This is an open access article under the CC BY-NC-ND license Moreover, the flow around the racer is visualized in the CFD model to reveal the drag distribution of each part of the racer by studying the vortex structure. In the present study, the relationship between the racer's speed and total drag in the full tuck posture is identified by combining EFD using the wind tunnel and CFD using the lattice Boltzmann method. Revealing the drag distribution based on an understanding of the flow field around the racer will also provide the basis for new gliding postures and novel designs for skiing equipment. In particular, it is important to estimate the drag distribution for each part of the racer's body, and CFD makes such visualization possible. A more effective way to visualize the flow around the racer and examine the aerodynamic characteristics is to use Computational Fluid Dynamics (CFD) along with Experimental Fluid Dynamics (EFD) in a wind tunnel. Īlthough the total drag on a racer can be calculated by wind tunnel experiments, it is extremely difficult to measure the drag distribution across each part of the body. To date, research on air resistance in alpine skiing has considered actual racers in wind tunnels to examine the relation between the gliding posture and the magnitude of drag, and for designing skiing equipment such as the racers' suits. Air resistance significantly affects the competition timings. In alpine skiing events such as downhill and super-giant slalom, racers often exceed speeds of 120 km/h. Peer-review under responsibilityof theorganizing committeeofISEA2016 This is an open access article under the CC BY-NC-ND license (). Moreover, the visualization of the flow field indicates that the primary drag locations at a flow velocity of 40 m/s are the head, upper arms, lower legs, and thighs (including the buttocks). The results show that the total drag force in the downhill racer model is 27.0 N at a flow velocity of 15 m/s, increasing to 185.8 N at 40 m/s. Furthermore, we visualized the flow around the downhill racer and examined its vortex structure. In the present study, we used computational fluid dynamics with the lattice Boltzmann method to derive the relationship between flow velocity in the full tuck position (the downhill racer's speed) and total drag. However, these studies have not revealed the flow velocity distribution and vortex structure around the skier. To date, studies on air resistance in alpine skiing have used wind tunnels and actual skiers to examine the relationship between the gliding posture and magnitude of drag, as well as for the design of skiing equipment. In downhill alpine skiing, racers often exceed speeds of 120 km/h, with air resistance substantially affecting the overall race times. Takeshi Asaia*, Sungchan Honga, Koichi IjuinbĪUniversity of Tsukuba, Institute of Health and Sports Sciences, Tsukuba, 305-8574, Japan bExa Japan Inc., Yokohama Mitsui Bldg 23F, Yokohama, 220-0011, Japan Moreover, the visualization of the flow field indicates that the primary drag locations at a flow velocity of 40 m/s are the head, upper arms, lower legs, and thighs (including the buttocks).ġ1th conference of the International Sports Engineering Association, ISEA 2016įlow visualization of downhill ski racers using computational fluid The results show that the total drag force in the downhill racer model is 27.0N at a flow velocity of 15 m/s, increasing to 185.8N at 40 m/s. ![]() ![]() In downhill alpine skiing, racers often exceed speeds of 120km/h, with air resistance substantially affecting the overall race times. Abstract of research paper on Materials engineering, author of scientific article - Takeshi Asai, Sungchan Hong, Koichi Ijuin
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