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Re: [Question #615644]: density and time-step

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question615644@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Apr 2017 15:58:23 -0000
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Question #615644 on Yade changed:
https://answers.launchpad.net/yade/+question/615644

Bruno Chareyre posted a new comment:
>I'd like to change the particles' density to increase per calculation
time-step

It will not work, I'm sorry. If it was working everyone would set infinite density and get results in zero time.
The way it will not work depends on your specific problem but typically: 1/ if you impose forces, everything will move so slowly that it will need much more total simulation time to achieve the same final state; 2/ if you impose displacements the inertia will be so large that every little movement will generate huge inertial forces.
There is no simple way to speedup DEM appart from decreasing the stiffness/force (or stiffness/stress) ratio.
Bruno

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