# "Plot Global Variables Over Time" and vtu-series

**URL:** https://discourse.paraview.org/t/plot-global-variables-over-time-and-vtu-series/7080
**Category:** ParaView Support
**Created:** [April 27, 2021, 12:04pm UTC](https://discourse.paraview.org/t/plot-global-variables-over-time-and-vtu-series/7080 "2021-04-27T12:04:49Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Petr\_Melnikov](https://discourse.paraview.org/user_avatar/discourse.paraview.org/petr_melnikov/32/5789_2.png) [@Petr\_Melnikov](https://discourse.paraview.org/u/Petr_Melnikov)
#### Post date: [April 27, 2021, 12:04pm UTC](https://discourse.paraview.org/t/plot-global-variables-over-time-and-vtu-series/7080/1 "2021-04-27T12:04:49Z")

</div>

Hi Guys,

I have a pvd-file with a series of vtu-s. Each vtu contains a single value of the global variable “Kinetic energy” (for example) for the corresponding timestep from pvd:

```
<?xml version="1.0"?>
<VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian" header_type="UInt32" compressor="vtkZLibDataCompressor">
  <UnstructuredGrid>
    <FieldData>
      …
      <DataArray type="Float64" Name="Kinetic energy" NumberOfTuples="1" format="appended" RangeMin="0" RangeMax="0" offset="40"/>
      …  
    </FieldData>
    …
  </UnstructuredGrid>
  …
</VTKFile>

```

I want to plot this variable over time. I decided to use “Plot Global Variables Over Time” for this, but the given filter does not work with my data as it does with the can.ex2 file from Paraview examples.

What am I doing wrong?

Best regards, Petr