含泥砂颗粒的多相流动广泛存在于海上油气和水合物开发的管输过程中，多相流场中泥砂颗粒对管壁的冲蚀磨损已成为当前海上资源开发的主要安全隐患。本项目采用理论分析、数值模拟与实验研究相结合的方法，基于颗粒动力学、多相流体力学，分析含泥砂颗粒多相流动特性及颗粒分布特征，建立泥砂颗粒在多相流气核、液膜、段塞体单元中的动力学模型以及泥砂颗粒相间迁移动力学模型。建立近壁面湍流猝发预测模型，研究颗粒运动与近壁面拟序结构之间的相互作用关系，求解多相流泥砂颗粒轨迹。基于接触力学、摩擦学等学科理论，研究并揭示金属表面冲蚀损失机制。建立气-液-固体颗粒-管壁多向耦合的管道冲蚀模型，发展管道防冲蚀的基础理论，实现多相流中泥砂颗粒冲蚀过程的预测和控制。项目预测成果将完善多相流条件下泥砂颗粒冲蚀理论，为实现海上资源安全开发以及制定相关防护规范提供必要的理论和技术支撑，具有重要的科学意义和应用价值。

The multiphase flow with sand particles is widely existed in the process of offshore oil and gas pipeline transportation and hydrate exploitation. The erosion wear of the multiphase flow pipelines caused by sand particles has become the main hazard in the process of marine resources exploitation. In this project, theoretical analysis, numerical simulation and experimental researches are combined together to study the sand particles erosion mechanism in multiphase flow pipe. The method is based on particle dynamics and multiphase fluid mechanics which are used to analyze the property of multiphase flow with sand and the characteristics of particle distribution and establish the dynamic model of sand particles in multiphase flow such as Taylor bubbles, liquid film and liquid slug. What is more, sand particles migration dynamics model is also built. The near wall turbulence burst prediction model is built to study the interaction between particle motion and near wall coherent structure in order to get the particle trajectory in multi-phase flow. The erosion mechanism of metal surface can be studied and revealed based on the theories of contact mechanics and tribology. The erosion model with gas-liquid-solid particle-pipe wall complex coupling is established to predict and control the erosion process of sand particles in multiphase flow. The results of this project will enrich and develop the theories of the erosion in multiphase flow and anti-erosion properties of pipelines. Additionally, it is of great scientific significance and engineering application value for exploitation of marine resources as well as the enacting of protecting specification to provide necessary theoretical and technical support.