A comprehensive finite element model of composting

Mathematical models of composting represent biological, chemical, and physical processes using a set of partial differential equations. Many compost models have been developed, but none have represented all of the important processes of composting with high spatial resolution. An adaptable, user-friendly model was developed using commercial multi-physics software (COMSOL™) which provided both standard and customizable equations to represent all of the main features of composting, as described in the literature. This software also provided proven solvers for the system of differential equations and finite element methods that enabled finer spatial resolution than previous models. Simulations using the model demonstrated temporal patterns that were qualitatively consistent with those described in the scientific literature, as well as interesting spatial patterns. The model will be a useful tool for future research, the next steps being to parameterize and validate it quantitatively against a physical composting system. *grant.clark@mcgill.ca