A comparison of three-dimensional multimode hydrodynamic instability growth on various National Ignition Facility capsule designs with HYDRA simulations
A comparison of three-dimensional multimode hydrodynamic instability growth on various National Ignition Facility capsule designs with HYDRA simulations
复制标题
使用 HYDRA 模拟对各种国家点火装置胶囊设计的三维多模式流体动力学不稳定性增长进行比较
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
G. Zimmerman
中科院分区：
文献类型：
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作者：
M. Marinak;S. Haan;T. Dittrich;R. Tipton;G. Zimmerman
分析了国家点火装置的三种类似的低温点火舱设计[J.Lindl，Phys.Plasmas 2，3933（1995）]，以确定减轻流体动力学不稳定性增长所需的表面粗糙度规格。这些胶囊分别采用溴化塑料，聚酰亚胺和掺铜铍烧蚀材料。HYDROGEN辐射流体动力学程序的直接三维数值模拟[M. M. Marinak等人，物理等离子体3，2070（1996）]检查的增长的多模扰动播种粗糙度上的外部烧蚀和内部冰表面。通过点火和燃烧的模拟，显示出弱非线性行为的优化表面，进行。一个三维的多模扰动实现更大的幅度在非线性制度比相应的二维模拟相同的均方根幅度。铍和聚酰亚胺胶囊表现出增强的容忍粗糙度的冰和烧蚀表面。
Three similar cryogenic ignition capsule designs for the National Ignition Facility [J. Lindl, Phys. Plasmas 2, 3933 (1995)] are analyzed to determine surface roughness specifications required to mitigate the growth of hydrodynamic instabilities. These capsule utilize brominated plastic, polyimid and copper-doped beryllium ablator materials respectively. Direct three-dimensional numerical simulations with the HYDRA radiation hydrodynamic code [M. M. Marinak et al., Phys. Plasmas 3, 2070 (1996)] examine the growth of multimode perturbations seeded by roughness on the outer ablator and inner ice surfaces. The simulations, which showed weakly nonlinear behavior for optimized surfaces, were carried through ignition and burn. A three-dimensional multimode perturbation achieves somewhat larger amplitudes in the nonlinear regime than a corresponding two-dimensional simulation of the same rms amplitude. The beryllium and polyimid capsules exhibit enhanced tolerance of roughness on both the ice and ablator surfaces.