Some phenomenon has confused scientists for nearly two centuries. Lonely waves, strangely tall and fast, moving around the ebb and flow around them.
The urgent reason to understand this wave recently became clear when a huge tsunami killed more than 250,000 people in southern Asia in 2004 and 20,000 people died in Japan in 2011.
Georgios Vatistas, professor of mechanical engineering at Concordia's Gina Cody in the Department of Engineering and Computer Science, has been deciphering these creative waves for decades and trying to predict their movements. His latest research published in this month's journal Physical Review EI pushed the field forward by observing how the waves occurred in the series.
The Vatistas study suggests that we learn a lot from the "collective" of solitary waves. They organize themselves in an exciting way that moves in unexpected harmony.
His lab team voluntarily recorded simultaneous waves. They traveled at the same speed and symmetrically placed everything evenly.
The observer will see them and think of dancing, Batistas says.
"We know how a cluster works, and now how do we use it as an engineer in our lives?"
Examples through nature
The waves like tsunami happen to the sea and beyond. This phenomenon occurs throughout nature and technology: electrical circuits, acoustic waves, atmospheres around the North and South Pole, plasma fluids, fiber optics, DNA movement, and even quantum theory.
The more Vatistas learn about their unique movements, the more attractive they become.
"For example, if you have two solitary waves traveling toward each other, you can cross each other without being affected," explains Vatistas. The simulation showed that the waves would collide and continue.
More dramatically, Tsunami tours can travel much faster and faster than Boeing 747 jumbo jets.
A more interesting pattern appears when waves are created in the lab.
Vatistas uses a cylindrical tank made of Plexiglas, and the outlet on one end is covered with a cork. Tanks can be filled and manipulated with water, and movement of the water is captured by the camera.
In the past, Vatistas showed that waves form in the empty space in the center created by centrifugal force. A triangle surrounded by a wall of water appears, with squares, pentagons, and hexagons.
In 1990 Vatistas created the first Wave to be rotated. Wave does not need to track progress because it's easy to study when you circle or rotate instead of moving in a linear direction.
The Vatistas research team consists of Hamid Ait Abderrahmane of Khalifa University of Abu Dhabi, Concordia engineering professor of Hoi Dick Ng and graduate student Pooya Soltanian Sedeh. In this study they created a series of waves. Their record is 13 in the same orbit.
After a surprisingly coordinated "dancing", the team watched as all the waves gathered from the same location and watched at the same time, trying to meter more accurately at the same time.
In recent years, in addition to trying to predict the tsunami more precisely in Japan, especially after 2011, Batistas has also learned how researchers from other disciplines have translated and added their research results.
The new paper will be particularly interesting for mathematicians, he says. The velocity of the waves was not expected and suggests that they can not be fully modeled into the existing formula for predicting motion called the Korteweg-de Vries model. New maths must be found to explain them.
"You have to understand it and take advantage of it," he says.
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Hamid Ait Abderrahmane et al. A rotating polygonal recessed soliton cluster on the inner surface of the liquid ring, Physical Review E (2019). DOI: 10.1103 / PhysRevE.99.023110
New research will help decipher the movement pattern of lonely waves like tsunami (April 17, 2019).
April 17, 2019 Search
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