Comparison of IC Engine Swirl/Tumble Prediction for Different Mesh Element Types

摘要

Fluent Computational Fluid Dynamics (CFD) software has been successfully used to simulate engine swirl and tumble flow. Two mesh approaches are possible within Fluent software to calculate transient engine swirl and tumble. One approach uses hybrid mesh, while the other approach uses hex/wedge layering. The hybrid method employs tetrahedral (tet) remeshing, and is easier to set up compared to hex/wedge layering. However, the hybrid method raises some concerns about result accuracy due to higher numerical diffusion associated with tet elements compared to the corresponding hex/wedge elements used for layering approach. This paper examines the two mesh approaches in terms of result accuracy for two engines, one diesel and one SI.