复杂多介质流体系统中动态润湿和界面动力学特性研究

润湿现象和界面流动在自然界生物生存、工业应用及现代科技的发展中起到了极为重要的作用。针对复杂多介质流体系统中动态润湿和界面动力学特性问题，综合实验测试、数值模拟和理论分析等研究手段，研究高分子聚合物溶液与壁面相互作用的微观机制及宏观行为，诠释聚合物分子和壁面粗糙度对接触线失稳的影响机制，验证多相移动接触线模型，探讨粘弹性液滴的润湿动力学特性和多相耦合润湿的动力学机理，揭示多相流动、粘弹性颗粒变形与多孔结构交互作用下的流体输运机制；同时，发展移动接触线亚网格模型和锐利界面方法，大幅提升现有界面流动数值模拟的能力。不仅从力学角度全面认识流体流变特性、多介质流体与壁面作用、孔隙壁面结构等因素对润湿现象和界面运动的影响机制，引领界面流体力学的科学前沿研究，也为重要工程应用问题如动态润湿及界面形态响应的精准控制和非均相体系粘弹性颗粒驱油等提供理论分析和技术支持。

Wetting phenomena and interface flows play an important role in the survival of animals and plants in nature, industrial applications and the development of modern technology. Aiming at the wetting and interface dynamics in complex multi-media fluid system, we propose the following studies by means of a combination of experiments, simulations and theoretical analysis, including the interaction between polymer and wall in the meso-scale and the corresponding interface behavior in the macro-scale, the sticking effect of polymer molecule due to wall roughness on the contact line instability, and the validation of multi-phase moving contact line model. We also investigate the wetting dynamics of viscoelastic-elastic droplets and the wetting coupling of multi-component fluids, and reveal the mechanism of fluid transportation subject to the interaction of multi-phase flows, deformation of viscoelastic particles and porous structures. We are about to develop the moving contact line sub-grid model and sharp interface method, which will greatly improve the ability of numerical simulation of interface flows. This proposal provides a comprehensive understanding of influence of fluid rheological properties, interaction between multi-component fluids and substrate, pore structures on the wetting phenomena and interface flows from the mechanical point of view, and leads the scientific frontier research of interface fluid mechanics. Furthermore, it also provides theoretical analysis and technical support for important engineering applications such as accurate control of interface morphology response with dynamic wetting and oil recovery by viscoelastic particles in heterogeneous systems.