论文标题
多相（n相）流的开源有限体积求解器，涉及牛顿或非牛顿复合液
Open-source finite volume solvers for multiphase (n-phase) flows involving either Newtonian or non-Newtonian complex fluids
论文作者
论文摘要
两种新的控制量求解器多氟乙烯interfoam和Rheomultifluidinterfoam分别为牛顿和非牛顿N相流进行了模拟，这是每个阶段的界面张力和接触角效应的充分考虑。多荧光因素求解器修改了OpenFOAM为牛顿流提供的常规多酶求解器的某些关键方面，从而提高了其效率和鲁棒性，但最重要的是，其表面张力驱动的流量的准确性大大提高了其准确性。新求解器使用基于mu子方法的流体量（VOF）方法，并与合适的连续脉表面力模型结合使用了界面捕获的人造界面压缩；即，使用界面张力系数分解方法来处理相之间的界面张力配对。通过在体积分数的分布上应用Laplacian滤波器，可以实现VOF平滑。 Rheomultifluidinterfoam求解器能够完全考虑到相关液体的复杂非牛顿效应（例如屈服应力，粘弹性等）。为此，开发的求解器结合了Rheotool工具箱（Pimenta and Alves（2017）J。Non-Newtonian Fluid Mech。239，85-104），利用适合对不同类型的流体进行复杂流动性进行建模的本构方程。考虑到典型的基准两相和三相流，我们的求解器进行了广泛的不同流动设置。已经考虑了涉及牛顿，粘塑料和粘弹性液体的流动。与分析解决方案或先前发布的数值数据进行了比较，清楚地证明了新求解器有效，准确地模拟界面张力的能力，以占主导地位的三相流，用于简单和复杂的液体。
Two new control volume solvers multiFluidInterFoam and rheoMultiFluidInterFoam are presented for the simulation of Newtonian and non-Newtonian n-phase flows, respectively, fully accounting for interfacial tension and contact-angle effects for each phase. The multiFluidInterFoam solver modifies certain crucial aspects of the regular multiphaseInterFoam solver provided by OpenFOAM for Newtonian flows, improving its efficiency and robustness, but most importantly improving considerably its accuracy for surface tension driven flows. The new solver uses the volume-of-fluid (VOF) method based on the MULES method and artificial interface compression for the interface capturing, in combination with a suitable continuum surface force model; i.e. the interfacial tension coefficient decomposition method is employed to treat pairings of interfacial tension between the phases. VOF smoothing is also implemented by applying a Laplacian filter on the distribution of volume fractions. The rheoMultiFluidInterFoam solver is capable of fully taking into account complex non-Newtonian effects (e.g. yield stress, viscoelasticity, etc.) of the involved liquids. To this end, the developed solver incorporates the RheoTool toolbox (Pimenta and Alves (2017) J. Non-Newtonian Fluid Mech. 239, 85-104), utilizing a wealth of constitutive equations suitable for modelling different types of fluids with complex rheology. Our solvers are tested for a wide range of different flow setups, considering typical benchmark two-phase and three-phase flows; flows involving Newtonian, viscoplastic and viscoelastic liquids have been considered. Comparisons against analytical solutions or previously published numerical data are performed clearly demonstrating the capability of the new solvers to efficiently and accurately simulate interfacial tension dominated three-phase flows for both simple and complex liquids.
