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Particle-or droplet-laden turbulent flows play a role in many industrial and environmental applications like spray combustion or cloud formation. For numerical simulations of such flows, RANS-based simulation models are applicable. In this work [7], we outline a new model that accurately reproduces particle-induced attenuation of fluid-phase turbulence. The new model is based on a Lagrangian description for the particle-phase, which provides a closure model for particle-phase terms in the fluid-phase RANS and Reynolds stress equations. Moreover, it accounts for preferential concentration effects that become important for Stokes numbers around 1. The model performance is validated for a range of different particle Stokes numbers and particle mass loadings.
Author(s):
Daniel Meyer
Institute of Fluid Dynamics, ETH Zurich
Switzerland