Effects of gravity induced pressure variations for thermal liquid-gas phase-change simulations with the pseudopotential lattice Boltzmann method

TL;DR

This study investigates how gravity-induced pressure variations affect phase-change simulations using the pseudopotential lattice Boltzmann method, highlighting the importance of pressure effects for accurate modeling of boiling and cavitation phenomena.

Contribution

It is the first to analyze the impact of gravity-induced pressure variations on phase stability in lattice Boltzmann simulations, emphasizing their significance for realistic phase-change modeling.

Findings

Different gravitational force models produce qualitatively different phase behaviors.

Pressure variations due to gravity significantly influence phase stability and nucleation.

Careful consideration of gravity effects is essential for quantitative phase-change simulations.

Abstract

Direct simulations of phase-change and phase-ordering phenomena are becoming more common. Recently qualitative simulations of boiling phenomena have been undertaken by a large number of research groups. One seldom discussed limitations is that large values of gravitational forcing are required to simulate the detachment and rising of bubbles formed at a bottom surface. The forces are typically so large that neglecting the effects of varying pressure in the system becomes questionable. In this paper we examine the effect of large pressure variations induced by gravity using pseudopotential lattice Boltzmann simulations. These pressure variations lead to height dependent conditions for phase co-existence and nucleation of either gas or liquid domains. Because these effects have not previously been studied in the context of these simulation methods we focus here on the phase-stability in a one dimensional system, rather than the additional complexity of bubble or droplet dynamics. Even in this simple case we find that the different forms of gravitational forces employed in the literature lead to qualitatively different phenomena, leading to the conclusion that the effects of gravity induced pressure variations on phase-change phenomena should be very carefully considered when trying to advance boiling and cavitation as well as liquefaction simulations to become quantitative tools.