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xiewenze

木虫 (正式写手)

[求助] 关于“total drift”的问题 已有1人参与

请教“total drift”的具体含义是什么,手册上好像只是说平移不应该超过力的量级,但是具体指什么呢?貌似不是各原子受力之和吧?
另外在加电场设置EFIELD=-0.1之后,各原子受力基本小于设置的0.02,但是 total drift:     0.000000      0.000034     22.389318  
这里z方向平移怎么会这么大?
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xiewenze

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2楼: Originally posted by mywai520 at 2014-04-30 22:20:12
Another important hint that the wrap around errors are too large is given by the forces. If there is a considerable drift in the forces, increase the FFT-mesh. Search for the string 'total drift' in  ...

谢谢您!这是手册上的原文,看的不是很懂。请问z方向的偏移是由于加电场被拉长的吗?
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3楼2014-04-30 22:33:48
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mywai520

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xiewenze: 金币+3 2014-04-30 22:34:01
Another important hint that the wrap around errors are too large is given by the forces. If there is a considerable drift in the forces, increase the FFT-mesh. Search for the string 'total drift' in the OUTCAR file, it is located beneath the line TOTAL-FORCE:
total drift: -.00273 -.01048 .03856

The drift should definitely not exceed the magnitude of the forces, in general it should be smaller than the size of the forces you are interested in (usually 0.1 eV/$ .AA$).
2楼2014-04-30 22:20:12
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