【摘要】 研究了耦合Level Set(LS)方法处理介质界面算法,通过对比旋转流场和剪切流场下的界面捕捉情况,给出了各种不同方法在处理介质界面过程中的优缺点,分析了产生这种现象的原因。通过对比分析得到,耦合粒子Level Set(Particle Level Set,PLS)方法以及耦合Level Set和VOF(Coupled Level Set and Volume of Fluid,CLSVOF)方法相比于单纯的LS方法,在流体守恒性质方面有很大的提高,PLS方法可以根据撒播粒子和精确追踪示踪粒子修正LS界面;而CLSVOF方法可以通过重构界面和体积输运,重新初始化LS函数。在实际物理应用中,PLS方法多次重新撒播示踪粒子会降低界面精度,且对每个示踪粒子的追踪需要加大CPU内存,而CLSVOF方法更加高效和合理。更多还原

【Abstract】 The coupled Level Set(LS)method algorithm of medium interface treatment was studied. Advantages and disadvantages of different methods in medium interface treatment process were given by comparing different solution of rotating flow and shearing flow,and the reason is analysed.Particle Level Set(PLS)method and Coupled Level Set and Volume of Fluid(CLSVOF)method are greatly improved in the conservation property of fluid compared on the pure LS through the contrast test.For PLS method,the LS interface can be corrected through reseeding and tracking the particle accurately. For CLSVOF method,the LS function can be reinitialized by reconstructing the interface and transporting the volume.In practical application,the CLSVOF method is more efficient and reasonable,since frequently reseeding will reduce the accuracy and tracking each particle requires more CPU memory for PLS method.更多还原