风雪流灾害数值模拟研究进展

Research Progresses on Snow-drift Disaster Numerical Simulation

风雪流为空气挟带着雪粒子运行的非典型的气-固两相流。通过国内外学者六十多年的研究,在风雪流的运动特性、垂直分布规律以及输运规律、雪粒子的物理性质等方面取得了一系列研究成果,基础理论研究日趋成熟,提出了湍流扩散理论。在风雪流数值模拟方面,提出了FLOW-3D、CFD(Fluent)、IAP94、SNOWPACK等一些模型和软件。由于数值模拟工作开展较晚,建立的模型和开发的相关软件还不够完善。气-固两相流理论模拟没有考虑雪的物理性质随时间和环境的变化,模型总体比较简单,难以直接用来分析复杂地区风雪流灾害的规律。今后气-固两相流理论和多场耦合理论应该是风雪流研究的重难点,进一步开发适应复杂地区的、精度更高的专业软件,加强灾害评价方法的研究与应用。

Snow-drift is not a typical gas-solid two-phase flow. It has been studied about 60 years at home and abroad. A series of research a- chievements have been obtained in motion characteristics, vertical distributing and transports rule, physical property of snow particle etc. Turbulent Diffusion theory is put forward with the maturity of the basic theory research. Numerical simulation of snow-drift have made FLOW-3D, C FD （ Fluent）, IAP94, SNOWPACK, and some other models and software. This, however, is not perfect because of late developing. Theoretical simulation of gas-solid two-phase flow doesn＇t consider the change with time and external conditions. Being simple,the model is difficult to analysis snow-drift disaster in complicated area. Gas-solid two-phase flow theory and multi-field coupling theory are the research emphasis in future, soft wares adapt to complicated areas should be further development high-precision, and strengthening disaster assessment method research and application.