CFD simulations of an isolated cycling spoked wheel: Impact of the ground and wheel/ground contact modeling
CFD simulations of an isolated cycling spoked wheel: Impact of the ground and wheel/ground contact modeling
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DOI：
10.1016/j.euromechflu.2020.02.002
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发表时间：
2020-07-01
影响因子：
2.6
通讯作者：
Blocken, Bert
中科院分区：
文献类型：
--
作者：
Malizia, Fabio;Blocken, Bert
轮毂是公路自行车比赛中最常用的轮型，其气动性能的优化对自行车运动员的成绩至关重要。一般通过风洞试验或孤立车轮的CFD模拟来分析车轮的气动性能。在CFD模拟中，有大量的选项来模拟车轮/地面接触，包括不同的轮胎和地面之间的间隙以及不同高度的固体接触贴片(STEP)。然而，目前尚不清楚这些建模选项对CFD结果的影响程度。本文系统地分析了这些方案对孤立轮距车轮计算的力和力矩的影响，并阐明了在零偏航条件下轮子周围的流动行为。与不考虑地面的情况相比，有间隙或有台阶的情况下车轮阻力系数分别降低1.0%和1.8%左右，而所有车轮/地面接触建模方法的转动力矩都比没有地面的情况低约2.0%。间隙间隙(
Spoked wheels are the most frequently used wheel type in road cycling competitions and their aerodynamic optimization is crucial for cyclist performance. The aerodynamic performance of wheels is generally analyzed by wind tunnel tests or CFD simulations for isolated wheels. There is a large number of options to model the wheel/ground contact in CFD simulations, including different clearances between tire and ground and different heights of solid contact patches (step). However, it is unclear to what extent these modeling options influence the CFD results. The present paper systematically analyzes the impact of these options on the computed forces and moments of an isolated cycling spoked wheel and elucidates the flow behavior around this wheel for zero yaw conditions. The wheel drag coefficient for the cases where the ground is included in the simulations using a clearance or a step is 1.0% and about 1.8% lower compared to the case without ground, respectively, whereas the rotational moment is about 2.0% lower for all the wheel/ground contact modeling approaches compared to the case without ground. The gap clearance (