Results 1 
2 of
2
Large Eddy Simulation of the GasLiquid Flow in a Square Crosssectioned Bubble
, 2001
"... In this work the use of large eddy simulations (LES) in numerical simulations of the gasliquid flow in bubble columns is studied. The EulerEuler approach is used to describe the equations of motion of the twophase flow. It is found that, when the drag, lift and virtual mass forces are used, th ..."
Abstract

Cited by 15 (4 self)
 Add to MetaCart
In this work the use of large eddy simulations (LES) in numerical simulations of the gasliquid flow in bubble columns is studied. The EulerEuler approach is used to describe the equations of motion of the twophase flow. It is found that, when the drag, lift and virtual mass forces are used, the transient behaviour that was observed in experiments can be captured. Good quantitative agreement with experimental data is obtained both for the mean velocities and the fluctuating velocities. The LES shows better agreement with the experimental data than simulations using the kepsilon model.
A Numerical Scheme for Euler–Lagrange Simulation of Bubbly Flows
 in Complex Systems,” International Journal for Numerical Methods in Fluids
, 2011
"... An EulerianLagrangian approach is developed for the simulation of turbulent bubbly flows in complex systems. The liquid phase is treated as a continuum and the NavierStokes equations are solved in an unstructured grid, finite volume framework for turbulent flows. The dynamics of the disperse phase ..."
Abstract

Cited by 5 (0 self)
 Add to MetaCart
(Show Context)
An EulerianLagrangian approach is developed for the simulation of turbulent bubbly flows in complex systems. The liquid phase is treated as a continuum and the NavierStokes equations are solved in an unstructured grid, finite volume framework for turbulent flows. The dynamics of the disperse phase is modeled in a Lagrangian frame and includes models for motion of each individual bubble, bubble size variations due to the local pressure changes, and interactions among the bubbles and with boundaries. The bubble growth/collapse is modeled by the RayleighPlesset (RP) equation. Three modeling approaches are considered: (a) oneway coupling; where the influence of the bubble on the fluid flow is neglected, (b) twoway coupling; where the momentum exchange between the fluid and the bubbles is modeled, and (c) volumetric coupling; where the volumetric displacement of the fluid by the bubble motion and the momentumexchange are modeled. A novel adaptive timestepping scheme based on stability analysis of the nonlinear bubble dynamics equations is developed. The numerical approach is verified for various single bubble test cases to show secondorder accuracy. Interactions of multiple bubbles with vortical flows are simulated to study the effectiveness of the volumetric coupling approach in predicting the flow features observed experimentally. Finally, the numerical approach is used to perform a largeeddy simulation in two configurations: (i) flow over a cavity to