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[Paul Pircher <question695058@xxxxxxxxxxxxxxxxxxxxx>]

Question #695058 on Yade changed:
https://answers.launchpad.net/yade/+question/695058

    Status: Answered => Open

Paul Pircher is still having a problem:
Hello,
thanks for you thoughts and sorry for the late reply. 
I tried several things to see how the mass is computed. It turns out there might be even more confusion.

If only nodes are added to the simulation, none of them have any mass at all (0.0kg).
As soon as CylinderConnections are added the nodes and the cylinders receive a mass, that is "incorrectly" computed as shown above. 

The point that they overlap is a good one. This might be the reason for
a higher mass in the simulation, but as you already have shown this
doesn't lead to a valid result either.

I found a paper that deals with those connections in yade [1]. 
In there it is told that "The mass of the cylinder element is lumped into its two nodes."
Which would explain the higher masses of the nodes, but on the other hand would mean that the cylinders don't have any mass at all. 
Did I intrepret that correctly? 
Is the paper acutally refering to this exact yade-functions or did they use something else? 
Since they used nodes and cylinder connections I thought this might be the same approach.

Would you mind sharing your thoughts on that?

Thanks for your help and best regards,
Paul

[1]
https://www.researchgate.net/publication/282996677_A_general_method_for_modelling_deformable_structures_in_DEM

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