[cpark]

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

[Maqusud]

Originally Posted by cpark

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?