A study on the shape of artificial cars that affect drag force by numerical method

Name: C. Ratchapol

Organization : Rajamangala University of Technology Isan. Faculty of Engineering and Technology

Name: W. Nuttapong

Organization : Rajamangala University of Technology Isan. Faculty of Engineering and Technology

Name: S. Supattra

Organization : Rajamangala University of Technology Isan. Faculty of Engineering and Technology

Name: T. Pornsawan

Organization : Rajamangala University of Technology Isan. Faculty of Engineering and Technology

Email : pornsawan.to@rmuti.ac.th

keyword: Vehicle design

LCSH: Automobiles -- Aerodynamics

LCSH: Drag (Aerodynamics)

LCSH: Numerical analysis

LCSH: Computational fluid dynamics

Abstract: The goal of the annual Honda Econo Mileage Challenge is to compete under the theme "How far can you travel in 1 liter of gasoline?" to have vocational and university students design and develop artificial cars, which is based on the original engine of a family motorcycle. that every student can have fun inventing, testing, and experimenting with engine and car shapes while being environmentally friendly. There is a lot of possibility to design the shape of artificial cars by implementing aerodynamic features on the car shape to improve energy efficiency. This study investigates the aerodynamics of the artificial car. The drag coefficient is examined by using Computational Fluid Dynamics (CFD). The commercial software, FLUENT, is employed in a three-dimensional model. The low-speed wind tunnel was used to test the artificial car models at a velocity between 10-40 km/hr. The results were then validated with CFD simulation. The study began with a simulation of airflow around a conventional model car, followed by an analysis of the results to improve the aerodynamic designs of three subsequent car-shaped models. The designs of their frontal shapes differ, specifically featuring distinct forms: a general curved model, an oval model, and a circular model, respectively. The CFD results reveal that the ellipsoidal model attains the lowest drag force and drag coefficient levels. Its streamlined characteristics contribute to reduced aerodynamic resistance during motion. To validate the accuracy of the simulation results, wind tunnel experiments were performed on scale models of the vehicles. A 1/28-scale model of the vehicles was constructed for this purpose. The aim of these experiments was to measure drag force and drag coefficients, enabling a comparison with the simulated data to verify the reliability of the simulations

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2025-08-18

Issued: 2025-08-18

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BibliograpyCitation : In Thai Society of Mechanical Engineers (TSME) and Kasetsart University (KU). The 14th TSME International Conference on Mechanical Engineering (TSME-ICoME14 2024) (CST0013). Chonburi : Kasetsart University Sriracha Campus, 2024

eng

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