Study on the modification of diffuser to the effect on aerodynamic of the F1 in schools car

Lim, Yik Seng (2021) Study on the modification of diffuser to the effect on aerodynamic of the F1 in schools car. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

F1 IN SCHOOLS is a global competition that promote exciting ways for students with the age range from 9 to 19 to study subject related with Science, Technology, Engineering and Mathematics (STEM). The goal in the competition is to finish the race on a 20 m track with the shortest time possible. There are two factors which affect the aerodynamic performance which are the drag and lift force. Drag force and extra downforce will slow down the speed of the car while extra lift force will cause imbalance of the car. Thus, study on the modification of underbody diffuser is important as it enables the control both drag and lift force of the car. Therefore, the objective of this study is to produce flow analysis on the F1 IN SCHOOLS Car. besides, this study aims to investigate the effect of diffuser angle on the drag and lift coefficient of the fast-moving car. Moreover, this study also aims to evaluate appropriate diffuser angle for maintaining suitable lift coefficient of the car. Tools that will be used in this study is by using Autodesk Fusion 360 for 3D modelling of the car and the CFD simulation will be run using Ansys Fluent. Before conducting CFD simulation for simplified 2D, 3D and complete 3D model analysis, mesh density analysis is done to obtain proper surface mesh element size that converges the result. Besides, comparison between own simulation results with previous wind tunnel test result is done to verify the fluent setting used. Ahmed body simulation result is then done to obtain the relationship between various angle of diffuser with drag and lift coefficient. The simulation results of simplified 2D, 3D and complete 3D model analysis shows different optimum diffuser angle for best aerodynamic performance. Besides, the result also shows that lift coefficient decreases as diffuser angle increases.

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