Abstract
Concerning most of track-and-field athletics such as the marathon, it is important to elucidate the flow around track runners, and to evaluate their air resistances. In wind-tunnel experiments which are the most effective approach to such a study, the moving-belt system is indispensable for precise aerodynamic measurements considering the ground effect. Recently, the authors have developed the device, and show its basic performance such as the distributions of time-mean velocity and turbulent intensity above the moving-belt system using a hot-wire anemometer. In the present study, the authors reveal the air resistance of a runner in various tandem-running formations.
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