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[Raphaël Maurin <question234450@xxxxxxxxxxxxxxxxxxxxx>]

New question #234450 on Yade:
https://answers.launchpad.net/yade/+question/234450

Hi all, 

I am using Yade in order to simulate bed load transport, i.e. granular flows driven by a turbulent fluid shear stress. For that, I am using the contact law Law2_ScGeom_ViscElPhys_Basic to take into account the dissipation occuring at contact in this dynamic situation. 

I modified this contact law, in order to make it be like the classical spring-dashpot law which is used in granular flow modelling, and I want to commit this changes. However this modification induces a change in the calculation of the equivalent contact stiffness and damping. In particular, I removed the weighting by the particles mass of the spring (and damping) contact parameter (it gave k = (m1k1 m2k2)/(m1k1 + m2k2)), which was surprising (not homogeneous to a stiffness/damping) and does not correspond to the classical spring-dashpot law (which is rather k = (k1 k2)/(k1 + k2))
I did some other changes, mainly to make the ViscElMat class inherits from FrictMat, which changes the formulation (young and poisson modulus instead of normal and tangential stiffnesses) but does not affect the physics. 

My question is then : Is anyone using this law ? Is it a problem for anybody if I commit this changes ? 

Thank you,
Best regards

Raphael


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