The area is called the second Lagrangian Point.

这个区域叫做第二拉格朗日点。

One key difference of this work is that the older solution was built upon a Lagrangian approach, which means that the simulation consists of computing the velocities and the pressure that acts on these particles.

这项工作的一个主要不同点是，旧的方法是建立在拉格朗日方法的基础上，这意味着模拟方法包括计算速度和作用于这些粒子的压力。