用格子Boltzmann方法数值模拟三维空化现象

Three-dimensional cavitation simulation using lattice Boltzmann method

空化是一种微观、瞬时、随机、多相的复杂现象,其过程中所产生的极端条件以及伴随的一系列空化效应,将对液流系统产生破坏性和建设性两方面的作用.采用基于Shan-Chen模型的单组分多相流格子Boltzmann方法对水体中的三维空化现象进行了数值模拟,研究了低压下水体中气核半径与空化现象的相互关系,成功再现了低压下水体中微小气核发展成气泡的过程,并进一步研究了水体依次流经低压区、高压区时空化产生、发展、溃灭的全过程.数值模拟结果和理论预测结果符合良好.

The cavitation is a complex phenomenon which is microcosmic,transient,stochastic and multiphased. The extreme condition and related cavitation effects which the collapsed cavities generate will affect the liquid-vapor system greatly. In this article,we accurately simulate heterogeneous cavitation in liquid system with single component multiphase lattice Boltzmann model and successfully reproduce the complete cavitation process of a bubble：inception,growth and collapse. The relationship between the radius of bubble seed and cavitation for a specified tension has been investigated by lattice Boltzmann method simulations. The simulations show excellent agreement with energy considerations based on interface formation and bubble expansion.