Question #403426 on Yade changed:
https://answers.launchpad.net/yade/+question/403426
Status: Open => Answered
Bruno Chareyre proposed the following answer:
Hi,
I understand the meaning my not be immediate but it is actually relatively
simple.
Let w be the spin vector of the grain pair.
Decompose this spin into normal and orthonormal components w= w_n + w_t. the
rotation of any vector quantity attached to the pair can be approximated by v
= v + w×v = v + w_n×v + w_t×v (cross products)
In the doc the first cross-product is called (△uT) 2 and the second one is
called (△uT) 1.
Bruno
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