Coupling of 3D Eulerian and Lagrangian Spray Approaches in Industrial Combustion Engine Simulations

摘要: The Lagrangian DDM (discrete droplet model) is state-of-the-art for CFD (computational fluid dynamics) simulations of mixture formation and combustion in industrial engines. A commonly known drawback the approach attenuated validity dense spray, where bulk liquid disintegrates into droplets. There assumption single droplets surrounded by a homogenous gas field not reasonable. In this region, Eulerian-Eulerian multi-phase performs better because instead parcels spray represented volume fractions one several size class phases. further that increasing spatial resolution computational grid leads to reduced statistical convergence, since number per cell becomes smaller. It desirable combine benefits both approaches coupled simulations. Therefore, region simulated separately with Eulerian on highly resolved mesh covering only close nozzle orifice. entire engine domain emission models Eulerian-Lagrangian dilute region. two are through exchange boundary conditions model source terms. An on-line coupling interface manages data transfer between simulation clients, i.e., client. aim work extend terms exchanging related heat species sources, consequently creating link models. results show real-case simulations, demonstrate feasibility combination engineering applications.