Comparing the Aerodynamic Behaviour of Real Footballs to a Smooth Sphere Using Tomographic PIV †
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Setup
2.2. Balance Measurements
2.3. Tomographic PIV
3. Results
3.1. Balance Results
3.2. Tomographic PIV Results
4. Discussion
5. Conclusions
- Balance measurements were captured for a range of airspeeds and spin rates for a smooth sphere and a real Telstar football.
- Tomographic PIV data were captured for the first time on a spinning sphere at points coincident with the balance measurements.
- The roughness on the surface of the Telstar ball triggered a change from reverse to conventional Magnus effect in some conditions compared to the smooth ball (Re < 2.5 × 105 at 100 rpm).
- The tomographic PIV measurements identified the traditional horseshoe-shaped wake structure.
- The two vortices move clockwise around the ball when under a conventional Magnus effect and anti-clockwise in a reverse Magnus effect.
- The angular position of these vortices matched well with the experienced side forces.
Funding
Acknowledgments
References
- Passmore, M.; Rogers, D.; Tuplin, S.; Harland, A.; Lucas, T.; Holmes, C. The aerodynamic performance of a range of FIFA-approved footballs. Proc. Inst. Mech. Eng. Part P J. Sport. Eng. Technol. 2012, 226, 61–70. [Google Scholar] [CrossRef]
- Goff, J.E.; Hong, S.; Asai, T. Aerodynamic and surface comparisons between Telstar 18 and Brazuca. Proc. Inst. Mech. Eng. Part P J. Sport. Eng. Technol. 2018, 232, 342–348. [Google Scholar] [CrossRef]
- Alam, F.; Chowdhury, H.; Moria, H.; Fuss, F.K. A comparative study of football aerodynamics. Procedia Eng. 2010, 2, 2443–2448. [Google Scholar] [CrossRef]
- Rogers, D. A Study of the Relationship Between Surface Features and the In-Flight Performance of Footballs; Loughborough University: Loughborough, UK, 2011. [Google Scholar]
- Hong, S.; Asai, T. Effect of panel shape of soccer ball on its flight characteristics. Sci. Rep. 2014, 4, 5068. [Google Scholar] [CrossRef] [PubMed]
- Naito, K.; Hong, S.; Koido, M.; Nakayama, M.; Sakamoto, K.; Asai, T. Effect of seam characteristics on critical Reynolds number in footballs. Mech. Eng. J. 2018, 5, 17-00369. [Google Scholar] [CrossRef]
- Hong, S.; Goff, J.E.; Asai, T. Effect of a soccer ball’s surface texture on its aerodynamics and trajectory. Proc. Inst. Mech. Eng. Part P J. Sport. Eng. Technol. 2019, 233, 67–74. [Google Scholar] [CrossRef]
- Passmore, M.A.; Tuplin, S.; Spencer, A.; Jones, R. Experimental studies of the aerodynamics of spinning and stationary footballs. Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 2008, 222, 195–205. [Google Scholar] [CrossRef]
- Passmore, M.A.; Tuplin, S.; Stawski, A. The real-time measurement of football aerodynamic loads under spinning conditions. Proc. Inst. Mech. Eng. Part P J. Sport. Eng. Technol. 2017, 231, 262–274. [Google Scholar] [CrossRef]
- Carré, M.J.; Goodwill, S.R.; Haake, S.J. Understanding the effect of seams on the aerodynamics of an association football. Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 2005, 219, 657–666. [Google Scholar] [CrossRef]
- Goff, J.E.; Smith, W.H.; Carré, M.J. Football boundary-layer separation via dust experiments. Sport. Eng. 2011, 14, 139–146. [Google Scholar] [CrossRef]
- Asai, T.; Seo, K. Fundamental aerodynamics of the soccer ball. Sport. Eng. 2007, 10, 101–109. [Google Scholar] [CrossRef]
- Adrian, R.J.; Westerweel, J. Particle Image Velocimetry; Cambridge University Press: Cambridge, UK, 2011. [Google Scholar]
- Ruck, S.L.; Spencer, A.; Passmore, M.A. The influence of football surface characteristics on flow separation angle. In Fachtagung ‘Lasermethoden der Strömungsmesstechnik’; Dt. Ges. für Laser-AnemometrieGALA e. V.: Ilmenau, Germany, 2011. [Google Scholar]
- Hong, S.; Asai, T.; Seo, K. Visualization of air flow around soccer ball using a particle image velocimetry. Sci. Rep. 2015, 5, 15108. [Google Scholar] [CrossRef] [PubMed]
- Johl, G.; Passmore, M.; Render, P. Design Methodology and Performance of an Indraft Wind Tunnel. Aeronaut. J. 2004, 108, 465–473. [Google Scholar] [CrossRef]
- Pavia, G.; Varney, M.; Passmore, M.; Almond, M. Three dimensional structure of the unsteady wake of an axisymmetric body. Phys. Fluids 2019, 31, 025113. [Google Scholar] [CrossRef]
- Achenbach, E. Experiments on the flow past spheres at very high Reynolds numbers. J. Fluid Mech. 1972, 54, 565–575. [Google Scholar] [CrossRef]
- Jeong, J.; Hussain, F. On the identification of a vortex. J. Fluid Mech. 1995, 285, 69–94. [Google Scholar] [CrossRef]
- Grandemange, M.; Gohlke, M.; Cadot, O. Statistical axisymmetry of the turbulent sphere wake. Exp. Fluids 2014, 55, 1838. [Google Scholar] [CrossRef]
- Taneda, S. Visual observations of the flow past a sphere at Reynolds numbers between 10000 and 1000000. J. Fluid Mech. 1978, 85, 187–192. [Google Scholar] [CrossRef]
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Ward, M.; Passmore, M.; Spencer, A.; Harland, A.; Hanson, H.; Lucas, T. Comparing the Aerodynamic Behaviour of Real Footballs to a Smooth Sphere Using Tomographic PIV. Proceedings 2020, 49, 150. https://doi.org/10.3390/proceedings2020049150
Ward M, Passmore M, Spencer A, Harland A, Hanson H, Lucas T. Comparing the Aerodynamic Behaviour of Real Footballs to a Smooth Sphere Using Tomographic PIV. Proceedings. 2020; 49(1):150. https://doi.org/10.3390/proceedings2020049150
Chicago/Turabian StyleWard, Matthew, Martin Passmore, Adrian Spencer, Andy Harland, Henry Hanson, and Tim Lucas. 2020. "Comparing the Aerodynamic Behaviour of Real Footballs to a Smooth Sphere Using Tomographic PIV" Proceedings 49, no. 1: 150. https://doi.org/10.3390/proceedings2020049150
APA StyleWard, M., Passmore, M., Spencer, A., Harland, A., Hanson, H., & Lucas, T. (2020). Comparing the Aerodynamic Behaviour of Real Footballs to a Smooth Sphere Using Tomographic PIV. Proceedings, 49(1), 150. https://doi.org/10.3390/proceedings2020049150