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Taking a leading position in a group of fast-pedaling bicyclists is not easy, you have to overcome greater resistance than your followers. Same for racing cars and queuing lobsters moving underwater. This is the so-called hydrodynamical drafting or aerodynamical drafting effect. Such effect has been tested over and over with different shapes and over many flow conditions in laboratory experiments. The most representative tests are the ones that dealt with rigid cylinders in a moving fluid. The cylinder that first encounters the fluid always experience more drag compared to its follower. Zhang Lab Zhang Lab
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