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Definition of the variation of velocity gradient in Abaqus

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  • Definition of the variation of velocity gradient in Abaqus

    I am confused by the definition of the variation of the velocity gradient in the Abaqus Theory Manual (4.6.1).

    Normally var(L) = var(grad(v)) = grad(var(v)); where var denotes the variational operator. But in the manual it is given as var(L) = grad(var(u)); where u is the displacement field.

    Could someone explain how the definition in the Abaqus theory Manual came about? I have attached a screen capture of the specific part of the manual.

    Thank You
    Feby

    Click image for larger version

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    Sapere Aude!

  • #2
    You are right - that is odd. They must define u as velocity field velocity. Otherwise L would not be the velocity gradient.
    I would double check the Abaqus definitions...

    -Jorgen
    Jorgen Bergstrom, Ph.D. PolymerFEM Administrator

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