The function of simple repulsive force used in the original DLM/FD method is not only related to the distance of two spheres but also affected by the collision parameters which are not physical.

• 原有的DLM/FD方法中采用的是简单排斥力模型，粒子不能真实接触发生碰撞，其中涉及的排斥力不仅和球心位置有关，还和一些碰撞参数有关，而这些碰撞参数并非定值，选择的数值不同，结果也有变化；