Direct simulation of liquid-gas-solid flow with a free surface lattice Boltzmann method
Abstract
Direct numerical simulation of liquid-gas-solid flows is uncommon due to the considerable computational cost. As the grid spacing is determined by the smallest involved length scale, large grid sizes become necessary -- in particular if the bubble-particle aspect ratio is on the order of 10 or larger. Hence, it arises the question of both feasibility and reasonability. In this paper, we present a fully parallel, scalable method for direct numerical simulation of bubble-particle interaction at a size ratio of 1-2 orders of magnitude that makes simulations feasible on currently available super-computing resources. With the presented approach, simulations of bubbles in suspension columns consisting of more than fully resolved particles become possible. Furthermore, we demonstrate the significance of particle-resolved simulations by comparison to previous unresolved solutions. The results indicate that fully-resolved direct numerical simulation is indeed necessary to predict the flow structure of bubble-particle interaction problems correctly.
Cite
@article{arxiv.1712.07028,
title = {Direct simulation of liquid-gas-solid flow with a free surface lattice Boltzmann method},
author = {Simon Bogner and Jens Harting and Ulrich Rüde},
journal= {arXiv preprint arXiv:1712.07028},
year = {2018}
}
Comments
submitted to International Journal of Computational Fluid Dynamics