[Paraview] Gauss points

[Marios Mavros]

Hi Burlen,

Your example was really helpful to understand many thing about the xml
format and I want to thank you about that, but I still have some questions.

1. What the numbers 0 4 8 12 (line 24) represent?
2. What the QuadratureWeights are all zero (line 37)?
3. In your example there are 4 cells with 4 Gauss points in each cell. In
total 16 Gauss points. If I want to assign to each Gauss point one value of
stress or strain how I have to write those 16 values in xml format. Can you
please sent me an example with this information?

Thank you very much

Marios


On Sat, Nov 30, 2013 at 4:28 PM, Burlen Loring <bloring at lbl.gov> wrote:

>  Hi Mario,
>
> sending again to the list. the weights have 2 dimensions i (node id) and j
> (Gauss point id), so to generate ShapeFunctionWeights for a new
> QuadratureSchemeDefinition  what you do is evaluate each shape function at
> each Gauss point. For the linear quadrilateral you'll end up with 16
> weights. For example see the example
>
>
> http://www.hpcvis.com/vis/images/vtk-quadrature-points-example/vtk-quadrature-points-example.pdf
>
> http://www.hpcvis.com/vis/images/vtk-quadrature-points-example/quadrature-points-example.vtu
>
> Burlen
>
>
> On 11/29/2013 3:34 PM, Marios Mavros wrote:
>
> Hi Burlen,
>
>  I want to thank you for the information that you send me. I read the
> paper and I try to made a simple example in xml format for a 4 node
> quadrilateral element but it didn't work for me. Attached you will find the
> element formulation that I used with the shape functions and a .vtu file
> with my example. If I want to give 4 stress values in the 4 Gauss points (
> lets say 0.1 0.2 0.4 -0.1) can you please write in the .vtu file the
> missing information in order to understand haw I have to write a correct
> file in xml format.
>
>  Thank you very much
>
>  Marios Mavros
>
>
> On Wed, Nov 27, 2013 at 2:56 PM, Burlen Loring <bloring at lbl.gov> wrote:
>
>>  You'll need to use an XML file format. There's some documentation in the
>> following link. It's slightly dated but should get you started.
>> http://www.vtk.org/Wiki/images/7/78/VTK-Quadrature-Point-Design-Doc.pdf
>> The ctest, VTK/Filters/General/Testing/Cxx/TestQuadraturePoints.cxx,
>> could be used as an example.
>>
>>
>> On 11/27/2013 02:32 PM, Marios Mavros wrote:
>>
>>  Hi
>>
>>  I have wrote a simple program in Fortran that transform the output of a
>> finite element software in vtk Legacy Format. I don't know how to handle
>> the Gauss points values. For example in my case my cells have 4 Gauss
>> points and I have 4 values (for example strain in x-direction) for each
>> cell. How I have to write the vtk file taking into account that each cell
>> has many Gauss points?
>>
>>  Thank you
>>
>>  Marios
>>
>>
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