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arXiv 2602.13076physics.flu-dynphysics.comp-ph
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改进的数值方法用于用扩散界面法建模不可溶表面活性剂的两相流

Enhanced numerical approaches for modeling insoluble surfactants in two-phase flows with the diffuse-interface method

Institute of Science Tokyo, School of Engineering(东京科学大学工程学院)

Shu Yamashita, Shintaro Matsushita, Tetsuya Suekane

AI总结:

本文提出改进的数值方法用于用扩散界面法建模不可溶表面活性剂的两相流,通过避免变量的空间导数和独立指定delta函数的宽度来提高准确性,同时保持离散守恒性。

摘要:

表面活性剂存在于两相流的界面处,并显著影响流体动力学。数值模拟对于全面理解这类含表面活性剂的流体至关重要,需要一种能够准确模拟界面处表面活性剂传输的方法。在本研究中,我们基于扩散界面法研究了不可溶表面活性剂的界面传输模型,并提出了两种改进精度的方法:(a) 采用一种避免具有陡峭梯度变量的空间导数的公式;(b) 允许delta函数的宽度独立于界面宽度。这些方法简单且实用,不会导致计算成本、实现复杂性显著增加或界面捕捉精度下降。此外,它们保持了流体和表面活性剂质量的离散守恒性。我们进行了一系列数值测试以证明所提出方法的有效性。最后,我们提出了一个具有挑战性的测试案例,该案例难以准确求解且尚未被讨论过。我们期望这个案例能成为评估和比较文献中各种方法性能的有价值的基准。

英文摘要:

Surfactants reside at the interface of two-phase flows and significantly influence the flow dynamics. Numerical simulations are essential for a comprehensive understanding of such surfactant-laden flows and require a method that can accurately simulate surfactant transport along the interface. In this study, we focus on interfacial transport models for insoluble surfactants based on the diffuse-interface method and propose two approaches to improve their accuracy: (a) adopting a formulation that avoids the spatial derivatives of variables with sharp gradients and (b) allowing the width of the delta function to be specified independently of the interface width. These approaches are simple and practical in that they do not lead to significant increases in computational cost, implementation complexity, or degradation of interface-capturing accuracy. Moreover, they preserve the discrete conservation of both fluid and surfactant mass. We conduct a series of numerical tests to demonstrate the effectiveness of the proposed approaches. Finally, we present a challenging test case that is difficult to solve accurately and has not been previously discussed. We expect this case to serve as a valuable benchmark for evaluating and comparing the performances of various methods proposed in the literature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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