Studies Of Different Numerical Models For
A Turbulent Particulate Flow In
A Square Pipe With 90° Bend
Author(s)
D. Schellander, D. Kahrimanovic & S. Pirker
Abstract
In process industry simulating particulate flow is one of the actual top level
research topics. Driven by the wish for readily available simulation results with
predictive description of the processes in fluid and granular flow, many
mathematical models have been proposed.
Among these models Eulerian and Lagrangian based particle models are most
common. These models have been additionally augmented by sub-models in
order to picture effects like particle rotation, rough wall treatment or interparticle
collisions. The last one includes in Lagrangian phase a very high
increase of computational effort because of finding collision partners.
In this paper these models are tested at a very simple flow situation of a 90°
bended square duct flow. From classical kinetic theory, Eulerian particle model
is considered and also a discrete phase model, known as Lagrangian particle
model. Finally, a hybrid Eulerian-Lagrangian model, EUgran+, is introduced
using a new radial distribution coefficient, based on measurements of Gidaspow
and Huilin. The presented hybrid model is based on an Eulerian model that is
augmented by Lagrangian tracer particles. These tracer particles provide
additional information on e.g. particle rotation and particle wall treatment that
prepares information for the classical Eulerian phase, using coupling equations.
It was the aim to create a robust simulation model for simulating particulate
flows with high and low loaded particle regions. The second aim was to create a
model which gives comparable accuracy as a Lagrangian model with particle
collision, without calculating collisions in Lagrangian phase, to decrease the
computational time.
Keywords: hybrid model, particulate flow, transport system, tracer particles.
Keywords
hybrid model, particulate flow, transport system, tracer particles
Related Book
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