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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Come on folks! You have thousands of available web pages explaining what 
the velocity gradient is. There is really nothing special.
An example here (paragraph 2 : velocity gradient) :

http://en.wikiversity.org/wiki/Continuum_mechanics/Time_derivatives_and_rates

Bruno

> Agree, velGrad does not really return the meaningful.