Creating a new setup

Going beyond the test problems supplied requires a bit of coding. It is instructive to look at places in the code that depend on the ProblemDefinition specifying which test is being run. For example, in the Astrix directory enter:

grep -r PROBLEM_CYL src/astrix/*

to see a list of places where code specific to the test problem of the flow around a cylinder is executed. These will appear as part of the Mesh class, setting up the initial mesh with the inner hole, as well as in the Simulation class, most notably to set initial and boundary conditions. Additional setups can be added by adding an entry to the ProblemDefinition enum in definitions.h, and create specific mesh generation instructions, initial and boundary conditions for this new setup.