[aspect-devel] [ASPECT] Definition of velocity gradient

[Timo Heister]

Sylvia,

the gradient in deal.II is defined as (\nabla u)_{ij} = \partial u_i /
\partial x_j which is typically returned in a Tensor<2,dim>.

Note that we use the symmetric gradient of the velocity in the Stokes
formulation so I can't think of a case inside ASPECT where this
information matters.


On Wed, Jun 3, 2015 at 4:00 AM, Sylvia Rockel
<sylvia.rockel at fu-berlin.de> wrote:
> Dear all,
>
> does anybody have a clue which definition of the velocity gradient
> is used within ASPECT? Is it
>
> (\nabla u)_{ij} = \partial u_i / \partial x_j
>
> or
>
> (\nabla u)_{ij} = \partial u_j / \partial x_i.
>
> Thanks a lot.
>
> Best,
> Sylvia
>
>
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-- 
Timo Heister
http://www.math.clemson.edu/~heister/