摘要
采用改进的离散要素法(DEM)对严重事故中碎片床的形成过程进行二维数值模拟。针对传统的DEM模型中计算系数选取困难的问题,围绕时间步长对计算参数重新进行推导和组合,改进后的DEM能大大提高应用的效率。通过与一系列的实验在颗粒扩散角度、颗粒下落时间、形成碎片床的形状方面的系统对比,验证了模拟程序的有效性。
This paper presents 2-D numerical simulations using the modified discrete element method （DEM） on debris bed formation. The modified DEM facilitates the application by reorganizing the calculation parameters. A series of experiments performed by gravity driven discharge of solid particles into a quiescent water pool was used to validate the present simulation method. We made comparison of the particle dispersion angle and particle fall time in the pool, and the shape of particle bed between the experimental and simulation results. In this comparison, the general trend of simulation results indicates a reasonable agreement with the experimental observations.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2015年第5期184-186,共3页
Nuclear Power Engineering
