# Handle time series of PartitionedDataSetCollection ?

**URL:** <https://discourse.vtk.org/t/handle-time-series-of-partitioneddatasetcollection/12089>\
**Category:** Development\
**Tags:** file-formats\
**Created:** [August 3, 2023, 9:31am UTC](https://discourse.vtk.org/t/handle-time-series-of-partitioneddatasetcollection/12089 "2023-08-03T09:31:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![untereiner](https://discourse.vtk.org/user_avatar/discourse.vtk.org/untereiner/32/7561_2.png) [@untereiner](https://discourse.vtk.org/u/untereiner)\
**Post date:** [August 3, 2023, 9:31am UTC](https://discourse.vtk.org/t/handle-time-series-of-partitioneddatasetcollection/12089/1 "2023-08-03T09:31:17Z")

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Hi,

I have simulation results that have the structure below (simplified):  
PVD file (list of .vtm files):

- time step 0 : 0.vtm
  - VTM file (list of vtu files):  
- block0/subblock0/rank0.vtu  
- block0/subblock0/rank1.vtu  
- block0/subblock1/rank0.vtu  
- block0/subblock1/rank1.vtu

I wanted to use the new vtkPartitionedDataSetCollection. I understand well that I can modelize the bloc/sublock hierarchy with vtkAssembly and put all in the collection.  
But how can I didn’t manage to list all the vtpc files in a pvd file to handle the timesteps. Is it even possible ? Is there an another way to do that ?

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<div class="post-metadata">

**Author:** ![untereiner](https://discourse.vtk.org/user_avatar/discourse.vtk.org/untereiner/32/7561_2.png) [@untereiner](https://discourse.vtk.org/u/untereiner)\
**Post date:** [August 30, 2023, 8:13am UTC](https://discourse.vtk.org/t/handle-time-series-of-partitioneddatasetcollection/12089/2 "2023-08-30T08:13:39Z")

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I investigated a bit. Using the filter that transforms a vtkBlockDataSet to a vtkPartionedDataSetCollection I will have one vtpc file per timestep. Would it be possible to have a vtm file that groups these vtpc files ?