Technical Paper
Three-Dimensional Simulation of Diesel Spray Ignition and Flame Lift-Off Using OpenFOAM and KIVA-3V CFD Codes
2008-04-14
2008-01-0961
Three-dimensional simulations of ignition and combustion of a diesel spray were conducted. The primary goal of the work was to compare two different CFD codes: OpenFOAM, an object-oriented C++ based code, and KIVA-3V. The spray is modelled by the Eulerian-Lagrangian approach in both codes, with several common submodels. Some important sub-models implemented include inter alia a Kelvin-Helmholtz/Rayleigh-Taylor (KH/RT) model for spray break-up, an improved spray collision model, and a Partially Stirred Reactor (PaSR) model for turbulence-chemistry interaction. Both CFD codes solve the chemical reaction equations in a fully coupled manner. A cubic-shaped Cartesian mesh was used in the KIVA-3V simulations, while a polyhedral mesh including a combination of hexagonal and prism-shaped cells was constructed for the OpenFOAM computations. The effects of high EGR and ambient temperature on the ignition and flame lift-off processes of a diesel spray were investigated.