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Moment coefficient of moving airfoil

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Old   October 26, 2018, 09:04
Default Moment coefficient of moving airfoil
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Hi,

I'm modelling an airfoil undergoing sinusoidal pitching and plunging motion, using tabulated6DOF motion.

I have a centre of rotation of my airfoil (x = chord length/3) and would like to calculate the moment around this point for the duration of my simulation. However, in the 'ForceCoeffs' file, I can only specify a single point for the Centre of Rotation (CoR). My centre of rotation will be moving up and down with the airfoil so the moment coefficients I get are around the wrong (fixed) point.

I can see two ways to solve this:

1) Being able to specify my centre of rotation as moving
or
2) Being able to find the aerodynamic centre of the airfoil throughout its motion. I can then use the lift and drag forces in a moment equation to find the moment around my (x = chord length/3) point.

Does anyone know how to do these?

Thanks,

Calum
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Old   May 10, 2020, 12:27
Default How to calculate Moment coefficient of moving airfoil ?
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Maqusud
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Quote:
Originally Posted by cpark View Post
Hi,

I'm modelling an airfoil undergoing sinusoidal pitching and plunging motion, using tabulated6DOF motion.

I have a centre of rotation of my airfoil (x = chord length/3) and would like to calculate the moment around this point for the duration of my simulation. However, in the 'ForceCoeffs' file, I can only specify a single point for the Centre of Rotation (CoR). My centre of rotation will be moving up and down with the airfoil so the moment coefficients I get are around the wrong (fixed) point.

I can see two ways to solve this:

1) Being able to specify my centre of rotation as moving
or
2) Being able to find the aerodynamic centre of the airfoil throughout its motion. I can then use the lift and drag forces in a moment equation to find the moment around my (x = chord length/3) point.

Does anyone know how to do these?

Thanks,

Calum


Hi sir,
I am facing the same problem. did you find any solution?
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aerodynamic center, airfoil, cor, rotation

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