摘要：The key of the thermal-fluid coupling algorithm in temperature-control calculation of mass concrete is to simulate the convective heat transfer between the cooling water and concrete accurately. Previous simulation of convective heat transfer was realized by coupling fluid element additional nodes with the concrete nodes in the same place of pipe, namely the CP-Method. This method needs coupling nodes one by one, which was inconvenient in large-scaled simulation analysis. On this basis, we point out that the essence of CP-Method is to make the temperature at fluid element additional nodes equal to the concrete nodes in the same place and utilize the characteristic of convective heat transfer between fluid element master nodes and additional nodes. Therefore, we propose other two methods of simulating the convective heat transfer, the CPINTF-Method and NUMMRG-Method, and the rationality of the two methods is verified by a practical example. Further analysis shows that the NUMMRG-Method is the optimal one.%在混凝土冷却水管温控计算中,实现热流耦合算法的关键是准确模拟混凝土与冷却水之间的对流换热,以往的计算都是通过将混凝土在水管处节点与同一位置的流体单元附加节点逐一耦合来实现的,即CP方法,该方法需要逐一耦合节点,在大规模数值模拟中较为麻烦。为此,首先分析了CP方法模拟的本质,即先通过耦合使混凝土节点与流体单元附加节点温度一致,同时利用流体单元主节点与附加节点之间具有对流换热这一特性来实现对流换热过程的模拟。基于此,提出了另外两种模拟冷却水与混凝土之间对流换热的方法,即CPINTF和NUMMRG方法。通过一实例的对比分析,验证了以上两种方法的准确性。通过进一步分析得出,NUMMRG方法为最优方法。
