CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Inconsistency on k-omega model Fluent

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 1, 2016, 13:37
Question Inconsistency on k-omega model Fluent
  #1
New Member
 
Lucas Braganša F Lopes
Join Date: Dec 2015
Location: Rio de Janeiro, Brazil
Posts: 1
Rep Power: 0
lucasbraganca is on a distinguished road
Hi.
I'm running a standard k-omega turbulent model on a channel flow with a smooth change of cross section. My preliminary fluent result seems very strange a few meters after the inlet. There is a sudden flattening of the velocity profile that makes no physical sense and that I can┤t get rid of. I've changed the setups a thousand times(e.g. discretization schemes and so forth) but nothing seems to change this scenario.

Alongside fluent, I've also done the very same simulation on OpenFOAM and CFX and both agree with each other pretty well.

What might be causing this weird behavior?

I'm attaching a simple qualitative contour plot just to show where fluent is erring.

Some infos about my geometry and boundary conditions:

-> Channel flow with change of cross section.
-> 2D, steady and turbulent (Re=12600)
-> Inlet velocity profile comes from another simulation (I┤m using a profile data file to define the inlet boundary condition on fluent)
-> Fine mesh at walls (y+ ~ 1)


More specifications can be found on the following website:
https://turbmodels.larc.nasa.gov/Oth...nnel12600.html
Attached Images
File Type: jpg CFXvsFluent.jpg (61.2 KB, 11 views)
lucasbraganca is offline   Reply With Quote

Reply

Tags
ansys 16, channel flow, fluent 16.0, komega, rans

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Seeking Macroscopic Particle Model in Fluent bzhang7 FLUENT 3 June 25, 2022 18:54
Ansys Fluent (K-Epsilon) Model gshankarau FLUENT 0 September 27, 2016 07:30
Ansys Fluent K-Epsilon Model gshankarau FLUENT 0 September 23, 2016 06:59
Fluent :- turbulence Model prince_pahariaa FLUENT 9 May 20, 2016 04:41
How to create a 3Ds Car Model importing to FLUENT? spysunny Main CFD Forum 1 January 11, 2012 00:40


All times are GMT -4. The time now is 11:55.