Eberhard Bodenschatz How Can the Statistical Properties of a Turbulent Flow Be Calculated?
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For more than one hundred years, scientists have been working to uncover how turbulent flows occur. This would enable them among other things to predict how pollutants spread in water or how pollen travel in air. As EBERHARD BODENSCHATZ explains in this video, new insights are offered by an approach based on Lagrangian Particle Tracking Technique: The researchers focused on a single particle in a fluid and followed it through the flow, using tracers both numerically and experimentally. By tracking more than three thousand particles at a given time, the researchers derived statistics of the particle motion in the flow. In this way, they are able to predict turbulences in the flow and prove that these turbulences are irreversible. This irreversibility, in turn, shows that vortex stretching is really at the basis of a turbulent flow.
LT Video Publication DOI: https://doi.org/10.21036/LTPUB10273
Lagrangian View of Time Irreversibility of Fluid Turbulence
- Haitao Xu, Alain Pumir and Eberhard Bodenschatz
- Science China Physics, Mechanics & Astronomy
- Published in 2016