These may be slow when used as boundary conditions, but produces results consistent with the special "vortex" type for the example.
Multigrid
The input is json5 files, superset of json, but supports comments and trailing commas. Examples of configuration files can be found under examples, and most combinations of options are found running the output_configuration test:
cargo test output_configuration -- --nocapture
Output is on the hdf5 format, using a group-based system for storing the solution. Use eulerplot to plot the solution.