yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

If the objective is to define the critical timestep, for the sake of
clarity I recommend to not speak about:
- equivalent mass (the paper sent by Vincent earlier),
- critical damping,
- over-damped / under-damped,
- restitution coefficient.

They are beside the scope as long as the question is "how to define in
general a critical time-step for 2nd order explicit integration of
acceleration-velocity-position=0?".

Also, any reasoning based on one unique contact is invalid here. It
would oversestimate the critical timestep, because what counts is the
global viscosity of all contacts on one particle (similarly, what counts
for stability is the global stiffness of all contacts on a particle in
current timeStepper).

Cheers.

Bruno