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leijincheng

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[求助] LAMMPS中dihedral与improper具体有什么区别? 已有1人参与

rt,大概清楚两种都是二面角,但实在不明白这两种的区别是什么。
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brucefan

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【答案】应助回帖

感谢参与,应助指数 +1
这不是lammps问题,是力场问题。

A dihedral angle potentials depends on four consecutive bonded atoms, whereas the improper torsion depends on three atoms centered around a fourth atom. ... The main difference between both torsion potentials is the definition of the torsional angle and the functional form of the potential function.

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2楼2018-10-12 23:23:03
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brucefan

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【答案】应助回帖

上面的话来自于这个网站
http://cbio.bmt.tue.nl/pumma/index.php/Theory/Potentials

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3楼2018-10-12 23:29:02
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