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Dry sand, density of initial grains

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How is the initial volume related to the volume of the sand when the simulation is stable ?

For example, when I start with a pyramid using a 30 degrees angle, I expect the final pile of sand to to look about the same; however it's collapsing a lot. I don't understand where the particles go, or whether there was space in between the particles to begin with. Can you hint me on how to setup a pyramid that will collapse to about the same footprint ?

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