Motorcycle Drag Reduction using a Streamlined Object Ahead of the Rider

  • Thirukumaran Selvamuthu
  • Murugan ThangaduraiEmail author
Original Contribution


Aerodynamics design of various components plays a significant role in reducing the overall drag of the vehicle to improve the fuel efficiency. In the present study, the effects of a semi-ellipsoidal structure placed ahead of a rider on the HONDA CBR 600 RR bike have been studied in detail for Reynolds number varying from 1.24 to 3.72 million. Three-dimensional numerical simulations were performed by solving the Reynolds averaged Navier-Stokes equations with the SST k–ω turbulence model. The numerical results were validated with the wind tunnel testing performed on a 1:12 scale down model using an external pyramidal balance. It has been observed that the wake pattern behind the vehicle, pressure and velocity distribution over the vehicle were modified remarkably by the inclusion of semi-ellipsoidal structure compared to the model with the rider. The drag coefficient of the bike was increased about 16% by placing a dummy rider over the vehicle. However, it decreased substantially and reached close to the base model value when the semi-ellipsoidal structure placed ahead of the rider. Further, the inclusion of semi-ellipsoidal structure produced a negative lift which improves the traction on the road compared to the base model.


Bike aerodynamics CFD Wind tunnel testing Turbulence modeling Drag reduction 


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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringThiagarajar College of EngineeringMaduraiIndia
  2. 2.Energy Research and Technology Group Thermal Engineering DepartmentCSIR-Central Mechanical Engineering Research InstituteDurgapurIndia

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