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Session: PIV/PTV methods and applications I
Session starts: Wednesday 05 November, 10:20
Presentation starts: 11:00
Room: Lecture room B

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Abel George (Indian Institute of Science, Bangalore, India)
Sumit Tambe (Indian Institute of Science, Bangalore, India)

Abstract:
This work aims to study the instability and turbulence onset mechanism in rotating cone boundary layers by focusing on the coherent vortex structures that form close to the cone surface. Time-resolved 2C PIV and dye visualisation are used to study the instability-induced coherent vortices on a cone rotating in still water. The cone half angle is 30 degrees, which is known to induce both co-rotating and counter-rotating vortices, suggesting a mixed presence of cross-flow and centrifugal instabilities, respectively. The Finite-Time Lyapunov Exponent (FTLE) field, which quantifies the rate of separation of nearby fluid particles over a finite time, was computed to identify Lagrangian Coherent Structures (LCS). These structures are used to track the transport of coherent vortices in the flow. The preliminary results presented. The results are scaled using the G¨ortler Number along the cone surface and the diffusion length scale perpendicular to it.