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sungjen

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[求助] 关于outcar中的受力的设置

想知道INCAR中的哪些参数设置影响到OUTCAR中的原子受力,求高手指点
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sungjen

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2楼: Originally posted by identation at 2013-09-06 11:57:49
ISIF=3
http://cms.mpi.univie.ac.at/vasp/guide/node112.html
7.21 ISIF-tag
  




Default   
if IBRION=0 (MD)  0  
else  2  


ISIF controls whether the stress tensor is calculated. The c ...

3楼2013-09-06 14:00:38
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identation

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【答案】应助回帖

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感谢参与,应助指数 +1
sunyang1988: 金币+1, 谢谢交流 2013-09-06 15:29:31
ISIF=3
http://cms.mpi.univie.ac.at/vasp/guide/node112.html
7.21 ISIF-tag
  




Default   
if IBRION=0 (MD)  0  
else  2  


ISIF controls whether the stress tensor is calculated. The calculation of the stress tensor is relatively time-consuming, and therefore by default switched off for ab initio MD's. Forces are always calculated.

In addition ISIF determines which degrees of freedom (ions, cell volume, cell shape) are allowed to change.

The following table shows the meaning of ISIF. At the moment cell changes are only supported for relaxations and nor fot molecular dynamics simulations.

ISIF calculate calculate  relax  change  change  
force  stress tensor  ions  cell shape  cell volume
0  yes  no  yes  no  no  
1  yes  trace only   yes  no  no  
2  yes  yes  yes  no  no  
3  yes  yes  yes  yes  yes
4  yes  yes  yes  yes  no  
5  yes  yes  no  yes  no  
6  yes  yes  no  yes  yes
7  yes  yes  no  no  yes
      


Trace only means that only the total pressure, i.e. the line

external pressure =      ... kB
is correct. The individual components of the stress tensor are not reliable in that case. This switch must be used with caution. Mind: Before you perform relaxations in which the volume or the cell shape is allowed to change you must read and understand section 9.6. In general volume changes should be done only with a slightly increased energy cutoff (i.e. ENCUT=1.3 * default value, or PREC=High in vasp.4.4).
2楼2013-09-06 11:57:49
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