中文摘要：

应用混合Langrangian和Eulerian法（MiLE）实现了结晶器中GCr15钢大方坯温度场、应力场及流场的动态模拟，模拟结果与实际生产铸坯吻合．铸坯坯壳角部的温度高于中部，铸坯表面从上到下的温度总体呈下降趋势，且等温区间与流场变化具有一定的相似性．铸坯坯壳中部厚度约为17．5mm，角部厚度约为13．2mm．凝固坯壳内的应力主要是热应力．坯壳出结晶器时，坯壳外表面处于压缩状态，凝固前沿为完全拉伸状态．有效应变从铸坯外表面到凝固前沿逐渐增大．钢液在前进过程中不断扩张，流速不断降低，当流股到达一定深度后，形成左右对称向上的两个回流，和一对由凝固面一侧向下而由中心向上流动的回流区．

英文摘要：

The temperature, stress and flow distribution of a bloom in GCr15 steel were simulated based on a mixed Lagrangian-Eulerian method, and the simulated results are consistent with practical blooms. The corner temperature of the bloom shell is higher than the middle parts. The tendency of the bloom surface temperature from top to bottom decreases gradually. Moreover, the isothermal zones are similar to the change of flow fields. The middle thickness of the casting bloom shell is about 17.5 mm, and the corner thickness is about 13.2 mm. The stress in the solidification shell is mainly thermal stress. When the shell is just out of the mold, the outer surface is in a compression state, while the front of solidification is in a completely tensile state. The effective strain increases from the outer surface to the front step by step. The liquid steel expands and its velocity decreases gradually in the progress. When the flow arrives to a certain depth, there are two symmetric upward backflows and a backflow area is formed by the side of face solidification downward and the centre upward.