粒子-网格混合方法模拟液滴夹带

项目名称： 粒子-网格混合方法模拟液滴夹带

项目编号： No.10805011

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 郭赟

作者单位： 哈尔滨工程大学

项目金额： 23万元

中文摘要： 本研究利用近年来新兴的粒子算法和传统的网格技术，用大量微细粒子来跟踪快速剧烈变化的气液交界面，较好地解决了两相交界面复杂多变的问题，用成熟的网格方法来计算流场，利用二者的优势来共同模拟气液两相流动中的典型问题-液滴夹带。通过对反应堆中环状流动下的液膜特性、液滴夹带起始点和大量液滴夹带工况的系统研究，较为深入地探索了液滴脱离壁面的特性，大量液滴的运动规律，获得了液滴夹带率，并同经验关系式进行了比对。在研究过程中，探索了湍流模型对数值计算的影响规律，进行了并行加速算法的研究，在一定程度上优化了程序；所获得的混合方法数值计算程序同反应堆系统分析程序联合使用，对反应堆事故工况下两相流动不稳定性进行了预测与多尺度分析，取得了较好的结果。通过本项目所获得的模型及程序对两相流动的数值求解具有重要的参考意义，在目前两相求解方法纷繁复杂的局面下，这一思想有一定的优势，值得推广，有可能通过进一步的发展从而建立一套全新的用于复杂多相流动分析的方法，对于多相流动的研究具有基础推动作用。

中文关键词： 粒子网格混和方法；气液两相流；液滴夹带；数值模拟；并行计算

英文摘要： The new particle method and classical grid technology are combined in this research. A finite ensemble of tiny particles are used to track the wildly changing interface between gas and liquid, which can well solve the complex and various two-phase interface problem, and the classic grid method is used to obtain the flow field. The droplet entrainment is analyzed by this combined method based on their advantages in present study. Through the researches of the fluid film characteristics under annular flow, the onset of droplet escaping from the film and a lot of droplets entrainment moving conditions; the dynamics of a lot of droplets and the entrainment ratio were obtained and some results were compared with empirical correlations. During this procedure the influence of turbulent models and parallel accelerated computation technology were also investigated and developed the original code. Further the developed code was used in the two-phase flow instability multiscale analysis under reactor accident condition compiled with system analysis code, and good results were achieved. The model and code developed in present research have important reference value for the two-phase flow numerical calculation. Now at the maze situation of so many solving methods for two-phase flow present idea has some advantages and if it can be supported continuously a new method for complex multi-phase flow analysis can be built in the future. It can promote multi-phase flow research fundamentally.

英文关键词： particle-grid hybrid method;gas-liquid two phase flow; droplet entrainment; numerical simulation; parallel calculation