Z箍缩丝阵烧蚀的简单模型数值模拟

丝阵烧蚀在丝阵Z箍缩动力学中扮有重要角色，透彻理解丝阵烧蚀对于丝阵Z箍缩动力学的研究至关重要。采用简单模型数值模拟了烧蚀过程，该模型物理上采用绝热、单流体、单相、磁流体力学近似，数值上采用欧拉法结合保单调输运格式来离散。数值结果很好地展示了烧蚀过程的主要特征，例如芯-冕结构、径向等离子体流、轴线上先驱等离子体柱的形成、静止丝芯的长寿命以及延长的烧蚀期，一些关键时间参数定量或定性地相符于文献报道的实验和数值结果，例如冕等离子体角向融合的时刻、等离子体首次到达轴线的时刻、丝芯静止持续的时间、最后的箍缩滞止时刻，但某些方面略有差异。

Numerical modeling of Z-pinch wire array ablation with a simple model

A good understanding of Z-pinch wire array ablation is of critical importance to the study of the dynamics of the wire array Z-pinch. To model the ablation process, a two-dimensional (2D) magnetohydrodynamics (MHD) program called FOI has been developed. The ablation is approximated in an adiabatic single-fluid single-phase MHD framework. Eulerian computation is adopted with a monotonic advection scheme. The numerical results obtained from FOI successfully qualitatively demonstrate the primary aspects of the ablation process, such as the core-corona structure, radial plasma streams, the formation of an on-axis precursor plasma column, longevity of the stationary wire cores and the extended ablation phase, though some discrepancies are observed.