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

[Sylvia Rockel]

Hi Timo,

thanks a lot. I'll send you the details directly in a sec, as this is all
about my PhD thesis.

Best,
Sylvia


> 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/
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