2013/01/07 by Guido Boffetta, Massimo Cencini, Boffetta, Guido +5
Physics and Astronomy · #Chaotic Dynamics (nlin.CD) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #nlin.CD #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.1301.1201
14 pages, 6 figures
arxiv created 2013/05/13 · arxiv updated 2013/05/14
We investigate the statistics of orientation of small, neutrally buoyant, spherical tracers whose center of mass is displaced from the geometrical center. If appropriate-sized particles are considered, a linear relation can be derived between the horizontal components of the orientation vector and the same components of acceleration. Direct numerical simulations are carried out, showing that such relation can be used to reconstruct the statistics of acceleration fluctuations up to the order of the gravitational acceleration. Based on such results, we suggest a novel method for the local experimental measurement of accelerations in turbulent flows.