标题： Richtmyer-Meshkov不稳定性在具有密度变化的球形目标中 显示英文标题

标题： Richtmyer - Meshkov instability in a spherical target with density variation

摘要： 不稳定的流体界面由于Richtmyer-Meshkov(RM)不稳定性结合密度变化在球形目标中使用拉格朗日公式进行了研究。 在惯性约束聚变(ICF)过程中，氘-氚(DT)燃料的密度在球形目标核心内增加到气态DT燃料密度的1000倍。 我们扩展了球几何中的密度变化特性[PRA,84-Mikaelian & Lindl]。由于收敛冲击的撞击，扰动界面将变得非球形，这导致径向和极角方向的密度变化。 我们证明了扰动表面的界面随时间减少以达到最小值，然后反弹逐渐增加。 随着扰动半径的减小，密度增加并达到最大值，对应于扰动半径的最小值。 这是ICF压缩过程中密度特性的实际情况。 基于我们分析工作的数值结果与一些实验和模拟结果有良好的定性一致性。 显示英文摘要

摘要： The motion of unstable fluid interface due to Richtmyer - Meshkov (RM) instability incorporating with density variation has been studied in a spherical target using Lagrangian formulation. During the compression in Inertial Confinement Fusion (ICF)process, the density of deuterium - tritium (DT) fuel increases 1000 times greater than the density of gaseous DT fuel within the core of spherical target. We have extended the feature of density variation [PRA,84-Mikaelian & Lindl] in spherical geometry.Due to convergent shock impingement, the perturbed interface will be nonspherical which leads to the density variation in both radial as well as in polar angle. We have shown that the interface of perturbed surface decreases with time to reach a minimum and then kick back to gradual increase. As the perturbed radius decreases, the density increases and reaches a maxima corresponding to a minima of perturbed radius. This is the practical situation of density characteristics during implosion of ICF. The numerical results based on our analytical work show a good qualitative agreement with some experimental as well as simulation results.