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[Fu zuoguang <question245062@xxxxxxxxxxxxxxxxxxxxx>]

Question #245062 on Yade changed:
https://answers.launchpad.net/yade/+question/245062

Fu zuoguang gave more information on the question:
Dear Bruno Chareyre:
      Thanks for helping me last time and the two papers you gave me provided a chance for me to get a little of your advices. In 'yade background', The total uT can be decomposed into two parts, one is caused by the reference frame motion ( (△uT)1+(△uT)2  ) and the other is uniquely effectly by the relative motion of spheres in reference frame ((△uT) 3). 
The latter gave me the same meaning as I noticed it in [luding2008]. But I can not understand why the the former should be calculated as what is just said in  'yade background'. 
the vector 'C-C0' can also represent the reference frame motion as I known and the 'C', as the coordinates of contact point in the currect step are calculated before the starting of uT calculation. 
Seeking your help!

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