People think it's some magic ability, but it isn't. Anyone can have CFD eyes, all you have to do is understand how air behaves. There's no magic to it, you just understand.
When air impinges on a moving object, the object is pressed against the air, the pressure increases. Air mass is deflected away, some of the air sticks to the object, most doesn't. Most of the air flows around a thin layer of air that sticks to the object. To really understand air you really need to understand that air sticks, and the air isn't flowing around an object as much as air is flowing around air.
Let me rephrase that, air doesn't flow around objects, air only flows around more air. The shape the air takes is defined by the object doing the deflecting. Assuming a constant and steady motion in still air, the object displaces air, in a steady and consistent way. That steady and consistent wake then becomes the actual object displacing the air around it. The wake then becomes a sort of virtual bodywork.
Recirculation bubbles aren't necessarily a bad thing, they can create flow restrictions which accelerate flow when needed.
https://youtu.be/qhsTQn0uUOQ?t=1244
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