# Implementing Catalyst in the OVERFLOW solver

**URL:** https://discourse.paraview.org/t/implementing-catalyst-in-the-overflow-solver/17673
**Category:** In Situ Support
**Created:** [August 4, 2026, 3:47pm UTC](https://discourse.paraview.org/t/implementing-catalyst-in-the-overflow-solver/17673 "2026-08-04T15:47:18Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Darby\_Vicker](https://discourse.paraview.org/user_avatar/discourse.paraview.org/darby_vicker/32/17791_2.png) [@Darby\_Vicker](https://discourse.paraview.org/u/Darby_Vicker)
#### Post date: [August 4, 2026, 3:47pm UTC](https://discourse.paraview.org/t/implementing-catalyst-in-the-overflow-solver/17673/1 "2026-08-04T15:47:18Z")

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Hello,

I’m interested in implementing catalyst in the OVERFLOW solver. If anyone has pointers for implementing this in a structured solver written in FORTRAN, please let me know.

To get started, I’m working my way through the [getting started guide](https://docs.paraview.org/en/latest/Catalyst/getting_started.html). I wanted to report that the [example Cxx program](https://gitlab.kitware.com/paraview/paraview/-/tree/master/Examples/Catalyst2/CxxFullExample) in the source (linked at the top of that page) seems to have disappeared. I’ve grabbed that from a previous tag in the repo but I just wanted to report that its gone missing.

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 6, 2026, 11:43am UTC](https://discourse.paraview.org/t/implementing-catalyst-in-the-overflow-solver/17673/2 "2026-08-06T11:43:56Z")

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@Louis_Gombert

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### Author: ![Louis\_Gombert](https://discourse.paraview.org/user_avatar/discourse.paraview.org/louis_gombert/32/14576_2.png) [@Louis\_Gombert](https://discourse.paraview.org/u/Louis_Gombert)
#### Post date: [August 6, 2026, 12:55pm UTC](https://discourse.paraview.org/t/implementing-catalyst-in-the-overflow-solver/17673/3 "2026-08-06T12:55:16Z")

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Hello, the Catalyst2 examples have been moved to an external repository: [https://gitlab.kitware.com/paraview/catalyst-examples/-/tree/master/ParaView/CxxUnstructuredGrid](https://gitlab.kitware.com/paraview/catalyst-examples/-/tree/master/ParaView/CxxUnstructuredGrid)

I will update the docs, thank you for reporting the error.