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Journal : Journal of Mechanical Engineering Science and Technology

 1 
Investigation of Drag Force and Downforce on Two Racing Motorcycles in Slipstream Conditions Hanifudin, Muhamad; Jatisukamto, Gaguk; Darsin, Mahros; Kustanto, Muh. Nurkoyim; Saleh, Azmi; Prasetyono, Suprihadi; Sarwono, Catur Suko
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025052

Abstract

The performance of modern racing motorcycles is greatly influenced by their aerodynamics. Slipstreaming occurs during a race when a rider closely follows another, especially on a straight track. The effect can reduce aerodynamic drag and increase the overall speed of the rider behind. This study investigates the aerodynamic effects of slipstreaming on a racing motorcycle using computational fluid dynamics. This study also considers its effect on both drag force and downforce, which affects motorcycle stability. A 3D CAD model of a racing motorcycle and a rider in a crouching position was used as the object of research. CFD simulations were carried out using the RANS Steady State solver with the k-ω-SST turbulence model. The simulations evaluated the effect of varying distances between motorcycles on slipstream performance, as well as varying motorcycle speeds. The results show the effect on drag force and downforce for the trailing motorcycle. This is due to the shielding effect of the motorcycle in front, which creates a low-pressure zone behind it. Additionally, the turbulence behind the racing motorcycle also affects its downforce. Optimizing the distance between motorcycles in the slipstream allows riders to improve overtaking performance. It also reduces adverse effects on motorcycle stability caused by the slipstream's influence on downforce. Furthermore, it can be used to develop aerodynamic modifications to racing motorcycles that can utilize the slipstream more effectively.
Co-Authors Agung Tri Utomo Agustinus Fritz Wijaya Akbar, Muhammad Fakhri Alim Budhi Utomo Alliong Kurniawan Andrita Ceriana Eska Anthonio Stefanus Anto Budiharjo Arnoldus, Arnoldus Asmara, Ellend Sekar Ayu Ayu Puspita Sari, Denis Azmi Saleh Bambang Sri Kaloko Billy Gerardhy Lainsamputty Birmanti Setia Utami Catur Suko Sarwono Dewanti, Ardelia Dikky Wahyudi Doktorasaintifika, Heradita Kaniaazzahra Eka, Prastya Muhammad Elyan Mesakh Kowi Endang Kusdiyantini Fahmi, Maya Fitriana Ilul Fransiskus Ariyanto Gaguk Jatisukamto Gowell, Kent Gozali, Moch. Habibie, Aziiz Rahmat Hanifudin, Muhamad Herida, Azalia Puspa Hermin Pancasakti Kusumaningrum Hindarto, Jehosaphat Adelar Immawan Wicaksono Jonathan, Ricky Kawi, R. Gibranto Kores Enrrique Igglacious Bonsapia Kurniawan, Alliong Kustanto, Muh. Nurkoyim Leonardo Ade Pradana Putra Lina Sinatra Wijaya Mahardhika, Wahyu Aji Mahmudah, Hawari Rosdiana Mahros Darsin MG Isworo Rukmi Mufida, Naimatul Muh Asnoer Laagu Muhammad Zainuri Narwastu Jati Grasias Nata, Andrian Anwar L Nikolaus Triwindi Arvianto Noviasih, Ria Frasida Nugroho, Ardra Maulana Adwitiya Nurcahyo, Rizky Pitaloka, Gendis Angger Pradana Putra, Leonardo Ade Prasetyo, Landhung Budhi Priyadi, Jonathan Mario Dwi Putra, Dewa Asmara Radius Tanone Rama Aufadha Risqullah Ramos Somya Rendra Bagus Setiawan Richard Gordon Mayopu Rini Kartika Hudiono Riswan Rudy Latuperissa Sari, Suli Arum Siti Maisaroh Siti Nur Jannah Sri Pujiyanto Sulis Setyowati, Sulis Susiana Purwantisari Triwahju Hardianto Triwindi Arvianto, Nikolaus Wahyudi, Dikky Wahyuningsih, Candra Wijanarka Wijanarka Wijarnaka, Wijarnaka Wulan Dwi Novemianti Yehezkiel Adi Surya Pratama Yonsi Rendra Hanggawan Zega, Theoputra Berkat