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

NO STAGNATION POINT FOR AIRFOIL SIMULATION

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 29, 2008, 09:57
Default NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #1
Rif
Guest
 
Posts: n/a
Hi, I'm running an airfoil simulation on a cfd code,SWIFT. does anybody know why i cannot get a stagnation point at the leading edge of my airfoil? The velocity at the leading edge should be 0 m/s but i cannot seem to get this in my simulations. i'm running for AOA 0 degrees at high Reynolds number. what can possibly cause my simulation to have no stagnation point at all?

Cheerios Rif
  Reply With Quote

Old   January 29, 2008, 10:13
Default Re: NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #2
Mani
Guest
 
Posts: n/a
Very weird!
  Reply With Quote

Old   January 29, 2008, 13:26
Default Re: NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #3
ag
Guest
 
Posts: n/a
I would guess that the boundary conditions have either not been specified or have been specified incorrectly.
  Reply With Quote

Old   January 29, 2008, 16:00
Default Re: NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #4
Mani
Guest
 
Posts: n/a
Have you specified the airfoil as wall? Again i agree with ag something is wrong with BC.

Mani
  Reply With Quote

Old   January 29, 2008, 16:47
Default Re: NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #5
Simon
Guest
 
Posts: n/a
What type of mesh typology are you using. I would need to look at your mesh before i can say anything. Can you e-mail it to me on cfd.student@gmail.com.

Simon
  Reply With Quote

Old   January 30, 2008, 06:42
Default Re: NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #6
Simon
Guest
 
Posts: n/a
Mesh is indeed not a very good one as you mentioned in your e-mail. However, it should still give you a stagnation point. Your boundary conditions also ok. Mind boggling
  Reply With Quote

Old   February 4, 2008, 07:33
Default Re: NO STAGNATION POINT FOR AIRFOIL SIMULATION
  #7
Glenn
Guest
 
Posts: n/a
Two thoughts for your consideration on this... 1) Are you seeing the flow vectors splitting and heading towrads the pressure and suction side of the airfoil at the leading edge? If so, stagnation falls in between this split direction vectors...but if you mesh is coarse there, you may not have any mesh points to capture the actual fidelity of a stagnation point. 2) If you do not see the vectors splitting towards the pressure and suction sides, it is possible your stagnation point exists on the airfoil pressure side, slightly downstream of the leading edge. You may be experiencing a scenario where the flow wants to head around the suction side so strongly, relative to the pressure side, that the approach flow is vectorially re-oriented towards the suction side and stagnation is occuring off the leading edge onto the pressure side.

Check your solution to see if either of these scenarios makes sense to your specific problem.
  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
Point the noob in the right way - IC Engine exhaust simulation AndreF OpenFOAM Running, Solving & CFD 12 December 16, 2009 05:04
Replacing mesh while running a simulation akultane CFX 1 November 15, 2009 13:46
Simulation of a single bubble with a VOF-method Suzzn CFX 18 October 2, 2009 04:18
Stagnation point and other issues Freeman FLUENT 0 December 12, 2005 15:16
How can I get Cp=1 at the stagnation point ? largeeedysimulation FLUENT 1 September 7, 2005 18:03


All times are GMT -4. The time now is 01:49.