Parallel Computations of the Dynamic Behavior of Bubble Plumes

2003 ◽  
Author(s):  
Fabia´n A. Bombardelli ◽  
Gustavo C. Buscaglia ◽  
Marcelo H. Garci´a
Keyword(s):  
Dynamic Behavior ◽  
Fluid Model ◽  
Bubble Columns ◽  
Three Dimensions ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Parallel Code ◽  
Two Fluid Model ◽  
Model Equations ◽  
Two Fluid

This paper discusses numerical results obtained with different strategies for modeling air-water flows. Mathematical models for dilute mixtures, derived from the two-fluid model equations, are presented. These models include diverse degrees of complexity, and they handle turbulence via a k-ε model and a Large-Eddy Simulation (LES) approach, in a consistent way. The models are implemented in a parallel code, which is then used to numerically simulate the dynamic behavior of bubble columns in two and three dimensions. The results of the simulations are employed to study the interplay between the turbulence of the carrier and the scales of the wandering motion, and to compare the capability of different models to capture the physics behind the phenomenon.

Large Eddy Simulation of Gas - Second Order Moment of Particle Approach for Riser

2013 ◽  
Vol 274 ◽  
pp. 596-599 ◽  
Author(s):  
Ju Hui Chen ◽  
Ting Hu ◽  
Jiu Ru Li
Keyword(s):  
Large Eddy Simulation ◽  
Fluid Model ◽  
Flow Behavior ◽  
Second Order ◽  
Order Moment ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Two Fluid Model ◽  
Two Fluid ◽  
Particle Approach

Flow behavior of gas and particles is performed by means of gas–solid two-fluid model with the large eddy simulation for gas and the second order moment for particles in the riser. This study shows that the computed solids volume fractions of two cases are compared with the experimental data using a two-dimensional model. The gas and solid velocity is computed.

Lattice Boltzmann Simulation of Two-Fluid Model Equations

2008 ◽  
Vol 47 (23) ◽  
pp. 9165-9173 ◽  
Author(s):  
Krishnan Sankaranarayanan ◽  
Sankaran Sundaresan
Keyword(s):  
Lattice Boltzmann ◽  
Fluid Model ◽  
Lattice Boltzmann Simulation ◽  
Two Fluid Model ◽  
Model Equations ◽  
Two Fluid

Large-Eddy Simulation of turbulent, cavitating fuel flow inside a 9-hole Diesel injector including needle movement

2016 ◽  
Vol 18 (3) ◽  
pp. 195-211 ◽  
Author(s):  
Felix Örley ◽  
Stefan Hickel ◽  
Steffen J Schmidt ◽  
Nikolaus A Adams
Keyword(s):  
Large Eddy Simulation ◽  
Fluid Model ◽  
Immersed Boundary ◽  
Small Scale ◽  
Two Phase ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Flow Features ◽  
Two Fluid Model ◽  
Liquid Flows

We investigate the turbulent multiphase flow inside a nine-hole common rail Diesel injector during a full injection cycle of ISO 4113 diesel fuel into air by implicit large-eddy simulation (LES). The simulation includes a prescribed needle movement obtained from a one-dimensional multi-domain simulation. The injector geometry is represented by a conservative cut-element-based immersed boundary method with subcell resolution, which has been developed for the application in the context of cavitating liquid flows. We employ a barotropic two-phase two-fluid model, where all components (i.e. air, liquid diesel, gaseous diesel) are represented by a homogenous mixture approach. The cavitation model is based on a thermodynamic equilibrium assumption. Compressibility of all phases enables full resolution of collapse-induced pressure wave dynamics. The analysis of the turbulent flow field reveals that the opening and closing phase are dominated by small-scale turbulence, while in the main injection phase large vortical structures are formed in the needle volume and reach into the nozzle holes. Violent collapse events of cavitation structures are detected during the closing phase in the nozzle holes and after closing in the sac hole region. A comparison with LES results with a fixed injector needle at different lift positions shows a good agreement for large needle lifts, while the needle movement has significant effects on important flow features at low needle lifts.

Wall effects on space averaged two-fluid model equations for simulations of gas–solid flows in risers

2013 ◽  
Vol 89 ◽  
pp. 206-215 ◽  
Author(s):  
Srujal Shah ◽  
Jouni Ritvanen ◽  
Timo Hyppänen ◽  
Sirpa Kallio
Keyword(s):  
Fluid Model ◽  
Wall Effects ◽  
Two Fluid Model ◽  
Model Equations ◽  
Two Fluid
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