摘要
水管冷却是混凝土坝施工期的主要温度控制措施,提出一种新的水管冷却数值模拟理论和计算方法.该方法将水管置于常规混凝土单元内部,在单元中把混凝土与水管的接触面作为散热面纳入控制方程的边界条件,把混凝土通过冷却水管壁面耗散的能量叠加到常规泛函中,根据此复合泛函由变分原理建立含冷却水管混凝土的有限元支配方程.编制相应的三维计算程序,在程序中水管网格的拓扑信息由程序自动完成,冷却水管可以从混凝土单元任意位置穿过,因此不增加网格剖分的难度,算例表明该方法能准确模拟混凝土的冷却效应.
We present a method for numerical simulation of temperature field of mass concrete with cooling pipes. Cooling pipes are put in conventional concrete element. Contact surface of concrete and cooling pipes is considered as thermal surface in boundary conditions of control equation. And energy dissipating through cooling pipe walls in concrete is brought into conventional functional. A governing equation of finite element method is established for concrete containing cooling pipes with variational principle. A finite element simulation program for three-dimensional transient temperature field is designed. In the program, topology information of cooling pipe mesh can be completed automatically. Cooling pipes can cross concrete elements anywhere which does not increase difficulty of mesh generation. Numerical examples show that the method accurately simulates cooling of concrete.
出处
《计算物理》
EI
CSCD
北大核心
2012年第3期411-416,共6页
Chinese Journal of Computational Physics
关键词
数值模拟
温度控制
水管冷却
有限元
numerical simulation
temperature control
cooling pipes
finite element method
