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kehan_1230

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[交流] 刚体体系的温度计算

lammps早期的手册里在fix rigid命令部分有这样一段关于刚体体系温度计算的说明:
...For linear rigid bodies of three or more atoms, one additonal degree-of-freedom must be subtracted manually using the compute_modify command. E.g. for a simulation of 10 such rigid bodies, use"compute_modify thermo_temp extra 13", after the thermo_style command, where 3 is the default seeting and an additional 10 degrees-of-freedom are subtracted.
我有几个问题:
(1)减去自由度的原因(看了手册,不是很明白。很惭愧,物理知识薄弱。。。);
(2)每一个线性刚体分子要减去的这一个自由度代表的是哪个自由度?如果是其他形状呢,比如sphere、cylinder、disk刚体分子又该减去多少?
(3)如果体系中还包括不是刚体的组分,在统计压力减自由度时是不是只用考虑刚体分子就行?
请各位指点。。。
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