yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Václav Šmilauer a écrit :
> > Is somebody planning to simulate 
> > high-spin clumps by the way?
> >     
>
> In a sense, high spin just makes the critical timestep smaller, so that
> leap-frog is still stable, right? ...
>   
Not sure of that. Critical dt is linked to elastic vibrations, not to 
absolute value of velocities/spins (except for high speed impacts where 
you don't want bodies to go through each other in 1 step).

My point was :
- If we simulate problems were clumps go from one almost-equilibrium 
position to another, or even flow steadily, then we can safely ignore 
the w'*Iw' term and use explicit equations.
- If we simulate problems where some clumps rotate at high speed and 
where the exact trajectory matters, then this approach is wrong, even if 
stable numerically.

Bruno




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