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bildramer t1_j5qa2qa wrote

Ignoring the effect from length scaling and drag from walls, it gets more complicated. Liquids have viscosity, and do in fact behave differently at different scales. We use the Reynolds number to describe the different behaviors - laminar or turbulent flow. At small enough scales, your vortices will dissipate very quickly, and at large enough scales, you can ignore viscosity.

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sentientskeleton t1_j5siqen wrote

The only thing that will make the water stop spinning (reduce its total angular momentum) is drag from the walls, so you can't ignore it, no matter how large the Reynolds number. Even at high Re you can't completely ignore viscosity either, its effects only get concentrated into very thin regions (like boundary layers) but there it is extremely important.

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