Transient, Multiphase Simulation of Grade Intermixing in a Tundish Under Constant Casting Rate and Validation Against Physical Modeling
Transient, Multiphase Simulation of Grade Intermixing in a Tundish Under Constant Casting Rate and Validation Against Physical Modeling
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DOI：
10.1007/s11837-018-2988-8
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发表时间：
2018-07
期刊：
影响因子：
2.6
通讯作者：
Krashnavtar;D. Mazumdar
中科院分区：
文献类型：
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作者：
Krashnavtar;D. Mazumdar
本文用数学方法模拟了连续浇注两种不同牌号的钢时，钢包内的流体力学和混合现象。这就需要对三个不同的、相互关联的操作阶段进行建模，包括稳态铸造阶段、钢包转换阶段（流入停止）和与含有不同等级钢的新钢包的混合阶段。在这些研究中，始终考虑恒定的铸造速率以准确地模拟普遍的工业实践。这是通过规定一个随时间变化的压力场，推导出一个先验的压力“预测-校正”计划的出口。相应地，开发了适当的用户定义功能，并将其集成到ANSYS Fluent™中以进行数值计算。它表明，一个瞬态的，湍流的，体积的流体计算程序，结合适当的压力校正方案，是足够的模拟工业级混合操作在恒定的铸造/吞吐率。
Hydrodynamics and mixing phenomena in a tundish, during successive casting of two dissimilar grades of steel, from two different ladles, have been modeled mathematically. This necessitated modeling of three distinct, interconnected operating stages, including the steady-state casting period, the ladle change-over period (with inflow halted) and the intermixing period with a new ladle containing a different grade of steel. In these, a constant casting rate was considered throughout to accurately mimic prevalent industrial practice. This was accomplished by prescribing a time-dependent pressure field at the tundish outlet, deduced a priori through a pressure “predictor–corrector” scheme. Accordingly, appropriate user defined functions were developed and integrated in ANSYS Fluent™ to carry out numerical calculations. It is demonstrated that a transient, turbulent, volume of fluid calculation procedure, in conjunction with an appropriate pressure correction scheme, is adequate to simulate industrial grade intermixing operation at constant casting/throughput rates.