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Another question on tracking free-surface!

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Old   September 20, 2022, 10:22
Default Another question on tracking free-surface!
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Callum Guy
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Hi Foamers,

I'm looking for some help to obtain the z-position of the water-air interface at a constant (x, y) position.

I have been using interFOAM to simulate regular surface waves in a water-air multiphase simulation. I have 2D plane vtks saved from my simulation (see attached) and want to probe the centre location in paraview and plot the free surface height with time.

I've tried using a contour filter at alpha=0.5, but I then can't seem to pull a z-position value at a given streamwise location.

Any help would be appreciated.

Cheers,
Callum
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Old   September 26, 2022, 09:31
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Callum Guy
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For the benefit of others, I wanted to share one solution to this issue in ParaView I found. I start with a 2D plane vtp.series file.

The filters I then applied are:

1) Contour for alpha at 0.5

2) I then use the "slice" filter on the Contour at the streamwise position I wish to evaluate wave height at.

3) To make easier viewing, I then run a "calculator" filter on the Contour and select coordsZ from the Scalar drop down menu. This will colour the Contour by wave height.

4) Equally, in a side plane, you can take a spreadsheet view and view the "slice" coordinates - Z coordinate indicating the wave elevation.

5) Finally, you could then use the "plot over time" filter on the slice to get the data through time, this filter can take a LONG time to process.

I've attached a zip file with the ParaView state I used, if anyone has any questions/suggestions feel free to post below, and I'll keep an eye on it in the future!

All the best,
Callum
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Last edited by CallumG; September 26, 2022 at 09:34. Reason: Adding image
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