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chdx0618木蟲 (小有名氣)
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【求助】CASTEP模塊幾何優(yōu)化失敗,求解決方案。失敗原因詳見本帖內(nèi)容 已有14人參與
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CASTEP模塊幾何優(yōu)化失敗,求解決方案。失敗原因如下: *Warning* max. SCF cycles performed but system has not reached the groundstate. Current total energy, E = -5466.593402796 eV Current free energy (E-TS) = -5466.679640124 eV (energies not corrected for finite basis set) NB est. 0K energy (E-0.5TS) = -5466.636521460 eV ******************************************************** Warning: electronic minimisation did not converge during finite basis set correction. ******************************************************** Checkpoint file cannot be written. Error calculate_finite_basis : Convergence failed when doing finite basis set correction. Current trace stack: calculate_finite_basis_corr check_elec_ground_state castep 降低精度后: Error in calculate_finite_basis: previous calculation had total energy = -33482.98282286 eV and this calculation has total energy = -33477.62803476 eV => something has gone seriously wrong with minimiser Checkpoint file cannot be written. Error in calculate_finite_basis: total energies are not variational - aborting Current trace stack: calculate_finite_basis_corr check_elec_ground_state castep [ Last edited by chdx0618 on 2011-3-24 at 09:27 ] |
第一原理資料匯編 | 我的饕餮 | 第一性原理計(jì)算 |
木蟲 (正式寫手)
木蟲 (正式寫手)
現(xiàn)在的問題應(yīng)該是:雖然收斂了,但是由于精度低,在進(jìn)行finite_basis修正的時(shí)候Ecut的改變導(dǎo)致能量變化過大,軟件判定出現(xiàn)了問題 (當(dāng)然有問題了: 精度過低)。不過好消息是收斂了,這也是當(dāng)初選擇降低精度的目的。![]() 你現(xiàn)在可以考慮不管finite_basis修正而僅僅考慮低精度的scf計(jì)算,利用低精度得到的電子密度作為初試值再進(jìn)行高精度的計(jì)算(castep應(yīng)該有這個(gè)功能吧,你可以在help查一下restart calculation等關(guān)鍵詞),這樣可能有助于高精度計(jì)算時(shí)候的收斂。 |
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木蟲 (小有名氣)
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木蟲 (小有名氣)
木蟲 (小有名氣)
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