We investigate convection driven by induction heating of a horizontal fluid layer with direct numerical simulations (DNS). This problem is of particular interest in the context of nuclear severe accident mastering. In a real severe accident, the molten core is subjected to homogeneous internal sources resulting from nuclear disintegrations. This situation is mimicked in the laboratory using induction heating as the internal source. In induction heating however, heat sources are localized in the skin layer. Consequently, this concentration of heat may modify the flow and wall heat transfer, compared to the case of homogeneous internal sources.ududDNS are carried out for three typical skin depths and three total deposited powers. Skin depth variations show surprising results regarding flow structures and heat transfer. It is found that the heat sources heterogeneity has a weak effect on flow structures. Consequently, models of heat transfer in the case of homogeneous sources remain valid even with strong localized heating near the bottom.
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机译：我们使用直接数值模拟（DNS）研究由水平流体层的感应加热驱动的对流。在控制核严重事故方面，这个问题特别重要。在真正的严重事故中，熔融核经受核崩解产生的均匀内部源。在实验室中使用感应加热作为内部源可以模拟这种情况。然而，在感应加热中，热源位于表皮层中。因此，与均匀内部源的情况相比，这种热量集中可能会改变流动和壁的传热。 ud udDNS是针对三种典型趋肤深度和三种总沉积功率进行的。趋肤深度变化显示出与流动结构和传热有关的令人惊讶的结果。发现热源的异质性对流动结构的影响较弱。因此，即使在底部附近有强烈的局部加热的情况下，在均质热源情况下的传热模型仍然有效。
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