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Here's a nice setup from VideoCopilot for your exact need. It's not too hard to build and works really well:

This is more of a material/geo R&D, not particle simulation. Vue and Gaia have their own algorithms to simulate Wind Erosion on landscapes. You can literally turn any landscape in dunes desserts in real-time as you iteratively apply the same effect. And here's a recent hack on making dunes in C4D... I prefer material solutions but some people might like it this way... Butt this of course is a macro example. If you need an hour-glass simulation you'd need particles

It's not very intuitive, but use the 'Flock Modifier' to set a separation between particles. I guess it's not really the same as particle-to-particle-collision, but good enough for piles of sand etc.

dear members, forum is upgraded, we will be working on all little issues as we go. You can freely post and enjoy the forums!