Transport modeling of sedimenting particles in a turbulent pipe flow using Euler-Lagrange large eddy simulation
A volume-filtered Euler-Lagrange large eddy simulation methodology is used to predict the physics of turbulent liquid-solid slurry flow through a horizontal pipe. A dynamic Smagorinsky model based on Lagrangian averaging is employed to account for the sub-filter scale effects in the liquid phase. A...
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Main Authors | , |
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Format | Journal Article |
Language | English |
Published |
05.11.2014
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Subjects | |
Online Access | Get full text |
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Summary: | A volume-filtered Euler-Lagrange large eddy simulation methodology is used to
predict the physics of turbulent liquid-solid slurry flow through a horizontal
pipe. A dynamic Smagorinsky model based on Lagrangian averaging is employed to
account for the sub-filter scale effects in the liquid phase. A fully
conservative immersed boundary method is used to account for the pipe geometry
on a uniform cartesian grid. The liquid and solid phases are coupled through
volume fraction and momentum exchange terms. Particle-particle and
particle-wall collisions are modeled using a soft-sphere approach. A series of
simulations have been performed by varying the superficial liquid velocity to
be consistent with the experimental data by Dahl et al. (2003). Depending on
the liquid flow rate, a particle bed can form and develop different patterns,
which are discussed in the light of regime diagrams proposed in the literature.
The fluctuation in the height of the liquid-bed interface is characterized to
understand the space and time evolution of these patterns. Statistics of
engineering interest such as mean velocity, mean concentration, and mean
streamwise pressure gradient driving the flow are extracted from the numerical
simulations and presented. Sand hold-up calculated from the simulation results
suggest that this computational strategy is capable of accurately predicting
critical deposition velocity. |
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DOI: | 10.48550/arxiv.1411.1475 |