As you can see, this is also a problem involving *int32_t* integer overflow. I am not worried about this overflow problem hindering simulation accuracy as long as it does not happen, meaning the past simulations you did should still be fine. The interesting thing is it can happen when you change seeming unrelated parameters such as Young's modulus, and that is because those parameters affect the user unit--simulation unit conversion rate, so when the mass is small enough, domain is big enough and stiffness is large enough, it's just right for it to overflow. For what it's worth, I want to point out we don't do this unit conversion in our perspective new generation DEM solver anymore.
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