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Re: [Question #647591]: a mistake of GlobalStiffnessTimeStepper of timestep updation?

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From: Jan Stránský <question647591@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 12 Jul 2017 16:43:28 -0000
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Question #647591 on Yade changed:
https://answers.launchpad.net/yade/+question/647591

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

according to your description, everything seems OK to me.

PWaveTimeStep just do something like
min(radius/sqrt(young/density) for b in O.bodies)
i.e. choosing minimum time step based on **spheres** particles density, size and stiffness.

If you clump two spheres together, they have higher mass and therefore
theoretically higher critical time step (radius and stiffness are
preserved). It is not recognized by PWaveTimeStep, but
GlobalStiffnessTimeStepper takes care of it [2]

cheers
Jan


[1] https://github.com/yade/trunk/blob/master/pkg/dem/Shop_01.cpp#L410
[2] https://github.com/yade/trunk/blob/master/pkg/dem/GlobalStiffnessTimeStepper.cpp

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