Effect of local flow geometry on particle pair dispersion angle

Understanding how turbulent flows disperse particles is essential both for unraveling fundamental aspects of turbulence and for their environmental and industrial implications. Using experiments and numerical simulations, we show that the local flow geometry, especially around stagnation points, significantly affects particle-pair dispersion. By examining the angle between particle-pair displacement and their relative velocity, we characterize dispersion and show that flow anisotropies alter dispersion behavior beyond classical predictions based on homogeneous isotropic turbulence.