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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Vaclav and Bruno are perhaps not accustomed to these notations that come from fluid modeling at the atom's scale (I think).
>   
Indeed. For me, it looks like a complex way to write simple things. ;-)
I would call this "proportional transformation" (homothétie in french).

If the displacement (resp. velocity) at the boundary is "u", then the 
displacement (vel) at the center should be "u/2".
Correct?

Bruno


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