Dear Mahmoud,

I assume that you use the `Dumux::VtkOutputModule` for vtk output. In this case, you can register secondary variables (in this case viscosity) in the following way:

Dumux::VtkOutputModule<...> vtkWriter(...);

vtkWriter.addVolumeVariable([] (const auto& v) { return v.viscosity(); }, "viscosity (Pa s)");

Cheers,
Dennis


On 10.05.21 03:50, Mahmoud Atef Mahmoud Mohamed Aboelseoud S277151 wrote:
Hello Dumux team,



I'm using the OnePNI model along with the CCMPFA discretization scheme and I want to export the water viscosity to my output like pressure and temperature so that I can view its distribution at the different time steps on Paraview. Could you please show me how to do this? Thanks in advance!



Best Regards,

Mahmoud
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