[vtkusers] parallel mesh reading and writing

[Karl Merkley]

On Jan 25, 2007, at 10:32 AM, John Shalf wrote:

>
> I think CEI has taken over maintenance/development of the parallel  
> HDF5 mesh readers and writers.  There have been parallel HDF5 mesh  
> reader/writers in CEI since approx Ensight 7.6.

> -john

Thanks for the update on that.  I may have contacted the wrong person  
at CEI or maybe they've just gone and done their own thing without  
trying to make it an open standard?

      Karl
>
> On Jan 25, 2007, at 7:12 AM, Karl Merkley wrote:
>> On Jan 25, 2007, at 3:38 AM, Jean Favre wrote:
>>
>>> On 25, Jan 2007 11:27 AM, John Biddiscombe <biddisco at cscs.ch> wrote:
>>>
>>>
>>>> If the geometry is fixed for subsequent time steps, then the  
>>>> scalars
>>>> can
>>>> be written out as groups in time order. If the geometry is  
>>>> changing,
>>>> new
>>>> groups would need to hold geom and scalars per time step. some
>>>> convention would need to be agreed on on how to lay it out.
>>>
>>> Someone has already gone through this effort. Check out the  
>>> following
>>> link which might be helpful
>>>
>>> http://hdf.ncsa.uiuc.edu/HDF5/papers/prototypes/mesh/
>>>
>>
>> I have followed through on that link previously.  They document  
>> one possible arrangement but it appears that the effort has not  
>> been pursued since the prototype proposal in 2002.  The mailing- 
>> list is dead and one of the principals indicated in a private  
>> email that he had done nothing more.  If someone knows more than  
>> this I would still be interested.
>>
>> I have also investigated a couple of other possibilities.
>>
>> XMDF (not to be confused with XDMF!) is an open source project  
>> with maintenance funded by the US Army Corp of Engineers.  It is  
>> primarily used for ground water modeling although it appears to be  
>> useful as general mesh storage format. I'm not yet sure how  
>> complete the data model is for an arbitrary FE model (boundary  
>> conditions, material properties, etc.)
>>
>> Another option may be CGNS (CFD General Notation System).   This  
>> is promoted by NASA and according to their website they are now a  
>> "AIAA recommended practice."   It appears they are in transition  
>> to an HDF5 based model but they are still supporting an alternate  
>> system during the full transition.  Once I stumbled across CGNS I  
>> actually found a thread on this list talking about it.  I will  
>> follow through up on that old thread.
>>
>>     Karl
>>
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