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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - A detailed study of bubble and spike velocities in ejecta
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - A detailed study of bubble and spike velocities in ejecta

机译：APS-流体动力学APS部门第70届年会-活动-喷射器中气泡和峰值速度的详细研究

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摘要

We use detailed continuum hydrodynamics and molecular dynamics simulations to characterize bubble and spike growth in shock-driven ejecta. Insights from the simulations are used to suggest a modified expression for the velocity associated with ejected spike structures, while a recently proposed model [1] explains the observed bubble velocities. For spikes, existing models [2] can overpredict observed spike velocities if they do not include the modification of the initial spike growth rates due to nonlinearities. Instead, we find that using the potential flow model of [2], corrected with a suitable nonlinear prefactor leads to predictions in close agreement with our simulation data. We propose a simple empirical expression for the nonlinear correction for spike velocities that is able to reproduce results from our simulations and published experimental and simulation data over a wide range of initial conditions and Mach numbers. We verify these ideas with simulations (continuum and MD) at different amplitudes, initial perturbation shapes, and shock strength. This work was supported by the Los Alamos National Laboratory.[1] K. O. Mikaelian, Phys Rev Lett 80, 508 (1998).[2] Q. Zhang, Phys Rev Lett 81, 3391 (1998).
机译：我们使用详细的连续流体动力学和分子动力学模拟来表征冲击驱动喷射中的气泡和尖峰增长。来自模拟的洞察力被用来为与喷出的尖峰结构相关的速度建议一个修正表达式，而最近提出的模型[1]解释了观察到的气泡速度。对于尖峰，如果现有模型[2]不包括由于非线性导致的初始尖峰增长率的修正，则它们可能会高估观测到的尖峰速度。取而代之的是，我们发现使用[2]的势流模型，并用适当的非线性前置因子进行校正，可以得出与我们的模拟数据非常一致的预测。我们为尖峰速度的非线性校正提出了一个简单的经验表达式，该表达式可以在广泛的初始条件和马赫数范围内重现我们的仿真结果以及已发布的实验和仿真数据。我们通过不同幅度，初始扰动形状和冲击强度的仿真（连续谱和MD）验证了这些想法。这项工作得到了洛斯阿拉莫斯国家实验室的支持。[1] K. O. Mikaelian，Phys Rev Lett 80，508（1998）。[2] Q.Zhang，Phys Rev Lett 81，3391（1998）。

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