不同多相流模型在航行体出水流场数值模拟中的应用

Multiphase models for flow field numerical simulation of a vehicle rising from water

基于VOF和Mixture两种均相流模型,并结合输运方程类空化模型、k-ε湍流模型和动网格技术,针对圆柱形航行体出水过程进行了数值模拟,获得了无空化、带空泡两种状态下航行体出水过程中的多相流物理景象和表面压力变化历程。根据计算结果分析了VOF模型、Mixture模型在多相流界面捕捉、压力计算等方面的异同,并给出了两种模型的适用范围,在理论研究和工程应用上都具有重要意义。

Here, the prediction capabilities of Mixture model and VOF one for the simulation of unsteady flows around a moving cylindrical vehicle were evaluated. In the simulation, the k-ε turbulence model was used along with the transport equation-based cavitation model to simulate the vehicle rising from water process, the dynamic mesh technique was applied. Results were obtained under two states of non-cavitation and cavitation, respectively and the transient flow structures and time evolution of pressure distribution were revealed. According to the numerical results, the difference between the capability of VOF model and that of Mixture model was analyzed. Their applicable ranges are very important for theoretical study and engineering application.