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Journal : Automotive Experiences

Aerodynamic Approach to Two-Passenger City Car Design: A Study of Square Back and Compact Shapes Putra, Randi Purnama; Yuvenda, Dori; Lapisa, Remon; Afnison, Wanda; Milana, Milana; Setiawan, M. Yasep; Arif, Ahmad; Harmanto, Dani
Automotive Experiences Vol 8 No 2 (2025)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.13686

Abstract

The development of lightweight electric cars for urban mobility requires efficient aerodynamic design without sacrificing space efficiency. This study presents a novel method by investigating the combination of a two-seater city car's compact dimensions and square back shape, which has not been extensively researched for low- to medium-velocity vehicles. This study's objective is to assess the design's aerodynamic performance using numerical simulations using the Computational Fluid Dynamics (CFD) approach. The vehicle model is designed with a compact body and square back, which is commonly used in small vehicles with high maneuverability requirements. The simulations are conducted at three different air velocity levels: 10, 20, and 30 m/s. The results of the study showed an increase in the value of the drag coefficient (Cd) along with an increase in flow velocity. At a velocity of 10 m/s, the Cd value was recorded at 0.4536. When the velocity increased to 20 m/s, the drag coefficient increased slightly to 0.4563. Further increases in velocity to 30 m/s resulted in a Cd value of 0.4581. This Cd value shows the consistency of aerodynamic performance with increasing velocity, with fluctuations that remain within the efficiency limits of lightweight vehicles. The pressure distribution contour shows high-pressure accumulation at the front and low pressure at the rear of the vehicle, which generates large turbulent wakes in the rear area and contributes to increased drag. These findings indicate that the square rear body design faces significant aerodynamic challenges. Therefore, design strategies such as adding a rear spoiler, using a rear diffuser, and optimizing the rear body angle are suggested as potential solutions to improve flow efficiency.
Co-Authors Abratiguin, Joel O. Ade, Frihapma Semita Afriliardi, Rio Ahmad Arif Ahmad Arif Al Munawir Alamsah Alfiza Candra Andhita Nurul Khasanah Andre Kurniawan Andrizal Andrizal Andrizal Ari Aryadi Asmar Yulastri asrul, asrullah Baehaqi Baharudin, Agus Bahrul Amin Budi Syahri Budi Utomo Wisesa Bulkia Rahim Dandi Bakti Dani Saputra, Hendra Dedi Setiawan Dedy Irfan Donny Fernandez Dori Yuvenda Dwi Sudarno Putra edy susanto Ernawati Ernawati Erzeddin Alwi Fadhli Ranuharja Farah Aulia, Farah Faris Afif Fauzil, Achmat Fauzil Ganefri . Handika, Rival Handini Novita Sari Harmanto, Dani Hasan Maksum Hasanah, Afifah Nur Hendra Dani Saputra Herlando Herman Safar Ichsan Nasution Irma Yulia Basri Irvan Rizky Arya Ismi, Riwayatul Jalil, Muhammad Jheri Hermanto Juli Sardi Kelana, Ananda Jaka Kevin Lisson Putra M Nasir M Nasir M. Sadly Firmansyah Maidi Saputra Martias Martias Martias Martias Martias Martias Masykur Masykur Masykur, Masykur Maulana Ilyas, Taufiq Maulana, Fauzan Milana Milana Miswardi Muhammad Farid Reza Frinison Muhammad Mukhbit Nurdin Muhammad Ridwan Muliady, Rabby Muslikhin Muslim Muslim Muslim Muslim Muzakir Nasution, Ichsan Nizwardi Jalinus Nuzul Hidayat, Nuzul Oktaviani, Ranti Osvaldo Adven Kurniawan Pahlevi, Reza Trio Patrisina, Reinny Pratama Saputra, Agung Pribadyo, Pribadyo Purwanto, Wawan Putra, Randi Purnama Rahmat Hidayat Ramadhan, Miftahuddin Ramadhani, Gustia Refdinal, Refdinal Remon Lapisa Ridho Wahyudi Rifdarmon Rizal Kurniawan Rozi Sastra Purna Sahid, Restu Saputra, Riko Sugiarto, Toto Sulharman Sulharman Suliono Suliono Taufiq, Ilham Toto Sugiarto Utami, Rahayu Hardianti WAGINO Wagino Wahyu Afrizal Wakhinuddin Wakhinuddin S Wanda Afnison Y, Fadhil Yanda Septian Putra Yanto, Doni Tri Putra Yoga Guntur Sampurno Yuke Permata Lisna Zames, Fajri Pratama