Steady wave interference between human swimmers

This study focuses on the hydrodynamic interaction between two or three human swimmers in competitive swimming. Although the swimming performance of a single swimmer has been widely examined, the studies on the interaction between multiple competitive swimmers are very rare [1]. Experiments showed evidence that the drag of a swimmer couldbe modified by the existence of the other adjacent competitors [2]. The questions arise: 1) what mechanism determines the interaction; 2) which position experiences drag reduction or drag increase; 3) how much can drag be reduced or increased in a formation. According to the authors' knowledge, such questions have not been addressed by any published literature.