The Secret Harmony of Fluid Flow: Why Some Forces Never Mix Imagine a volume of space, like a water tank, filled with two distinct types of movement. One movement behaves like a fountain, pushing fluid outward or pulling it inward from specific points—a "push-pull" flow. The other movement is like a whirlpool, swirling in loops but never actually expanding or contracting—a "swirling" flow. There is a remarkable principle in physics that occurs when the swirling flow is perfectly contained, meaning it slides along the walls of the tank but never actually crosses through them. Under this specific condition, these two types of motion become "energy orthogonal." This means that even though they are happening in the same space at the same time, they do not interfere with or "talk" to each other.
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