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[Chiara Modenese <question156756@xxxxxxxxxxxxxxxxxxxxx>]

Question #156756 on Yade changed:
https://answers.launchpad.net/yade/+question/156756

    Status: Open => Answered

Chiara Modenese proposed the following answer:
Hi Mark,

On 9 May 2011 15:21, Mark S. Bentley
<question156756@xxxxxxxxxxxxxxxxxxxxx>wrote:

> New question #156756 on Yade:
> https://answers.launchpad.net/yade/+question/156756
>
>
> I've been playing with YADE for a few days now, and think I have a handle
> on the basic way simulations are set up and run - but now I need to dig into
> the details to see if it's suitable for my application. Basically I want to
> model the behaviour of cohesive aggregates of fine particles under low
> gravity, and am trying to figure out if YADE is well suited for this.
>
> I see that the Hertz-Mindian law includes adhesive energy, but is this only
> for the "pull off" of particles? Does it include the attractive force
> between particles due to the Van der Waals forces prior to the onset of the
> repulsive "contact" region, for example?
>
No, it does not include that. It only considers the attraction between
particles as long as the contact physically exists. The need for distant
interactions really depends on the type and scale of the problem. From a
physical point of view, it is very difficult to deal with transition between
long-range interactions and contact body forces of both repulsive and
attractive origin. My personal suggestion is: make sure you understand
physics, limitations and assumptions behind the choice of your contact
model.


> Ideally I would like to model the purely attractive VdW forces down to a
> critical distance, and then include both attractive and
> repulsive/frictional/etc. forces thereafter (since the attractive forces
> drop of quickly I guess it's only a nearest neighbours problem, with a
> cut-off for larger distances anyway). Is this possible?
>
Yes, it is possible. Have a look at
https://yade-dem.org/doc/yade.wrapper.html?highlight=detection#yade.wrapper.Ig2_Sphere_Sphere_ScGeom.interactionDetectionFactor

HTH,
Chiara

Any thoughts or hints appreciated :)
>
> Thanks, Mark
>
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