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Fluid-grain coupling using the Lattice Boltzmann method

Abstract : The objective of this chapter is to describe the interfacing of the Lattice Boltzmann Method for the simulation of fluids with the Discrete Element Method for the simulation of a collection of rigid particles. For the sake of simplicity, the statistical physics concepts underlying the method are not detailed, and the algorithms are only presented in 2D. The Boltzmann equation is discretized using a standard D2Q9 model in which the fluid pseudo-particles can move on a lattice with 9 possible directions of motion. The classical fluid dynamics quantities are defined as sums of local probability densities of finding particles at a specific time and position, and with a given momentum. The Lattice Boltzmann equation is then resolved in two steps. The first step is the so-called Streaming step that consists in computing the advection of the fluid particles. The second step computes the relaxation of the system as a result of possible collisions between fluid particles. Two models are presented for the collision step: the Single Relaxation Time model and the Multiple Relaxation time model. Different boundary conditions are detailed for the implementation of no-slip conditions for the fluid in contact with solid grains or walls (imposed pressure, imposed flow, open boundary conditions and Bounce Back approaches. . . ). Finally, we detail the momentum exchange method for the fluid-grain coupling, and we conclude with examples of simulated systems using this approach.
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https://hal.inrae.fr/hal-02938877
Contributor : Jean-Yves Delenne <>
Submitted on : Tuesday, September 15, 2020 - 11:07:41 AM
Last modification on : Wednesday, May 12, 2021 - 3:40:30 AM

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  • HAL Id : hal-02938877, version 1

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Jean-Yves Delenne, Lhassan Amarsid, Patrick Mutabaruka, Vincent Richefeu, Farhang Radjai. Fluid-grain coupling using the Lattice Boltzmann method. Kianoosh Taghizadeh; Gael Combe; Stefan Luding. Discrete Element Modeling, 2017, ALERT Doctoral School 2017, 978-2-9542517-9-0. ⟨hal-02938877⟩

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