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KEYWORD: diesel engine; flow structure; large-eddy simulation; mesh density ABSTRACT: By using the software FIRE, the flow structure of 186FA diesel engine were analyzed by numerical simulation. The indicator diagram, velocity field and turbulent kinetic energy in the cylinder were simulated by both the k - e model and the large-eddy simulation(LES) model. The results shows that the mesh density has little effect on the flow structure when the k - e model is adopted. Compared with the k - e model, the LES model shows a significantly different and relatively more complex turbulence structure,and its turbulent kinetic energy is much lower than that of the latter. At the same time, the finer the mesh is, the more distinct the effect is. In this paper, by using the LES turbulence model of the software FIRE, the cylinder pressure, velocity field and turbulent kinetic energy of the internal combustion engine were analyzed, as well as the effect of mesh density on large-eddy simulation of the flow structure in internal combustion engine, and the result was compared with the general k - e model in RANS model.

Effects of mesh density on LES of the flow structure in internal combustion engine