### Abstract

Original language | English |
---|---|

Pages (from-to) | 266-275 |

Number of pages | 10 |

Journal | Computers & Fluids |

Volume | 176 |

Early online date | 21 Dec 2016 |

DOIs | |

Publication status | Published - 15 Nov 2018 |

### Fingerprint

### Keywords

- solid-liquid suspension
- lattice-Boltzmann method
- discrete particle method
- hindered settling
- two-way coupling
- agitated suspensions

### ASJC Scopus subject areas

- Computer Science(all)
- Engineering(all)

### Cite this

**Assessing Eulerian-Lagrangian simulations of dense solid-liquid suspensions settling under gravity.** / Derksen, J. J. (Corresponding Author).

Research output: Contribution to journal › Article

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TY - JOUR

T1 - Assessing Eulerian-Lagrangian simulations of dense solid-liquid suspensions settling under gravity

AU - Derksen, J. J.

PY - 2018/11/15

Y1 - 2018/11/15

N2 - We study dense solid-liquid suspensions through numerical simulations. The liquid flow is solved by the lattice-Boltzmann method on a fixed (Eulerian), cubic, uniform grid. Spherical solid particles are tracked through that grid. Our main interest is in cases where the grid spacing and the particle diameter have the same order of magnitude (d/Δ=O(1)). Critical issues then are the mapping operations that relate properties on the grid and properties of the particles, e.g. the local solids volume fraction seen by a particle, or the distribution of solid-to-liquid hydrodynamic forces over grid points adjacent to a particle. For assessing the mapping operations we compare results for particles settling under gravity in fully periodic, three-dimensional domains of simulations with d/Δ=O(1) to much higher resolved simulations (d/Δ=O(10)) that do not require mapping. Comparisons are made in terms of average slip velocities as well as in terms of liquid and fluid velocity fluctuation levels. Solids volume fractions are in the range 0.3 to 0.5, Reynolds numbers are of order 0.1 to 10.

AB - We study dense solid-liquid suspensions through numerical simulations. The liquid flow is solved by the lattice-Boltzmann method on a fixed (Eulerian), cubic, uniform grid. Spherical solid particles are tracked through that grid. Our main interest is in cases where the grid spacing and the particle diameter have the same order of magnitude (d/Δ=O(1)). Critical issues then are the mapping operations that relate properties on the grid and properties of the particles, e.g. the local solids volume fraction seen by a particle, or the distribution of solid-to-liquid hydrodynamic forces over grid points adjacent to a particle. For assessing the mapping operations we compare results for particles settling under gravity in fully periodic, three-dimensional domains of simulations with d/Δ=O(1) to much higher resolved simulations (d/Δ=O(10)) that do not require mapping. Comparisons are made in terms of average slip velocities as well as in terms of liquid and fluid velocity fluctuation levels. Solids volume fractions are in the range 0.3 to 0.5, Reynolds numbers are of order 0.1 to 10.

KW - solid-liquid suspension

KW - lattice-Boltzmann method

KW - discrete particle method

KW - hindered settling

KW - two-way coupling

KW - agitated suspensions

U2 - 10.1016/j.compfluid.2016.12.017

DO - 10.1016/j.compfluid.2016.12.017

M3 - Article

VL - 176

SP - 266

EP - 275

JO - Computers & Fluids

JF - Computers & Fluids

SN - 0045-7930

ER -