Skip to main content

GPU-accelerated N-Body particle simulator with visualizer

## Project description

# nBody

### A GPU-accelerated N-body particle simulator and animator

Create complex particle simulations the easy way: a high-level package for designing and simulating large-scale particle interactions. Let nBody do the hard work for you!

## Features

Easy to use – and fast – nBody can simulate:

• Gravitational acceleration
• Coulomb interactions
• Particle collisions

nBody is highly optimized:

Animated [`matplotlib`](https://matplotlib.org/ “Matplotlib”) visualizations included for 2-D simulations. 3-D animations are also supported through the use of [`vpython`](https://vpython.org/ “VPython”).

## Quick-Start

Using `numpy` arrays, you will need:

• An initial position array `x` with shape `(N,p)`
• N is the number of particles
• p is the number of dimensions
• An initial velocity array `v` with shape `(N,p)`
• An array of masses `m```with shape ```(N,)`
• An array of charges `q` with shape `(N,)`
• An array of radii `r` with shape `(N,)`

A possible configuration is as follows:

import numpy as np x = np.random.normal(0, 10, (N,p)) # Positions v = np.random.normal(0, 2, (N,p)) # Velocities m = np.random.normal(8, 1, (N, )) # Masses q = np.random.normal(0, 1E-6, (N, )) # Charges r = np.random.normal(1, 0.1, (N, )) # Radii

m[m < 0] = np.abs(m[m < 0]) m[m == 0] = 1E-3

Next, pass these arrays in the given order to the `spheres` function, so as to create a new instance `S` of class `System` with the above conditions.

from nbody import * S = spheres(x, v, m, q, r)

After selecting a simulation runtime `T` and (optional) time-step `dt`, use the `solve` method to calculate the particles’ trajectories.

S.solve(T, dt)

If the system is 2-D such that `p == 2`, an animation can be created and saved to file; here, the filename `quick_start` is chosen, and will produce a file `animations/quick_start.mp4`.

animate(S, “quick_start”)

If the system is 3-D such that `p == 3`, animations can be created but not saved to file – simply omit the string argument shown above, and no warnings will be raised.

Once the `solve` method has been called, it is also possible to save the `System` instance to file; in this case, the data will be saved to a directory `saved/quick_start`.

save(S, “quick_start”)

## Release history Release notifications | RSS feed

This version 0.0.4 0.0.3 0.0.2 0.0.1

## Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for nbody, version 0.0.4
Filename, size File type Python version Upload date Hashes
Filename, size nbody-0.0.4.tar.gz (18.0 kB) File type Source Python version None Upload date Hashes