Скачать или смотреть Reacting charged particles under gravity, with more particles, 20%-80% charge proportion

Like the video    • Reacting charged particles under gravity 2...   , this one shows a simulation of charged particles subject to a Coulomb interaction, a gravity force pointing downwards, and a viscous friction. There are more particles as in the previous video, and the proportion of signs is different: only 20% of particles are negatively charged, while 80% are positively charged. As a result, more positively charged particles remain at the end, which repel each other.
For particles of opposite charge, the Coulomb interaction is complemented by a Lennard-Jones interaction, preventing the particles from collapsing on a single point. When a positively and a negatively charged particle stay close to each other long enough, they react to become a neutral diatomic molecule.
The particles' color depends on their charge.
To save on computation time, particles are placed into a "hash grid", each cell of which contains between 3 and 10 particles. Then only the influence of other particles in the same or neighboring cells is taken into account for each particle.

Render time: 24 minutes 29 seconds
Compression: crf 23
Color scheme: Twilight by Bastian Bechtold
https://github.com/bastibe/twilight

Music: "Calle Calor" by Quincas Moreira‪@QuincasMoreira‬

Current version of the C code used to make these animations:
https://github.com/nilsberglund-orlea...
https://www.idpoisson.fr/berglund/sof...
Some outreach articles on mathematics:
https://images.math.cnrs.fr/auteurs/n...
(in French, some with a Spanish translation)

#ions #particles #chemical_reactions