Question #693446 on Yade changed:
https://answers.launchpad.net/yade/+question/693446

Rohit John posted a new comment:
Thanks for you answer Bruno.

I have read that most of the constitutive laws do no have a velocity
base damping [1]. Is there a reason why velocity base damping  was not
implemented?

I apologise, I did use gridConnectio/gridNodes to make the brush. I used
CylinderConnections to do it. I always get it confused with
chainedCylinders.

 Could you please check if my proposal to implement damping is correct. 
  - Define a material class which includes a damping parameter. Since I am 
using CylinderConnections I can inherit the class CohFrictMat and name it, say, 
ViscCohFrictMat
  - Define a Iphys defining the interaction between two instances of this 
material class. I can inherit Ip2_CohFrictMat_CohFrictMat_CohFrictPhys() and 
lets call it Ip2_ViscCohFrictMat_ViscCohFrictMat_ViscCohFrictPhys()
  - Define a law to define the forces based on the ScGeom6D Igeom and 
ViscCohFrictPhys() Iphys, and inherit the 
Law2_ScGeom6D_CohFrictPhys_CohesionMoment()



[1] 
https://yade-dem.org/doc/formulation.html?highlight=damping#numerical-damping

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