Lagrangian acceleration in Rayleigh-Bénard convection at various aspect ratios

Abstract

Lagrangian dynamics of turbulent Rayleigh-B\'enard convection is studied experimentally with 3D particle tracking velocimetry at various aspect ratios $G$. Insight on the pair dispersion, conditional acceleration probability density functions, and roll dynamics induced by $G$ was found from nearly $3.5\ifmmode\times\else\texttimes\fi{}{10}^{7}$ events.