[OpenFOAM] Plot Angle of Attack Next to Transient Pitching Airfoil

dancfd · August 19, 2012, 17:50

Hello all,

I am running a simulation of a 2-D airfoil that is oscillating in the pitch axis, and I would like to be able to plot the angle of attack of the airfoil vs time (or even just show the angle of attack) in paraview next to the domain, where I show a surface plot of the pressures or velocities. Does anyone have an idea of how I can do this? I also do not know of a way to output the angle of attack - perhaps this could be calculated from the ux uy components in paraview and then plotted? I have worked out the angle of attack manually, but that does not help me much for paraview.

Thanks for any advice,

Dan

Tarak · April 29, 2013, 12:50

Hii Dan,

Can you please tell if you managed to do that?

Thanks,
Tarak

dancfd · April 29, 2013, 21:05

Hello Tarak,

I found a way to show the angle of attack in text using the filter PythonAnnotation. To use this, you will need to compile paraView with python enabled. The only way I could make this work was by downloading and compiling version 3.98, running it via a desktop link, and opening a .foam case file, generated by running "touch <casefolder>" in the case directory.

I used the following formula to calculate alpha:
"Alpha: %.2f deg" % (10+5*sin(t_value*5.4))

I hope this helps.

Dan

Tarak · May 1, 2013, 11:35

Thanks a lot, Dan!!

kiddmax · June 20, 2013, 10:38

Dear Dan,

I am also going to do some simulations about pitching and plunging airfoil. Could you give me some hints how to do that? Is there some example I can follow?

Best regards,
Ye

dancfd · June 25, 2013, 21:02

Hello Ye,

I have been able to reproduce pitching airfoil results by using rhoCentralFoam. I have not played with plunging, though - why would you need both? The pitch motion in experiments is generally used to model the effect of plunging on the angle of attack. I was unable to make the mesh geometry move to produced the angle of attack, so I had to use a time-varying velocity boundary condition.

I hope this helps.

Dan

faraz22 · October 24, 2013, 00:37

Hello, is there any way to calculate AOA for 3D case or visualise it in Paraview or any utility in opefoam for calculating exact angle of attack at various sections for twisted teetered blade? any help? i did it manually but i want to counter check my results.

thanks!

August 19, 2012, 17:50	Plot Angle of Attack Next to Transient Pitching Airfoil	#1
dancfd Senior Member Daniel Join Date: Jul 2009 Location: Montreal, Canada Posts: 156 Rep Power: 16	Hello all, I am running a simulation of a 2-D airfoil that is oscillating in the pitch axis, and I would like to be able to plot the angle of attack of the airfoil vs time (or even just show the angle of attack) in paraview next to the domain, where I show a surface plot of the pressures or velocities. Does anyone have an idea of how I can do this? I also do not know of a way to output the angle of attack - perhaps this could be calculated from the ux uy components in paraview and then plotted? I have worked out the angle of attack manually, but that does not help me much for paraview. Thanks for any advice, Dan

April 29, 2013, 21:05		#3
dancfd Senior Member Daniel Join Date: Jul 2009 Location: Montreal, Canada Posts: 156 Rep Power: 16	Hello Tarak, I found a way to show the angle of attack in text using the filter PythonAnnotation. To use this, you will need to compile paraView with python enabled. The only way I could make this work was by downloading and compiling version 3.98, running it via a desktop link, and opening a .foam case file, generated by running "touch <casefolder>" in the case directory. I used the following formula to calculate alpha: "Alpha: %.2f deg" % (10+5sin(t_value5.4)) I hope this helps. Dan donQi and mbookin like this.

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April 29, 2013, 12:50		#2
Tarak Senior Member Tarak Join Date: Aug 2010 Location: State College, PA Posts: 111 Rep Power: 15	Hii Dan, Can you please tell if you managed to do that? Thanks, Tarak

May 1, 2013, 11:35		#4
Tarak Senior Member Tarak Join Date: Aug 2010 Location: State College, PA Posts: 111 Rep Power: 15	Thanks a lot, Dan!!

June 20, 2013, 10:38		#5
kiddmax Member Ye Zhang Join Date: Dec 2009 Location: Delft,Netherland Posts: 92 Rep Power: 16	Dear Dan, I am also going to do some simulations about pitching and plunging airfoil. Could you give me some hints how to do that? Is there some example I can follow? Best regards, Ye

June 25, 2013, 21:02		#6
dancfd Senior Member Daniel Join Date: Jul 2009 Location: Montreal, Canada Posts: 156 Rep Power: 16	Hello Ye, I have been able to reproduce pitching airfoil results by using rhoCentralFoam. I have not played with plunging, though - why would you need both? The pitch motion in experiments is generally used to model the effect of plunging on the angle of attack. I was unable to make the mesh geometry move to produced the angle of attack, so I had to use a time-varying velocity boundary condition. I hope this helps. Dan

October 24, 2013, 00:37		#7
faraz22 New Member faraz Join Date: May 2013 Posts: 7 Rep Power: 12	Hello, is there any way to calculate AOA for 3D case or visualise it in Paraview or any utility in opefoam for calculating exact angle of attack at various sections for twisted teetered blade? any help? i did it manually but i want to counter check my results. thanks!