CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

does aspect ratio affect analysis

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 10, 2005, 03:07
Default does aspect ratio affect analysis
  #1
mahesh
Guest
 
Posts: n/a
for thermal analysis i am using fem software ANSYS. and in that i have found warning that you have crossed the limit of the aspect ratio. and then i have changed the limit of the aspect ratio. so i have a question that does any change in aspect ratio make any change in my analysis?

so pl reply me thanks

  Reply With Quote

Old   October 10, 2005, 08:51
Default Re: does aspect ratio affect analysis
  #2
Renato
Guest
 
Posts: n/a
Yes, bad aspect ratios can interfere in your result and it was already subject of research for incompressible flows in finite element analysis

For further details, take a look in:

S. Mittal, "On the performance of high aspect ratio elements for incompressible flows ", Comput. Methods Appl. Mech. Engrg. 188 (2000) 269-287.

Cheers

Renato.
  Reply With Quote

Old   October 10, 2005, 09:12
Default Re: does aspect ratio affect analysis
  #3
Renato
Guest
 
Posts: n/a
I've forgot to mention something...

If your model is too much complex and your have few elements with bad aspect ratio "lost" in regions with small gradients I think you don't need to bother about them. These bad elements probably will only disturb your solution convergence.

I've already done the same thing you've cited in your post with Ansys/Flotran but I was not able to see any big diference in my result (I had less than 1% of bad elements in a huge mesh)

Cheers

Renato.
  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
High aspect ratio oort OpenFOAM 5 September 16, 2011 14:06
pressure eq. "converges" after few time steps maddalena OpenFOAM Running, Solving & CFD 69 July 21, 2011 07:42
aspect ratio vs. y+ hammam CFX 3 August 6, 2007 10:41
High Aspect Ratio elements Flavio CFX 2 November 24, 2006 13:01
Aspect Ratio at high turbulent and swirled flows zago FLUENT 0 May 19, 2004 02:37


All times are GMT -4. The time now is 19:45.