yade-dev team mailing list archive

[Václav Šmilauer <eudoxos@xxxxxxxx>]

> A reference for this global damping can be found in PFC3d manual
> (chapter Theory and background) where they propose:
> 
> Fdi=-λ|Fi|sgn(vi)      (***)
Didn't you make some mistake? In Yade, sgn(Fᵢvᵢ') is + if they have the
same direction and - if opposite. sgn(vi) would be + if moving +x and -
if moving -x...? I suppose you meant Fdi=-λ Fi sgn(Fi vi) ?

> so basically the same as in Yade (**). The two formulations act
> exactly in the same manner (they oppose the motion), I suppose that is
> just a matter of efficiency to choose the (**) equivalent to (***).


I downladed demo of PFC3D to have the manual but I am unable to extract
it from the MSI installer file. Some day I will get ot windows machine
and will get it officially ;-)

Thanks, v.