Application of POD-based dynamical systems to dispersion and deposition of particles in turbulent channel flow

Application of POD-based dynamical systems to dispersion and deposition of particles in turbulent... 1 Introduction</h5> Turbulent flows with the dispersed phase in the form of heavy particles (or droplets) have long been the subject of modeling efforts. Quite naturally, engineers have a keen interest in wall-bounded flows, the near-wall regions being of special importance due to the increased concentration of the dispersed phase, the deposition of particles on the wall and resuspension phenomena. Because of strong gradients and the presence of fine flow structures that directly affect the particulate phase, reliable modeling of the near-wall regions is crucial. However, the solution to full flow equations in the turbulent regime, or Direct Numerical Simulation (DNS), is often too costly even in a point-particle setting. Statistical approaches of the Reynolds-averaged Navier–Stokes (RANS) type involve major uncertainties since the entire fluctuating fields are modeled with one-point, gradient-type closures, and specific difficulties arise in wall-bounded flows (sweep/ejection events, etc.). Therefore, there is a need for simplified approaches that, on the one hand, can account for the dynamics of dominant vortical structures and, on the other hand, are numerically affordable. An important example is the large-eddy simulation (LES) method, which is being intensely developed nowadays and is increasingly applied for flows with a dispersed phase.</P>Here we http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Multiphase Flow Elsevier

Application of POD-based dynamical systems to dispersion and deposition of particles in turbulent channel flow

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Abstract

1 Introduction</h5> Turbulent flows with the dispersed phase in the form of heavy particles (or droplets) have long been the subject of modeling efforts. Quite naturally, engineers have a keen interest in wall-bounded flows, the near-wall regions being of special importance due to the increased concentration of the dispersed phase, the deposition of particles on the wall and resuspension phenomena. Because of strong gradients and the presence of fine flow structures that directly affect the particulate phase, reliable modeling of the near-wall regions is crucial. However, the solution to full flow equations in the turbulent regime, or Direct Numerical Simulation (DNS), is often too costly even in a point-particle setting. Statistical approaches of the Reynolds-averaged Navier–Stokes (RANS) type involve major uncertainties since the entire fluctuating fields are modeled with one-point, gradient-type closures, and specific difficulties arise in wall-bounded flows (sweep/ejection events, etc.). Therefore, there is a need for simplified approaches that, on the one hand, can account for the dynamics of dominant vortical structures and, on the other hand, are numerically affordable. An important example is the large-eddy simulation (LES) method, which is being intensely developed nowadays and is increasingly applied for flows with a dispersed phase.</P>Here we

Journal

International Journal of Multiphase FlowElsevier

Published: Jan 1, 2014

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