aerodynamic development of a time-trial bicycle helmet...
TRANSCRIPT
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Aerodynamic Development of a Time-Trial Bicycle
Helmet: from CFD to Tour de France
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LX R&D IS A CONSULTING FIRM SPECIALIZED IN
ENGINEERING SIMULATION & PRODUCT DEVELOPMENT
CFD FEA
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LOUIS GARNEAU OFFERS A CYCLING SOLUTION WHICH
INCLUDES A ONE STOP SHOP FOR ALL YOUR CYCLING NEEDS.
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TT Helmet Development history
5
Prologue 2004 Rocket 2006
SuperLeggera 2008 Rocket Air 2007
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Development Process
Before: without CAE
6
Clay Model Tooling Prototypes
Wind Tunnel
Testing
Go to market
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Development Process
Now: with CAE
7
3D CAD CFD/CAD iterations
Rapid Prototyping
Wind Tunnel Testing
Tooling Go to
market
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Analysis of SuperLeggera
• 3D scan of helmet
• 3D scan of cyclist
• CFD Analysis
• Correlation with wind tunnel tests
8
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Ideas for improvement
• Reduce frontal area (structural design)
• Improve air intake position & internal ventilation
ducts
• Reduce helmet sensitivity to angle of attack and
cross-winds
• Keep dimples (marketing)
9
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Vortex generators
10
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Scan + 3D CAD
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Scan + 3D CAD
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CFD Analysis: Meshing
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CFD Analysis: Meshing
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CFD Analysis: Set-up
• Mesh : 10 M polys
– volumetric controls around cyclist, helmet and
wake
• Speed : 60 km/h
• Turbulence model : SST (Menter) K-Omega
– y+ most around one, majority below 10
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CFD Analysis: Frontal Area
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Internal Ventilation Ducts
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CFD Analysis: Ventilation
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CFD Analysis: Ventilation
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CFD Analysis: Vortex generators
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CFD Analysis: Vortex Generators
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CFD Results
Reduced drag
Less sensitivity to angle of attack
Improved ventilation
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Advantages of CFD
PERFORMANCE
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Wind Tunnel Testing
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Wind Tunnel Testing
Choice of Mirinda Carfrae, World Champion Triathlete
Wind tunnel test: Superior drag reduction & ventilation
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CFD for Marketing
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Tour de France TT
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QUESTIONS?