Tracking the dynamics of translation and absolute orientation of a sphere in a turbulent flow

Details Tracking the dynamics of translation and absolute orientation of a sphere in a turbulent flow Tracking the dynamics of translation and absolute orientation of a sphere in a turbulent flow

2010-10-17

arxiv.org/abs/1010.3422v1

Physics

Fluid Dynamics

Scientific paper

We study the 6-dimensional dynamics -- position and orientation -- of a large sphere advected by a turbulent flow. The movement of the sphere is recorded with 2 high-speed cameras. Its orientation is tracked using a novel, efficient algorithm; it is based on the identification of possible orientation `candidates' at each time step, with the dynamics later obtained from maximization of a likelihood function. Analysis of the resulting linear and angular velocities and accelerations reveal a surprising intermittency for an object whose size lies in the integral range, close to the integral scale of the underlying turbulent flow.

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