قالب وردپرس درنا توس
Home / Science / Research shows that jellyfish creates “virtual walls” to enhance performance

Research shows that jellyfish creates “virtual walls” to enhance performance



Research shows that jellyfish creates

Image captured in a glass film container.Image source: University of South Florida

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.”

; Brad Gemmell, associate professor of integrated biology, discovered that jellyfish produce two vortex rings, which are donut-like fluids beneath a translucent object that rotate in opposite directions. They behave as jellyfish being squeezed and reopened during each swimming cycle, thus providing a “ground effect” force as if they were about to be pushed off the ocean floor.

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.







The high-speed camera captures swimming jellyfish through a laser sheet with tracking particles.Image source: University of South Florida

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.

Research shows that jellyfish creates

The anatomical characteristics of the jellyfish and the vortex arrangement of the lunar jellyfish in the swimming cycle.Image source: University of South Florida

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)


More information:
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

This document is protected by copyright. Except for any fair transactions for private learning or research purposes, no content may be copied without written permission. The content is for reference only.




Source link