Creation of an isolated turbulent blob fed by vortex rings, Mr. Takumi Matsuzawa, The University of Chicago

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Date: Thursday, December 8, 2022

Time: 15:30-16:30 

Location: Lab4, L4E45 or Zoom

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Speaker: Mr. Takumi Matsuzawa, The University of Chicago

Title: Creation of an isolated turbulent blob fed by vortex rings

Abstract: 

Turbulence is hard to control. A plethora of experimental methods have been developed to study its statistical and structural features as well as its onset. In all cases, however, the central role played by the material boundaries of the apparatus poses a challenge on understanding what the turbulence has been fed, and how it would freely evolve. Here, we build and control a confined state of turbulence using only elemental building blocks: vortex rings. We have discovered that a collection of vortex rings periodically fired together leads to a self-confining turbulent blob. With PIV and 3D PTV, we assemble a full picture of its three-dimensional structure, onset, energy budget and tunability. Crucially, the injected vortex rings can be endowed with conserved quantities such as helicity, which enables us to inject them to turbulence with arbitrary ratios. Our 'one eddy at a time' approach paves the way to position, localize and control turbulence as a state of matter. 

If you would prefer to join over Zoom:

https://oist.zoom.us/j/96616913024?pwd=eHM4ME1uc2NtVTFJQnA0QWdyd1BCdz09

Meeting ID: 966 1691 3024

Passcode: 296722