弹性界面液滴是一种由弹性界面包裹而成的液滴，常出现在复杂流动边界区域内，如血管网络中流动的血细胞、储油层微小孔隙内的原油乳状液滴等。因此，研究复杂流动区域内弹性界面液滴动力学对揭示微血管中血液流变学特性、改善储油层原油开采效率等具有重要的理论意义。现有弹性界面液滴研究多局限于规则流动区域，复杂流动区域内弹性界面液滴流动研究仍是多相流研究难点之一。本项目基于多相流动力学和薄膜弹性力学，同时考虑流动区域复杂性和液滴界面粘弹性，发展一种基于非结构化网格Front Tracking方法的弹性界面液滴模型，结合微通道内弹性界面液滴运动变形的可视化实验对模型有效性进行验证。基于该模型开展分叉、弯曲、渐缩等典型复杂流动区域内弹性界面液滴流动特性研究，揭示流动区域复杂性及界面粘弹性对液滴运动、变形的影响机理。该研究的开展有助于拓展多相流研究方法、促进工业技术发展，具有重要的学术意义和实际应用价值。

A capsule is a small liquid drop enclosed by an elastic membrane, which often is found in complex flow regions, such as a blood cell in the capillary network and a crude oil emulsion droplet in reservoir micropores. Dynamics of capsules flowing in complex flow regions is particularly important for revealing the blood rheology in micro-vessel and improving the oil recovery efficiency. Most of the existing models for capsule are restricted to the regular regions, and dynamics research of capsule in the complex flow regions is still one of the research challenges for multi-phase flow. This project, combined with the multi-phase fluid mechanics and membrane elastic mechanics, presents a capsule flow model based on Front Tracking Method on unstructured grid, which is considering the flow region complexity and the membrane elasticity of the capsule. Based on the capsule flow model, the dynamics of capsule flowing in the representative complex regions is studied, to reveal the influence mechanism of regions complexity and interface elastic properties on the movement and deformation of capsule. The research work on capsule flowing in complex flow region can not only enrich the research method for multiphase flow, but also promote development of related industrial technology. Therefore, the work has important academic significance and practical value.