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[Question #175394]: numerical instability and small time steps

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From: Christian Jakob <question175394@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 20 Oct 2011 08:45:36 -0000
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New question #175394 on Yade:
https://answers.launchpad.net/yade/+question/175394

Hi,

I am wondering about numerical instabilities of YADE. As you know I am working with PFC and YADE. For one and the same model I get time steps about 3e-7 [s] for PFC and 2e-9 [s] for YADE! This is more than factor 100. Nethertheless I can run the model, but if timeStepUpdateInterval in GlobalStiffnessTimeStepper is too big (100), than the model gets instable. Spheres fly through the facets and the model "explodes" with velocities > 10 km/s.

Any hint, what I might do wrong?

Thanks,

Christian

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