![\"\"](\"https:\/\/www.europesays.com\/ie\/wp-content\/uploads\/2026\/05\/why-dolphins-swim-so-f.jpg\" "\\"Scientists")
Hierarchy of vortices created by a swimming dolphin. Credit: Yutaro Motoori<\/p>\nResearchers from Osaka University have used supercomputer simulations to solve the mystery of how dolphins achieve such high speeds and agility.\u00a0The research team identified specific propulsion mechanisms by analyzing the complex, turbulent water patterns generated by a dolphin\u2019s tail. <\/p>\n
Interestingly, supercomputer simulations revealed that a dolphin\u2019s propulsion is driven by the formation of massive, powerful vortex rings.\u00a0<\/p>\n
\u201cOur goal is to understand which parts of the turbulent flow help dolphins swim so quickly. Using a supercomputer, we can simulate and decompose the flow to determine which components play dominant roles,\u201d said Yutaro Motoori, lead author.\u00a0<\/p>\n
Hierarchy of vortices created by a swimming dolphin. Credit: Yutaro Motoori<\/p>\n
How dolphins sculpt water to sprint<\/p>\n
Experts have long known that dolphins<\/a> are fast, but the specific source of their propulsion has been difficult to track.<\/p>\n For decades, \u201cGray\u2019s Paradox\u201d <\/a>suggested that dolphin muscles were mathematically incapable of overcoming water resistance, leading to the incorrect theory that their skin possessed unique anti-drag properties. This study finally resolves the paradox by demonstrating that the secret lies in fluid dynamics rather than in biology alone. <\/p>\n Dolphins propel themselves by oscillating their tails in a powerful vertical kicking motion, which drives water backward and creates a wake of complex, turbulent currents. This movement generates a \u201chierarchy of vortices\u201d\u2014a mixture of large, energy-rich swirls and smaller, chaotic ripples.\u00a0<\/p>\n The sheer complexity of these overlapping water patterns made it nearly impossible for scientists to pinpoint which specific part of the flow was responsible for the dolphin\u2019s legendary speed.<\/a><\/p>\n It turns out, it was hidden within the complex, bubbling turbulence generated by their powerful movements. Using large-scale numerical simulations, the Osaka team discovered that the dolphin\u2019s kick generates powerful, large-scale vortex rings.\u00a0The study reveals that only the largest of these vortices provides the actual thrust needed for speed.<\/p>\n \u201cThe numerical simulations revealed that the dolphin\u2019s oscillating tail produces strong, large-scale vortex rings that push water backward and generate thrust. Then, these large vortices create smaller ones in a process known as the energy cascade. Although these smaller vortices are numerous, they contribute little to the dolphin\u2019s forward motion,\u201d the researchers noted<\/a>.<\/p>\n Supercomputer power<\/p>\n Using high-powered simulations, the researchers achieved a level of detail in observing fluid motion that is virtually impossible to replicate in physical experiments. The flexibility of this digital approach enabled easy testing of various scenarios, confirming that the dolphin\u2019s propulsion mechanism remains remarkably consistent across swimming speeds.\u00a0<\/p>\n Notably, this computational study provided a clear, controlled view of complex physics that real-world trials simply couldn\u2019t capture.<\/p>\n