Code details

Overview

From a high-level perspective, ChiDG is a library. A ChiDG environment can be imported from the library and used by some driver. For example, the ChiDG executable is just a driver file that links with the ChiDG library and creates a ChiDG-object, which is then used to initialize the framework, read data, and run a simulation.

ChiDG Library

The ChiDG library contains the infrastructure(classes, datatypes, etc.) for representing concepts related to solving partial differential equations on discretizations of space and time. These are things like a computational grid, equation sets, time integrators, etc. The ChiDG library also contains a ChiDG API. This is provided through an object chidg_t. In this way, all of the capability of the ChiDG library can be accessed and driven by creating a chidg object, and using high-level routines that it provides. Things like chidg%read_grid('mygrid.h5') and chidg%set('Nonlinear Solver', 'Quasi-Newton').

Extended topics:

• ChiDG API
• Input/Output
• Finding your way around ChiDG
• Computational Grid
• Equation Sets
• Boundary conditions
• Solvers
• Parallelization
• Automatic Differentiation