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xiaomizz22

银虫 (小有名气)

[交流] 【讨论】优化时出现ZBRENT错误

我在用vasp优化时出现ZBRENT: interpolating和 ZBRENT: bisectioning两种错误
如果我继续优化下去能收敛吗,最后优化的结果可行吗?
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huangyc

木虫 (正式写手)

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qasd(金币+2,VIP+0):xiexie 11-16 21:38
可信,放心做吧

what does "ZBRENT" mean?
ZBRENT is an algorithm search for a root of a function by Brent's method: Numerical recipies, Section 9.3
The problem in your case might be that the Conjugate Gradient algorithm (IBRION=2) is not suitable for very small corrections of the atomic positions if your system has almost reached equilibrium (please have a look at XDATCAR to check the size of the relaxation steps done before the ZBRENT warnings show up). Usually it is sufficient to converge a system up to maximum remaining forces of about 0.01eV/A (EDIFFG=-0.01).
please try one of the following:
1) choose a different algorithm for ionic optimization (IBRION=1)
2) set ADDGRID=.True. in INCAR (only for vasp releases 4.4.5 and newer)
2楼2009-11-15 22:40:48
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xiaomizz22

银虫 (小有名气)

我优化最后呈现如下:
40 F= -.40852330E+03 E0= -.40852330E+03  d E =0.904644E-02
curvature:   0.00 expect dE= 0.000E+00 dE for cont linesearch  0.000E+00
ZBRENT: fatal internal in brackting
         system-shutdown; contact gK immediately
You have new mail in /var/spool/mail/root

这是什么意思啊,
ZBRENT: fatal internal in brackting
system-shutdown; contact gK immediately

这两个是说明有错误吗?
3楼2009-11-16 15:33:56
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