CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Pressure distribution over an airfoil-help

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

LinkBack Thread Tools Display Modes
Old   January 11, 2002, 09:21
Default Pressure distribution over an airfoil-help
Andrew Parker
Posts: n/a
Dear all

I am having a problem with the pressure distribution over the surface of an airfoil. I have my own experimental data for lift, drag, and pressure distribution. The flow over the airfoil is separated in real life, and I have it separated in fluent. I have the lift accurate and the drag accurate but the pressure distribution constructed through xy plots is well off.

I don't understand how the lift, and drag can be accurate but the pressure is wrong. I am plotting static pressure against the distance along he airfoil. Has anybody had this problem? What was the remedy? Do I need to use surface integrals to work out the pressure distribution? Could it be to with reference pressures? I have set the gauge pressure on the pressure outlet boundary to zero. The wind tunnel discharges to atmosphere so this is correct, or is it? The operating pressure is 1 atmosphere. But the reference location (0,0) happens to coincide with the leading edge of the airfoil, does this matter?

Need help, a lot of it please!!!


  Reply With Quote

Old   January 15, 2002, 12:32
Default Re: Pressure distribution over an airfoil-help
Posts: n/a
I hope you might be looking at the pressure coefficient values rather than the static pressure values. Did the experimental xy plot has the nondimensional units, if so they are pressure coefficients.

Try out the pressure coefficients for xy plot.

  Reply With Quote

Old   January 15, 2002, 13:11
Default Re: Pressure distribution over an airfoil-help
Andrew Parker
Posts: n/a
Thanks, but that's not the answer the experimental data is my own from a wind tunnel and all the pressure are just static.

Cheers anyway

  Reply With Quote

Old   January 17, 2002, 00:02
Default I also have this trouble.
Posts: n/a
if you know,please tell me.
  Reply With Quote

Old   February 13, 2002, 12:51
Default Re: I also have this trouble.
Lakshmanagouda. .G.patil
Posts: n/a
just see whether you are using cell values or node values. try by changing the node values on and off in xy -plot good luck
  Reply With Quote


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
"Pressure Inlet" Boundary Setup Wijaya FLUENT 15 May 18, 2016 10:08
Pressure BC for combustion chamber Giuki FLUENT 1 July 19, 2011 11:35
How to handle suction and pressure side of an airfoil as two different parts? TKE ANSYS Meshing & Geometry 0 March 4, 2011 08:48
[PyFoam] pressure distribution with pyFoam gimli79 OpenFOAM Community Contributions 2 May 4, 2010 05:28
Airfoil pressure distribution kanishkpanchal Main CFD Forum 2 December 7, 2009 14:21

All times are GMT -4. The time now is 07:31.