The self-similar nonlinear evolution of the multimode ablative Rayleigh–Taylor instability (RTI) and the ablation-generated vorticity effect are studied for a range of initial conditions. We show that, unlike classical RTI, the nonlinear multimode bubble-front evolution remains in the bubble competition regime due to ablation-generated vorticity, which accelerates the bubbles, thereby preventing a transition into the bubble-merger regime. We develop an analytical bubble competition model to describe the linear and nonlinear stages of ablative RTI. We show that vorticity inside the multimode bubbles is most significant at small scales with large initial perturbation. Since these small scales persist in the bubble competition regime, the self-similar growth coefficient αb can be enhanced by up to 30% relative to ablative bubble competition without vorticity effects. We use the ablative bubble competition model to explain the hydrodynamic stability boundary observed in OMEGA low-adiabat implosion experiments.

中文翻译：

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多模烧蚀瑞利-泰勒不稳定性的非线性气泡竞争及其在惯性约束聚变中的应用

在一系列初始条件下研究了多模烧蚀瑞利-泰勒不稳定性 (RTI) 的自相似非线性演化和烧蚀产生的涡度效应。我们表明，与经典 RTI 不同，非线性多模气泡前缘演化由于烧蚀产生的涡流而保持在气泡竞争状态，这会加速气泡，从而防止过渡到气泡合并状态。我们开发了一个分析气泡竞争模型来描述烧蚀 RTI 的线性和非线性阶段。我们表明，多模气泡内的涡度在初始扰动较大的小尺度上最为显着。由于这些小规模在泡沫竞争制度中持续存在，相对于没有涡度效应的烧蚀气泡竞争，自相似增长系数 αb 可以提高高达 30%。我们使用烧蚀气泡竞争模型来解释在 OMEGA 低绝热内爆实验中观察到的流体动力学稳定性边界。