Question #271394 on Yade changed:
https://answers.launchpad.net/yade/+question/271394
Status: Answered => Open
Alexander is still having a problem:
Hello, Luc. Thank you for your response.
So now i have 3 questions:
1) Do i understand correct that in the incremental form we have
following computation formulas for moments:
dO = (w_1 - w_2)dt - is the rotational vector during the time increment
dt between two simulation steps, w_i - are rotational velocuties at time
t_0 + dt
dO_t = (d_n*n)n - is twisting component, which is the projection of
dOmega to the normal of the contact at time t_0 + dt
dO_b = dO - dO_n - is the bending component, which lies in the contact
plane:
twisting increment dM_t = k_t * dO_t - total twisting at time t+dt: M_t
= M_t + dM_t
bending increment dM_b= k_b * dO_b - total bending at time t+dt: M_b =
M_b+ dM_b
2) How these formulas look like for non-uncremental form. Is it just simple
replacing M with dM, i mean at step t+dt
we just compute M_t and M_b directly?
M_t = k_t * dO_t - twisting
M_t = k_t * dO_t - bending
3) If Law2_ScGeom6D_CohFrictPhys_CohesionMoment::momentRotationLaw
=False then there is now angular velocities (w_i=0) of particles and
shear displacement is computed without part of angular velocitiues (only
displacement of sphere centers)?
with regards, Alexander
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