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15:30
15 mins
Direction change of fluid particles in confined two-dimensional turbulence
Benjamin Kadoch, Wouter Bos, Kai Schneider
Session: Lagrangian aspects of turbulence 3
Session starts: Thursday 27 August, 15:00
Presentation starts: 15:30
Room: Room F
Benjamin Kadoch (AMU/IUSTI)
Wouter Bos (LMFA /CNRS/ Ecole Centrale Lyon)
Kai Schneider (AMU/M2P2)
Abstract:
The directional change of a fluid particle can be measured by the angle between two subsequent particle displacement increments. At small values of the time-increment the so-defined angle is proportional to the curvature of the trajectory. At large values this coarse-grained curvature should be affected by the presence of solid no-slip walls around the flow domain. We compare homogeneous and confined two-dimensional turbulent flows and show that the PDF of the angle is indeed strongly modified by the presence of walls.