电场下气泡行为的三种界面捕捉方法性能分析

FLUENT软件提供了VOF、VOF+LS和VOF+LS+SPP 3种方法用于电场下气泡动力学行为研究,其中VOF+LS+SPP方法计算精度最高。为了进一步揭示该方法具有较高计算精度的原因,分别利用这3种方法对均匀电场下气泡的变形问题进行数值模拟研究。结果表明:VOF方法很难获得网格独立的解;VOF+LS方法可以获得网格独立的解,但是气泡界面处的介电常数梯度和电场强度计算不精确,电场力分布均匀性很差,气泡变形计算精度较低,与理论解最大偏差高达62%;VOF+LS+SPP方法不仅可以获得网格独立的解,而且对气泡界面处介电常数梯度和电场强度的计算非常精确,电场力分布均匀性良好,气泡变形计算精度较高,与理论解最大偏差仅为7%。

Performance Analyses of Three Interface Capturing Methods for Simulating Bubble Behaviors in the Electric Field

The FLUENT software provides VOF method,VOF+LS method,and VOF+LS+SPP method for the study of bubble dynamic behaviors in the electric field.The VOF+LS+SPP method has the highest computational accuracy.In order to further reveal the reason that why this method has high computational precision,the three different methods are applied to the simulation of bubble deformation under a uniform electric field.Results show that it is difficult to obtain the grid-independent solutions for VOF method.Although the VOF+LS method can obtain the grid-independent solutions,the permittivity gradient and electric field intensity at the bubble interface are not accurately calculated.The distribution of electric field force is somewhat non-uniform.The calculation of bubble deformation has low precision and the maximum deviation is up to 62%.The VOF+LS+SPP method not only obtains the grid-independent solutions,but also accurately predicts the permittivity gradient and the electric field intensity at the bubble interface accurately.The electric field force distributes uniformly around the bubble interface.The calculation of bubble deformation has high precision and the maximum deviation from theoretical solution is only 62%.