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[Luc Sibille <question271301@xxxxxxxxxxxxxxxxxxxxx>]

Question #271301 on Yade changed:
https://answers.launchpad.net/yade/+question/271301

    Status: Open => Answered

Luc Sibille proposed the following answer:
Hi,
In my opinion formula 3 in the paper is misleading, it give the relative velocity u between the two particles (including a normal un and a tangential/shear component us), but not directly the shear relative velocity.
To find the shear componant you need to project u on the normal to the contact to find the normal component, and then substract this normal relative velocity to the total one u, to finally obtain the shear component.
The different steps are detailed here:
https://yade-dem.org/doc/formulation.html#shear-strain
Best,
Luc

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