Settings rotating frames of reference

[0785725]

I'have this litle problem which wiki doesn't have a answer ready for me;

I wish to model two rotating frames of reference in a fluid flow. Both have opposit rotating directions to each other, while they are in the same plane.

How can I determine whether the rotation direction is clockwise or counterclockwise?

Thnx in advance,

Floris

[AstroJohnPE · Accepted solution]

Hi Floris,

When dealing with 3D (and even 2D models that can be viewed from "either side"), it is misleading to think of clockwise and counter clockwise. The rotation speed follows the right-hand rule.

I made the attached image to demonstrate the right hand rule. When your thumb points in the direction of the positive axis or vector, the directions that your fingers curl around the axis show the positive rotation or angle. Therefore, a negative value indicates a rotation or angle in the opposite directions.

[0785725]

Wow   AstroJohn PE, that was a very precise answer.

And it worked great

Thank You so much

Spoiler

Now I only have to buy a faster computer.............

Floris