This repository presents an implementation of the PFHub Spinodal Decomposition Benchmark using DOLFINx, the experimental version of FEniCS. The basic code for this implementation is lifted from the Cahn-Hilliard example provided by the DOLFINx Docs.

N.B.: DOLFINx does not currently support resuming a simulation from the XDMF/HDF5 checkpoint files it writes. This is a severe deficiency.

I use Singularity to run the nightly DOLFINx build from [DockerHub] (https://hub.docker.com/r/dolfinx/dolfinx/tags?page=1&ordering=last_updated) inside a Conda environment. The Makefile reflects this environment.

• Install Miniconda and Mamba (better dependency resolver)

  $ curl -O https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh
  $ chmod +x Miniconda3-latest-Linux-x86_64.sh
  $ ./Miniconda3-latest-Linux-x86_64.sh
  «agree to EULA, specify install dir, and prepare your shell»
  $ conda install mamba -n base -c conda-forge

• Create and activate an environment containing Singularity

  $ mamba create -n sing python=3 singularity
  $ conda activate sing

• Move to the benchmark directory and run the benchmark

  $ cd ~/path/to/dolfinx-bm1-spinodal
  $ make

DOLFINx MPC provides for periodic boundary conditions. At present, stock DOLFINx does not.