[General] Generating vtu and pvtu files

tylergug · October 14, 2013, 12:36

Hello,

I am new to this forum and paraview as well. I have some large vtk files that need to be processed, and to process them in parallel I believe that I would need to split them up into multiple vtu files. Then have a pvtu file combine them into a single object. However, I do not know how to split these vtk files into vtu and so on. Does anyone have any experience in this? Any help and information would be greatly appreciated.

Thanks in advance,
Tyler

tylergug · October 16, 2013, 11:28

Anybody? I haven't been able to find much information on the web about this

whumber · October 17, 2013, 12:02

Easiest way would probably to just partition them with something like metis or scotch and then convert each partition to its own .vtu file.

yosuke1984 · March 11, 2014, 13:03

This is my pvtu and tria vtu samples.

Basically, a pvtu file is a parent. It calls material1.vtu and material2.vtu files.
If you read the pvtu file, paraview automatically read all the sub domain vtu files.

From your problem size, I believe your problem is domain decomposed. If not use graph partitioners like metis, scotch or chaco. Then it is easy to created each vtu files. Just assign each domain mesh and variables for a vtu files.

Then modify followings according to the number of domains.

Code:

<Piece Source="material1.vtu"/> 
<Piece Source="material2.vtu"/>
.
.
. 
<Piece Source="materialN.vtu"/>

------------------------------------------------------------------------------------------------------------------------------
parallel.pvtu
------------------------------------------------------------------------------------------------------------------------------

Code:

<?xml version="1.0"?> 

<VTKFile type="PUnstructuredGrid" version="0.1" byte_order="LittleEndian"> 
<PUnstructuredGrid GhostLevel="0"> 
<PPoints> 
  <PDataArray type="Float32" Name="Position" NumberOfComponents="3"/> 
</PPoints> 
<PCells> 
  <PDataArray type="Int32" Name="connectivity" NumberOfComponents="1"/> 
  <PDataArray type="Int32" Name="offsets"      NumberOfComponents="1"/> 
  <PDataArray type="UInt8" Name="types"        NumberOfComponents="1"/> 
</PCells> 
<PCellData Scalars="Material"> 
    <PDataArray type="Int32" Name="Material" NumberOfComponents="1"/>    
</PCellData> 
<Piece Source="material1.vtu"/> 
<Piece Source="material2.vtu"/> 
</PUnstructuredGrid> 
</VTKFile>

------------------------------------------------------------------------------------------------------------------------------
material1.vtu
------------------------------------------------------------------------------------------------------------------------------

Code:

<?xml version="1.0"?> 

<VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian"> 
<UnstructuredGrid> 
<Piece NumberOfPoints="3" NumberOfCells="1"> 
<Points> 
  <DataArray type="Float32" Name="Position" NumberOfComponents="3" format="ascii"> 
    0.0    0.0    0.0 
    1.0    1.0    0.0 
    0.0    1.0    0.0 
  </DataArray> 
</Points> 
<Cells> 
  <DataArray type="Int32" Name="connectivity" NumberOfComponents="1" format="ascii"> 
    0    1    2        
  </DataArray> 
  <DataArray type="Int32" Name="offsets" NumberOfComponents="1" format="ascii"> 
    3    
  </DataArray> 
  <DataArray type="UInt8"  Name="types" NumberOfComponents="1" format="ascii"> 
    5 
  </DataArray> 
</Cells> 
<CellData Scalars="Material"> 
  <DataArray type="Int32" Name="Material" NumberOfComponents="1" format="ascii"> 
    1    
  </DataArray> 
</CellData> 
</Piece> 
</UnstructuredGrid> 
</VTKFile>

------------------------------------------------------------------------------------------------------------------------------
material2.vtu
------------------------------------------------------------------------------------------------------------------------------

Code:

<?xml version="1.0"?> 

<VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian"> 
<UnstructuredGrid> 
<Piece NumberOfPoints="3" NumberOfCells="1"> 
<Points> 
  <DataArray type="Float32" Name="Position" NumberOfComponents="3" format="ascii"> 
    0.0    0    0 
    1.0    0.0    0 
    1.0    1.0    0 
  </DataArray> 
</Points> 
<Cells> 
  <DataArray type="Int32" Name="connectivity" NumberOfComponents="1" format="ascii"> 
    0    1    2    
  </DataArray> 
  <DataArray type="Int32" Name="offsets" NumberOfComponents="1" format="ascii"> 
    3 
  </DataArray> 
  <DataArray type="UInt8"  Name="types" NumberOfComponents="1" format="ascii"> 
    5 
  </DataArray> 
</Cells> 
<CellData Scalars="Material"> 
  <DataArray type="Int32" Name="Material" NumberOfComponents="1" format="ascii"> 
    2    
  </DataArray> 
</CellData> 
</Piece> 
</UnstructuredGrid> 
</VTKFile>

October 14, 2013, 12:36	Generating vtu and pvtu files	#1
tylergug New Member Join Date: Oct 2013 Posts: 3 Rep Power: 12	Hello, I am new to this forum and paraview as well. I have some large vtk files that need to be processed, and to process them in parallel I believe that I would need to split them up into multiple vtu files. Then have a pvtu file combine them into a single object. However, I do not know how to split these vtk files into vtu and so on. Does anyone have any experience in this? Any help and information would be greatly appreciated. Thanks in advance, Tyler

October 16, 2013, 11:28		#2
tylergug New Member Join Date: Oct 2013 Posts: 3 Rep Power: 12	Anybody? I haven't been able to find much information on the web about this

October 17, 2013, 12:02		#3
whumber New Member William Humber Join Date: Nov 2009 Posts: 11 Rep Power: 16	Easiest way would probably to just partition them with something like metis or scotch and then convert each partition to its own .vtu file.