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[Leonard <question694664@xxxxxxxxxxxxxxxxxxxxx>]

New question #694664 on Yade:
https://answers.launchpad.net/yade/+question/694664

Hi,
I have a sand model with extral tiny particles among the pore space of the sample, and I use this model for triaxial compression test. The boundary condition is simulated by six rigid walls (use walls=aabbWalls([mn,mx],thickness=0,material='FrictMat')).  And I use GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8) for setting the dt.

However, I found that at the end of the simulation (where axial strain = 40%), many tiny particles stay at their original places, which means that these tiny particles didn't react with the boundary wall during the simulation, the example figure could be find at [1].

I guessed it is that there was no contact detection between these tiny particles and the top wall so that these particles passed through the top wall. Then I set the timestepSafetyCoefficient from 0.8 to 0.1 to decrease the dt (not sure if it is correct), but I gained the same result as [1] shows.

My questions are: (1) The higher the timestepSafetyCoefficient, the more safe the dt is? Or the lower the timestepSafetyCoefficient, the more safe the dt is? (2) Is there any other way to let the missed contacts being detected correctly during the simulation?

Thanks very much!

Leonard
[1]https://we.tl/t-SRQDF5JLh8


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