yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

On 25 February 2011 17:28, Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>wrote:

>
> > Well, I have to disagree here. I think we need first to clearly define
> > our equation, is it a linear or non linear one?
>
> It doesn't matter. If it is non-linear, you can linearize it by looking
> at tangent stiffness. So, in the end the small oscillations that can
> result in numerical instabilities are always ruled by something linear,
> like:
>
Ok, thanks for pointing it out.
Chiara

>
> $$a\ddot{X}+b\dot{X}+X=0$$
>
>
> We used this approach successfully for JF Jerier non-linear law (without
> viscosity).
>
> Bruno
>
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