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

epsilon instability

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 20, 2013, 03:13
Default epsilon instability
  #1
Senior Member
 
sivakumar selvaraju
Join Date: Mar 2009
Location: Cape Town - South Africa
Posts: 186
Rep Power: 8
sivakumar is on a distinguished road
Send a message via Skype™ to sivakumar
Hi Everyone,
I am using MRFSimpleFoam for my fan simulation, I had some non-orthogonal cell so I have given limited 0.5 for laplacian scheme.

My simulation is running without bounding error, but the convergence plot looks strange. epsilon is fluctuating too much (see the fig).

can you guys give me some tips to fix this fluctuation.

wall functions are:

k --> kqRWallfunction
e --> epsilonWalfunction
nut --> nutWallFunction

solvers:
p --> GAMG
epsilon --> smoothSolver
smoother GaussSeidel

give me some suggestions, where I am doing wrong.

Thanks,
Sivakumar
Attached Images
File Type: jpg Screenshot from 2013-03-19 11:53:05.jpg (39.5 KB, 11 views)
sivakumar 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
SimpleFoam k and epsilon bounded nedved OpenFOAM Running, Solving & CFD 13 November 4, 2013 15:13
calculation stops after few time steps sivakumar OpenFOAM Running, Solving & CFD 7 March 17, 2013 07:37
Calculation of k and epsilon freezes Nigirim OpenFOAM Running, Solving & CFD 1 November 14, 2012 08:52
epsilon and K blowing up. sivakumar OpenFOAM Running, Solving & CFD 1 October 25, 2012 04:50
SimpleFoam k and epsilon bounded nedved OpenFOAM Running, Solving & CFD 1 November 25, 2008 21:21


All times are GMT -4. The time now is 12:10.