EMC(Enhanced Momentum Coupling) 기법을 이용한 디젤 엔진 시뮬레이션의 수치 해석격자 의존성 저감에 관한 연구

초록

This paper describes the grid-size dependency in diesel engine simulation. Previous studies have shown that traditional CFD codes is sensitive to grid resolution. For this reason, calculated spray results such as spray tip penetration, combustion characteristics are also depend on the grid-size. To reduce these problems, this paper suggests EMC(Enhanced Momentum Coupling) model which enhances the coupling between droplet and gaseous phase. The calculation processes were performed by the KIVA-3V codes and there are two types of computational meshes such as coarse mesh and dense mesh were adopted to verify the grid independency performance on EMC model. In addition, calculated results were compared to experimental results. The calculation results of conventional Eulerian-Langrangian model showed the calculated results highly depend on the grid-size. The main source of this problem was regarded as a result from ineffective momentum coupling between two phases. However, improved EMC model significantly reduced this problem by compensate the insufficient quantity of momentum transfer to the coarse mesh.

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