Hi everyone!
I’d like to share an open source project called Mavi for particle dynamics simulations I’ve been working on.
Github Repository: GitHub - marcos1561/Mavi.jl: Mavi is a Particle Dynamics Engine.
The project is still in early development, so suggestions and new contributors are very welcome!
About the project
The goal of the project is to provide a flexible implementation for studying systems of interacting particles that can be customized to the user’s needs.
Main features
- Support for different equations of motion (Newton’s seconds law, Langevin equations, custom-defined)
- Common interaction potentials (Lennard-Jones, custom-defined)
- Support for simulations with varying particle numbers.
- Obstacles with general geometries constructed from line segments or with specialized shapes, such as circles. Obstacles can also have different behaviors upon collisions with particles – exerting forces or solving collisions in special ways, such as reflecting the velocity.
- A system to run virtual experiments and collect data. Users can run experiments with custom collectors to gather only relevant data. Long experiments can periodically create checkpoints that can be used to load and continue an experiment.
- Tools for visualization (using Makie):
- Real-time interactive animation, with the possibility of adding custom visual elements.
- Image generation.
- Video generation.
To demonstrate the extensibility of the Mavi core module, there is a Mavi.Rings submodule that implements a model for biological cells using active rings, as presented in this article: Teixeira, Emanuel F., Carine P. Beatrici, Heitor C. M. Fernandes, and Leonardo G. Brunnet. “Segregation in Binary Mixture with Differential Contraction among Active Rings.” Physical Review Letters 134, no. 13 (2025): 138401
Example
Example of creating particles at the vertices of a rectangular grid, interacting via a harmonic truncated potential (with Newtonian dynamics), embedded in a rectangle space with rigid walls. We also animate the system in real time, drawing the particles with physically meaningful radii and coloring them with the magma colormap.
using Mavi
using Mavi.States
using Mavi.InitStates
using Mavi.Configs
using Mavi.Visualization
function main()
num_p_x = 10
num_p_y = 10
offset = 0.4
num_p = num_p_x * num_p_y
dynamic_cfg = HarmTruncCfg(ko=10, ro=1, ra=1)
radius = particle_radius(dynamic_cfg)
pos, geometry_cfg = rectangular_grid(num_p_x, num_p_y, offset, radius)
state = SecondLawState(
pos=pos,
vel=random_vel(num_p),
)
space_cfg = SpaceCfg(
wall_type=RigidWalls(),
geometry_cfg=geometry_cfg,
)
system = System(
state=state,
space_cfg=space_cfg,
dynamic_cfg=dynamic_cfg,
int_cfg=IntCfg(dt=0.01),
)
anim_cfg = AnimationCfg(
graph_cfg=CircleGraphCfg(colors_map=:magma),
)
animate(system, anim_cfg)
end
