A Discrete Particle Model for Bubble-Slug Two-Phase Flows

1993 ◽  
Vol 107 (2) ◽  
pp. 367-377 ◽  
Author(s):  
John A. Trapp ◽  
Glen A. Mortensen
Keyword(s):  
Particle Model ◽  
Two Phase Flows ◽  
Two Phase ◽  
Discrete Particle ◽  
Discrete Particle Model

CFD Modelling of Gear Windage Losses: Two Phase Modelling Using Particle Injections

2010 ◽  
Author(s):  
Thomas Webb ◽  
Carol Eastwick ◽  
Herve´ Morvan
Keyword(s):  
Bevel Gear ◽  
Particle Model ◽  
Spiral Bevel Gear ◽  
Outer Diameter ◽  
Two Phase Flows ◽  
Two Phase ◽  
Strong Concentration ◽  
Discrete Particle ◽  
Discrete Particle Model ◽  
Spiral Bevel

This paper presents results for modelling two-phase flows between a rotating spiral bevel gear and a static shroud. The context behind this is a desire to use Computational Fluid Dynamics (CFD) as a tool for reducing heat-to-oil within gas turbine bearing chambers and gearboxes. This paper uses a solid model and mesh technique first presented in [1], and extends it to include visualisation techniques for two-phase flows. A single tooth model of a spiral bevel gear is used with a Discrete Particle Model (DPM) approach to simulate the presence of oil within the domain using FLUENT 12.0.16. Two different injections are used; the inlet to the shroud simulates the ingestion of a suspended mist from the chamber in which a gear is sitting, and the outer diameter of the gear simulates shedding of oil from the rotating gear onto the surface of the shroud. Variation of the injection velocities allows parameterisation of the destination trajectories and locations of the particles. Analysis of the results of particles injected at the inlet to the shrouded gear show that larger droplets are likely to hit the underside of the nose to the shroud, whereas particles of around 3.5 microns diameter or smaller, will travel further into the domain and hit the gear, or pass entirely through the shrouded region. Droplets injected from the outer diameter of the gear show little sensitivity to the initial velocity and strike the surface of the shroud radially outwards from their injection location. This strong concentration of particles hitting the shroud will provide a useful avenue for further two-phase modelling using a thin-film created with the discrete particle model.

Robust probabilistic calibration of a stochastic lattice discrete particle model for concrete

2021 ◽  
Vol 236 ◽  
pp. 112000
Author(s):  
Eliška Janouchová ◽  
Anna Kučerová ◽  
Jan Sýkora ◽  
Jan Vorel ◽  
Roman Wan-Wendner
Keyword(s):  
Particle Model ◽  
Discrete Particle ◽  
Discrete Particle Model ◽  
Lattice Discrete Particle Model

Modeling of aggregation kernels for fluidized beds using discrete particle model simulations

Particuology ◽  
2014 ◽  
Vol 13 ◽  
pp. 134-144 ◽  
Author(s):  
Nageswara Rao Narni ◽  
Mirko Peglow ◽  
Gerald Warnecke ◽  
Jitendra Kumar ◽  
Stefan Heinrich ◽  
...  
Keyword(s):  
Fluidized Beds ◽  
Particle Model ◽  
Discrete Particle ◽  
Model Simulations ◽  
Discrete Particle Model

Numerical Simulation of Proppant Transportation in Hydraulic Fracture Based on DDPM-KTGF Model

2019 ◽  
Author(s):  
Yan Zhang ◽  
Xiaobing Lu ◽  
Xuhui Zhang ◽  
Peng Li
Keyword(s):  
Volume Fraction ◽  
Engineering Application ◽  
Gas Production ◽  
Particle Model ◽  
Hydraulic Fractures ◽  
Single Fracture ◽  
Particulate Flows ◽  
Gas Reservoirs ◽  
Two Phase ◽  
Discrete Particle Model

Abstract Hydraulic fracturing is an efficient way to improve the conductivity of the tight oil or gas reservoirs. Proppant transportation in hydraulic fractures need to be investigated because the proppant distribution directly affects the oil or gas production. In this paper, the dense discrete particle model (DDPM) combined with the kinetic theory of granular flow (KTGF) are used to investigate the proppant transportation in a single fracture. In this model, the effects of proppant volume fraction, proppant-water interaction, proppant-proppant collision, and proppant size distribution are considered. The proppant-proppant collision is derived from the proppant stress tensor. This model is applicable from dilute to dense particulate flows. The simulated results are similar to the experimental data from other researchers. In further study, the two-phase flow in the cross fractures will be considered for engineering application.

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