Abstract
The time trial bicycle, helmet and mannequin digital models were obtained from a cloud-based open-source library of computer aided design files (Mundy, 2012; Nestell, 2015; Vinayagamoorthy, 2017, respectively), and were modified using SolidWorks 2022. The bicycle geometry features an open five-spoke front wheel, disk rear wheel, vortex generators at the seat tube and a standard time-trial handlebar without aero bar. Certain details of the bicycle, such as the crank, drive train and chain stay were not included since they were considered to have a negligible impact on the flow field, and to avoid part failure during the additive manufacturing process. The wheel hub and pedals were simplified. To guarantee the model was strong and stiff enough to survive the experimental environment, the seat stay and front fork were thickened. Vertical reinforcement features were added to the bicycles to fix the model to a thin structural base. Further details are contained in Arbelo Romero (2023).Please use any CAD software to open the step or stl files. We used a Prusa MINI+ (PLA with 60% infill) to 3D print the model in our work. Mundy, B. (2012). Time-trial bicycle. https://grabcad.com/library/tt-bike. Nestell, W. (2015). Time-trial helmet. https://grabcad.com/library/tt-race-helmet-1. Vinayagamoorthy, D. (2017). Flexi-robot assembled. https://grabcad.com/library/flexi-robot-assembled-1. Arbelo Romero, J. M. (2023). Strategies to obtain an aerodynamic advantage in time trials. MEng Thesis. University of Surrey.