Aerodynamical Resistance in Cycling - CFD Simulations and Comparison with Experiments

Luca Oggiano, Lars Morten Bardal, Lars Sætran, Live Spurkland

2015

Abstract

The present work shows a comparison between computational fluid dynamics (CFD) simulations obtained using the Unsteady Reynolds Averaged Navier-Stokes solver STARCCM+ from CD-Adapco and experiments carried out in the subsonic wind tunnel at NTNU. The models tested in the wind tunnel (a mannequin and real cyclist in static position) were 3D scanned using a 3D scanner, consisting 48 single-lens reflex cameras surrounding the object in three heights (low/ground-midi-above). A hybrid meshing technique was used in order to discretize the surface and the volume. Polyhedral cells were used on the model surface and in the near volume while a structured grid was used in the rest of the domain. An unsdeady RANS approach was used and the turbulence was modelled using the Menter implementation of the k-? model. No wall functions were used and the boundary layer was fully resolved. The first part of the paper focuses on the mannequin while in the second part the comparison between the experimental results and simulation on the real cyclist are presented. An overall good agreement between the simulations and the experiments was found proving that CFD could be a complementary tool to wind tunnel testing.

References

  1. Blocken, B., Defraeye, T., Koninckx, E., Carmeliet, J. & Hespel, P. 2013. Cfd simulations of the aerodynamic drag of two drafting cyclists. Computers & Fluids, 71, 435-445.
  2. Brownlie, L. 1992. Aerodynamic characteristics of sports apparel. Simon fraser university.
  3. Brownlie, L., Gartshore, M., Mutch, B. & Banister, B. 1987. Influence of apparel on aerodynamic drag in running. The Annals of Physiological Anthropology, 6, 133-143.
  4. Brownlie, L., Kyle, C. R., Carbo, J., Demarest, N., Haber, E., Macdonald, R. & Nordstrom, M. 2009. Streamlining the time trial apparel of cyclists: the nike swift spin project. Sports technology, 1-2, 53-60.
  5. Cd-adapco 2015. Starccm+ user guide.
  6. Chung, T. J. 2002. Computational fluid dynamics, Cambridge University Press.
  7. De Groot, G., Sargeant, A. & Geysel, J. 1995. Air friction and rolling resistance during cycling. Medicine and science in sports and exercise, 27, 1090-1095.
  8. Debraux, P., Grappe, F., Manolova, A. V. & Bertucci, W. 2012. Aerodynamic drag in cycling: methods of assessment. Sports biomechanics, 10, 197-218.
  9. Defraeye, T., Blocken, B., Koninckx, E., Hespel, P. & Carmeliet, J. 2010a. Aerodynamic study of different cyclist positions: CFD analysis and full-scale windtunnel tests. . Journal of biomechanics, 43, 1262-1268.
  10. Defraeye, T., Blocken, B., Koninckx, E., Hespel, P. & carmeliet, j. 2010b. Computational fluid dynamics analysis of cyclist aerodynamics: performance of different turbulence-modelling and boundary-layer modelling approaches. Journal of Biomechanics, 43, 2281-2287.
  11. Defraeye, T., Blocken, B., Koninckx, E., Hespel, P. & Carmeliet, J. 2011. Computational fluid dynamics analysis of drag and convective heat transfer of individual body segments for different cyclist positions. Journal of Biomechanics, 44, 1695-701.
  12. Di Prampero, P. E. 2000. Cycling on earth, in space and on the moon. European Journal Applied of Physiology, 82, 345-360.
  13. Hanna, R. K. 2002. Can CFD make a performance difference in sport? In: Haake SJ, E. (ed.) The Engineering of Sport 4. Oxford: blackwell science.
  14. Launder, B. E. & sharma, B. I. 1974. Application of the energy dissipation model of turbulence to the calculation of flow near a spinning disc. Letters in Heat and Mass Transfer, 1, 131-138.
  15. Lecrivain, G., Slaouti, A., Payton, C. & Kennedy, I. 2008. Using reverse engineering and computational fluid dynamics to investigate a lower arm amputee swimmer's performance. Journal of Biomechanics, 13, 2855-2859.
  16. Lukes, R. A., S.B., C. & S.J, H. 2002. The understanding and development of cycling aerodynamics. Sports engineering, 8, 59-74.
  17. Menter, F. R. 1994. Two-equation eddy-viscosity turbulence models for engineering applications. Aiaa journa, 32, 1598-1605.
  18. Minetti, A. E., Machtsiras, G. & C., M. J. 2009. The optimum finger spacing in human swimming. Journal of biomechanics, 42, 2188-90.
  19. Oggiano, L. & Saetran, L. 2012. Experimental analysis on parameters affecting drag force on speed skaters. Sports technology, 3, 223-234.
  20. Oggiano, L., Saetran, L., Leirdal, S. & Ettema, G. 2008. Aerodynamic optimization and energy saving of cycling postures for international elite level cyclists. The Engineeeing of Sport 7, 597-604.
  21. Oggiano, L., Troynikov, O., Konopov, I., Subic, A. & F., a. 2009. Aerodynamic behaviour of single sport jersey fabrics with different roughness and cover factors. Sports Engineering, 12, 1-12.
  22. Spalart, P. R. 2000. Strategies for turbulence modelling and simulations. Int. J. Heat Fluid Flow 21 (3), 252- 263.
  23. Underwood, L. 2012. Aerodynamics of track cycling. Doctor of philosophy, the University of Canterbury.
  24. Underwood, L. & Jermy, M. C. Fabric testing for cycling skinsuits. 5th Asia-pacific congress on sports technology (APCST), 2011 Melbourne. 350-356.
  25. Wilcox, D. C. 2006. Turbulence modelling for CFD, la Canada, California, USA.
  26. Zaïdi, H., Fohanno, S., Taïar, R. & Polidori, g. 2010. Turbulence model choice for the calculation of drag forces when using the CFD method. Journal of Biomechanics, 10, 405-11.
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Paper Citation


in Harvard Style

Oggiano L., Morten Bardal L., Sætran L. and Spurkland L. (2015). Aerodynamical Resistance in Cycling - CFD Simulations and Comparison with Experiments . In Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support - Volume 1: icSPORTS, ISBN 978-989-758-159-5, pages 183-189. DOI: 10.5220/0005590101830189


in Bibtex Style

@conference{icsports15,
author={Luca Oggiano and Lars Morten Bardal and Lars Sætran and Live Spurkland},
title={Aerodynamical Resistance in Cycling - CFD Simulations and Comparison with Experiments},
booktitle={Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support - Volume 1: icSPORTS,},
year={2015},
pages={183-189},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005590101830189},
isbn={978-989-758-159-5},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support - Volume 1: icSPORTS,
TI - Aerodynamical Resistance in Cycling - CFD Simulations and Comparison with Experiments
SN - 978-989-758-159-5
AU - Oggiano L.
AU - Morten Bardal L.
AU - Sætran L.
AU - Spurkland L.
PY - 2015
SP - 183
EP - 189
DO - 10.5220/0005590101830189