Supercomputer Simulations Show How Dolphin Tail Kicks Build Thrust‑Driving Vortex Hierarchy
Study shows dolphin tail kicks create large vortex rings that produce most thrust, with smaller vortices adding little push.
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TL;DR
Using supercomputer simulations, researchers at Osaka University revealed that dolphin tail kicks first generate large vortex rings that produce most of the thrust, which then spawn many smaller vortices that add little forward push.
Dolphins swim fast, but the exact flow mechanics behind their propulsion have remained unclear. A team from Osaka University published their findings in *Physical Review Fluids* after running multiple high‑resolution simulations of dolphin tail movements.
The simulations showed that each kick creates one primary vortex ring followed by dozens of smaller eddies per cycle. Co‑author Susumu Goto noted, "Understanding the hierarchy of vortices in turbulence is key to explaining dolphin swimming," adding that the largest vortices are responsible for most propulsion while the smaller ones are mainly byproducts of turbulent flow.
This vortex hierarchy means that the bulk of thrust comes from the first, large ring, with the secondary vortices contributing less than 15 % of the forward force. Insights from the study could guide the design of more efficient underwater robots that replicate this flow‑control strategy.
Next, engineers will test whether mimicking this vortex hierarchy can improve the efficiency of underwater drones.
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