Learning Forum

[Anand0312]

How to measure the angle of rotation of turbine blades for a particular position or for a particular autosave file from the output in ANSYS Fluent?

[Amine Ben Hadj Ali]

You have time duration and angular speed.

[Anand0312]

I know that is a way,but for large nf autosave files it will be a tedious job, so i want to know that is there any other way of directly getting the value of angle of rotation through any codes or any other technique when we open a file?

[Amine Ben Hadj Ali]

You define a small UDF or expression where you multiply the angular speed with the time step size. 

[Anand0312]

How to define a UDF in Ansys Fluent? If you have any tutorial on that then please forward the link.

[dhanjita medhi]

Hello, for blade oscillation (or amplitude) of 10 degree, I am using a expression of 0.174*43.689[rad/s]*cos(43.689[rad/s]*t) in cell zone conditions under rotatinoal velocity (in which 43.689 rad/s is the rotational speed of the larger rotating domain and expression is for blade domains). In my problem, the blade pitch angle variation is sinusoidal and that's why I am using a expression for rotational speed by derivating the pitch angle expression as dtheta/dt is angular speed. Now I want to check whether blades are pitching with amplitude of 10 degree or not? Can you please help me to measure the angle of rotation of the blades? or how can we check whether my expression is working or not?