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[求助] Muller-Plath模型的角动量问题

muller-plath在文献中也提到过NEMD模拟中进行的粒子交换,线动量和动能是守恒,但是角动量不守恒,因此整个体系会在交换粒子的过程中转起来,文献中是这么说的(It can be shown that exchanging the velocities of two particles of equal mass leaves the total linear momentum, the total ki-netic energy, and the total energy ~in a conservative system ! unchanged, and that velocity transfer by exchange is the only one which satisfies these conservation laws. The total angu-lar momentum, however, is not conserved. This should nor-mally not be a problem, since, except for vacuum boundary conditions, the angular momentum is anyway not a constant of motion)可是转动的话,会不会有额外的能量呢?请问高手们,此问题是怎么处理的?
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