Studies of macroscopic melt motion induced by fast transient power loads and the ensuing damage to plasma-facing components are critical for ITER. Based on state-of-the-art experiments, heat transfer is argued to be strongly entangled with fluid dynamics. The physics model of the MEMOS-U code is introduced. Simulations are reported of recent tokamak experiments concerning deliberate transient melting of beryllium main chamber tiles (JET) and tungsten divertor components (ASDEX Upgrade, JET). MEMOS-U is demonstrated to capture the main physics responsible for melt dynamics and to reproduce the observed surface deformation. The intricate role of resolidification is elucidated.

中文翻译：

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快速瞬态托卡马克等离子体负荷下由再凝固控制的熔体动力学

对快速瞬态功率负载引起的宏观熔体运动以及随之而来的对等离子体部件的损坏的研究对于ITER至关重要。基于最新的实验，传热被认为与流体动力学密切相关。介绍了MEMOS-U代码的物理模型。关于最近的托卡马克实验的模拟报告，该实验涉及铍主腔室砖（JET）和钨分流器组件的故意瞬时熔化（ASDEX升级，JET）。MEMOS-U被证明可以捕捉负责熔体动力学的主要物理现象，并再现观察到的表面变形。阐明了重组的复杂作用。