In the last decade 3D-CFD has been successfully established for three-dimensional simulations of fluid flow, mixture formation, combustion and pollutant formation in internal combustion engines. In direct injected engines, the accuracy of simulation results and hence their contribution to design analysis and optimization strongly depends on the predictive capabilities of the models adopted for simulation of the injector flow, spray formation and propagation characteristics. The original KIVA-3V code uses the droplet collision algorithm of O’Rouke for calculating collisions in Lagrangian spray simulation. The modified KIVA-3V code includes no-time-counter (NTC) method which is proposed by David P. Schmidt (2000). The NTC method of calculating spray droplet collisions is both faster and more accurate than the current standard method of O’Rouke. In this work an original and a modified version of KIVA-3V multi-dimensional CFD code is used to simulate the spray resulting from the injection of diesel fuel. Numerical results from original and modified KIVA-3V are compared to experimental data and also results obtained from Fire code.

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