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[Anton Gladky <806944@xxxxxxxxxxxxxxxxxx>]

> While comparing linear models, I get difference factors of about 2e12
> ... 3e12 !!!
>
> Can someone please check my script, I think in this case I did a mistake
> (see attachment).

Hi, sorry, I do not have an opportunity for the moment to check your
script in details.
But in ViscElMat all parameters are multiplied by the mass of
particles. It can cause a difference.
Please, have a look at ViscoelasticPM.cpp, lines 24-27 [1]

Actually, thanks for pushing us to double-check the code.

[1] http://bazaar.launchpad.net/~yade-
dev/yade/trunk/view/head:/pkg/dem/ViscoelasticPM.cpp#L24

Anton

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https://bugs.launchpad.net/bugs/806944

Title:
  different behavoir of Hertz model while comparing PFC and YADE

Status in Yet Another Dynamic Engine:
  Confirmed

Bug description:
  Hello,

  During verifiing my model I compared output from PFC 4.0 with the
  output from YADE (bzr2877 on Debian Squeeze 64bit). There I found a
  different behavior between these two programs. I dont know if this is
  a bug or not, but I hope someone can explain the different behavior.

  The model itself is very simple. There are two spheres, an upper one and a lower one. The lower one is fixed and the upper one is falling down to the lower one, collides and jumps back. The value of interest is the flyback height of the upper particle.
  In PFC I measure higher values of flyback height, then in YADE (see log-files in the attachment).

  Can someone tell me why there is a difference in the flyback height?
  (input parameters are the same for both programs ... see caller_two-spheres-jumping.dat for PFC and two-spheres.py for YADE)

  Regards,

  Christian Jakob

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