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

epsilon diverging

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 8, 2017, 11:51
Unhappy epsilon diverging
  #1
New Member
 
Arjun Kalkur
Join Date: Sep 2017
Posts: 12
Rep Power: 8
Arjun_kalkur is on a distinguished road
Hey Im simulating a flow over an airfoil with flap with airfoil of chord 100mm, but the slot lip ends at 90% of chord and a fowler flap of 30mm chord is used.

I tried to create a better mesh, average skewness is 7.79e-02.
Although 5 cells are highly skewed.

I named main airfoil and flap separately.
I chose the reference area as 0.12m, (is it correct?) later i tried to solve with almost all possible turbulence model, but it diverges (epsilon, omega) and laminar model behaves quite smoothly till some point and then oscillates.

The inlet velocity chosen was 15m/s.

The continuity residual also increases with iterations.
I get the divergence in the early stage itself along with limit on turbulence viscosity and reversed flows.

I have a doubt that my mesh needs more layers on the airfoil.
I've attached the images, please have a look.

I've tried almost everything, please help ! Thanks alot

https://drive.google.com/file/d/0BzX...ew?usp=sharing

https://drive.google.com/file/d/0BzX...ew?usp=sharing
Arjun_kalkur is offline   Reply With Quote

Reply

Tags
divergence amg solver, reference area, turbulence models

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
SimpleFoam bounded k and epsilon always diverging Deagle OpenFOAM Running, Solving & CFD 2 October 20, 2017 12:33
SimpleFoam k and epsilon bounded nedved OpenFOAM Running, Solving & CFD 16 March 4, 2017 08:30
k and epsilon diverging in MRFSimpleFOAM shyam OpenFOAM Running, Solving & CFD 1 April 8, 2013 08:03
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 20:21


All times are GMT -4. The time now is 08:31.