In this work, we investigate the motion, interaction, and simultaneous collision between many initially stable vortex rings arranged symmetrically in two initial configurations, three and six rings making an angle of 60 and 120° between their straight path lines, respectively. We report results for laminar vortex rings in air obtained through numerical simulations of the ring velocity, pressure, and vorticity fields, both in free flight and during the entire collision. Each collision was studied for small Reynolds numbers Re<103 based on both the self-induced velocity and diameter of the ring. The case of three rings produces secondary vortical structures formed by laterally expanding dipolar arms with top and bottom secondary vortex rings. The case of six colliding rings produces, as secondary structures, two big rings moving in opposite directions, a process that reminds us of the head-on collision of two rings [T. T. Lim and T. B. Nickels, “Instability and reconnection in the head-on collision of two v...

中文翻译：

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多个涡环的对称碰撞

在这项工作中，我们研究了在两个初始配置中对称排列的许多初始稳定涡环之间的运动、相互作用和同时碰撞，三个和六个环在它们的直线路径之间分别形成 60 和 120° 的角度。我们报告了通过对自由飞行和整个碰撞过程中的环速度、压力和涡量场进行数值模拟获得的空气中层流涡环的结果。基于环的自诱导速度和直径，针对小雷诺数 Re<103 研究每次碰撞。三环的情况产生由带有顶部和底部次级涡环的横向扩展偶极臂形成的次级涡结构。六个碰撞环的情况产生，作为二级结构，