The document discusses simulations that were run to evaluate the aerodynamic performance of an isolated wing and a wing mounted on an FSAE car model. 2D simulations were used to capture general trends while 3D validations provided more accurate force predictions. Simulations of the car model exiting a corner, braking into a corner, and in mid-corner provided downforce and center of pressure values. The objective of designing an aerodynamics package is described as keeping the team competitive by increasing points through downforce. Analytical simulations targeted a downforce of 170N at 40km/hr with a 10% forward bias of the center of pressure relative to the center of gravity. The conclusion was that the downforce and center

1. SIMULATIONS
EVALUATING WING—ISOLATION
2D Design of Experiments (DOE)
Run Time : 1 min
Purpose : Capture general trends
Force Prediction : Over estimate
3D Validation
Run Time : 1 hour
Purpose : Validate 2D DOE
Force Prediction : Accurate
EVALUATING WING—ON R16
Evaluation Aerodynamic Package
Aerodynamic Model— Figure 4
Exiting out of corner :
Car Model : 0o
pitch, 0o
yaw, 0o
roll
Downforce : 180 N at 40km/hr
COP : 11% forward bias of COG
Braking into corner :
Car Model : 1.5o
pitch forward, 0o
yaw, 0o
roll
Downforce : 198 N at 40km/hr
COP : 5% forward bias of COG
Mid Corner :
Car Model : Rotating Domain (Figure 5,6)
0o
pitch, 10o
yaw, 1.5o
roll
Downforce : 130 N at 40km/hr
COP : 11% forward bias of COG
INTRODUCTION
Aerodynamics Package
Advantages : Downforce increases cornering speed
Faster Lap Times, more points
Disadvantages : Drag decreases linear acceleration
Package increases weight and Centre of Gravity (COG)
Knowledge Gap : Never designed for RMIT’s car
Objective : Design an aerodynamics package that can keep
RMIT competitive by increasing points.
DESIGNING AN AERODYNAMICS PACKAGE FOR THE
FSAE CAR
From Hashan Mendis s3449757
ANALYTICAL APPROACH
Target Downforce : 170 N at 40 km/hr
Points : Gain 38 points
Cornering Situation : Exiting out of corner, Braking into cor-
ner, Mid Corner
Decision Matrix : Focus resources on front and rear wing
Centre of Pressure (COP) : Net moment created by all aero-
dynamic forces (Figure 1)
10 % forward bias of COG to reduce understeer
Front Wing downforce : 90 N at 40 km/hr
Rear Wing downforce : 78 N at 40 km/hr
Figure 1— Aerodynamic Forces on car
Figure 4—Simulation 3D model with Aerodynamic Package
Figure 5—Rotating Domain
CONCLUSION
Downforce : 10 % more than required
COP : Kept forward of COG
Points : Able to capture 38 points
RECOMMENDATION
Future : Wind Tunnel Validation
Track Testing
Increase ground clearance on Front
wing
Triple Element Front Wing
Diffuser
Figure 6—Mid Corner flow structure