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International Journal of Automotive Technology > Volume 7(4); 2006 > Article
International Journal of Automotive Technology 2006;7(4): 415-422.
LARGE EDDY SIMULATIONS OF TUMBLE AND SWIRL FORMATIONS IN ENGINE IN-CYLINDER FLOW
B. S. LEE, J. S. LEE
Seoul National University
ABSTRACT
Swirl and tumble flows in an engine in-cylinder have been simulated by using a three-dimensional computational fluid dynamics code, and the results are validated in comparison with experimental data. The large eddy simulation based on the Smagorinsky model and the fractional step method is adopted to describe the turbulence of incylinder flows and to save computing time, respectively. The main purpose of this study is connected with the effect of various conditions of intake flows on formation and development of in-cylinder tumble and swirl motions. The engine speeds considered are 1000 rpm and 3000 rpm for intake flows with inclination angles between –10° and 20° at deflection angles of 0°, 22.5°, and 30°. The results are discussed by visualizing flow fields and by evaluating parameters in relation to vortex intensity such as swirl and tumble ratios.
Key Words: Large eddy simulation, Tumble and swirl motions, Inclination and deflection angles of intake flow
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