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[求助]
摻雜后的結構計算彈性常數出現問題(急),請大家一定要幫幫忙啊~~
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我有兩個問題,想問一下大家, 1.我在計算彈性常數的時候計算出來的cij-1-2.castep這種文件中都是收斂的,但老是出現這樣的提醒 ,這是怎么回事。 *** There were at least 4 warnings during this run *** *** => please check the whole of this file carefully! *** 2.如果cij-1-2.castep這類文件中不收斂,是怎么回事,是不是要重新計算。 |
Better Man |
用戶注銷 (正式寫手)
用戶注銷 (正式寫手)
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BFGS: Warning - trial step suggests complex energy landscape in which simple line minimization will fail. - This is usually an indication that the forces/streses are not accurate enough. Consider making the following changes: 1) Increase cutoff_energy or basis_precision 2) Reduce elec_energy_tol and/or elec_force_tol 3) Increase grid_scale 4) Increase fine_grid_scale - Proceeding with a bisection search to find root instead. BFGS: Warning - Repeated consecutive reset of inverse Hessian BFGS: without satisfying convergence criteria which BFGS: looks like BFGS has run out of search directions. BFGS: Warning - Lets try allowing some uphill steps and see if BFGS: we can get around this barrier. BFGS: Warning - It is possible that the system may now converge to BFGS: a stationary point OTHER than the desired minimum. BFGS: Hint - this may be an indication that either: BFGS: a) you are using a poor guess at geom_frequency_est BFGS: and/or geom_modulus_est, or BFGS: b) you are using unrealistic convergence criteria. BFGS: Suggest therefore that you consider changing them! 總是出現這樣的警告,這是什么意思,怎么解決 |
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