摘要
采用高 Re数的紊流 K- ε两方程模型 ,且结合壁面函数法对薄板坯连铸结晶器中钢液的紊流流动进行了有限元数值模拟。在数值模拟中 ,考虑了凝固壳厚度分布对流场的影响。在掌握了结晶器内紊流粘性系数分布规律的基础上 ,将流动域在空间进行了分区 ,采用分区选定有效粘性系数的当量层流模型数值模拟了三维紊流流动 ,结果表明 ,当量层流模型可有效的获得与原紊流时均场基本一致的结果 ,但计算效率显著提高 ,为今后工程上计算薄板坯结晶器中的三维流动和考虑流动影响的凝固过程分析提供了实用的方法 。
The 3 dimensional molten flow in the mold of thin slab continuous casting was simulated numerically by using finite element method(FEM). The K ε turbulent model and wall function were adopted in simulation, and the influence of the solidified shell on the time averaged velocity field was considered at present paper. Based on the many calculated results about the distributions of turbulent viscosity, the flow region was divided into subregions with different effective viscosities. Then laminar equivalent model (LEM) was developed to simulate the turbulent flow in the mold and the original K ε turbulent model was replaced. It was shown that the LEM was efficient and easily obtained converged velocity field. Also, the computing time reduced to 20% as compared with K ε model.
出处
《应用力学学报》
EI
CAS
CSCD
北大核心
2000年第1期18-22,共5页
Chinese Journal of Applied Mechanics
关键词
薄板坯连铸
数值模拟
结晶器
钢液
三维流动
thin slab continuous casting, turbulent flow, finite element method, numerical simulation.
