pmesh 0.1.8

Particle Mesh in Python

pmesh: Particle Mesh in Python
=============================

The `pmesh` package lays out the fundation of a parallel
Fourier transform particle mesh solver in Python.

Build Status
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.. image:: https://api.travis-ci.org/rainwoodman/pmesh.svg
:alt: Build Status
:target: https://travis-ci.org/rainwoodman/pmesh/

This readme file is minimal. We shall expand it.

API Reference
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Refer to http://rainwoodman.github.io/pmesh for a full API reference.


Description
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The domain decomposition is 2-d (pencil/stencils). [pmesh.domain]
FFT is supported by pfft-python.
Currently the conversion between particle and mesh we only implement
the linear window function (Cloud-in-Cell). Plans are to implement
other windows, e.g. truncated lanczos or some wavelet motivated windows
that acts as an apodization filter to suppress aliasing effect.

Currently, a particle mesh gravity solver is in utils/gravpm.py .
We have compared that the force output at first time step agrees with
the long range force calculation in MP-Gadget3.

We also provide a simple (long range) gravitational strain calculator in utils/strain.py .
The calculator have been used to calculate the strain tensor for the RunPB dark matter simulations
(2048^3 particles in a 1380 Mpc/h box), on 576 MPI ranks at Edison.

There is a power-spectrum calculator in utils/powerspectrum.py

If there are issues starting up a large size MPI job, consult
http://github.com/rainwoodman/python-mpi-bcast


Yu Feng