Tracking high-velocity material in ALE simulation (LS-DYNA)

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abdelatif CHERAITIA

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Mar 26, 2026, 9:08:18 AM (13 days ago) Mar 26

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Hello,
I am running a 2D axisymmetric ALE multi-material simulation in LS-DYNA.

In d3plot, I can see parts like:

air
disc
explosive
airfluid(ale)


discfluid(ale)


explosivefluid(ale)

I want to extract and track (velocity and position of noeuds) the whole material region the metallic material " disc " after it turned into something resembling lava.

Since this is an ALE model, I cannot directly track material nodes like in a Lagrangian simulation.

What is the best way to:

isolate this region,
export its useful data from LS-PrePost,
or prepare the model in the keyword file so that post-processing becomes easier?

My goal is to later process the results in MATLAB and make it automatically for different geometry so I can't select it by id noeuds because it will be different from geometry to another one .
Any recommended workflow?

l...@schwer.net

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Mar 26, 2026, 9:18:23 AM (13 days ago) Mar 26

to abdelatif CHERAITIA, ls-d...@googlegroups.com

To track particle motion in an ALE material typically one uses *Database_Tracer with the output frequency controlled by *Database_TRHIST. The resulting ASCII file (TRHIST) could be postprocess via an algorithm (MATLAB). --len

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