Numerical Simulation of Molten Jet Breakup by Coupled Multiphase Model Based on VOF Method and Two-Fluid Model
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摘要: 针对熔融物与冷却剂相互作用(FCI)过程中多尺度相界面共存的复杂流型,将基于流体体积法(VOF)的界面跟踪模型与两流体模型耦合在一套统一的数值求解框架下,得到一个新的多相流数值模型,可以模拟大尺度界面流体与小尺度界面流体共存的复杂多相流过程。该模型中,对于动量场,流体根据界面尺度分为连续相和离散相。连续相界面通过VOF/PLIC方法进行捕捉,离散相表面积浓度分布通过表面积输运方程模拟。耦合模型的控制方程通过MCBA-SIMPLE算法求解。使用该模型对金属液柱的流动和碎化过程进行模拟,并与实验观测结果进行对比,同时还对液柱碎化速率模型和金属液滴初始直径的影响进行了探讨。结果表明:原液柱碎化模型对液柱贯穿深度有所高估;金属液滴初始直径的选择将对熔融物的冷却效率造成显著影响。Abstract: Current study couples the interface tracking model based on VOF with the two-fluid model in a unified solution framework.The new model can simulate the complex multiphase flow in which large-length-scale interface and small-length scale interface coexist.The model is a three-fluid,eight-equation model.For momentum fields,the fluid is divided into continuous phase and dispersed phase.Interface of continuous phase is tracked by VOF/PLIC method.Surface area distribution of the dispersed phase is simulated by the area transport equation.Governing equations of the new model is solved by MCBA-SIMPLE algorithm.The coupled model is applied to molten jet flow and breakup simulation.Experimental observation is used for comparison and validation.Effects of jet breakup model and initial drop diameter are also discussed in this paper.Results indicate that the original jet breakup model overestimates the jet penetration length,and the initial drop diameter affects the coolability of the melt significantly.
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Key words:
- Numerical simulation /
- Multiphase flow /
- Coupled model /
- Jet breakup
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