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jinhuan123
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aylayl08(½ð±Ò+1,VIP+0):ллÄãµÄ½â´ð£¬»¶Ó½»Á÷ 10-16 08:38
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2Â¥2009-10-16 08:26:43
wuchenwf
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aylayl08(½ð±Ò+1,VIP+0):thank you very much 10-16 08:47
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aylayl08(½ð±Ò+1,VIP+0):thank you very much 10-16 08:47
°®Ï§»¨²Ý(½ð±Ò+1,VIP+0): 10-16 10:07
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3Â¥2009-10-16 08:46:31
linggang87
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4Â¥2009-10-16 08:51:47
cenwanglai
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5Â¥2009-10-16 09:14:44
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6Â¥2009-10-16 10:11:18
nkleof
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°®Ï§»¨²Ý(½ð±Ò+1,VIP+0): 10-17 10:14
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ÉèÖÃIBRION=2µÄʱºò£¬¿ÉÒÔ²»ÓÃÉèÖÃPOTIM£¬ÓÃvaspµÄĬÈÏÖµ£¬Ëü»áÔÚÓÅ»¯½áÊøºóµÄÈÎÎñ±¨¸æÖиø³öÒ»¸öºÏÊʵÄtrialstep£¨ÔÚÈÎÎñ±¨¸æµÄ×îÄ©£©£¬ÏÂÒ»´ÎÓÃIBRION=1ÓÅ»¯µÄʱºò¾Í¿ÉÒÔ²ÉÓÃÕâ¸ötrialstep*0.5×÷ΪPOTIMµÄÖµ¡£ÔÚvaspµÄ˵Ã÷ÖÐÓнéÉÜ¡£ http://cms.mpi.univie.ac.at/vasp/vasp/node115.html Within all relaxation algorithms ( IBRION=1,2 and 3) the parameter POTIM should be supplied in the INCAR file. For IBRION$>$0, the forces are scaled internally before calling the minimization routine. Therefore for relaxations, POTIM has no physical meaning and serves only as a scaling factor. For many systems, the optimal POTIM is around 0.5. Because the Quasi-Newton algorithm and the damped algorithms are sensitive to the choice of this parameter, use IBRION=2, if you are not sure how large the optimal POTIM is. In this case, the OUTCAR file and stdout will contain a line indicating a reliable POTIM. For IBRION=2, the following lines will be written to stdout after each corrector step (usually each odd step): trial: gam= .00000 g(F)= .152E+01 g(S)= .000E+00 ort = .000E+00 (trialstep = .82) The quantity gam is the conjugation parameter to the previous step, g(F) and g(S) are the norm of the force respectively the norm of the stress tensor. The quantity ort is an indicator whether this search direction is orthogonal to the last search direction (for an optimal step this quantity should be much smaller than ( g(F) + g(S)). The quantity trialstep is the size of the current trialstep. This value is the average step size leading to a line minimization in the previous ionic step. An optimal POTIM can be determined, by multiplying the current POTIM with the quantity trialstep. [ Last edited by nkleof on 2009-10-16 at 10:33 ] |
7Â¥2009-10-16 10:31:20
wuchenwf
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8Â¥2009-10-16 20:03:34













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