this post was submitted on 06 Jan 2024
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This is a guess but the fluid dynamics likely changes? As the size of the group increases the Reynolds number probably increases making inertia a significant factor.
Individual human runners in air is maybe a bad analogy think more like honey where every stroke pushes you back as much as it pushes you forward.
This article might interest you https://doi.org/10.1529%2Fbiophysj.107.118257