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有个疑问，颗粒的随机碰撞是parcel与parcel之间进行碰撞还是particle与particle之间进行碰撞，亦或者是parcel内部particle之间进行碰撞
@tens 在 关于颗粒碰撞模型的的问题 中说：
parcel与parcel之间
盲猜是parcel与parcel之间
parcel。parcel守恒，然后改变particle数
