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justinzhouke新蟲 (初入文壇)
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[交流]
PWscf(QE)的結(jié)構(gòu)優(yōu)化問題 已有3人參與
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我在用vc-relax做結(jié)構(gòu)優(yōu)化的時候,還沒有達(dá)到應(yīng)力收斂條件的時候就退出了 The maximum number of steps has been reached. 這個怎么處理啊。 求大神幫忙。 ............ Forces acting on atoms (Ry/au): atom 1 type 1 force = 0.00000000 0.00000000 0.00000000 atom 2 type 2 force = 0.00000000 0.00000000 0.00000000 Total force = 0.000000 Total SCF correction = 0.000000 entering subroutine stress ... total stress (Ry/bohr**3) (kbar) P= -0.02 -0.00000013 -0.00000000 0.00000000 -0.02 -0.00 0.00 0.00000000 -0.00000013 -0.00000000 0.00 -0.02 -0.00 0.00000000 -0.00000000 -0.00000013 0.00 -0.00 -0.02 The maximum number of steps has been reached. End of BFGS Geometry Optimization Begin final coordinates new unit-cell volume = 337.13304 a.u.^3 ( 49.95796 Ang^3 ) CELL_PARAMETERS (alat= 11.69699086) 0.000000000 0.472261950 0.472261950 0.472261950 -0.000000000 0.472261950 0.472261950 0.472261950 -0.000000000 ATOMIC_POSITIONS (crystal) In -0.000000000 -0.000000000 0.000000000 As 0.250000000 0.250000000 0.250000000 End final coordinates ............ 輸入文件如下: &control calculation = 'vc-relax', restart_mode= 'from_scratch', pseudo_dir = './', outdir = './tmp', prefix='inas', wf_collect = .true. tstress = .true. tprnfor = .true. etot_conv_thr = 1.0D-4 forc_conv_thr = 1.0D-3 nstep = 20000 / &system ibrav= 0, celldm(1)=11.6969908603; nat= 2, ntyp= 2, ecutwfc =48, / &electrons electron_maxstep=2500 mixing_beta = 0.7 conv_thr = 5.0d-12 / &IONS ion_dynamics = 'bfgs' / &CELL cell_dynamics = 'bfgs' press=0.0 press_conv_thr = 5.0D-4 / ATOMIC_SPECIES In 111.818 In.pz-bhs.UPF As 74.920 As.pz-bhs.UPF ATOMIC_POSITIONS crystal In 0.00 0.00 0.00 As 0.25 0.25 0.25 K_POINTS automatic 9 9 9 0 0 0 CELL_PARAMETERS alat 0.000000000 0.5 0.5 0.5 -0.000000000 0.5 0.5 0.5 0.000000000 |

木蟲 (著名寫手)
新蟲 (初入文壇)
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你好, 我把press_conv_thr 改為1.0D-4和1.0D-5后,還是出現(xiàn) The maximum number of steps has been reached. 其中1.0D-5的部分輸出結(jié)果為: Forces acting on atoms (Ry/au): atom 1 type 1 force = 0.00000000 0.00000000 0.00000000 atom 2 type 2 force = 0.00000000 0.00000000 0.00000000 Total force = 0.000000 Total SCF correction = 0.000000 entering subroutine stress ... total stress (Ry/bohr**3) (kbar) P= -0.02 -0.00000013 -0.00000000 0.00000000 -0.02 -0.00 0.00 0.00000000 -0.00000013 -0.00000000 0.00 -0.02 -0.00 0.00000000 -0.00000000 -0.00000013 0.00 -0.00 -0.02 The maximum number of steps has been reached. |

木蟲 (著名寫手)
新蟲 (初入文壇)
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我改為0.1后,優(yōu)化后的結(jié)果為: Total force = 0.000000 Total SCF correction = 0.000000 entering subroutine stress ... total stress (Ry/bohr**3) (kbar) P= -0.05 -0.00000031 -0.00000000 0.00000000 -0.05 -0.00 0.00 -0.00000000 -0.00000031 0.00000000 -0.00 -0.05 0.00 0.00000000 -0.00000000 -0.00000031 0.00 -0.00 -0.05 bfgs converged in 6 scf cycles and 5 bfgs steps (criteria: energy < 0.10E-03, force < 0.10E-02, cell < 0.10E+00) End of BFGS Geometry Optimization Final enthalpy = -16.9554247603 Ry Begin final coordinates new unit-cell volume = 337.14584 a.u.^3 ( 49.95986 Ang^3 ) CELL_PARAMETERS (alat= 11.69699086) 0.000000000 0.472267929 0.472267929 0.472267929 -0.000000000 0.472267929 0.472267929 0.472267929 -0.000000000 ATOMIC_POSITIONS (crystal) In 0.000000000 0.000000000 -0.000000000 As 0.250000000 0.250000000 0.250000000 End final coordinates 沒有出現(xiàn) The maximum number of steps has been reached.可以沒有達(dá)到應(yīng)力為0. 當(dāng)我改為0.01后還是出現(xiàn) 沒有出現(xiàn) The maximum number of steps has been reached. |

木蟲 (著名寫手)
新蟲 (初入文壇)

新蟲 (小有名氣)
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樓主我問個問題,像力 Forces acting on atoms (Ry/au): atom 1 type 1 force = 0.00000000 0.00000000 0.00000000 atom 2 type 2 force = 0.00000000 0.00000000 0.00000000 這怎么解釋,為啥是三個值,還有怎么檢查各個原子上的力,下面是我計算relax結(jié)果的力這個具體是什么意思啊 3個值 Forces acting on atoms (au): Ti -0.602690E-03 0.299794E-02 -0.103070E+00 Ti 0.114534E-02 -0.280239E-02 -0.235120E-01 Ti 0.154898E-02 0.768104E-02 0.230297E-01 Ti -0.305820E-02 -0.297500E-02 0.888280E-01 |
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