Numerical Modeling of Free Surface Dynamics of Melt in an Alternate Electromagnetic Field. Part II: Conventional Electromagnetic Levitation

Numerical Modeling of Free Surface Dynamics of Melt in an Alternate Electromagnetic Field. Part II: Conventional Electromagnetic Levitation
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DOI：
10.1007/s11663-015-0515-7
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发表时间：
2016-02
期刊：
Metallurgical and Materials Transactions B
影响因子：
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通讯作者：
S. Spitans;E. Baake;B. Nacke;A. Jakovičs
S. Spitans;E. Baake;B. Nacke;A. Jakovičs
中科院分区：
其他
文献类型：
--
作者：
S. Spitans;E. Baake;B. Nacke;A. Jakovičs

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本文第一部分通过ANSYS中电磁场与FLUENT中流体动力学问题的外部耦合，建立了交变电磁场作用下液态金属自由表面流动的数值模型，并采用VOF算法对自由表面进行了跟踪。在这项工作中，提出了改进的性能的模型。一般验证theVOF算法进行比较计算的自由振荡的液柱，其解析解。本文首次将大涡模拟湍流描述的电磁场与自由表面流场耦合的3D/VOF计算方法应用于常规电磁悬浮的建模。计算结果与采用精度较低的k-ε和k-ω SST湍流公式的2D/VOF和3D/VOF模式进行了比较。获得的时间平均液滴形状用于单相流计算与不同的湍流模型和自由滑移/无滑移速度条件下，在固定的自由表面的流动验证。同时，进行了一系列的悬浮熔化实验，以验证模拟的熔滴形状。最后，讨论了参数对充分发展流动和悬浮液滴形状的影响。
By means of external coupling between electromagnetic (EM) problem inANSYSand hydrodynamic problem inFLUENT, a numerical model for the liquid metal free surface flow in an alternate EM field has been developed and verified in the first part of the article.Volume of Fluid(VOF) algorithm has been used for tracking of free surface. In this work, improved performance of the model is presented. General validation of theVOFalgorithm is performed by comparison of the calculated free oscillations of the liquid column to its analytical solution. The 3D/VOFcalculation of coupled EM field and free surface flow withLarge Eddy Simulationturbulence description for the first time is applied for modeling of conventional EM levitation. Calculation results are compared with 2D/VOFand 3D/VOFmodels that use less precisek–εandk–ω SSTturbulence formulations. Obtained time-averaged droplet shapes are used for single-phase flow calculations with different turbulence models and free-slip/no-slip velocity conditions at the fixed free surface for validation of the flow. Meanwhile, series of levitation melting experiments are performed for verification of the simulated droplet shapes. In conclusion, parameter impact on the fully developed flow and the levitated droplet shape is discussed.