Wind tunnel simulation; Varying the angle of attack

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  • Last Post 07 May 2020
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HHK1992 posted this 04 May 2020

Hi,

I hope you all are doing good.
I am trying to simulate the flow through a wind tunnel and measure the aerodynamic force coefficients of an airfoil placed at the test section of the wind tunnel. I need to do this at various angles of attack.
I know that adjusting the flow direction (and keeping the airfoil horizontal) can do it (PFA pic1). But, this does not seem to be the right method for the simulation of the flow through the wind tunnel (PFA pic2), especially at higher angles of attack.
Does anybody know how to adjust the angle of attack in the wind tunnel simulation without remeshing the geometry for each angle of attack?
Do I need an overset mesh for this?
Please let me know. Thanks in advance.

Pic1

Pic2

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abenhadj posted this 04 May 2020

You just provide the adjusted inflow direction on your far field boundary or Inlet as you know the angle of attack.

Best regards, Amine

HHK1992 posted this 04 May 2020

Hello Sir,

Thanks for the reply. 
So, you are suggesting to adjust the flow direction (in case of wind tunnel simulation) to get the angle of attack? Similar to the isolated airfoil case (with far-field BC)? Will it cause any problems?
I thought I might have to rotate the airfoil geometry in the wind tunnel simulation, which appeared to be appropriate.
Kindly let me know.

abenhadj posted this 04 May 2020

That is the way actually this kind of investigation is done (far field flows). For wind tunnel I would rather however rotate the mesh / Geometry. 

Best regards, Amine

HHK1992 posted this 05 May 2020

In that case, could you please tell me how to rotate the geometry without remeshing it?
I am hoping to change the AoA from 0 to the stall angle. Should I make two cell zones? What kind of interface will be appropriate?

I appreciate your time and suggestions.

Thanks in advance.

Kalyan Goparaju posted this 05 May 2020

Hello, 

Here is a video tutorial of how to setup the problem that you are describing. Hope it helps. 

Thanks, 

Kalyan

HHK1992 posted this 06 May 2020

Hi,

Thanks for the video. It is really helpful!

 

I prepared a structured mesh and the calculation is steady-state in my case.

Anyhow, I will try it out.

 

Kalyan Goparaju posted this 06 May 2020

I am glad it helped. Can you mark the answer as solved so that it will help others?

Thanks, 

Kalyan

HHK1992 posted this 07 May 2020

Ok. I will do that.

For others who may try this, the following will be useful too.


https://www.cfd-online.com/Forums/fluent/226649-wind-tunnel-simulation-varying-angle-attack.html

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