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Aerodynamic Development of 2014 Model Year FIT

Article of Honda R&D Technical Review Vol.26 No.1

Summary

Aerodynamic development of the 2014 model year FIT achieved an approximately 7% reduction in aerodynamic drag compared to the 2008 model, giving it among the world’s lowest drag coefficients in the hatchback category. Based on wind tunnel testing and simulation results, a vehicle body with high aerodynamic performance was realized. The Hondacreated CFD system was used for the exterior design development, helping to optimize aerodynamic shape while supplementing scale-model testing. For the platform development, CFD analysis of the flow field established a direction for enhancing aerodynamic performance and helped optimize the shape in detail. From this process, it was confirmed that to inhibit total pressure loss in the vehicle wake, it is important to ensure uniform flow velocity and pressure distribution in the vehicle front (including the engine room) and rear end.

Reference

(1) Yamasaki, H., Toki, Y., Murayama, T.: Aerodynamic Technologies Adopted in the Third Generation Prius, Toyota Technical Review, Vol. 57, No. 1, p. 20-26 (2010) (in Japanese)
(2) Ohira, H., Okamoto, S., Nakato, H., Kaya, M., Uematsu, T., Matsuoka, H.: Aerodynamic Development of All-New Mazda Atenza, Mazda Technical Review, No. 26, p. 65-70 (2008) (in Japanese)
(3) Takiguchi, T., Ogawa, K., Tateyama, H., Oda, T: The Automatic Aerodynamic CFD Framework Employing Vehicle Specifications at the Concept Stage of Development, SAE Technical Paper 2013-01-0604 (2013)
(4) Kitajima, Y., Murakawa, A.: 2014 Model Year FIT Design Based on New Honda Design Concept, Honda R&D Technical Review, Vol.26, No.1, p. 1-10
(5) Hucho, W., Sovran, G.: Aerodynamics of Road Vehicles, Annual Review of Fluid Mechanics, Vol. 25, p. 485-537 (1993)

Author (organization or company)

Kentaro MACHIDA(Automobile R&D Center)、Munetsugu KANEKO(Automobile R&D Center)、Terumasa KOTADA(Automobile R&D Center)、Atsushi MURAKAWA(Automobile R&D Center)、Atsushi OGAWA(Automobile R&D Center)

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