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This PR shows how to use 'simple'/standard kernels for particle-particle interaction in v4.

Now that Kernels have access to all particles, it is fairly straightforward to write both the Pull and the Merge kernel in vectorised form (barring the KernelParticle bug in #2143).

This means that we don't need all the machinery for InteractionParticles, so that can all be removed from the codebase

This PR implements #2396

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Looks great!

@erikvansebille erikvansebille merged commit 551cf3a into v4-dev Dec 12, 2025
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@erikvansebille erikvansebille deleted the particle_particle_interaction_v4 branch December 12, 2025 07:35
@github-project-automation github-project-automation bot moved this from Backlog to Done in Parcels development Dec 12, 2025
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3 participants