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We report experimental measurements of the translational and rotationaldynamics of a large buoyant sphere in isotropic turbulence. We introduce anefficient method to simultaneously determine the position and (absolute)orientation of a spherical body from visual observation. The method employs aminimization algorithm to obtain the orientation from the 2D projection of aspecific pattern drawn onto the surface of the sphere. This has the advantagesthat it does not require a database of reference images, is easily scalableusing parallel processing, and enables accurate absolute orientation reference.Analysis of the sphere's translational dynamics reveals clear differencesbetween the streamwise and transverse directions. The translationalauto-correlations and PDFs provide evidence for periodicity in the particle'sdynamics even under turbulent conditions. The angular autocorrelations showweak periodicity. The angular accelerations exhibit wide tails, however withouta directional dependence.

Translational and rotational dynamics of a large buoyant sphere in turbulence