Flow visualisation of downhill skiers using the lattice Boltzmann method
Flow visualisation of downhill skiers using the lattice Boltzmann method
复制标题
使用格子玻尔兹曼方法对速降滑雪者的流动进行可视化
DOI:
10.1088/1361-6404/38/2/024002
复制
发表时间:
2017
影响因子:
0.7
通讯作者:
Sungchan Hong and Koichi Ijuin
中科院分区:
文献类型:
--
作者:
Takeshi Asai;Sungchan Hong and Koichi Ijuin
In downhill alpine skiing, skiers often exceed speeds of 120 km h− 1, with air resistance substantially affecting the overall race times. 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 and for the design of skiing equipment. However, these studies have not revealed the flow velocity distribution and vortex structure around the skier. In the present study, computational fluid dynamics are employed with the lattice Boltzmann method to derive the relationship between total drag and the flow velocity around a downhill skier in the full-tuck position. Furthermore, the flow around the downhill skier is visualised, and its vortex structure is examined. The results show that the total drag force in the downhill skier model is 27.0 N at a flow velocity of 15 ms− 1, increasing to 185.8 N at 40 ms− 1. From analysis of the drag distribution and the flow profile, the head, upper arms, lower legs, and thighs (including buttocks) are identified as the major sources of drag on a downhill skier. Based on these results, the design of suits and equipment for reducing the drag from each location should be the focus of research and development in ski equipment. This paper describes a pilot study that introduces undergraduate students of physics or engineering into this research field. The results of this study are easy to understand for undergraduate students.
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DOI:
10.2514/6.2011-869
发表时间:
2011
期刊:
--
影响因子:
--
作者:
E. Fares;S. Noelting
通讯作者:
S. Noelting
影响因子:
3.7
作者:
Timothy Crouch;D. Burton;Nicholas A. T. Brown;Mark C. Thompson;John Sheridan
通讯作者:
John Sheridan
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
B. Thompson;W. Friess;K. Knapp
通讯作者:
K. Knapp
DOI:
10.4271/2009-26-0057
发表时间:
2009
期刊:
--
影响因子:
--
作者:
R. Kotapati;A. Keating;S. Kandasamy;B. Duncan;R. Shock;Hudong Chen
通讯作者:
Hudong Chen
DOI:
10.1123/ijsb.3.4.345
发表时间:
1987-11-01
期刊:
INTERNATIONAL JOURNAL OF SPORT BIOMECHANICS
影响因子:
--
作者:
LUETHI, SM;DENOTH, J
通讯作者:
DENOTH, J