Assessment of numerical methods for fully resolved simulations of particle-laden turbulent flows

This work was granted access to the HPC resources of CALMIP and the National Center for Atmospheric Researchs (NCAR) supercomputing centers. P. Costa acknowledges the funding from the Portuguese Foundation for Science and Technology under grant no. SFRH/BD/85501/2012. L.-P. Wang acknowledges the funding from the U.S. National Science Foundation (NSF) under grants CBET-1706130.Peer reviewedPostprin

Multiscale approach for liquid-gas flow to link homogeneous and separated multiphase flows

International audienc

Multiscale approach for liquid-gas flow to link homogeneous and separated multiphase flows

International audienc

Simulation of fully resolved finite-size particles in a turbulent flow

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Direct Numerical Simulation of Particle Turbulence Interaction in Forced Turbulence

International audienceUsually, numerical simulations of two-phase particle dispersed flow both with Eulerian or Lagrangian approaches assume particle size to be smaller than the smallest scales of the carrier fluid, which is not the case for most two-phase dispersed flows. The present work aims at giving a detailed analysis of particle behaviour by performing fully resolved of finite size particle simulations in the case of forced homogeneous isotropic turbulenc

Analysis of unsteady Lagrangian and Eulerian characteristics of a liquid fluidized bed by Direct Numerical Simulation

The characterization of fluidized beds is still a challenging task for macroscopic modeling issues and industrial applications. The macroscopic models require to be fed with parameters or laws that are not well understood or even impossible to estimate as soon as the solid fraction is larger than 0.1. The aim of the present work is to investigate Direct Numerical Simulation [1] of unsteady particle flows in order to solve all the time and space scale of the flow and the particle and to allow for the estimate of unknown macroscopic or stochastic characteristics of the flow. In the DNS, the particles are fully resolved, i.e. the particle diameter is larger than the grid size and to the smallest hydrodynamic scale. A benchmark experimental fluidized bed [2] is simulated and analyzed in terms of macroscopic and Lagrangian characteristics. Comparisons of numerical solutions to measurements are achieved with success

Analysis of unsteady Lagrangian and Eulerian characteristics of a liquid fluidized bed by direct numerical simulation

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Fully Resolved Direct Numerical Simulation of a Liquid Fluidized Bed

International audienc

Numerical modelling of finite-size particle collisions in a viscous fluid

A general model is presented for short-range hydrodynamic interactions and head-on particle-particle/wall collisions. The model has been embedded in two distinct numerical methods for fully resolved simulation of finite-size particles in a viscous fluid. It accounts for the material properties of the particles and lubrication effects prior to collision that cannot be fully resolved on a fixed grid. We demonstrate that the model is able to reproduce experimental data for the coefficient of restitution of particle-wall collisions over a wide range of Stokes number based on the particle impact velocity. The set of model parameters we selected and more generally the modelling approach we propose can be efficiently used for fully resolved simulations of moderately dense solid-liquid suspensions.Process and EnergyMechanical, Maritime and Materials Engineerin