sentientskeleton t1_j5siqen wrote
Reply to comment by bildramer in If I had two cups of water, one normal size and one as big as a swimming pool and stirred them both with proportionally sized spoons, would the larger pool of water keep spiraling longer than the smaller? by r3volc
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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