Color-gradient lattice Boltzmann model with nonorthogonal central moments: Hydrodynamic melt-jet breakup simulations

TL;DR

This paper introduces a new lattice Boltzmann model combining central moments and color-gradient methods, enabling stable and accurate simulations of high-Reynolds-number two-phase flows like melt-jet breakup.

Contribution

The paper develops a novel LB model integrating nonorthogonal central moments with color-gradient techniques for improved stability in complex flow simulations.

Findings

Model remains stable at Reynolds numbers up to 10^6

Enables realistic melt-jet breakup simulations

Improves accuracy over previous LB models

Abstract

We develop a lattice Boltzmann (LB) model for immiscible two-phase flow simulations with central moments (CMs). This successfully combines a three-dimensional nonorthogonal CM-based LB scheme [A. De Rosis, Phys. Rev. E 95, 013310 (2017)] with our previous color-gradient LB model [S. Saito, Y. Abe, and K. Koyama, Phys. Rev. E 96, 013317 (2017)]. Hydrodynamic melt-jet breakup simulations show that the proposed model is significantly more stable, even for flow with extremely high Reynolds numbers, up to $O(10^6)$. This enables us to investigate the phenomena expected under actual reactor conditions.