Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 61, Issue 2 (2019) 248-252 248 Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Journal homepage: www.akademiabaru.com/arfmts.html ISSN: 2289-7879 Conceptual Design and Simulation of Rear Pressure Different Air Flow Correction Device Using Computational Fluid Dynamic (CFD) Muhammad Nur Othman 1,* , Qamar Fairuz Zahmani 1 , Mohd Faruq Abdul Latif 1 , Muhammad Faridhwan Shofri 1 , Ahmad Yusuf Ismail 2 1 Faculty of Mechanical and Manufacturing Engineering Technology, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia 2 Department of Mechanical Engineering, Institut Teknologi Adhi Tama Surabaya, Sukolilo, Kota SBY, Jawa Timur 60117, Indonesia ARTICLE INFO ABSTRACT Article history: Received 16 April 2019 Received in revised form 21 August 2019 Accepted 2 September 2019 Available online 29 September 2019 Drag reduction is one of the most significant issues within the automotive industry. Pressure drag contributed more than 80% of the total drag and it is highly dependent on vehicle geometry due to boundary layer separation and formation of wake region behind the vehicle. The drag caused by pressure difference at the rear and front of the vehicle is a major issue for all car segments especially bluff body car segments because it contributed largest fuel consumption. Air suction or blown at the rear of the bluff body can alter the flow pattern of the air hence. This resulted in shrinking at the wake region which resulting in an increase of rear pressure and reduces the pressure difference between front and rear of the body. The objective of this study is designing a concept of drag reduction system that can change the pressure distribution and reduce drag coefficient (CD) of bluff body which is represented as Ahmed body model. The design and testing of the airflow correction device were aided by Computer-aided Design (CAD) and computational fluid dynamic (CFD). The concept of the rear air flow correction device altered the flow pattern which changes the pressure distribution and reduces drag coefficient by 4.5352%. Hence, with full of positive expectation, hopefully, this method of reducing drag by using rear suction or blown air flow correction device will be broadly used for bluff body car segments. Keywords: Drag reduction; Aerodynamics; Weight region; Boundary layer separation; Turbulence model Copyright © 2019 PENERBIT AKADEMIA BARU - All rights reserved 1. Introduction High pressure drag was created at the back of vehicle especially vehicle with a bluff body car segment which include multi-purpose vehicle (MPV), van, suburban utility vehicle (SUV), hatchback, and station wagon. This drag caused by large pressure difference between front and rear of the vehicle and as a result increase the fuel consumption [1-3]. A lot of studies done by other researchers * Corresponding author. E-mail address: muhammadnur@utem.edu.my (Muhammad Nur Othman) Open Access