Proper orthogonal decomposition analysis of square lid driven cavity flows containing particle suspensions

TL;DR

This study uses proper orthogonal decomposition to analyze how particle suspensions affect flow stability and structures in a lid-driven cavity, revealing dominant flow features and critical regimes across various particle concentrations and Reynolds numbers.

Contribution

It introduces a POD-based analysis of particle-laden cavity flows, highlighting flow structure evolution and stability thresholds at different particle fractions and flow conditions.

Findings

Identification of dominant flow structures via POD

Flow stability varies with particle concentration and Reynolds number

Critical suspension fractions influence flow regime transitions

Abstract

Continual perturbations to the flow field in the square lid driven cavity can significantly impact both its stability and the dynamic characteristics of the system. In this study, the effect of these perturbations are analyzed via computational fluid dynamics simulations of a square, two-dimensional, lid driven cavity containing varying area fractions of suspended particles. The evolution over time of these particle-particle and particle-fluid interactions generate two-dimensional disturbance velocity changes in the flow field. In order to better understand the characteristics and effects of these changes, proper orthogonal decomposition analysis is performed on the velocity difference flow field to determine the dominant flow structures over the simulation time domain. The resulting eigenvectors and eigenvalues represent the varying dominant flow structures and their respective dominance over the simulation time, respectively. This is carried out at particle suspension area fractions from 10\% - 50\% and for Reynolds numbers of 100, 400, 700, and 1000. Critical flow regimes and particle suspension area fractions are discussed in order to characterize the stability of this particle-in-fluid system.