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

validating

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 13, 2009, 15:21
Default validating
  #1
hsn
Guest
 
Posts: n/a
Hi I had an analyze on an airfoil. Because I wanted to valid my CFD I first analyzed a same airfoil witch I had its experimental results. I want to know that because the model witch I have its experimental results was smaller(1/4) of the main airfoil, how can I make a relationship between the meshes of the tow airfoil? For example the size of the mesh on the airfoil, its height and so on. thanks.
  Reply With Quote

Old   January 14, 2009, 01:37
Default Re: validating
  #2
Antimony
Guest
 
Posts: n/a
Hi,

Do you mean that your CFD results are larger than the experimental results? May I know what kind of mesh you are using - structured or unstructured? Are the size of the cell elements near the airfoil also big?

Regards

Venugopalan
  Reply With Quote

Old   January 14, 2009, 03:32
Default Re: validating
  #3
hsn
Guest
 
Posts: n/a
let me explain it. consider you want to validate your resoults with having a same analyze on an airfoil witch is the same but smaller than your airfoil. and you undrestand that the results you gain are the same as the experimental results. so now that you want to analyze the main airfoil that is bigger than the one you used to validate your way of analyz, how can you make a relationship between them. for example consider that the hieght of the first mesh in the small airfoil, is 1mm. and you got good results of it. now how can you predict the hieght of the main airfoil first mesh? because the size of the tow airfoil are not the same. I just want to know how much it is important and how can I predict from the validating mesh, the form of main mesh. thanks for your attention.
  Reply With Quote

Old   January 16, 2009, 04:01
Default Re: validating
  #4
Antimony
Guest
 
Posts: n/a
You can use the same size of spacing from the previous case as a starting point for this, I guess. Then when you do your grid convergence, you can see if you want to increase or decrease the grid spacing in order to get accurate results.

Hope this helps.
  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
validating hsn Main CFD Forum 1 January 13, 2009 20:59
validating hsn CFX 0 January 13, 2009 02:48
validating turbulence model on flow around a car Pedro CFX 1 February 20, 2008 17:32
Need Help! - Validating Thin Airfoil Theory Bill FLUENT 2 October 31, 2005 06:53
VALIDATING COMBUSTION MODELS ELI Main CFD Forum 1 July 26, 2000 01:36


All times are GMT -4. The time now is 02:06.