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Home NEWS Science News Biology

Researchers rank ‘smartest’ schools of fish when it comes to travel formations

Bioengineer by Bioengineer
January 29, 2020
in Biology
Reading Time: 3 mins read
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Credit: NJIT


The concert of motion that fish schools are famous for isn’t merely an elaborate display of synchronized swimming. Their seemingly telepathic collective movement is part of a time-tested strategy for improving the group’s chances for survival as a whole, from defense against predators to food-finding and mating.

A study published in Physical Review X is offering new details that show how the aquatic flows created by certain schools of fish can benefit each of its individual members in yet another way — hydrodynamically.

A research team from New Jersey Institute of Technology (NJIT) and New York University (NYU) has showcased a new mathematical model capable of determining what formations give a school’s swimmers the biggest advantage when it comes to energy efficiency and speeds, particularly when compared to school-less fishes.

The researchers say the study offers a physical picture that illustrates how swimmers in fish schools are influenced through the constant connection between each swimmer’s flapping wings and the persistent flow vortices generated by the collective.

“There is a lot of scientific literature that has focused on the dynamics of fish schools and social interactions that shape them, such as the need to take up formations for predator avoidance for instance,” said Anand Oza, assistant professor at NJIT’s Department of Mathematics and one of the study’s authors. “Often neglected, however, has been fluid dynamics … ‘can fluid flows actually influence the structure of schools?’. What I find exciting is that with this study we can now quantitatively point to how hydrodynamics can help or even hinder a school.”

The team examined four common fish school formation types in motion: in-line formations, single-file “phalanx” formations, rectangular “lattice” formations; and diamond lattice formations.

By applying experimental data from previous studies conducted at NYU to their model, the team captured a range of subtle hydrodynamic interactions that occur within various fish schools, showing how much energy was exerted by each fish from their flapping movements as they swam within their formation. The team’s model also kept track of the forces due to small whirlpool-like vortices the swimmers shed with every stroke, showing how much the fishes were propelled along by vortex flows generated by their schoolmates.

Overall, the team’s computer simulations revealed that schools formed in a single-line across (phalanx) received marginal speed and energy savings over solitary swimmers, while in-line and rectangular lattice formations offered substantial improvements. However, the team observed that fish organized in a diamond lattice formation received the greatest hydrodynamic advantage.

“Finding that the diamond formation is best was not altogether surprising, but what we learned is that all diamonds are not equal … the geometry does matter. Generally, the thinner the diamond formation, the better the performance,” explained Oza.

Oza now says their team hopes to develop their model further to study similar dynamics in bird flocks. The results could have engineering applications in energy harvesting and propulsion, perhaps in ways that may be useful for developing more efficient wind farms.

“We need to further validate our model and conduct more tests, but ideally I could see conceptually similar models used to help determine how to arrange wind turbines together to get the best output of energy,” said Oza. “We’d also like to use this model to look how vortices and fluid-mediated memory can influence the collective behavior of densely packed or disordered schools and flocks. That is an exciting look forward that hasn’t been explored a lot.”

###

About New Jersey Institute of Technology:

One of only 32 polytechnic universities in the United States, New Jersey Institute of Technology (NJIT) prepares students to become leaders in the technology-dependent economy of the 21st century. NJIT’s multidisciplinary curriculum and computing-intensive approach to education provide technological proficiency, business acumen and leadership skills. NJIT is rated an “R1” research university by the Carnegie Classification®, which indicates the highest level of research activity. NJIT conducts approximately $170 million in research activity each year and has a $2.8 billion annual economic impact on the State of New Jersey. NJIT is ranked #1 nationally by Forbes for the upward economic mobility of its lowest-income students and is ranked 53rd out of more than 4,000 colleges and universities for the mid-career earnings of graduates, according to PayScale.com. NJIT also is ranked by U.S. News & World Report as one of the top 100 national universities.

Media Contact
Tanya Klein
[email protected]
973-596-3433

Original Source

https://news.njit.edu/researchers-rank-smartest-schools-fish-when-it-comes-travel-formations

Related Journal Article

http://dx.doi.org/10.1103/PhysRevX.9.041024

Tags: Algorithms/ModelsBioinformaticsBiologyBiomechanics/BiophysicsMarine/Freshwater BiologyMathematics/StatisticsOceanographyZoology/Veterinary Science
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