Forum
Important Notice for New User Registrations
To combat an increasing number of spam and bot registrations, we now manually approve all new user registrations. While this may cause a delay until your account is approved, this step is essential to ensure the quality and security of this forum.
To help us verify your registration as legitimate, please use a clear name as user name or an official email address (such as a work, university, or similar address). If you’re concerned that we may not recognize your registration as non-spam, feel free to email us at with a request to approve your username.
About vortex core radius and age angle
Hi david
Recently I have reviewed many papers where people have derived formulas about the variation of the radius of the vortex core with the age angle, the first of which is given in your paper, the second is used in openfast, and the third was learned from a Chinese scholar. I think these three formulas seem to look different .
I think that if I wanted to calculate the radius of the vortex core at the current time step, the final form of the formula that could be used directly to program the calculation might look like fig.2. Because the age angle is infinitely cumulative, when it is divided by omega, it represents the cumulative result after multiple time steps.
What do you think?
Thanks,
BR,
Roby
Uploaded files:- You need to login to have access to uploads.
Hi Roby,
essentially the formulas you have attached are very similar, where some use a combination of rotational speed and rotor angle and others use the time directly.
This is should yield the same result as long as the rotor speed is constant. Since typically, the rotor speed changes during operation of a wind turbine we have opted to use delta t directly for the evaluation of vortex core growth.
BR,
David
Thank you very much for your quick reply!
BR,
Roby
