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[Kneib François <1261388@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hi,

I think there is a mistake into the code comment : Ip2_FrictMat_FrictMat_FrictPhys.cpp line 40.
According the the documentation [https://yade-dem.org/doc/formulation.html#normal-stiffness] and the code, it seems that this Ip2 uses :

Li = 2 * Ri           (i is a sphere)

as a typical length to transform Young modulus into stiffness :

Ki = Li * Ei = 2 * Ri * Ei

But into the code comment (L40), it's written : "(Ri.Ei/2) is the
stiffness of a contact point on sphere "i", and to my mind it should be
"(Ri.Ei*2) ..."

Don't you think so ?

** Affects: yade
     Importance: Low
         Status: New

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https://bugs.launchpad.net/bugs/1261388

Title:
  Wrong code comment

Status in Yet Another Dynamic Engine:
  New

Bug description:
  Hi,

  I think there is a mistake into the code comment : Ip2_FrictMat_FrictMat_FrictPhys.cpp line 40.
  According the the documentation [https://yade-dem.org/doc/formulation.html#normal-stiffness] and the code, it seems that this Ip2 uses :

  Li = 2 * Ri           (i is a sphere)

  as a typical length to transform Young modulus into stiffness :

  Ki = Li * Ei = 2 * Ri * Ei

  But into the code comment (L40), it's written : "(Ri.Ei/2) is the
  stiffness of a contact point on sphere "i", and to my mind it should
  be "(Ri.Ei*2) ..."

  Don't you think so ?

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