OpenCL FDTD electromagnetic simulation in 3 dimensions
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jan 89e305f78e Fix triangular lattice code in pgcgen 5 years ago
fdtd remove __pycache_ stuff 6 years ago
.gitignore gitignore changes 6 years ago Use markdown for license 6 years ago update module name 5 years ago Initial commit 6 years ago Fix triangular lattice code in pgcgen 5 years ago
requirements.txt Initial commit 6 years ago


opencl_fdtd is a python application for running 3D time-domain electromagnetic simulations on parallel compute hardware (mainly GPUs).

Performance highly depends on what hardware you have available:

  • A 395x345x73 cell simulation (~10 million points, 8-cell absorbing boundaries) runs at around 42 iterations/sec. on my Nvidia GTX 580.
  • On my laptop (Nvidia 940M) the same simulation achieves ~8 iterations/sec.
  • An L3 photonic crystal cavity ringdown simulation (1550nm source, 40nm discretization, 8000 steps) takes about 5 minutes on my laptop.

Capabilities are currently pretty minimal:

  • Absorbing boundaries (CPML)
  • Conducting boundaries (PMC)
  • Anisotropic media (eps_xx, eps_yy, eps_zz, mu_xx, ...)
  • Direct access to fields (eg., you can trivially add a soft or hard current source with just sim.E[1] += sin(f0 * t), or save any portion of a field to a file)



  • python 3 (written and tested with 3.5)
  • numpy
  • pyopencl
  • h5py (for file output)
  • gridlock
  • masque

To get the code, just clone this repository:

git clone

You can install the requirements and their dependencies easily with

pip install -r requirements.txt


The root directory contains, which sets up and runs a sample simulation (cavity ringdown).