[vtk-developers] how to handle FEM data in VTK?

[Pierre JUILLARD]

Hi Will,

I thank you for your help! This paper is indeed very interesting.

I think that it contains many answers to my problems. However, I do not
really see how to make use of this framework yet.
- are there somwhere some tutorials listing the classes to be used, and
giving some examples of how to manage FEA results with them? (somehow
something close to the pdf I sent previously)
- can the data structure be then used in ParaView? I guess that specific
filters may have to implemented, haven't them?

Thank you again,
Best regards,

Pierre


2008/7/8, Will Schroeder <will.schroeder at kitware.com>:
>
> Please read the paper http://www.vtk.org/pdf/AdaptorFramework.pdf. This
> may help shed light on the topic. The point is, rather than trying to
> shoehorn FEM data structures into VTK (which is not pretty), you can build
> adaptors from VTK to native FEM codes and data structures.
> W
>
> 2008/7/3 Pierre JUILLARD <pierre.juillard at gmail.com>:
>
>>  Hi all,
>>
>> I would like to have information about the best way to handle FEM data in
>> VTK file.
>>
>> Mainly, we use shell meshes (triangles or quadrangles) and the following
>> data would be manipulated in VTK:
>> - reduced element or fully integrated (1 or 4 integration point in the
>> neutral fibre)
>> - different integration point over thickness per element (1, 3, 5, 7, 9,
>> 11, ...)
>> - different integration algorithms over thickness (GAUSS, SIMPSON, ....)
>> defining different weight and locations of these integration points over
>> thickness
>> - stress tensor at each integration point over thickness
>> - strain tensor at each integration point over thickness
>> - effective plastic strain at each integration point over thickness
>> - thickness at each integration point in the neutral fibre
>> and possibly additional results per integration points...
>>
>> This topic seems to have already been tackled.
>> Indeed, I have read several posts about the vtkLSDynaReader class, as well
>> as its documentation on
>> http://public.kitware.com/VTK/doc/nightly/html/classvtkLSDynaReader.html
>>
>> As it is indicated in one of the post, the ultimate goal would be to
>> benefit from vtk format/library to manipulate FEM data, and  from ParaView
>> as PostProcessor
>>
>> However, from these posts, it seems that VTK is not really fitted to store
>> FEM data, and for such a purpose, a good knowledge in VTK is necessary. It
>> may also be necessary to extend it.
>>
>> Most notably, it seems currently possible to have only one scalar field,
>> vector field, and tensor field per element. In the last VTK versions, has
>> this "limitation" been overriden?
>> Is it possible to store several fields of different types per element?
>>
>> Would you have some advices about the best way to proceed?
>> Is there somewhere some guidelines/tutorials?
>>
>> It the VTK format has still some limitations, is it foreseen to override
>> them in the next release?
>>
>> I thank you for your help.
>>
>> Cheers,
>>
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>>
>>
>
>
> --
> William J. Schroeder, PhD
> Kitware, Inc.
> 28 Corporate Drive
> Clifton Park, NY 12065
> will.schroeder at kitware.com
> http://www.kitware.com
> 518-371-3971 (phone and fax)
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