CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Problems with KOmegaSST

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 31, 2012, 05:47
Exclamation Problems with KOmegaSST
  #1
Member
 
wided
Join Date: Jul 2010
Posts: 54
Rep Power: 6
wiedangel is on a distinguished road
Hi,

I am running some steady/transient, turbulent simulations with simple/pimpleFoam using kOmegaSST. I have two questions.

I canīt get any convergence for the steady laminar case, although I am using "correct" boundary conditions for U and p
(see attachment: laminarSteady).

For the unsteady turbulent case I have an over estimation of the lift (which is what to expect without using any transition model) but the simulations are very slow (see attachment turbulentTansient).

Can you please post comments about this matter?

thank you very much.
Attached Files
File Type: gz laminarSteady.tar.gz (2.8 KB, 2 views)
File Type: gz turbulentTransient.tar.gz (3.3 KB, 2 views)
wiedangel is offline   Reply With Quote

Old   May 31, 2012, 10:12
Exclamation
  #2
Member
 
wided
Join Date: Jul 2010
Posts: 54
Rep Power: 6
wiedangel is on a distinguished road
Here are some figures of my mesh (yPlus = 26, so I am using a wall function for the case where the turbulence is on), the results I get for simpleFoam (laminar and steady) for U and p and lift coefficient.

I am really frustrated that I canīt obtain correct results even for the simple case where the flow is laminar and steady, and also that I got no answer to any of my posts concerning KomegaSST in openFoam. where are you Senior Members I need help
Attached Images
File Type: jpg grid1.jpg (97.6 KB, 12 views)
File Type: jpg grid2.jpg (81.8 KB, 12 views)
File Type: jpg grid3.jpg (96.4 KB, 13 views)
File Type: jpg grid4.jpg (97.6 KB, 13 views)
File Type: jpg p.jpg (14.6 KB, 14 views)
wiedangel is offline   Reply With Quote

Old   May 31, 2012, 10:14
Default
  #3
Member
 
wided
Join Date: Jul 2010
Posts: 54
Rep Power: 6
wiedangel is on a distinguished road
The rest of my figures.
Attached Images
File Type: jpg U2.jpg (18.8 KB, 14 views)
File Type: jpg U.jpg (13.6 KB, 11 views)
File Type: png cl.png (3.5 KB, 10 views)
wiedangel is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
kOmegaSST OF2.1 Help needed! wiedangel OpenFOAM Running, Solving & CFD 0 May 9, 2012 11:01
Wrong calculation of nut in the kOmegaSST turbulence model FelixL OpenFOAM Bugs 27 March 27, 2012 10:02
[ICEM] Problems with coedge curves and surfaces tommymoose ANSYS Meshing & Geometry 0 August 5, 2011 17:02
Needed Benchmark Problems for FSI Mechstud Main CFD Forum 4 July 26, 2011 13:13
Some problems with Star CD Micha CD-adapco 0 August 6, 2003 14:55


All times are GMT -4. The time now is 07:39.