Aerodynamic Characteristics of Ahmed Body with Inverted Airfoil Eppler 423 and Gurney Flap on Fastback Car

Zainal Arifin (Universitas Sebelas Maret, Indonesia)
Suyitno Suyitno (Universitas Sebelas Maret, Indonesia)
Dominicus Danardono Dwi Prija Tjahjana (Universitas Sebelas Maret, Indonesia)
Wibawa Endra Juwana (Universitas Sebelas Maret, Indonesia)
Rendy Adhi Rachmanto (Universitas Sebelas Maret, Indonesia)
Chico Hermanu Brillianto (Universitas Sebelas Maret, Indonesia)
Ubaidillah Ubaidillah (Universitas Sebelas Maret, Indonesia)
Singgih Dwi Prasetyo (Universitas Sebelas Maret, Indonesia)
Arinal Falah Muhammad (Universitas Sebelas Maret, Indonesia)
Mohd Afzanizam Mohd Rosli (Universiti Teknikal Malaysia, Malaysia)

Automotive Experiences
Vol 5 No 3 (2022)

The installation of aerodynamic devices, such as rear wings with the application of a Gurney flap, is very important to improve the performance of vehicles and can generate downforce and reduce slip when a car turns and brakes. The goal of this study was to determine the aerodynamic characteristics of the addition of a rear wing using an Eppler 423 airfoil, which was applied with a Gurney flap featuring variations in the angle of attack and the height of the Gurney flap. The rear wing was mounted on the Ahmed body with a rear slant angle of 15°, which is similar to the configuration on a fastback type car. This research was conducted by 3D modeling through computational fluid dynamics (CFD) simulation using ANSYS Student R18.2 by using ahmed body design. There are three variations in the angle of attack for the rear wing (0°, 7.5°, and 15°), as well as five variations in Gurney flap height of 0%, 0.5%, 1%, 1.5%, and 2% for the chord-line length. In this study, the best variation was found at an angle of attack of 15⁰ with a height of 2% C. From this configuration improved CL/CD ratio by 25.36% when compared to the results without a Gurney flap.