Sports Engineering

, Volume 18, Issue 2, pp 93–103 | Cite as

Aerodynamic drag interactions between cyclists in a team pursuit

  • Nathan Barry
  • David Burton
  • John Sheridan
  • Mark Thompson
  • Nicholas A. T. Brown
Original Article

Abstract

Performance in cycling events is strongly dependent on aerodynamic drag due to the high proportion of resistance that it contributes. The drag of individual cyclists has been shown to vary with riding posture and the drag of cyclists travelling in close proximity will vary as a function of separation distance. However, the influence of riding posture and the interplay between cyclists in a team is a complex problem that is not well understood. This study aims to develop a better understanding of the aerodynamic drag interactions between cyclists riding in a team as a function of their riding position. A team of four athletes was tested in the Monash University Wind Tunnel using a bespoke force balance that can measure drag on all four athletes simultaneously. Compared to an individual rider, the four riders in a team experienced mean drag savings of 5, 45, 55 and 57 % in positions 1, 2, 3 and 4 of the team, respectively. The results of individual athlete tests were shown to be a good indicator of drag response when applied in a team environment. Strong aerodynamic interactions were observed between the riders in a pursuit team. However, these varied significantly and appear to be unique functions of individual athlete body shape. Given the small winning margins at the elite level, a detailed understanding of the interactions between riders will deliver a performance edge. However, it appears necessary to test the actual athletes in situ to fully optimise performance as general trends were not consistent.

Keywords

Cycling Aerodynamics Drag Interactions Geometry Posture Drafting Pursuit Team 

References

  1. 1.
    Kyle CR, Burke ER (1984) Improving the racing bicycle. Mech Eng J Am Soc Mech Eng 106:34–45Google Scholar
  2. 2.
    Grappe F, Candau R, Bello A, Rouillon JD (1997) Aerodynamic drag in field cycling with special reference to the Obree’s position. Ergonomics 40(12):1299–1311CrossRefGoogle Scholar
  3. 3.
    Kyle CR, Weaver MD (2004) Aerodynamics of human-powered vehicles. In: Proceedings of Institution of Mechanical Engineers, Part A: Journal of Power and Energy 218(141), doi:10.1243/095765004323049878
  4. 4.
    Pannel JR, Griffith EA, Coals JD (1915) Experiments on the interference between pairs of aeroplane wires of circular and lenticular cross section. Reports and Memoranda—Aeronautical Research Council (Great Britain), Report 208Google Scholar
  5. 5.
    Biermann D and Herrnstein WH Jr (1933) The Interference between struts in various combinations. Report National Advisory Committee for Aeronautics, Report No. 468Google Scholar
  6. 6.
    Zdravkovich MM (1977) Review of flow interference between two circular cylinders in various arrangements. J Fluids Eng 99(4):618–633. doi:10.1115/1.3448871 CrossRefGoogle Scholar
  7. 7.
    Zdravkovich MM, Pridden DL (1977) Interference between two circular cylinders; series of unexpected discontinuities. J Ind Aerodyn 2:255–270CrossRefGoogle Scholar
  8. 8.
    Romberg GF, Chianese F Jr, Lajoie RG (1971) Aerodynamics of race cars in drafting and passing situations. Society of Automotive Engineers, Technical Paper 710213Google Scholar
  9. 9.
    Ioannou PA (1997) Automated highway systems. Plenum Press, New YorkCrossRefGoogle Scholar
  10. 10.
    Hammache M, Michaelian M, Browand F (2001) Aerodynamic forces on truck models, including two trucks in tandem. California PATH Research Report, University of California BerkeleyGoogle Scholar
  11. 11.
    Watkins S, Vino G (2008) The effect of vehicle spacing on the aerodynamics of a representative car shape. J Wind Eng Ind Aerodyn 96:1232–1239CrossRefGoogle Scholar
  12. 12.
    Zdravkovich MM, Ashcroft MW, Chisholm SJ, Hicks N (1996) Effect of Cyclist’s Posture and Vicinity of Another Cyclist on Aerodynamic Drag. The Engineering of Sport 1Google Scholar
  13. 13.
    Kyle CR (1979) Reduction of wind resistance and power output of racing cyclists and runners travelling in groups. Ergonomics 22(4):387–397. doi:10.1080/00140137908924623 CrossRefGoogle Scholar
  14. 14.
    Broker JP, Kyle CR, Burke ER (1999) Racing cyclist power requirements in the 4,000 m individual and team pursuits. Med Sci Sports Exerc 31(11):1677–1685CrossRefGoogle Scholar
  15. 15.
    Blocken B, Defraeye T, Koninckx E, Carmeliet J, Hespel P (2013) CFD Simulations of the aerodynamic drag of two drafting cyclists. Comput Fluids 71:435–445CrossRefGoogle Scholar
  16. 16.
    Defraeye T, Blocken B, Koninckx E, Hespel P, Verboven P, Nicolai B, Carmeliet J (2013) Cyclist drag in team pursuit: influence of cyclist sequence, stature and arm spacing. J Biomech Eng 136:011005-1–011005-9. doi:10.1115/1.4025792 CrossRefGoogle Scholar
  17. 17.
    McCole SD, Claney K, Conte JC, Anderson R, Hagberg JM (1990) Energy expenditure during bicycling. J Appl Physiol 68:748–753Google Scholar
  18. 18.
    Torre AI, Íñiguez J (2009) Aerodynamics of a cycling team in a time trial: does the cyclist at the front benefit? Eur J Phys 30:1365–1369CrossRefGoogle Scholar
  19. 19.
    Gibertini, G, Campanardi, G, Grassi, D, Macchi C (2008) Aerodynamics of biker position. BBAA VI International Colloquim on: Bluff Bodies Aerodynamics & ApplicationsGoogle Scholar
  20. 20.
    García-López J, Rodríguez-Marroyo JA, Juneau C-E, Peleterio J, Martínez AC, Villa JG (2008) Reference values and improvement of aerodynamic drag in professional cyclists. J Sports Sci 26(3):277–286CrossRefGoogle Scholar
  21. 21.
    Defraeye T, Blocken B, Koninckx E, Hespel P, Carmeliet J (2010) Aerodynamic study of different cyclist positions: CFD and full-scale wind-tunnel tests. J Biomech 43:1262–1268CrossRefGoogle Scholar
  22. 22.
    Underwood I, Schumacher J, Burette-Pommary J, Jermy M (2011) Aerodynamic drag and biomechanical power of a track cyclist as a function of shoulder and torso angles. Sports Eng 14:147–154CrossRefGoogle Scholar
  23. 23.
    Oggiano L, Leirdal S, Saetran L, Ettema G (2008) Aerodynamic optimization and energy saving of cycling postures for international elite cyclists. Eng Sport 7:597–604Google Scholar
  24. 24.
    Edwards AG, Byrnes WC (2007) Aerodynamic characteristics as determinants of the drafting effect in cycling. Med Sci Sport Exerc. doi:10.1249/01.mss.0000239400.85955.12 Google Scholar
  25. 25.
    Mercker E, Wiedemann J (1996) On the correction of interference effects in open jet wind tunnels. Society of Automotive Engineers, Technical Paper 960671Google Scholar
  26. 26.
    Barry N, Burton D, Crouch T, Sheridan J, Luescher R (2012) Effect of crosswind and wheel selection on the aerodynamic behaviour of a cyclist. Engineering of Sport 9. Proc Eng 34:20–25CrossRefGoogle Scholar
  27. 27.
    Martin JC, Douglas ML, Cobb JE, McFadden KL, Coggan AR (1998) Validation of a mathematical model for road cycling power. J Appl Biomech 14:276–291Google Scholar
  28. 28.
    Kyle, CR (1986) Mechanical factors affecting the speed of a cycle. In: Burke ER (ed) Science of Cycling Human Kinetics, California, USAGoogle Scholar
  29. 29.
    Wilson DG (2004) Bicycle Science. The MIT Press, CambridgeGoogle Scholar
  30. 30.
    Crouch TN, Burton D, Brown NAT, Thompson MC, Sheridan J (2004) Flow topology in the wake of a cyclist and its effect on aerodynamic drag. J Fluid Mech 748:5–35CrossRefGoogle Scholar

Copyright information

© International Sports Engineering Association 2015

Authors and Affiliations

  • Nathan Barry
    • 1
  • David Burton
    • 1
  • John Sheridan
    • 1
  • Mark Thompson
    • 1
  • Nicholas A. T. Brown
    • 2
  1. 1.Department of Mechanical and Aerospace EngineeringMonash UniversityClaytonAustralia
  2. 2.Australian Institute of SportBelconnenAustralia

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