A new study led by the University of South Florida reveals one of the reasons why jellyfish are called “the most efficient swimmer in the world.”
On airport runways, “ground effect” is the most widely understood. During takeoff, air is squeezed between the aircraft and the ground, which creates pressure and generates power, thereby improving performance. Gemmell’s experiments show that jellyfish can use their two vortex rings to replace the ground. The vortex rings resist each other and form a “virtual wall” that provides similar performance improvements compared to animals swimming near the bottom. No one has ever proved that animals can produce this phenomenon beyond solid boundaries.
“These simple animals have figured out how to achieve “ground effect” type enhancements on open water, away from any solid surface. This fact may open up a series of new possibilities for construction vehicles to use this phenomenon.” , Gemmell said.
In published research Proceedings of the Royal Society B, Gemmell captured the movement by using a high-speed digital camera to record the movement of eight jellyfish swimming in a glass shooting container at 1,000 frames per second. He and his colleagues have witnessed a 41% increase in the maximum swimming speed of the jellyfish in motion compared with the jellyfish starting at rest, and a 61% increase in the cumulative travel distance per swimming cycle.
Unlike the motion of a propeller, jellyfish do not produce cavitation bubbles and remain silent, allowing them to move quietly in the water. The high efficiency of swimming also helps them store energy for growth and reproduction. Several research groups use jellyfish as a model for developing underwater vehicles that can be equipped with sensors that monitor the ocean without interference. These new discoveries may enhance the development of these technologies and further understand the ocean.
Scientists have discovered the secret of efficient swimming in certain animals (such as jellyfish)
Brad J. Gemmell et al. The most efficient epigenetic swimmers create “virtual walls” to enhance performance. Proceedings of the Royal Society B. Release time: January 6, 2021 doi.org/10.1098/rspb.2020.2494
Provided by the University of South Florida
Citation: Research shows that the jellyfish created a “virtual wall” to enhance performance (January 8, 2021). The jellyfish was released from https://phys.org/news/2021-01-reveals-jellyfish on January 9, 2021 -virtual-wall.html search
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