Long-time Solids Suspension Simulations by Means of a Large-Eddy Approach

Quantifying sub-grid scale (SGS) turbulent dispersion force and its effect using one-equation SGS large eddy simulation (LES) model in a gas–liquid and a liquid–liquid system

“…The Eulerian-Eulerian large eddy simulation (LES) turbulence model has shown significant promise in unearthing flow details in multiphase systems like, in gas-liquid multiphase systems (Deen et al, 2001;Dhotre et al, 2008;Tabib et al, 2008;Zhang et al, 2008;Niceno et al, 2008), in liquid-solid particle systems involving stirred vessel (Derksen, 2006), in fluidized bed (Chiesa et al, 2005) and particle laden flow (Riber et al, 2009). Though there is one drawback while applying the Eulerian-Eulerian LES, that is in-order to maintain the consistency of the assumption of interpenetrating continua, the largest interface details should be smaller than the grid size, which means that the cell size must be larger than the particle size.…”

Models and Applications for Simulating Turbulent Solid–Liquid Suspensions in Stirred Tanks

“…An E-L approach with LES for the continuous phase can be adopted for processes that span many integral time scales by using previously stored flow time series (Derksen, 2006). The results obtained using this approach highlighted the importance of SGS motions and models given that the steady-state particle concentration profiles were sensitive to the SGS fluctuation levels.…”

Particle image velocimetry experiments and direct numerical simulations of solids suspension in transitional stirred tank flow

“…This trend is facilitated by the increasing availability of computational resources as well as developments in numerical methods. Nowadays Eulerian-Lagrangian simulations are feasible with millions of point particles being tracked through the liquid phase (Derksen, 2006(Derksen, , 2009(Derksen, , 2018, thereby revealing extensive detail of liquid and solids dynamics as well as the possibility to record the history of exposure to flows and scalar concentrations of individual particles (Derksen, 2014b). In simulations with even finer resolution, the flow around individual particles is resolved.…”