# Statistics of Lagrangian Trajectories in a Rotating Turbulent Flow

## TL;DR

This study uses direct numerical simulations to analyze how rotation influences the Lagrangian statistics of turbulent flows, revealing that rotation suppresses certain flow events and affects flow irreversibility measures.

## Contribution

It demonstrates how rotation-induced coherent structures alter Lagrangian flow statistics and explains the failure of irreversibility measures in rotating turbulence.

## Key findings

- Rotation suppresses 'flight-crash' events in turbulence.
- Coherent vortical structures emerge due to Coriolis force.
- Lagrangian irreversibility measures may fail in rotating flows.

## Abstract

We investigate the Lagrangian statistics of three-dimensional rotating turbulent flows through direct numerical simulations. We find that the emergence of coherent vortical structures because of the Coriolis force leads to a suppression of the "flight-crash" events reported by Xu, et al. [Proc. Natl. Acad. Sci. (U.S.A) 111, 7558 (2014)]. We perform systematic studies to trace the origins of this suppression in the emergent geometry of the flow and show why such a Lagrangian measure of irreversibility may fail in the presence of rotation.