e OR k-omega TURBULENCE MOD
|
#2 |
Guest
Posts: n/a
|
I feel the flow will become unsteady at these reynolds - 10^5! Please check it!
|
|
July 26, 2003, 14:59 |
Re: HELP! TURBULENCE k-e OR k-omega TURBULENCE MOD
|
#3 |
Guest
Posts: n/a
|
I've got a feeling that unsteady vortex shedding (Von Karmen vortex street), occurs at a much lower than Rn = 10^5. Best to check in a good fluid dynamics text.
The first thing I think of with regard to problems like these is fine grids and lots of small time steps and a turbulence model which is not k-e, but possibly k-w. James |
|
July 27, 2003, 12:45 |
Re: HELP! TURBULENCE k-e OR k-omega TURBULENCE MOD
|
#4 |
Guest
Posts: n/a
|
Thanks for your help, but it dosn't solved my problem. Have you got any other ideas to solve my problem. Thanks in advance.
|
|
July 30, 2003, 23:06 |
Re: HELP! TURBULENCE k-e OR k-omega TURBULENCE MOD
|
#5 |
Guest
Posts: n/a
|
Hi,
There is a limit for a k-eps or k-omega turbulent model used to predict flow with strong vortex like your case. However RNG-k-eps will be better than k-eps in this case. If it is possible, you can try RSM turbulent model or LES simulation, results will be more close to your experience. Hope it will giave you little help. Mark |
|
August 24, 2003, 23:31 |
Re: HELP! TURBULENCE k-e OR k-omega TURBULENCE MOD
|
#6 |
Guest
Posts: n/a
|
I have met the same problem before. In predicting pressure and heat transfer cofficient on surface cann't get satisfy result.
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Use of k-epsilon and k-omega Models | Jade M | Main CFD Forum | 40 | January 27, 2023 08:18 |
Adding a Turbulence Model | doug | OpenFOAM Running, Solving & CFD | 11 | May 21, 2018 14:54 |
SimpleFoam case with SpalartAllmaras turbulence model implemented | nedved | OpenFOAM Running, Solving & CFD | 2 | November 30, 2014 23:43 |
KOmega Turbulence model from wwwopenFOAMWikinet | philippose | OpenFOAM Running, Solving & CFD | 30 | August 4, 2010 11:26 |
v2-f turbulence model in CFX? | flga | CFX | 14 | November 23, 2006 07:12 |