Massively-parallelized reciprocal monte-carlo ray tracing for radiative transfer coupled with turbulent LES combustion simulations

摘要

Radiation is the dominant mode of heat transfer in high temperature combustion environments. Radiative heat transfer affects the gas and particle phases, including all the associated combustion chemistry. The radiative properties are in turn affected by the turbulent flow field. This bi-directional coupling of radiation turbulence interactions poses a major challenge in creating parallel-capable, high-fidelity combustion simulations. In this work, a new model is developed in which a reciprocal monte-carlo radiation model is coupled with a turbulent large eddy simulation combustion model. An asynchronous, multi-level mesh is implemented. The combustion model runs in parallel on the fine level of a decomposed domain. The radiation model runs asynchronously in parallel on the coarse level of a recomposed domain. The recomposed domain is stored on each processor after information sharing of the decomposed domain is handled via the message-passing interface. A strong scaling analysis was performed on the Titan supercomputer cluster. The model demonstrates strong scaling to over 16,000 processing cores.