Abstract In this paper, the color-gradient lattice Boltzmann model (Saito et al., Phys. Re. E 98, 013,305, 2018) is used to study 3D hydrodynamic corium jet breakup and fragmentation in sodium. Firstly, an in-house GPU-accelerated color-gradient lattice Boltzmann solver is introduced in detail. Then, the solver is validated by comparing the simulation results with two demo Wood's metal jet experiments. Finally, the solver is used to study the characteristics and mechanisms of molten corium jet breakup and fragmentation in sodium under severe accident scenarios in a sodium-cooled fast reactor. The corium jet morphologies, breakup and fragmentation mechanisms, penetration depth, breakup length and fragment size distribution are extensively studied.

中文翻译：

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用 GPU 加速的颜色梯度格子 Boltzmann 求解器研究钠中的真皮射流破碎和碎裂

摘要 在本文中，颜色梯度晶格 Boltzmann 模型 (Saito et al., Phys. Re. E 98, 013,305, 2018) 用于研究钠中 3D 流体动力学的真皮射流破裂和碎裂。首先，详细介绍了内部 GPU 加速的颜色梯度格子 Boltzmann 求解器。然后，通过将模拟结果与两个演示伍德的金属喷射实验进行比较来验证求解器。最后，利用求解器研究了钠冷快堆严重事故情景下熔融钄射流在钠中的破裂和碎裂的特性和机制。对真皮射流形态、破碎和破碎机制、穿透深度、破碎长度和碎片尺寸分布进行了广泛研究。