Stretched Equal Area Generator
A python implementation of the stretched equal area (SEA) algorithm for generating spherically symmetric arrangements of particles with accurate particle densities, e.g. for SPH initial conditions that precisely match an arbitrary density profile, as presented in Kegerreis et al. (2019), MNRAS 487:4, 5029-5040, https://doi.org/10.1093/mnras/stz1606.
See also https://github.com/srbonilla/WoMa for making the initial profiles, placing particles with SEAGen, and modifications for spinning bodies.
Jacob Kegerreis (2020) firstname.lastname@example.org
Visit https://github.com/jkeger/seagen to download the code including examples and for support.
This program has been tested for a wide range of cases but not exhaustively. If you find any bugs, potential improvements, or features worth adding, then please let us know!
seagen.pyThe main program classes and functions.
examples.pyExamples to demonstrate how to use the SEAGen module.
MANIFEST.inPython package files.
LICENSE.txtGNU general public license v3+.
- See the doc strings in
seagen.pyfor all the details.
- Create a single shell of particles and print their positions:
import seagen N = 100 r = 1 particles = seagen.GenShell(N, r) print(particles.x, particles.y, particles.z)
- Create a full sphere of particles on a simple density profile and print their
positions and masses:
import seagen import numpy as np N = 100000 radii = np.arange(0.01, 10, 0.01) densities = np.ones(len(radii)) # e.g. constant density particles = seagen.GenSphere(N, radii, densities) print(particles.x, particles.y, particles.z, particles.m)
examples.pyfor other working examples, e.g. an arbitrary density profile with multiple layers and extra temperature information.
PyPI: Automatically install the package with
pip install seagen, see https://pypi.org/project/seagen/
- Direct download: The single
seagen.pyfile can be imported and used without any extra installation, so you can just download this repository and place the file in a local directory or wherever your python will look for modules.
- Python 3 (tested with 3.6.0).
- PEP8 is followed in most cases apart from some indentation alignment.
- Arrays are explicitly labelled with a prefix
- Particle is abbreviated to
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