Lift and drag over airfoil

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filippo.aero
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Lift and drag over airfoil

Postby filippo.aero » Sat Jun 02, 2012 10:01 am

Hello to everyone, I just started to use Tecplot for analyzing a flow created by a CFD code, but I can't get the lift and drag of an airfoil.

When I use the analyze->integrate tool, and set the integration to forces and moments, I get an error message saying:
"Cannot integrate Forces and Moments over 2-D finite-element zones in 2D Cartesian plots (zone 1 is finite-element)"

Any idea or suggestion?

Thanks in advance.

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aritzmann
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Re: Lift and drag over airfoil

Postby aritzmann » Sun Jun 03, 2012 7:32 am

Hi,

If I remember the CFD analyzer correctly (and it has been a few years since I really used it), the forces and moments are calculated on a surface by considering the fluid flow in the adjacent regions of space. This means that in a 2D plot, the forces and moments are integrated over a line (closed loop representing the airfoil cross section). If you have a full surface, then you need to switch the plot to 3D Cartesian and activate the volume zones around the the airfoil surface.

I hope this helps a little bit,

Andrew
Andrew Ritzmann

filippo.aero
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Re: Lift and drag over airfoil

Postby filippo.aero » Sun Jun 03, 2012 9:48 am

Unfortunately my problem is a 2-d flow, so I can't switch to a 3-d cartesian. How do I integrate over a line?

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aritzmann
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Re: Lift and drag over airfoil

Postby aritzmann » Sun Jun 03, 2012 10:28 am

Hi,

You need to define an additional zone which is the boundary of the airfoil. Then you integrate over this zone to get forces and moments.

Andrew
Andrew Ritzmann

filippo.aero
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Posts: 3
Joined: Fri Jun 01, 2012 11:47 am
Location: Italy

Re: Lift and drag over airfoil

Postby filippo.aero » Sun Jun 03, 2012 10:42 pm

First of all thanks for your help.
Then how can I create this zone? Which parameters should I use?


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