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[jduriez <question233349@xxxxxxxxxxxxxxxxxxxxx>]

Question #233349 on Yade changed:
https://answers.launchpad.net/yade/+question/233349

    Status: Open => Answered

jduriez proposed the following answer:
Hi,

- Concerning first the 2) of your first post, that I forgot previously
(relationship between gamma and shearSpeed), have in mind that this
"shearSpeed" has the unit of length divided by *time*, and not length
divided by *DEM-iteration*. See l.179 of your script.

- Concerning the sudden change in the sign of the horizontal force :
During the first "nCycShear " iterations, shearing takes place, while between O.iter = nCycShear and O.iter = 1.15*nCycShear, the sample is at rest. If the horizontal force evolves during this time (even changes its sign), I would say that the shearing was too fast, preventing the sample to be at (quasi-)equilibrium...

- And I have unfortunately no idea at all to explain the difference in
calculation speed you observed changing O.run(20000)... (and still not
Yade on my current PC)


Finally have in mind that this script I uploaded is intended only to provide a quick illustration of the Engines I wrote (and to show that we can simulate with Yade other tests than triaxial ones ! ;-) )

The mechanical results obtained with this script (because of the number
of spheres -you increased, but maybe not sufficiently - and speed - you
increased too...) correspond surely to nothing.

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