arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2303.08946physics.plasm-ph
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超高速撞击与等离子体生成的流固耦合模拟

Fluid-Solid Coupled Simulation of Hypervelocity Impact and Plasma Formation

Shafquat T. Islam, Wentao Ma, John G. Michopoulos, Kevin Wang

AI总结:

本文提出一种流固耦合多物理场计算方法,耦合可压缩Navier-Stokes方程与Saha电离方程,模拟铜弹丸在氖气中撞击玻璃靶体的超高速撞击过程,揭示了撞击速度超过4 km/s时周围气体会发生电离。

摘要:

超高速撞击产生的等离子体因其在各类应用中具有重要的科学和工程意义,是一个活跃的研究课题。以往研究主要集中于构成弹丸和靶体的固体材料的电离。在本文中,我们考虑发生在流体(例如气体)介质中的撞击事件,并提出一种多物理场计算建模方法及相应分析,以预测导致周围流体电离的动态流固相互作用行为。所提出的计算框架被应用于一个具体案例,该案例涉及三个相互作用域组成的系统:铜杆弹丸在氖气环境中撞击钠钙玻璃靶体。在不同模拟中,撞击速度在3 km/s至6 km/s之间变化。该计算模型将可压缩无粘Navier-Stokes方程与Saha电离方程耦合。弹丸、靶体和环境气体之间形成的三个材料界面通过求解共享同一速度场的两个level set方程进行隐式跟踪。跨界面的质量、动量和能量通量采用带精确双材料Riemann问题的有限体积法(FIVER)计算。模拟结果揭示了一个具有高速度、高温度、高压力和高密度特征的氖气区域,该区域在撞击早期阶段形成,主要源于弹丸与靶体之间流体的高超声速压缩。对于高于4 km/s的撞击速度,预测该区域会发生电离。

英文摘要:

The generation of plasma from hypervelocity impacts is an active research topic due to its important science and engineering ramifications in various applications. Previous studies have mainly focused on the ionization of the solid materials that constitute the projectile and the target. In this letter, we consider impact events that occur in a fluid (e.g.,~gas) medium, and present a multiphysics computational modeling approach and associated analysis to predict the behavior of the dynamic fluid-solid interaction that causes the surrounding fluid to ionize. The proposed computational framework is applied to a specific case involving a system of three interacting domains: a copper rod projectile impacting onto a soda lime glass target in a neon gas environment. The impact velocity is varied between 3 km/s and 6 km/s in different simulations. The computational model couples the compressible inviscid Navier-Stokes equations with the Saha ionization equations. The three material interfaces formed among the projectile, the target, and the ambient gas are tracked implicitly by solving two level set equations that share the same velocity field. The mass, momentum, and energy fluxes across the interfaces are computed using the FInite Volume method with Exact two-material Riemann problems (FIVER). The simulation result reveals a region of neon gas with high velocity, temperature, pressure, and mass density, formed in the early stage of the impact mainly due to the hypersonic compression of the fluid between the projectile and the target. For impact velocities higher than 4 km/s, ionization is predicted in this region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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