Nonlinear interaction between bulk point vortices and the interface in the incompressible Richtmyer-Meshkov instability (RMI) is investigated theoretically and numerically. When the strength of point vortices are large enough, they interact with the original vorticity existing on the vortex sheet and create new vortex cores. These vortex cores roll up like mushrooms, and a very complicated interfacial structure is formed at the final stage. It is shown that satellite bubbles and spikes are created in the neighborhood of original bubbles and spikes when bulk point vortices approach the interface. The shape of an interface is largely deformed by the existence of bulk point vortices; however, the asymptotic growth rate of the bubble and spike is almost the same as the one for pure RMI without point vortices.

从理论上和数值上研究了不可压缩的Richtmyer-Meshkov不稳定性（RMI）中体点涡旋与界面之间的非线性相互作用。当点旋涡的强度足够大时，它们会与存在于旋涡片上的原始旋涡相互作用并创建新的旋涡芯。这些涡流核心像蘑菇一样卷起，最后阶段形成了非常复杂的界面结构。结果表明，当体积点涡旋接近界面时，在原始气泡和峰值附近产生了卫星气泡和峰值。界面的形状由于存在大量点涡而大大变形。然而，气泡和尖峰的渐近增长率几乎与没有点涡的纯RMI的渐近增长率相同。