ABSTRACT Accurate prediction of oil dispersion has been challenging due to its highly deformed/dispersed interface as well as small-scale oil-water mixing. In this paper, a refined Incompressible SPH (Smoothed Particle Hydrodynamics)-based method is proposed for simulations of oil spill problems. In the proposed method, the presence of oil is taken into consideration with concentration function and physical properties of computational points (particles), i.e. density and viscosity, are varied based on the concentration of oil. The proposed method incorporates a LES-based turbulence model, namely SPS (Sub-Particle-Scale) turbulence model, in order to capture small-scale turbulence effects. Diffusion equation is further implemented so as to reproduce the sub-particle-scale oil-water mixing effects. Interfacial surface tension is considered through potential-based modeling with consideration of the highly deformed/dispersed interface. A set of previously proposed refined schemes are also applied for accurate/robust simulations. The stability and accuracy of proposed ISPH-based method are investigated by conducting benchmark tests.

中文翻译：

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一种改进的基于多相ISPH的溢油精确建模方法

摘要 由于其高度变形/分散的界面以及小规模的油水混合，油分散的准确预测一直具有挑战性。在本文中，提出了一种改进的基于不可压缩 SPH（平滑粒子流体动力学）的方法来模拟溢油问题。在所提出的方法中，油的存在被考虑到浓度函数和计算点（粒子）的物理特性，即密度和粘度，基于油的浓度而变化。所提出的方法结合了基于 LES 的湍流模型，即 SPS（亚粒子尺度）湍流模型，以捕获小尺度湍流效应。进一步实施扩散方程，以再现亚粒子尺度的油水混合效果。考虑到高度变形/分散的界面，通过基于电位的建模来考虑界面表面张力。一组先前提出的改进方案也适用于准确/稳健的模拟。通过进行基准测试来研究所提出的基于 ISPH 的方法的稳定性和准确性。