[Paraview] [Non-DoD Source] XDMF and nested Grid Collections (UNCLASSIFIED)

Tue Feb 14 09:52:37 EST 2017

CLASSIFICATION: UNCLASSIFIED

Alessandro,

This looks like a useful feature to add to the reader, and we will put in our 
list of things to work on. But, I can not immediately implement this as we 
have a number of high priority updates such as c++11 support, and an updated 
base Xdmf library currently pending.

Thanks,

Joe

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joseph G. Hennessey Ph.D., SAIC
Team SAIC
Army Research Lab
DOD Supercomputing Resource Center

-----Original Message-----
From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Alessandro 
De Maio
Sent: Tuesday, February 14, 2017 9:21 AM
To: paraview at paraview.org
Subject: [Non-DoD Source] [Paraview] XDMF and nested Grid Collections

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________________________________

Hi,

I'm trying to export from a parallel MPI CFD code a set of results using 
xdmf/hdf5 format in order to be read in Paraview.
The computational domain is divided into several parts (unstructured 
polyhedral grid) and the idea is to write a xdmf  with a further subdivision 
to be read in parallel by mpi paraview.
So it's a nested subdivision in which the external level is based on different 
parts of the domain (that should be extractable in Paraview after the reading) 
and each part is divided into a number of chunks equal to the number of 
processes of the parallel Paraview execution. With such a subdivision, reading 
this file with a parallel Paraview execution, each Paraview process loads a 
fraction of each part and, if all the chunks of each part have the same 
dimension, all the Paraview processes are balanced.

In the following there is an example for two parts and two Paraview processes.

I've used nested Grid Collections of type Spatial and it seems that everything 
is ok but the problem is that in Paraview the names of the first level 
collection items  is lost (in the following example  tet_cell1 and tet_cell2) 
and these items are called "Block 0" and "Block 1". The leaf elements of the 
tree instead (Grid_01, Grid_02, ...) mantain their correct name.

I've tried also to change the GridType of the external level from Collection 
to Tree (that should be supported in the xdmf data format) but in this case 
the item in Paraview is empty (0 cells and 0 nodes).

Is there any error in my procedure? It's the first time that I use xdmf.

Thank you in advance for your help.

Alessandro

<?xml version="1.0" encoding="utf-8"?>
<Xdmf xmlns:xi="Caution-http://www.w3.org/2001/XInclude < 
Caution-http://www.w3.org/2001/XInclude > " Version="3.3">
  <Domain>
    <Grid Name="all" GridType="Collection" CollectionType="Spatial">
      <Grid Name="tet_cell1" GridType="Collection" CollectionType="Spatial">
        <Grid Name="Grid_01" GridType="Uniform">
          <Geometry Origin="" Type="XYZ">
            <DataItem DataType="Float" Dimensions="89724 3" Format="HDF" 
Precision="4">../positive/xdmf/tet_cell1.h5:Data0</DataItem>
          </Geometry>
          <Topology Dimensions="16797" Type="Mixed">
            <DataItem DataType="Int" Dimensions="1271390" Format="HDF" 
Precision="8">../positive/xdmf/tet_cell1.h5:Data1</DataItem>
          </Topology>
          <Attribute Center="Node" Name="pressure-udf" Type="None">
            <DataItem DataType="Float" Dimensions="89724" Format="HDF" 
Precision="4">../positive/xdmf/tet_cell1.h5:Data2</DataItem>
          </Attribute>
        </Grid>

        <Grid Name="Grid_02" GridType="Uniform">
          <Geometry Origin="" Type="XYZ">
            <DataItem DataType="Float" Dimensions="31633 3" Format="HDF" 
Precision="4">../negative/xdmf/tet_cell1.h5:Data0</DataItem>
          </Geometry>
          <Topology Dimensions="5866" Type="Mixed">
            <DataItem DataType="Int" Dimensions="444229" Format="HDF" 
Precision="8">../negative/xdmf/tet_cell1.h5:Data1</DataItem>
          </Topology>
          <Attribute Center="Node" Name="pressure-udf" Type="None">
            <DataItem DataType="Float" Dimensions="31633" Format="HDF" 
Precision="4">../negative/xdmf/tet_cell1.h5:Data2</DataItem>
          </Attribute>
        </Grid>
      </Grid>

      <Grid Name="tet_cell2" GridType="Collection" CollectionType="Spatial">

        <Grid Name="Grid_01" GridType="Uniform">
          <Geometry Origin="" Type="XYZ">
            <DataItem DataType="Float" Dimensions="87146 3" Format="HDF" 
Precision="4">../positive/xdmf/tet_cell2.h5:Data0</DataItem>
          </Geometry>
          <Topology Dimensions="16407" Type="Mixed">
            <DataItem DataType="Int" Dimensions="1234254" Format="HDF" 
Precision="8">../positive/xdmf/tet_cell2.h5:Data1</DataItem>
          </Topology>
          <Attribute Center="Node" Name="pressure-udf" Type="None">
            <DataItem DataType="Float" Dimensions="87146" Format="HDF" 
Precision="4">../positive/xdmf/tet_cell2.h5:Data2</DataItem>
          </Attribute>
        </Grid>

        <Grid Name="Grid_02" GridType="Uniform">
          <Geometry Origin="" Type="XYZ">
            <DataItem DataType="Float" Dimensions="30317 3" Format="HDF" 
Precision="4">../negative/xdmf/tet_cell2.h5:Data0</DataItem>
          </Geometry>
          <Topology Dimensions="5661" Type="Mixed">
            <DataItem DataType="Int" Dimensions="425050" Format="HDF" 
Precision="8">../negative/xdmf/tet_cell2.h5:Data1</DataItem>
          </Topology>
          <Attribute Center="Node" Name="pressure-udf" Type="None">
            <DataItem DataType="Float" Dimensions="30317" Format="HDF" 
Precision="4">../negative/xdmf/tet_cell2.h5:Data2</DataItem>
          </Attribute>
        </Grid>

      </Grid>
    </Grid>

  </Domain>
</Xdmf>

CLASSIFICATION: UNCLASSIFIED
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