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Illustration of the principles of SWUM: (a) analytical model of swimming human; (b) an example of body geometry (male, 20–29 years); (c) fluid forces except buoyancy; (d) buoyancy is calculated by integrating pressure force on divided quadrangles; (e) divided elliptic plate; and (f) judgement whether quadrangles submerge or not (Nakashima et al., 2007).
