The present paper is intended to report LES approach of non-evaporative and evaporative diesel sprays in order to describe the heterogeneous structure in the diesel spray. The computational code used in LES approach is KIVALES in which LES is incorporated into conventional KIVA code. In KIVALES, κ-Δ model and gradient diffusion model are employed for the SGS stress model and SGS scalar model, respectively. The atomization is modeled by using modified TAB model, and the calculation method of convective terms for capturing the turbulent vortices uses the Interpolated Donor Cell differencing scheme. Using LES approach, the three-dimensional turbulent vortices can be captured, and the calculation of intermittency at outer edge of the spray in the non-evaporative and evaporative diesel sprays is also derived. Furthermore, good agreements of spray characteristics, such as spray tip penetration, Sauter mean diameter and liquid length, are obtained between LES results and experimental results.
