# vtkOpenFOAMReader: reading OpenFOAM-11 particle data?

**URL:** <https://discourse.vtk.org/t/vtkopenfoamreader-reading-openfoam-11-particle-data/14132>\
**Category:** Development\
**Created:** [June 28, 2024, 7:29am UTC](https://discourse.vtk.org/t/vtkopenfoamreader-reading-openfoam-11-particle-data/14132 "2024-06-28T07:29:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nchowlett](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/n/f14d63/32.png) [@nchowlett](https://discourse.vtk.org/u/nchowlett)\
**Post date:** [June 28, 2024, 7:29am UTC](https://discourse.vtk.org/t/vtkopenfoamreader-reading-openfoam-11-particle-data/14132/1 "2024-06-28T07:29:29Z")

</div>

Heya! I’m having an issues reading lagrangian data using vtkOpenFOAMReader via Python. I can’t even see any lagrangian arrays even tho particle files are present in each time-step directory (see code below). I used OpenFOAM-11 (dev) to output lagrangian data. Thanks in advance for your help!

```auto
import vtk
import pyvista as pv
reader = vtk.vtkOpenFOAMReader() 
reader.SetFileName("./case.foam")
reader.EnableAllPointArrays()
reader.EnableAllLagrangianArrays()
reader.UpdateInformation()
reader.SetTimeValue(1)
reader.Update # SetTimeValue: good
fluidVars = reader.GetNumberOfCellArrays() # most: good (phi: ignored)
particleVars = reader.GetNumberOfLagrangianArrays()
print(particleVars) # shows 0 arrays

```