Optimization and parallelization of the discrete ordinate method for radiation transport simulation in OpenFOAM: Hierarchical combination of shared and distributed memory approaches

This paper describes the reduction in memory and computational time for simulation of complex radiation transport problems with discrete ordinate method (DOM) model open-source fluid dynamics platform OpenFOAM. Finite volume models require storage vector variables each spatial cell; DOM introduces two additional discretizations, direction wavelength, making a limiting factor. Using specific classes sources data, changing store fluxes other minor changes allowed 75% requirements. Besides, hierarchical parallelization was developed, where node standard uses several computing threads, allowing higher speed scalability problem. This architecture, combined optimization some parts code, global speedup x15. relevant opens new horizon applications previously unaffordable.