Abstract
In recent years, computational fluid dynamics has been successfully established for three dimensional simulation of fluid flow, mixture formation, combustion and pollutant formation in direct injection diesel engines. The contribution of the simulation to design analysis and system optimization is strongly determined by the accuracy of the simulation results and overall project turn-around times. Well tested and validated models adopted for simulation of injector flow, spray propagation, combustion and pollutant formation as well as workflow integration, application specific user interfaces, sophisticated pre- and post-processing capabilities are nowadays considered of being mandatory for the application of CFD within the engine development process. On the basis of selected applications, the present article describes the CFD workflow for simulation of injector flow, spray propagation, combustion, and pollutant formation in DI diesel engines. Model validation is achieved via comparison of the simulated results with measured data obtained in an AVL DI diesel engine. All simulation results have been obtained using the commercial CFD code FIRE