aerodynamic development of a road cycling
TRANSCRIPT
Aerodynamic Development of a Road Cycling
Helmet: Breakaway with CFD
3
• Louis Garneau offers a cycling solution which
includes a one stop shop for all your cycling needs.
ENGINEERING
SIMULATION
CFD FEA
Goal:
Design the most aerodynamic
cycling helmet for road racing
without compromising ventilation
CFD of existing helmets
3D CAD CFD/CAD iterations
Rapid Prototyping
Wind tunnel testing
Tooling
Design Process
6
Analysis of existing helmets
7
Specialized Prevail LGS X-Lite
LGS Quartz Giro Aeon
Analysis of existing helmets
V CdA
LGS Quartz
42 km/hr
0.0105
LGS X-Lite 0.0115
Giro Aeon 0.0134
Specialized
Prevail
0.0098
8
LGS X-Lite
Ideas for improvement
• Design helmet with
respect to head angle
• Reduce frontal area
by allowing air straight
through;
• Adjust tail angle;
• Adjust bridges angles;
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LGS Quartz
3D CAD
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3D CAD
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Scan + 3D CAD
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CFD Analysis Set-up
• 31 million elements
• Steady state
• Spalart-Almaras
• Low-Reynolds wall
– 15 layers
– Y+ <= 1
• 42 km/hr
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CFD Analysis: Virtual Wind tunnel
CFD Analysis: Virtual Wind tunnel
CFD Analysis: Virtual Wind tunnel
CFD Analysis: Virtual Wind tunnel
CFD Analysis: Virtual Wind tunnel
Achievements
• 17.7% drag reduction compared to
best helmet tested
• Reduced frontal area
• Increased ventilation
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Benefits of CFD
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PERFORMANCE
Wind Tunnel Testing: NRC
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Wind Tunnel Testing Results
29 -3,0%
-2,0%
-1,0%
0,0%
1,0%
2,0%
3,0%
4,0%
5,0%
Course Quartz Edge Diamond S-WorksPrevail
Giro Aeon Giro Atmos CatlikeWhisper
LazerHelium
ChronoLegera
Pe
rfo
rman
ce in
cre
ase
Performance increase w/r to LGS Quartz
Wind Tunnel Testing:
Course VS GIRO Air Attack
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Wind Tunnel Testing Results
31
Team Europcar
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Thank you!
Questions?