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[Chiara Modenese <question205137@xxxxxxxxxxxxxxxxxxxxx>]

Question #205137 on Yade changed:
https://answers.launchpad.net/yade/+question/205137

    Status: Open => Answered

Chiara Modenese proposed the following answer:

On 6 Aug 2012, at 15:41, mer samuel wrote:

> New question #205137 on Yade:
> https://answers.launchpad.net/yade/+question/205137
> 
> Hi,
Hi Samuel,
> 
> I study the impact of sphere on a granular medium. To understand how the Elastic Contact law works I am currently simulating
> impacts involving only two spheres, one is set as the substrate which is fixed and the other one is the incident sphere.
> During my simulation I observe that for Vin bigger than 2 m/s the energetic restitution coefficient is always 1 whatever the incident angle is (from 5 to 80 degrees with respect to the horizontal). 
Is the coefficient of restitution with respect to the tangential or normal direction you are referring to? Do you have any friction or damping at all? You need to present your problem with more details and tell us where you think the problem lies.

> I tried to look in the literature to get more detail about the contact law but I didn't find anything to explain such a phenomena.
> If you have any hints it would be really helpful.
Look for the references of Colin Thornton (Powder Technology, 2011-2012), from my prospective he has very recently published some excellent work on the comparison of contact models after impact analysis.

Chiara

> 
> Samuel
> 
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