Hello,

My plan is to simulate a slowly evolving granular system, with time scales 
of days for the frame rendering, and the whole simulation would probably 
cover several hundreds of days.

Since the DEM time step is usually very low (~1e-5s), I was thinking of 
scaling down the time. In other words, I would accelerate the process. 

But I have now several questions:

- First, is it the solution you recommend?
- Since I really do not want to impact the physics of the phenomena in the 
system, what should I scale as well? I use material-based properties for 
the simulation. I guess the gravity would have to be scaled, what about the 
material properties?
- How do I choose the acceleration factor? 1 day could be represented by 
1e-5s, 1s, 10s, etc. What kind of criterion is usually used?

Thank you,
Yves

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