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Inorder to show the winddirection in a turbine animation, the UVs (parented empties with a UV wrap modifier) are to be scrolled radially .
Scaling the empties does provide radial motion but it scales them as well.
Is it possible to create radial scrolling motion without scaling?
The outside of a circle has more surface area then the center so no, what you are asking for is impossible. But you could move some individual elements out to show the motion.
One easy way to do this would be to use actual objects and move them by scaling multiple objects from the center with Only Locations toggled on:
Or you could also use particles to achieve some cool effects communicating the flow nicely, but further advice requires more info about your situation than you have provided.
It's hard to say in detail without knowing exactly what you need, but some variation on this might serve your purpose:
Here, the nodes are being used to control simple color bands, keying the offset on Length, but they could be used to control the UV look-up of a suitably mapped texture, for hand-drawn, or other effects
