Specific-heat ratio effects on the interaction between shock wave and heavy-cylindrical bubble: based on discrete Boltzmann method

TL;DR

This study investigates how the specific-heat ratio influences shock wave and heavy-cylindrical bubble interactions using the discrete Boltzmann method, revealing complex thermodynamic non-equilibrium behaviors and their effects on fluid dynamics.

Contribution

It introduces a detailed analysis of specific-heat ratio effects on shock-bubble interactions and TNE behaviors using the discrete Boltzmann method, which is novel in this context.

Findings

Specific-heat ratio significantly affects entropy production from NOEF.

Effects on NOMF and NOEF entropy production are opposite.

TNE behaviors exhibit complex, differing responses to the specific-heat ratio.

Abstract

Specific-heat ratio effects on the interaction between a planar shock wave and a two-dimensional heavy-cylindrical bubble are studied by the discrete Boltzmann method. Snapshots of schlieren images and evolutions of characteristic scales, being consistent with experiments, are obtained. The specific-heat ratio effects on some relevant dynamic behaviors such as the bubble shape, deformation process, average motion, vortex motion, mixing degree of the fluid system are carefully studied, as well as the related Thermodynamic Non-Equilibriums (TNE) behaviors including the TNE strength, entropy production rate of the system. Specifically, it is found that the influence of specific-heat ratio on the entropy production contributed by non-organized energy flux (NOEF) is more significant than that caused by non-organized momentum flux (NOMF). Effects of specific-heat ratio on entropy production caused by NOMF and NOEF are contrary. The effects of specific-heat ratio on various TNE quantities show interesting differences. These differences consistently show the complexity of TNE flows which is still far from clear understanding.