Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support, 2015
The present work shows a comparison between computational fluid dynamics (CFD) simulations obtain... more 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-ω 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.
Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support, 2015
The focus on garment aerodynamics is increasing in high velocity sports where aerodynamics is cru... more The focus on garment aerodynamics is increasing in high velocity sports where aerodynamics is crucial such as cycling, speed skating and alpine skiing. Recently published research show that a low drag suit manipulating the flow around the body can considerably enhance an athlete's performance. This project seeks to improve the Norwegian sportswear manufacturer Trimtex Sport AS' pro cycling kit using the best currently available textiles. Changes from the original design are made with the intention of optimizing fabric zones and seam placement. Drag measurements on cylinder models, cyclists and full-scale mannequins of the upper and lower body were conducted in the wind tunnel. The reduction in aerodynamic drag was significant on cylinders, and final power savings of 8 watts due to drag reductions was obtained on the jersey and 5 watts on the bib shorts for a cyclist racing at 50 km/h.
Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support, 2015
The present work shows a comparison between computational fluid dynamics (CFD) simulations obtain... more 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-ω 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.
Proceedings of the 3rd International Congress on Sport Sciences Research and Technology Support, 2015
The focus on garment aerodynamics is increasing in high velocity sports where aerodynamics is cru... more The focus on garment aerodynamics is increasing in high velocity sports where aerodynamics is crucial such as cycling, speed skating and alpine skiing. Recently published research show that a low drag suit manipulating the flow around the body can considerably enhance an athlete's performance. This project seeks to improve the Norwegian sportswear manufacturer Trimtex Sport AS' pro cycling kit using the best currently available textiles. Changes from the original design are made with the intention of optimizing fabric zones and seam placement. Drag measurements on cylinder models, cyclists and full-scale mannequins of the upper and lower body were conducted in the wind tunnel. The reduction in aerodynamic drag was significant on cylinders, and final power savings of 8 watts due to drag reductions was obtained on the jersey and 5 watts on the bib shorts for a cyclist racing at 50 km/h.
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