A computational technique based on the pseudo-potential multiphase lattice Boltzmann method (LBM) is employed to investigate the collapse dynamics of cavitation bubbles of various liquids in the vicinity of the solid surface with different wettability conditions. The Redlich-Kwong-Soave equation of state (EoS) that includes an acentric factor is incorporated to consider the physical properties of water $\left({\mathrm{H}}_2\mathrm{O}\right)$, liquid nitrogen $\left(\mathrm{L}{\mathrm{N}}_2\right)$, and liquid hydrogen $\left(\mathrm{L}{\mathrm{H}}_2\right)$ in the present simulations. Accuracy and performance of the present multiphase LBM are examined by simulation of the homogenous and heterogeneous cavitation phenomena. The good agreement of the results obtained based on the present solution algorithm in comparison with the available data confirms the validity and capability of the multiphase LBM employed. Then, the cavitation bubble collapse near the solid wall is studied by considering the ${\mathrm{H}}_2\mathrm{O}$, $\mathrm{L}{\mathrm{N}}_2,$ and $\mathrm{L}{\mathrm{H}}_2$ fluids, and the wettability effect of the surface on the collapse dynamics is investigated. The obtained results demonstrate that the collapse phenomenon for the ${\mathrm{H}}_2\mathrm{O}$ is more aggressive than that of the $\mathrm{L}{\mathrm{H}}_2$ and $\mathrm{L}{\mathrm{N}}_2$. The cavitation bubble of the water has a shorter collapse time with an intense liquid jet, while the collapse process in the $\mathrm{L}{\mathrm{N}}_2$ takes a longer time due to the larger radius of its bubble at the rebound. Also, this study demonstrates that the increment of the hydrophobicity of the wall causes less energy absorption by the solid surface from the liquid phase around the bubble that leads to form a liquid jet with higher kinetic energy. Therefore, the bubble collapse process occurs more quickly for hydrophobic surfaces, regardless of the fluids considered. The present study shows that the pseudopotential LBM with incorporating an appropriate EoS and a robust forcing scheme is an efficient numerical technique for simulation of the dynamics of the cavitation bubble collapse in different fluids.

中文翻译：

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格子Boltzmann模型与Redlich-Kwong-Soave状态方程相结合的模拟各种液体中的空化气泡

采用基于准电位多相晶格玻尔兹曼方法（LBM）的计算技术，研究了在不同润湿性条件下，固体表面附近各种液体的空化气泡的塌陷动力学。包含一个偏心因子的Redlich-Kwong-Soave状态方程（EoS）被纳入考虑水的物理性质$（{\mathrm{H}}_2\mathrm{Ø}）$液氮 $（\mathrm{大号}{\mathrm{ñ}}_2）$和液态氢 $（\mathrm{大号}{\mathrm{H}}_2）$在目前的模拟中。通过模拟同质和异质空化现象来检验当前多相LBM的准确性和性能。与现有数据相比，根据本解决方案算法获得的结果吻合良好，证实了所采用的多相LBM的有效性和能力。然后，通过考虑以下因素来研究固体壁附近的空化气泡破裂：${\mathrm{H}}_2\mathrm{Ø}$， $\mathrm{大号}{\mathrm{ñ}}_2，$ 和 $\mathrm{大号}{\mathrm{H}}_2$流体，并研究了表面的湿润性对塌陷动力学的影响。获得的结果表明，该结构的倒塌现象${\mathrm{H}}_2\mathrm{Ø}$ 比 $\mathrm{大号}{\mathrm{H}}_2$ 和 $\mathrm{大号}{\mathrm{ñ}}_2$。水的空化气泡在强烈的液体喷射下具有较短的崩塌时间，而在$\mathrm{大号}{\mathrm{ñ}}_2$由于反弹时气泡半径较大，因此需要更长的时间。同样，这项研究表明，壁疏水性的增加导致固体表面从气泡周围的液相吸收较少的能量，从而形成具有较高动能的液体射流。因此，与考虑的流体无关，对于疏水性表面，气泡破裂过程会更快地发生。本研究表明，结合了适当的EoS和鲁棒的强迫方案的伪势LBM是一种用于模拟空化气泡在不同流体中塌陷动力学的有效数值技术。