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It’s a really interesting question, I would love it if someone who understands this kind of physics properly would chime in!
By my understanding of Reynolds number etc, the faster they go, the more turbulent the flow, so the rocks would be constantly hitting against each other sideways, and surely grind to dust in the constantly accelerating scenario.
But maybe the infinite (looped) nature of this ‘dimension’ means that this logic doesn’t apply. What would even be the ‘characteristic length’? Are we thinking about established flow at the centre of an infinitely wide pipe? Am I wrong to think of constantly accelerating rocks with air in between as a type of fluid flow?
I guess I was imagining it with the walls torn out as well, but you’re right the op (of this comment chain) said top and bottom broken. If the walls are somehow firmly fixed forever no matter how much force they experience, and are not subject to thermal degradation, then we have a square pipe with 3m sides and infinite length. If the walls break down then it’s also infinite diameter.
In terms of modelling it there’s a FOSS option openfoam.org but I don’t know how to use it and don’t have time to mess about with it right now.