Summary
Both external and internal flows of cars were simulated. A third-order upwind-difference scheme was used in these simulations. Computational grids were generated by a multi-block transformation and a trans-finite method. Engine compartments were modeled in grid systems. They had engine blocks, transmissions, air-cleaners, and suspension arms. Heat-exchangers were simulated as pressure losses. In the first case, influences of a license plate and bypass-flows on the cooling airflow were investigated. Simulated results were compared with experimental results using a production car. In another case, cooling airflows of a high-speed research car were studied. Computed results told that the amount of cooling airflow through inter-coolers and oil-cooler were not sufficient in the first design stage. This was also found in the test of an actual car. We concluded that the present method is quite useful to predict air flow rates through heat exchangers built in a new car in the early design stage.
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Himeno, R., Fujitani, K., Satoh, S. (1991). A Study of Aerodynamic Characteristics of Detailed Car Configurations Using a Finite Difference Analysis of Airflows. In: Heller, M.R. (eds) Automotive Simulation ’91. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84586-4_14
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DOI: https://doi.org/10.1007/978-3-642-84586-4_14
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