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frank_zhan金虫 (正式写手)
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[求助]
求助,对于未relax的结构测试ecutwfc时不收敛
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请教各位虫友,我要计算一个(13,0)的碳纳米管上修饰10个金原子,我建了一个很大的胞,减小径向的image。在轴向是周期性的。 在没有做relax之前,我先用scf来测试ecutwfc取值的收敛性,但是我选用ecutwfc=30D0, ecutrho=300.D0,计算了100不步后,发现不收敛啊。 代码下: &control calculation = 'scf' restart_mode= 'from_scratch' prefix= 'SWNT-Au' tstress = .true. tprnfor = .true. pseudo_dir = '/home/zhan0273/espresso-4.1.2/pseudo', outdir= '/scratch/zhan0273/PWSCF/CNT/tmp' / &system ibrav = 8, celldm(1) = 39.6842, celldm(2) = 1.1904, celldm(3) = 0.8778, nat = 217, ntyp = 2, ecutwfc = 30.D0, ecutrho=300.D0, occupations= 'smearing', smearing= 'fd', degauss=0.02D0 / &electrons mixing_mode = 'plain' mixing_beta = 0.7 conv_thr = 1.0d-7 / ATOMIC_SPECIES C 12.0107 C.pbe-rrkjus.UPF Au 196.966 Au.pbe-nd-rrkjus.UPF ATOMIC_POSITIONS {bohr} C 28.6714 26.2825 0.6743 C 29.2262 24.0316 4.6994 C 29.2262 24.0316 7.3828 C 26.0568 30.0705 0.6743 C 28.6714 26.2825 3.3577 C 27.594 28.3352 4.6994 C 27.594 28.3352 7.3828 C 21.9813 32.2094 0.6743 C 26.0568 30.0705 3.3577 C 24.1489 31.3874 4.6994 C 24.1489 31.3874 7.3828 C 17.3786 32.2094 0.6743 C 21.9813 32.2094 3.3577 C 19.6799 32.4889 4.6994 C 19.6799 32.4889 7.3828 C 13.3031 30.0705 0.6743 C 17.3786 32.2094 3.3577 C 15.211 31.3874 4.6994 C 15.211 31.3874 7.3828 C 10.6885 26.2825 0.6743 C 13.3031 30.0705 3.3577 C 11.7658 28.3352 4.6994 C 11.7658 28.3352 7.3828 C 10.1337 21.7134 0.6743 C 10.6885 26.2825 3.3577 C 10.1337 24.0316 4.6994 C 10.1337 24.0316 7.3828 C 11.7658 17.4098 0.6743 C 10.1337 21.7134 3.3577 C 10.6885 19.4625 4.6994 C 10.6885 19.4625 7.3828 C 15.211 14.3576 0.6743 C 11.7658 17.4098 3.3577 C 13.3031 15.6746 4.6994 C 13.3031 15.6746 7.3828 C 19.6799 13.2561 0.6743 C 15.211 14.3576 3.3577 C 17.3786 13.5356 4.6994 C 17.3786 13.5356 7.3828 C 24.1489 14.3576 0.6743 C 19.6799 13.2561 3.3577 C 21.9813 13.5356 4.6994 C 21.9813 13.5356 7.3828 C 27.594 17.4098 0.6743 C 24.1489 14.3576 3.3577 C 26.0568 15.6746 4.6994 C 26.0568 15.6746 7.3828 C 29.2262 21.7134 0.6743 C 27.594 17.4098 3.3577 C 28.6714 19.4625 4.6994 C 28.6714 19.4625 7.3828 C 29.2262 21.7134 3.3577 C 28.6714 26.2825 8.7245 C 29.2262 24.0316 12.7497 C 29.2262 24.0316 15.4331 C 26.0568 30.0705 8.7245 C 28.6714 26.2825 11.408 C 27.594 28.3352 12.7497 C 27.594 28.3352 15.4331 C 21.9813 32.2094 8.7245 C 26.0568 30.0705 11.408 C 24.1489 31.3874 12.7497 C 24.1489 31.3874 15.4331 C 17.3786 32.2094 8.7245 C 21.9813 32.2094 11.408 C 19.6799 32.4889 12.7497 C 19.6799 32.4889 15.4331 C 13.3031 30.0705 8.7245 C 17.3786 32.2094 11.408 C 15.211 31.3874 12.7497 C 15.211 31.3874 15.4331 C 10.6885 26.2825 8.7245 C 13.3031 30.0705 11.408 C 11.7658 28.3352 12.7497 C 11.7658 28.3352 15.4331 C 10.1337 21.7134 8.7245 C 10.6885 26.2825 11.408 C 10.1337 24.0316 12.7497 C 10.1337 24.0316 15.4331 C 11.7658 17.4098 8.7245 C 10.1337 21.7134 11.408 C 10.6885 19.4625 12.7497 C 10.6885 19.4625 15.4331 C 15.211 14.3576 8.7245 C 11.7658 17.4098 11.408 C 13.3031 15.6746 12.7497 C 13.3031 15.6746 15.4331 C 19.6799 13.2561 8.7245 C 15.211 14.3576 11.408 C 17.3786 13.5356 12.7497 C 17.3786 13.5356 15.4331 C 24.1489 14.3576 8.7245 C 19.6799 13.2561 11.408 C 21.9813 13.5356 12.7497 C 21.9813 13.5356 15.4331 C 27.594 17.4098 8.7245 C 24.1489 14.3576 11.408 C 26.0568 15.6746 12.7497 C 26.0568 15.6746 15.4331 C 29.2262 21.7134 8.7245 C 27.594 17.4098 11.408 C 28.6714 19.4625 12.7497 C 28.6714 19.4625 15.4331 C 29.2262 21.7134 11.408 C 28.6714 26.2825 16.7748 C 29.2262 24.0316 20.7999 C 29.2262 24.0316 23.4833 C 26.0568 30.0705 16.7748 C 28.6714 26.2825 19.4582 C 27.594 28.3352 20.7999 C 27.594 28.3352 23.4833 C 26.0568 30.0705 19.4582 C 24.1489 31.3874 20.7999 C 24.1489 31.3874 23.4833 C 17.3786 32.2094 16.7748 C 21.9813 32.2094 19.4582 C 19.6799 32.4889 20.7999 C 19.6799 32.4889 23.4833 C 13.3031 30.0705 16.7748 C 17.3786 32.2094 19.4582 C 15.211 31.3874 20.7999 C 15.211 31.3874 23.4833 C 10.6885 26.2825 16.7748 C 13.3031 30.0705 19.4582 C 11.7658 28.3352 20.7999 C 11.7658 28.3352 23.4833 C 10.1337 21.7134 16.7748 C 10.6885 26.2825 19.4582 C 10.1337 24.0316 20.7999 C 10.1337 24.0316 23.4833 C 11.7658 17.4098 16.7748 C 10.1337 21.7134 19.4582 C 10.6885 19.4625 20.7999 C 10.6885 19.4625 23.4833 C 15.211 14.3576 16.7748 C 11.7658 17.4098 19.4582 C 13.3031 15.6746 20.7999 C 13.3031 15.6746 23.4833 C 19.6799 13.2561 16.7748 C 15.211 14.3576 19.4582 C 17.3786 13.5356 20.7999 C 17.3786 13.5356 23.4833 C 24.1489 14.3576 16.7748 C 19.6799 13.2561 19.4582 C 21.9813 13.5356 20.7999 C 21.9813 13.5356 23.4833 C 27.594 17.4098 16.7748 C 24.1489 14.3576 19.4582 C 26.0568 15.6746 20.7999 C 26.0568 15.6746 23.4833 C 29.2262 21.7134 16.7748 C 27.594 17.4098 19.4582 C 28.6714 19.4625 20.7999 C 28.6714 19.4625 23.4833 C 29.2262 21.7134 19.4582 C 28.6714 26.2825 24.825 C 29.2262 24.0316 28.8501 C 29.2262 24.0316 31.5335 C 26.0568 30.0705 24.825 C 28.6714 26.2825 27.5084 C 27.594 28.3352 28.8501 C 27.594 28.3352 31.5335 C 21.9813 32.2094 24.825 C 26.0568 30.0705 27.5084 C 24.1489 31.3874 28.8501 C 24.1489 31.3874 31.5335 C 17.3786 32.2094 24.825 C 21.9813 32.2094 27.5084 C 19.6799 32.4889 28.8501 C 19.6799 32.4889 31.5335 C 13.3031 30.0705 24.825 C 17.3786 32.2094 27.5084 C 15.211 31.3874 28.8501 C 15.211 31.3874 31.5335 C 10.6885 26.2825 24.825 C 13.3031 30.0705 27.5084 C 11.7658 28.3352 28.8501 C 11.7658 28.3352 31.5335 C 10.1337 21.7134 24.825 C 10.6885 26.2825 27.5084 C 10.1337 24.0316 28.8501 C 10.1337 24.0316 31.5335 C 11.7658 17.4098 24.825 C 10.1337 21.7134 27.5084 C 10.6885 19.4625 28.8501 C 10.6885 19.4625 31.5335 C 15.211 14.3576 24.825 C 11.7658 17.4098 27.5084 C 13.3031 15.6746 28.8501 C 13.3031 15.6746 31.5335 C 19.6799 13.2561 24.825 C 15.211 14.3576 27.5084 C 17.3786 13.5356 28.8501 C 17.3786 13.5356 31.5335 C 24.1489 14.3576 24.825 C 19.6799 13.2561 27.5084 C 21.9813 13.5356 28.8501 C 21.9813 13.5356 31.5335 C 27.594 17.4098 24.825 C 24.1489 14.3576 27.5084 C 26.0568 15.6746 28.8501 C 26.0568 15.6746 31.5335 C 29.2262 21.7134 24.825 C 27.594 17.4098 27.5084 C 28.6714 19.4625 28.8501 C 28.6714 19.4625 31.5335 C 29.2262 21.7134 27.5084 Au 22.3609 34.5351 17.2871 Au 25.1602 37.8218 17.9816 Au 21.3376 38.6366 18.3464 Au 23.0098 37.9754 15.0892 Au 23.5247 41.8599 12.567 Au 19.6975 42.3466 19.4269 Au 28.4041 41.327 20.0947 Au 23.9107 42.0014 20.0721 Au 21.1661 42.1764 16.0619 Au 25.7285 41.9286 16.0269 K_POINTS {Gamma} 最后的结果很奇怪: Parallel version (MPI) Number of processors in use: 16 R & G space division: proc/pool = 16 For Norm-Conserving or Ultrasoft (Vanderbilt) Pseudopotentials or PAW Current dimensions of program pwscf are: Max number of different atomic species (ntypx) = 10 Max number of k-points (npk) = 40000 Max angular momentum in pseudopotentials (lmaxx) = 3 Waiting for input... file C.pbe-rrkjus.UPF: wavefunction(s) 2S 2P renormalized gamma-point specific algorithms are used Subspace diagonalization in iterative solution of the eigenvalue problem: a parallel distributed memory algorithm will be used, eigenstates matrixes will be distributed block like on ortho sub-group = 4* 4 procs Planes per process (thick) : nr3 =200 npp = 13 ncplane =60750 Planes per process (smooth): nr3s=125 npps= 8 ncplanes=25920 bravais-lattice index = 8 lattice parameter (a_0) = 39.6842 a.u. unit-cell volume = 65304.2406 (a.u.)^3 number of atoms/cell = 217 number of atomic types = 2 number of electrons = 938.00 number of Kohn-Sham states= 563 kinetic-energy cutoff = 30.0000 Ry charge density cutoff = 300.0000 Ry convergence threshold = 1.0E-07 mixing beta = 0.7000 number of iterations used = 8 plain mixing Exchange-correlation = SLA PW PBE PBE (1434) celldm(1)= 39.684200 celldm(2)= 1.190400 celldm(3)= 0.877800 celldm(4)= 0.000000 celldm(5)= 0.000000 celldm(6)= 0.000000 crystal axes: (cart. coord. in units of a_0) a(1) = ( 1.000000 0.000000 0.000000 ) a(2) = ( 0.000000 1.190400 0.000000 ) a(3) = ( 0.000000 0.000000 0.877800 ) reciprocal axes: (cart. coord. in units 2 pi/a_0) b(1) = ( 1.000000 0.000000 0.000000 ) b(2) = ( 0.000000 0.840054 0.000000 ) b(3) = ( 0.000000 0.000000 1.139212 ) PseudoPot. # 1 for C read from file C.pbe-rrkjus.UPF Pseudo is Ultrasoft, Zval = 4.0 Generated by new atomic code, or converted to UPF format Using radial grid of 627 points, 4 beta functions with: l(1) = 0 l(2) = 0 l(3) = 1 l(4) = 1 Q(r) pseudized with 0 coefficients PseudoPot. # 2 for Au read from file Au.pbe-nd-rrkjus.UPF Pseudo is Ultrasoft + core correction, Zval = 11.0 Generated by new atomic code, or converted to UPF format Using radial grid of 1279 points, 3 beta functions with: l(1) = 2 l(2) = 2 l(3) = 1 Q(r) pseudized with 0 coefficients atomic species valence mass pseudopotential C 4.00 12.01070 C ( 1.00) Au 11.00 196.96600 Au( 1.00) ............... Self-consistent Calculation iteration # 1 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 2.0 negative rho (up, down): 0.993E-03 0.000E+00 total cpu time spent up to now is 1113.87 secs total energy = -2977.22341292 Ry Harris-Foulkes estimate = -3236.40939116 Ry estimated scf accuracy < 294.26077390 Ry iteration # 2 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 12.0 negative rho (up, down): 0.117E+00 0.000E+00 total cpu time spent up to now is 3979.61 secs total energy = -497.62887573 Ry Harris-Foulkes estimate = -6586.82676250 Ry estimated scf accuracy < 87542.15719839 Ry iteration # 3 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 11.0 negative rho (up, down): 0.697E-01 0.000E+00 total cpu time spent up to now is 6846.40 secs total energy = -3156.18188028 Ry Harris-Foulkes estimate = -3287.62595780 Ry estimated scf accuracy < 875.21197632 Ry iteration # 4 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 6.0 negative rho (up, down): 0.253E-01 0.000E+00 total cpu time spent up to now is 7879.45 secs total energy = -3203.59796421 Ry Harris-Foulkes estimate = -3241.65719464 Ry estimated scf accuracy < 224.69123842 Ry iteration # 5 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 4.0 negative rho (up, down): 0.200E-01 0.000E+00 total cpu time spent up to now is 8442.13 secs total energy = -3215.43269596 Ry Harris-Foulkes estimate = -3229.12440698 Ry estimated scf accuracy < 103.54941645 Ry iteration # 6 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 2.0 negative rho (up, down): 0.157E-01 0.000E+00 total cpu time spent up to now is 8955.15 secs total energy = -3217.71950617 Ry Harris-Foulkes estimate = -3227.87637503 Ry estimated scf accuracy < 104.30799301 Ry iteration # 7 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.00E-02, avg # of iterations = 2.0 negative rho (up, down): 0.108E-01 0.000E+00 total cpu time spent up to now is 9481.27 secs total energy = -3218.72993801 Ry Harris-Foulkes estimate = -3224.43398830 Ry estimated scf accuracy < 40.06120485 Ry iteration # 8 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 4.27E-03, avg # of iterations = 2.0 negative rho (up, down): 0.121E-01 0.000E+00 total cpu time spent up to now is 9990.08 secs total energy = -3219.49626617 Ry Harris-Foulkes estimate = -3224.58195503 Ry estimated scf accuracy < 41.17142700 Ry iteration # 9 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 4.27E-03, avg # of iterations = 2.0 negative rho (up, down): 0.485E-01 0.000E+00 total cpu time spent up to now is 10515.47 secs total energy = -3219.48018063 Ry Harris-Foulkes estimate = -3223.40913785 Ry estimated scf accuracy < 31.70397119 Ry iteration # 10 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 3.38E-03, avg # of iterations = 1.0 negative rho (up, down): 0.143E+00 0.000E+00 total cpu time spent up to now is 11035.10 secs total energy = -3219.58368562 Ry Harris-Foulkes estimate = -3224.09297601 Ry estimated scf accuracy < 58.18087981 Ry iteration # 11 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 3.38E-03, avg # of iterations = 1.0 negative rho (up, down): 0.715E-01 0.000E+00 total cpu time spent up to now is 11549.73 secs total energy = -3220.88759528 Ry Harris-Foulkes estimate = -3222.28928438 Ry estimated scf accuracy < 10.40542082 Ry iteration # 12 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.11E-03, avg # of iterations = 5.0 negative rho (up, down): 0.112E-01 0.000E+00 total cpu time spent up to now is 12101.65 secs total energy = -3220.64662380 Ry Harris-Foulkes estimate = -3222.30862685 Ry estimated scf accuracy < 13.50569556 Ry iteration # 13 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 1.11E-03, avg # of iterations = 6.0 negative rho (up, down): 0.132E-01 0.000E+00 total cpu time spent up to now is 12649.82 secs total energy = -3221.07090471 Ry Harris-Foulkes estimate = -3222.30118620 Ry estimated scf accuracy < 9.17029961 Ry iteration # 14 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 9.78E-04, avg # of iterations = 3.0 negative rho (up, down): 0.981E-02 0.000E+00 total cpu time spent up to now is 13178.03 secs total energy = -3221.34879009 Ry Harris-Foulkes estimate = -3222.07646819 Ry estimated scf accuracy < 5.92444643 Ry iteration # 15 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 6.32E-04, avg # of iterations = 1.0 negative rho (up, down): 0.625E-02 0.000E+00 total cpu time spent up to now is 13703.17 secs total energy = -3221.56124590 Ry Harris-Foulkes estimate = -3221.83904556 Ry estimated scf accuracy < 3.21641224 Ry .............. (省略中间迭代结果) ............. iteration # 96 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap WARNING: 1 eigenvalues not converged c_bands: 1 eigenvalues not converged ethr = 5.53E-06, avg # of iterations = 20.0 negative rho (up, down): 0.208E-01 0.000E+00 total cpu time spent up to now is 90461.17 secs total energy = -3217.77281804 Ry Harris-Foulkes estimate = -3226.66977913 Ry estimated scf accuracy < 81.38309144 Ry iteration # 97 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap WARNING: 1 eigenvalues not converged c_bands: 1 eigenvalues not converged ethr = 5.53E-06, avg # of iterations = 20.0 negative rho (up, down): 0.299E-01 0.000E+00 total cpu time spent up to now is 92155.74 secs total energy = -3211.79720560 Ry Harris-Foulkes estimate = -3230.89684691 Ry estimated scf accuracy < 267.53665710 Ry iteration # 98 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 5.53E-06, avg # of iterations = 18.0 negative rho (up, down): 0.251E-01 0.000E+00 total cpu time spent up to now is 93694.72 secs total energy = -3217.68647998 Ry Harris-Foulkes estimate = -3226.58151504 Ry estimated scf accuracy < 78.81725327 Ry iteration # 99 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 5.53E-06, avg # of iterations = 18.0 negative rho (up, down): 0.299E-01 0.000E+00 total cpu time spent up to now is 95407.43 secs total energy = -3214.38628245 Ry Harris-Foulkes estimate = -3232.15352793 Ry estimated scf accuracy < 187.19089394 Ry iteration #100 ecut= 30.00 Ry beta=0.70 Davidson diagonalization with overlap ethr = 5.53E-06, avg # of iterations = 19.0 negative rho (up, down): 0.155E-01 0.000E+00 total cpu time spent up to now is 97155.45 secs total energy = -3219.75593714 Ry Harris-Foulkes estimate = -3223.84708261 Ry estimated scf accuracy < 30.20838506 Ry End of self-consistent calculation convergence NOT achieved after 100 iterations: stopping . 请教高手,我这个ecut应该怎么设置? [ Last edited by frank_zhan on 2012-7-1 at 17:06 ] |
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frank_zhan
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2楼2012-07-01 17:07:26
szdtzjz
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【答案】应助回帖
★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
frank_zhan: 金币+5, ★有帮助, 谢谢回复,我先试试。 2012-07-02 09:48:49
WDD880227: 金币+1, 多谢指教 2012-07-02 10:19:41
感谢参与,应助指数 +1
frank_zhan: 金币+5, ★有帮助, 谢谢回复,我先试试。 2012-07-02 09:48:49
WDD880227: 金币+1, 多谢指教 2012-07-02 10:19:41
|
减小mixing_beta的值,取0.1~0.3试试看,并且可以把electron_maxstep改小一点,比如20步,先看看收敛的情况怎样。如果好的话,就把restart_mode改成“restart”让它接着算;如果收敛太慢,就提高一下mixing_beta,再restart;如果estimated scf accuracy震荡还是很严重,就再减小一下electron_maxstep,再restart。 如果还是不行,可以用nbnd,增加几条空能带,也会好一点。 这个收敛的问题,在PWscf的user guide里面的Frequently Asked Questions一章有讲,你可以看看。 |
3楼2012-07-01 19:11:54
frank_zhan
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4楼2012-07-02 09:49:41
szdtzjz
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5楼2012-07-02 13:44:07
frank_zhan
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6楼2012-07-05 09:51:45
goldenfisher
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7楼2012-07-05 10:58:12
frank_zhan
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8楼2012-07-07 14:43:21
goldenfisher
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9楼2012-07-31 21:57:44
huazhorg
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10楼2012-08-01 16:28:37













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