Characterizing Lagrangian particle dynamics in decaying homogeneous isotropic turbulence using proper orthogonal decomposition

Particle proper orthogonal decomposition (PPOD) is demonstrated as a method for extraction of temporal statistical information on dispersed (discrete) phases multiphase flows. PPOD an extension the classical Eulerian POD, differentiating itself by its Lagrangian formulation and applicability to discrete in both stationary non-stationary The test case decaying homogeneous isotropic turbulence, where particle data are generated one-way coupled simulations. Here, positions velocities integrated forward time manner. results demonstrate proof concept PPOD, potential applicability. It that modes able capture large scale flow features well smaller variations. Additionally, trajectories/velocities approximated using subset basis convergence demonstrated. In application multiple realizations, increase rate observed initial separation decreased. When decomposing solid (rigid) fluid velocities, provides possibility modal analysis fluid–particle interactions For various configurations rigid densities, parallelity between two mapped, revealing higher when particles neutrally buoyant.