## 5 Analysis and Discussion of Influence of Wind Resistance on Athletes
### Optimization of Athletes' Sliding Routes  
Due to different climatic conditions, winds of different speeds will form on the track of the NSC, resulting in different headwind air resistance for athletes sliding at different lateral positions on the track. In order to reduce the impact of the wind field distribution on the athletes' performance, this study uses the following method to optimize the sliding route of athletes at the NSC:  
Based on the numerical simulation results of CFD under different climatic conditions, the relative values of the normal average headwind resistance \(F^{b,d}_{a-CL}\), \(F^{b,d}_{a-CM}\), and \(F^{b,d}_{a-CR}\) on the left, middle, and right sides of each athlete's human body model at 0.2 m in front of the athlete is calculated. Let the athlete choose the side with the smallest value among \(F^{b,d}_{a-CL}\), \(F^{b,d}_{a-CM}\), and \(F^{b,d}_{a-CR}\) to slide, so as to optimize the sliding route of athletes in the NSC under different climatic conditions.  
Among them, under the average winter climate conditions in Yanqing, \(F^{b,1}_{a-CL}\), \(F^{b,1}_{a-CM}\), and \(F^{b,1}_{a-CR}\), are as shown in Appendix A (Figures A1-A3). According to the method of optimizing the sliding route, the optimized sliding route for athletes under different wind directions under the average winter climate conditions in Yanqing District is obtained, as  
Figure 11: Fitting curve diagram of AWREJ under different climate conditions.  
Figure 12: Comparative analysis of wind resistance under different climate conditions.  
shown in Appendix A (Table A1). Based on the optimized sliding route, the optimized sliding route map is completed, as shown in Appendix A (Figures A4-A6).  
Formula (19) is used to calculate the AWRDU under the average winter climate conditions. The results are shown as follows: J\({}^{1,1}\) = 0.2274 N; J\({}^{2,1}\) = 0.1962 N; J\({}^{3,1}\) = 0.3586 N; \(\left({{{1}^{1,1}}+{{1}^{2,1}}+{{1}^{3,1}}}\right)/3=0.2607\) N.  
When the outdoor wind level is \(d\), optimizing the routes of the athletes sliding in the NSC can reduce the air resistance by an average of 0.2607 N. According to [PERSON]'s second law (\(F=ma\)), an air resistance of 0.2607 N can cause an acceleration change of 0.0034 m/s\({}^{2}\) for an athlete weighing 77 kg. Thus, it can be seen that the optimization of the athlete's sliding route can directly affect the athlete's sliding competition results. It is very necessary to optimize the sliding route of the sliding athlete.  
Therefore, according to the long-term local meteorological observation data of Yanqing, it was found that the wind directions of the winter wind field are mainly WNW, NW, and NWN, and the wind speed usually varies from level 3 to level 8. To this end, we optimized and determined the corresponding sliding routes based on the calculated quantitative impact of wind resistance on athletes under different wind speed and wind direction conditions, as shown in Appendix A (Table A2).  
When athletes do not have knowledge of the weather conditions on the day of the competition, or the weather on the day of the competition is more complicated, the optimized sliding route for athletes under the average winter climate conditions can be used as a basic reference for athletes' competitions. Of course, if the climate conditions on the day of the competition are relatively stable or the wind force level is determined, athletes can refer to the optimized sliding route under different climate conditions.