Abstract
A Computational Fluid Dynamics (CFD) program for in-cylinder airflow analysis has been developed by the authors. The feature of the developed program is that it treats turbulence flow with the quasi-direct numerical simulation (Quasi-DNS). So it is possible to present transient turbulence eddy motions in detail. For fast and high quality mesh generation, the Voxel method was employed. The computational domain is discretized by uniform cubic cells in this method. The simulation results were verified by two benchmark tests. One of them in common use is a backward step flow test, the other is an in-cylinder flow test that supposed the engine induction stroke. Good agreement was obtained between the simulation and the experimental results of these benchmark tests.
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