近复杂几何固壁空泡溃灭的伪势格子Boltzmann建模

Modeling for collapsing cavitation bubble near complex geometry solid wall by improved pseudopotential lattice Boltzmann model

格子Boltzmann方法伪势多相模型具有高效性和复杂几何边界实施的简易性。该文采用改进作用力的伪势多相模型,通过优化参数实现最大程度的热力学一致性,进而提高模型的密度比和稳定性。分别从伪速度、网格不变性、Young-Laplace验证等方面研究了改进模型的性能。通过改进的模型模拟了复杂几何固壁附近空泡溃灭过程。分析了空化泡溃灭阶段的密度场、压力场和速度场演化过程,以及复杂几何固壁附近的空泡动力学特性。结果表明伪势格子Boltzmann方法在探索空泡溃灭和复杂几何固壁间的相互作用规律研究中是一种有效的工具。

The pseudopotential multiphase model of the lattice Boltzmann method（LBM） is used to study thecollapsing cavitation bubble near complex geometrical solid wall. In this paper, an improved forcing scheme,which can achieve thermodynamic consistency by optimizing related parameters, is adopted to improve densityratio and stability. The performance of the improved model is studied from spurious current, independenceof grid and verification of the Young-Laplace law. The cavitation bubble collapse near complex geometricalsolid wall is modeled by the improved model. Meanwhile, the density field, pressure fields and velocity field evolution process of cavitation bubble collapsing stage are analyzed, as well as the dynamic characteristics ofthe cavitation bubble collapsing near complex geometrical solid wall. It is showed that the pseudopotentialmultiphase LBM is an effective tool to investigate the interaction between the collapsing bubble and complexgeometrical solid wall.