Statistics of particle dispersion in Direct Numerical Simulations of wall-bounded turbulence: results of an international collaborative benchmark test

TL;DR

This paper presents an international benchmark test for particle dispersion in wall-bounded turbulence using DNS and Lagrangian tracking, providing a comprehensive dataset and comparing different numerical approaches.

Contribution

It establishes a standardized, publicly available database for turbulent particle dispersion, comparing multiple numerical methods in a low Reynolds number channel flow.

Findings

Velocity statistics for fluid and particles analyzed

Particle distribution statistics benchmarked across methods

Data available for further research and validation

Abstract

In this paper, the results of an international collaborative test case relative to the production of a Direct Numerical Simulation and Lagrangian Particle Tracking database for turbulent particle dispersion in channel flow at low Reynolds number are presented. The objective of this test case is to establish a homogeneous source of data relevant to the general problem of particle dispersion in wall-bounded turbulence. Different numerical approaches and computational codes have been used to simulate the particle-laden flow and calculations have been carried on long enough to achieve a statistically-steady condition for particle distribution. In such stationary regime, a comprehensive database including both post-processed statistics and raw data for the fluid and for the particles has been obtained. The complete datasets can be downloaded from the web at http://cfd.cineca.it/cfd/repository/. In this paper, the most relevant velocity statistics (for both phases) and particle distribution statistics are discussed and benchmarked by direct comparison between the different numerical predictions.