Force Distribution in Wind Tunnel Experiments

AI Thread Summary
The discussion revolves around the relevance of plotting force distributions in wind tunnel experiments when pressure distributions are already available. The user questions the necessity of creating contour plots for forces since they can derive forces from pressure coefficients, which represent pressure in a dimensionless form. They express concern that this may be redundant, especially given the simplicity of their model and the averaging nature of their measurements. Additional considerations include the potential impact of turbulence and dynamic pressure, which could affect force representation. Ultimately, the user seeks clarity on whether force distribution plots would provide valuable insights beyond the existing pressure data.
leakeg
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Hi physics peoples,

[for the tl;dr peeps: is there any point plotting a force distribution when I already have a pressure distribution, aren't they essentially the same thing?]

I've been doing wind tunnel experiments on structures for my final year engineering project, my supervisor (who I have a feeling knows less about the topic than me, which isn't much) has asked me to come up with contour plots for the forces on a model, and I'm wondering how to go about it, and if it is even possible.

What I have at the moment is a bunch of pressure values at various locations and from this contour plots of the Pressure Coefficient, Cp = (p - po)/(0.5ρV2) - it seems trivial to convert these values to forces for some corresponding area - simply multiply Cp by 0.5ρV2L2 - but this will be a force value for a specific area, and seems pointless to plot this when we already have the Cp values with are a dimensionless representation of pressure - a force per unit area.

Any thoughts are appreciated... from what I can tell "plotting the force distribution" seems like a fairly pointless exercise when I already have the pressure distribution, but I'm keen to hear some opinions.

Thanks in advance for any help!
 
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Well the big question is how complicated your wind tunnel experiments are.

Do you differentiate between dynamic pressure and static pressure? If you have turbulence are there forces, that cannot be represented by an average pressure, like short bursts that would get averaged out? Can you say something about the stresses and torque inside your model?

Maybe answering some of this stuff can give you some ideas what you could present to your boss. Maybe not.
 
Thanks for the reply.

The model is very basic, just a wooden shell.
Dynamic pressure was not measured as the hardware we used does not take high frequency measurements. So it is all averages.

Also not boss haha! It's for uni, my supervisor is what we call our allocated professor.
 
So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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